CN210572953U - Lens barrel module - Google Patents

Abstract

Provided is a lens barrel module which has high quality and accurately performs the position alignment of lenses by selecting an appropriate lens after grasping the characteristics of the lenses produced in the manufacturing process. The lens barrel module (20) is provided with at least a cylindrical lens barrel (50), a first lens (41) disposed inside the lens barrel (50), and a second lens (42) disposed inside the lens barrel (50) so as to overlap with the first lens (41). An imaging element (60) for imaging light transmitted through the first lens (41) and the second lens (42) is arranged so as to overlap the first lens (41) and the second lens (42). The second lens (42) is disposed between the first lens (41) and the imaging element (60), is made of a light-transmitting resin, and is substantially circular in plan view, and the circular edge of the second lens (42) has a mark disposed in a region of the second lens (42) other than the region through which light passes.

Description

Lens barrel module

Technical Field

The present disclosure relates to a lens barrel module.

Background

In recent years, from the viewpoint of cost reduction and the like, it has been proposed to mold a lens used in a video camera or the like with a resin instead of glass. Patent document 1 discloses a lens (injection-molded article) molded in a sequential manner by detecting a resin injected into a cavity from a first gate by a sensor and then injecting the resin from a second gate. In the lens, a sensor mark is formed at a position in the back surface of the lens that overlaps with a gate mark formed by each gate in the surface direction. The sensor mark is overlapped with the gate mark, and thus is not observed from the outside, thereby preventing the aesthetic deterioration in appearance.

Patent document 1: japanese laid-open patent publication No. 2015-47858

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

Such a resin-made lens is generally formed using a mold, but in many cases, the accuracy of molding of each mold varies, and improvement of the accuracy of the lens becomes an important issue. In particular, when a module in which a plurality of lenses are combined is used, the accuracy of the module depends not only on the accuracy of each lens but also largely on the characteristics of each lens and the accuracy of positional alignment.

The present disclosure is a technique related to quality improvement of a lens barrel module having a lens made of resin.

Means for solving the problems

The lens barrel module of the present disclosure includes at least: a cylindrical lens barrel; a first lens disposed inside the lens barrel; and a second lens disposed inside the lens barrel so as to overlap the first lens, wherein an image pickup device that picks up an image based on light transmitted through the first lens and the second lens is disposed in the lens barrel module so as to overlap the first lens and the second lens, the second lens is disposed between the first lens and the image pickup device, is made of a light-transmitting resin, and has a substantially circular shape in a plan view, and a circular edge portion of the second lens has a mark disposed in a region other than a region through which the light is transmitted in the second lens.

Preferably, the mark is a mark obtained by laminating ink on the second lens.

Preferably, the mark reflects ultraviolet light at a predetermined ratio or more.

Preferably, the tag has a wireless communication function.

The lens barrel module of the present disclosure includes at least: a cylindrical lens barrel; a first lens disposed inside the lens barrel; a second lens disposed inside the lens barrel so as to overlap the first lens; and an imaging element that is disposed so as to overlap the first lens and the second lens, and that performs imaging based on light transmitted through the first lens and the second lens, wherein the second lens is disposed between the first lens and the imaging element, is made of a translucent resin, and has a substantially circular shape in a plan view, and a circular edge portion of the second lens has a mark disposed in a region other than a region through which the light is transmitted in the second lens.

Preferably, the second lens is formed by injection molding, and the mark is not a gate mark of the injection molding.

Preferably, the mark gives information on a relative position to the gate mark.

Preferably, the mark is a mark obtained by cutting off the circular shape in a chord-like manner.

Preferably, the second lens has a first surface and a second surface opposite to the first surface, the light passes through the first surface and the second surface, and the mark is a concave portion provided at least on the first surface.

Preferably, the recess provided in the first surface penetrates through the second surface.

Preferably, the mark is at least two recesses provided in the first surface.

Preferably, the flag has at least 2 bits of information.

Preferably, the 2 bits of information indicate through which cavity the second lens is molded in a mold for injection molding of the second lens.

Preferably, the projector further includes a third lens disposed at a position opposite to the second lens with respect to the first lens, and the light passes through the third lens.

Preferably, the image pickup device further includes a fourth lens, the fourth lens being disposed between the second lens and the image pickup element, and the light being transmitted through the fourth lens.

Preferably, the lens barrel module has an optical axis passing through at least the first lens, the second lens, and the image pickup device, and the second lens is rotatable around the optical axis.

Preferably, the second lens is relatively rotatable with respect to the first lens around the optical axis.

Preferably, the second lens is rotated around the optical axis when the lens barrel module is assembled.

Effect of the utility model

At least a specific lens made of resin among the plurality of lenses of the lens barrel module of the present disclosure has a mark and performs the positional alignment of the lens based on the mark, whereby the accuracy of the positional alignment of the lens is improved, and as a result, a high-quality lens barrel module and a high-quality camera can be provided at low cost.

Drawings

Fig. 1 is a view showing an example of a vehicle using the lens barrel module of the present disclosure, where (a) is a side view and (b) is a rear view.

Fig. 2 is an enlarged view of a camera provided in the vehicle of fig. 1.

Fig. 3 is a sectional view of a mold for manufacturing a lens of the lens barrel module according to the present embodiment.

Fig. 4 (a) to (d) are plan views of lenses manufactured by using the mold of fig. 3.

Fig. 5 (a) to (c) are plan views of modified examples of the lens.

Fig. 6 is a plan view of the mounting table on which the lens is mounted before being assembled to the lens barrel.

Fig. 7 is a plan view of another modification of the lens, (a) is an example in which ink is laminated, (b) is an example in which a UV reflective film is laminated, and (c) is an example in which an RFID is provided.

Description of the reference numerals

1: a vehicle; 2: a vehicle body; 3: a wheel; 4: a bottom surface; 5: a top cover; 6: a side view mirror; 7: a license plate; 11: a camera; 20: a lens barrel module; 30: a connecting portion; 31: a substrate; 32: a cable (flexible substrate); 40: a lens; 41: a first lens; 42: a second lens; 43: a third lens; 44: a fourth lens; 50: a lens barrel; 51: a spacer; 52: a spacer; 53: a base; 60: an image pickup element; 100: a mold; 110: a placing table.

Detailed Description

Hereinafter, embodiments (hereinafter referred to as "the present embodiment") specifically disclosing the lens barrel module according to the present disclosure will be described in detail with reference to the drawings as appropriate. However, unnecessary detailed description may be omitted. For example, a detailed description of already known items and a repetitive description of substantially the same configuration may be omitted. This is to avoid over-verbose explanation below and to facilitate understanding by those skilled in the art. Furthermore, the attached drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter recited in the claims by these.

Preferred embodiments for carrying out the present disclosure will be described in detail below with reference to the accompanying drawings.

Fig. 1 (a) is a side view of a vehicle 1 having the lens barrel module of the present disclosure, and fig. 1 (b) is a rear view of the vehicle 1. The X, Y, and Z axes shown in fig. 1 are schematic diagrams collectively showing the directions and orientations in the respective drawings. In fig. 1 (a), the arrow on the X axis indicates that the arrow on the Z axis indicates that the arrow on the X axis is directed from negative to positive, and the arrow on the X axis likewise indicates that the arrow on the Z axis is directed from negative to positive. The arrows on the respective axes are also the same in the following drawings.

In fig. 1 (a), a circle of the Y axis and an intersection (x) in the circle indicate that the Y axis is along the vertical direction of the sheet and from the front side of the sheet toward the rear side of the sheet. In this case, the front side of the sheet is negative and the rear side of the sheet is positive with respect to the Y axis. The circles of the respective axes and the crosses (x) in the circles are also the same in the following figures.

The positive and negative of each axis are only as defined above, and do not have technical significance. The concept is used only for the purpose of uniformly explaining the orientation. This situation is also the same in the following figures.

The vehicle 1 includes: a vehicle body 2; a wheel 3 disposed on the vehicle body 2 along a predetermined one direction (X direction in the drawing); a bottom surface 4 which can be opposed to the ground; and a roof panel 5 disposed opposite to the bottom panel 4, wherein side view mirrors 6 are attached to both sides of the vehicle body 2, and license plates 7 are attached to the front and rear of the vehicle body 2. The vehicle 1 is a divided automobile by the road transport vehicle law, and in the embodiment, a car is taken as an example. Here, the X direction corresponding to a predetermined one direction may be a positive direction of the X axis (a direction from negative to positive).

As shown in fig. 1 (b), in the embodiment, a camera 11 is disposed on the side of the license plate 7. The camera 11 has a predetermined angle of view and captures an image in a predetermined direction, i.e., the X direction, and particularly, in this example, captures an image in a direction from the positive side to the negative side, i.e., the rear side of the vehicle 1, in the direction along the X axis, which is opposite to the arrow direction of the X axis in fig. 1 (a). The acquired image is reflected on a monitor (not shown) provided in the cabin of the vehicle 1, for example, and the occupant can see the image behind.

Fig. 2 shows an enlarged view of the camera 11, and particularly, a view for explaining the lens barrel module of the present disclosure used in the camera 11. In this example, the camera 11 is mounted to the body 2 after being assembled as a module. The camera 11 includes: a lens barrel module 20 that performs the main functions of light imaging and photographing; and a connection portion 30 for ensuring mechanical and electrical connection to the vehicle body 2.

The lens barrel module 20 includes a cylindrical lens barrel 50 and a plurality of lenses arranged inside the lens barrel 50. Here, the camera 11 is provided with an image pickup device 60, and the image pickup device 60 performs image pickup based on light coming from the outside (downward in fig. 2) and transmitted through the plurality of lenses. The lens barrel module 20A shown in fig. 2 is defined as a module that does not include this image pickup element 60. On the other hand, the lens barrel module 20B is defined as a module including the image pickup element 60. That is, the lens barrel module 20 also refers to any one of a module including the image pickup element 60 and a module not including the image pickup element 60.

The plurality of lenses in the barrel module 20 of the present embodiment includes a first lens 41, a second lens 42, a third lens 43, and a fourth lens 44 that are arranged to overlap each other in the axial direction (optical axis direction) of the barrel 50. These lenses are coaxially arranged in order of the third lens 43, the first lens 41, the second lens 42, and the fourth lens 44 from the outside of the camera 11, and are fixed to the inside of the hollow cylindrical lens barrel 50. Preferably, the optical axis a of the incident light passes through the center of each lens and the imaging element 60. Each lens is used for imaging an object present at a different distance from each other, and each lens cooperates with each other to form an accurate image on the image pickup device 60, so that the image pickup device 60 can pick up an excellent image.

In the present embodiment, the third lens 43 disposed at a position opposite to the second lens 42 with respect to the first lens 41 is disposed at the outermost side. The light incident on the third lens 43 from the outside passes through the third lens 43 and then enters the first lens 41. The light transmitted through the first lens 41 enters the second lens 42 disposed on the rear side. The light transmitted through the second lens 42 enters the fourth lens 44 disposed between the second lens 42 and the image pickup device 60. The light transmitted through the fourth lens 44 enters the image pickup device 60, and the image pickup device 60 generates an image by light pickup. The image sensor 60 is formed of a device such as a CCD (Charge coupled device) or a CMOS (Complementary Metal-Oxide-Semiconductor), but the type thereof is not particularly limited.

A cylindrical lens barrel 50 forming the outer shape of the lens barrel module 20 is fixed to a base 53. The lens barrel 50 and the base 53 are formed of, for example, resin, ceramics, or the like, but the type of material is not particularly limited. An imaging element 60 is fixed to a surface of the flat plate-shaped base 53 on which the lens barrel 50 is fixed, and the connecting portion 30 is disposed on the opposite surface. The connection unit 30 includes a substrate 31 and a cable 32, and exchanges electric power and signals between the substrate 31 and the vehicle body 2 via the cable 32. The image signal generated by the imaging device 60 is transmitted to the vehicle body 2 via the substrate 31 and the cable 32, and is processed by a predetermined processor or the like. Further, the cable 32 can be replaced with a flexible substrate.

The third lens 43 is fixed to the lens barrel 50 by sandwiching a flange 43a formed at an edge portion of the third lens 43 by a rib 50a formed so as to protrude from the inner side (inner wall) of the lens barrel 50. A spacer 51 is fixed to a region inside the lens barrel 50 and between the rib 50a and the flange 41a of the rim portion of the first lens 41, and the spacer 51 sandwiches the flange 41a of the first lens 41 in cooperation with the side wall 42a of the rim portion of the second lens 42 to fix the first lens 41. Similarly, a spacer 52 is fixed to a region inside the lens barrel 50 and between the side wall 42a of the second lens 42 and the base 53. The fourth lens 44 is fixed to the inside of the spacer 52 by an adhesive or the like.

The third lens 43 is a convex lens, and the flange 43a formed on the edge portion so as to protrude outward as described above is fitted into the rib 50a of the lens barrel 50. The first lens 41 is also a convex lens, and a flange 41a formed to protrude at an edge portion is sandwiched and fixed between the spacer 51 and the side wall 42a of the second lens 42. The second lens 42 is a concave lens, and a side wall 42a extending in the thickness direction of the lens is formed at an edge portion, and the side wall 42a is attached to the inner side (inner wall) of the lens barrel 50. The fourth lens 44 is a convex lens, and the edge portion is fixed to the spacer 52. The four lenses are substantially circular in a plan view viewed from the X-axis direction.

The four lenses are formed with predetermined processing accuracy, and the four lenses cooperate with each other to capture an excellent image. Therefore, it is important: not only each lens has excellent processing accuracy, but also characteristics of the lens that can be produced in the manufacturing process are grasped, and are arranged at relatively precise positions. That is, in order to improve the performance of the camera 11, selection of a lens and positional alignment of the lens in the manufacturing process become important factors.

Therefore, in the present embodiment, at least one of the four lenses has a predetermined mark at a substantially circular edge portion in a plan view. The mark is disposed at the edge of the lens and in a region other than the region through which light is transmitted, and does not interfere with the transmission of light. In fig. 2, the outer edge of the light that reaches the image sensor 60 after passing through the first lens 41, the second lens 42, and the fourth lens 44 from the third lens 43 is schematically shown by a broken line. If the lenses have such marks, the lenses can be selected after grasping the characteristics of the respective lenses that can be produced in the manufacturing process, and assembled into the lens barrel 50 in a state of being accurately aligned, so that the lens barrel module 20 and the camera 11 of high quality can be manufactured.

In the present embodiment, such a mark for alignment is formed on the second lens 42 made of a resin having light transmittance. The mark is formed on a side wall as an edge portion of the second lens 42, for example. The side wall is a region other than the region through which light passes. The resin having light transmittance includes acrylic resin and the like, and the kind of the resin is not particularly limited.

When a plurality of lenses are used, it is preferable to add such a mark to a lens disposed at a position closer to the center among the lenses arranged along the traveling direction of light, from the viewpoint of improving accuracy. In the present embodiment, it is preferable to provide the mark on the first lens 41 or the second lens 42, but it is preferable to provide the mark on the second lens 42 in the vicinity of the image sensor 60. In the case where only two lenses are arranged so as to overlap each other, as in the case of the first lens 41 and the second lens 42, a mark is provided at least in the second lens 42 near the image pickup device 60.

Since at least one lens disposed near the center in the traveling direction of light has such a mark for alignment, at least the lens can be aligned with high accuracy, and therefore, the accuracy of the lens barrel module 20 and the camera 11 can be expected to be improved. It is of course also possible to form marks in more than two, or all, of the lenses. In this case, since the positional alignment of all the lenses can be performed with high accuracy, further improvement in accuracy can be expected.

Fig. 3 is a sectional view of a mold 100 for manufacturing a resin lens of the lens barrel module 20 according to the present embodiment, and fig. 4 is a plan view of a lens 40 molded by the mold 100. The lens 40 shown in fig. 3 includes the shapes of the first lens 41, the second lens 42, the third lens 43, and the fourth lens 44 in fig. 2, and thus is shown with the flange and the side wall omitted from illustration. Of course, a flange or a side wall may be present at the edge portion. In the case where the second lens 42 has a mark as in the embodiment of fig. 2, the second lens 42 is formed by injection molding using the mold 100, and therefore in the following description, "lens 40" can be replaced with "second lens 42".

The mold 100 includes a central passage 101 into which molten resin flows from upstream, a branch passage 102 for flowing the resin from the central passage 101 in the direction of the arrow, and four cavities 103a, 103b, 103c, 103d into which the resin flows from the branch passage 102, the four cavities 103a, 103b, 103c, 103 d. The cavities 103a, 103b, 103c, and 103d are each substantially circular in plan view, and are provided with ribs 104a, 104b, 104c, and 104d so as to be cut off in a chord-like manner in a circle forming a space.

Fig. 4 (a) shows a lens 40a molded by a cavity 103a, fig. 4 (b) shows a lens 40b molded by a cavity 103b, fig. 4 (c) shows a lens 40c molded by a cavity 103c, and fig. 4 (d) shows a lens 40d molded by a cavity 103 d. The mark M1 is a mark of a gate mark formed as a result of the branch path 102 facing the gate of each cavity.

The mark M2 is a mark of a chord formed by the ribs 104a, 104b, 104c, 104d, is cut off in a chord-like manner in a circle, and is not a gate mark of injection molding. In each cavity 103a, 103b, 103c, 103d, the relative positions of the ribs 104a, 104b, 104c, 104d with respect to the gate of the branch path 102 are different. Therefore, the relative position of the mark M2 with respect to the mark M1 differs among the lenses 40a, 40b, 40c, and 40d that are molded. This situation means that the relative position of marker M2 to marker M1 is made to have information. The two marks have 2 bits of information, and the 2 bits of information are information indicating through which cavity the lens 40 is molded in the mold 100 for injection molding.

In this example, 2 bits of information are given by a combination of a mark M1 that is a gate mark of injection molding and a mark M2 that is not a gate mark of injection molding. When the mold 100 is provided with a plurality of cavities for molding the same member (lens), it is difficult to obtain a member having completely the same characteristics from all the cavities from the viewpoints of the limitation of the improvement of the accuracy of the mold, the position of each cavity, the characteristics of the resin, and the like. However, the presence of the mark allows the user to know in advance which cavity 103a, 103b, 103c, 103d each lens 40a, 40b, 40c, 40d is molded in. That is, after the characteristics (shape, composition, etc.) of each lens that can be produced in the manufacturing process are grasped in advance, the performance of the lens barrel module 20 assembled by a prefabrication test or the like can be evaluated to select an appropriate lens. As a result, even if the manufacturing method is shifted to a mass production system, a high-quality lens barrel module and a high-quality camera can be manufactured.

In addition, for example, a fitting device (position alignment device) that assembles the lens to the lens barrel 50 based on information provided by the mark can accurately perform the position alignment of the lens, so that a high-quality lens barrel module, a video camera can be manufactured.

Fig. 5 shows another modification of the lens 40. In the example of fig. 5 (a), two markers M3 and M4 are provided. The lens 40 has a first surface on the front surface side of the sheet and a second surface (not shown) opposite to the first surface, and in the configuration in which light passes through the first surface and the second surface, the marks M3 and M4 are formed by recesses provided at least in the first surface. Such a concave portion can be formed by providing a convex portion in a cavity of a mold.

In the example of fig. 5 (a), since the mark is formed by at least two recesses provided on the first surface of the lens 40 and provides useful information of at least 2 bits as in the example of fig. 4, it is possible to distinguish which cavity the lens is molded in, and to perform position alignment based on the characteristics of each cavity in the mold 100 having four cavities, for example, and it is therefore possible to contribute to manufacturing a high-quality lens barrel module or camera. The marks M3 and M4 are not gate marks of injection molding.

In the example of fig. 5 (b), two markers M2 and M3(M4) are provided. The mark M2 is the same chord as the mark shown in fig. 4, and the mark M3(M4) is the same concavity as the mark shown in fig. 5. This example also provides at least 2 bits of useful information as in the example of fig. 4, and thus contributes to manufacturing high-quality lens barrel modules and cameras. The marks M2 and M3(M4) are not gate marks of injection molding.

In the example of fig. 5 (c), two markers M3(M4) and M5 are provided. The mark M3(M4) is the same recess as the mark shown in fig. 5. As shown in the sectional view, the mark M3(M4) is a concave portion having a bottom surface, and does not penetrate through the second surface. On the other hand, the mark M5 is a concave portion having no bottom portion and penetrating from the first surface to the second surface, and can be formed by providing a convex portion in the cavity, similarly to the mark M3 (M4). This example also provides at least 2 bits of useful information as in the example of fig. 4, and thus contributes to manufacturing high-quality lens barrel modules and cameras. The marks M3 and M5 are not gate marks of injection molding.

Fig. 6 is a plan view of the mounting table 110 on which the lens 40 is mounted before being assembled to the lens barrel. In this example, the lens 40 shown in fig. 5 (b) is placed in the concave portion 111 formed in the mounting table 110. Since the two marks M2, M3 provide useful at least 2 bits of information, the mounting apparatus can take out the lens 40 of which the characteristics are grasped in advance from the stage 110 and accurately assemble the lens 40 to the lens barrel 50.

Further, it is preferable to have the following structure: when at least two lenses, that is, the first lens 41 and the second lens 42 are provided, the second lens 42 to which a mark is added can be rotated about an optical axis a (fig. 2) passing through the first lens 41, the second lens 42, and the image pickup device 60. For example, the second lens 42 is preferably configured to be relatively rotatable with respect to the first lens 41 around the optical axis a. In particular, when the barrel module 20 is assembled, the second lens 42 is rotated about the optical axis a. By rotating the second lens 42 in this manner, the position of the second lens 42 can be finely adjusted, and more accurate position alignment can be performed. Of course, the lenses other than the second lens 42 may be configured to be capable of alignment by rotational adjustment.

Fig. 7 shows another modification of the lens 40. In the examples of fig. 4 and 5, the shape of the lens itself is deformed to add a mark, but in the example of fig. 7, another member is added to the lens. Fig. 7 (a) shows an example in which ink 45 is laminated as a mark. For example, by laminating the ink 45 on the second lens 42 using a stamp or the like, the mounting apparatus can capture the image of the ink 45 and grasp the characteristics and positions of the lens, and the same effects as those of the above-described marking can be obtained.

Fig. 7 (b) shows an example in which a UV (ultraviolet) reflective film 46 is laminated as a mark. The UV reflecting film 46 reflects the irradiated ultraviolet rays at a predetermined ratio or more. Therefore, for example, by laminating the reflective film 46 on the second lens 42, the mounting apparatus that irradiates ultraviolet rays can detect the UV reflective film 46 and grasp the characteristics and positions of the lenses, and the same effects as those of the above-described marks can be obtained.

Fig. 7 (c) shows an example in which an RFID (Radio Frequency Identification) 47 is provided as a tag. For example, by providing the RFID 47 such as a wireless tag having a wireless communication function on the second lens 42, the mounting apparatus can receive radio waves from the RFID 47 to grasp the characteristics and the position of the lens, and the same effect as the above-described marker can be obtained. The type of the mark is not limited to the exemplified mark as long as the above-described function can be provided to the lens.

In the embodiment of fig. 2, the number of lenses is 4, but the number of lenses may be 2, 3, or 5 or more. The shape of each lens is also arbitrary, and not only the convex lens and the concave lens in fig. 2, but also a spherical lens, an aspherical lens, a free-form surface lens, and the like may be used.

As described above, in the lens barrel module according to the present disclosure, in the configuration in which at least two lenses are provided, the second lens provided at a position closer to the image pickup device than the first lens is made of a resin having translucency, and the mark is provided at the edge portion. Therefore, at least with respect to the second lens, an appropriate lens is selected in consideration of characteristics generated in the manufacturing process, and since the accuracy of the positional alignment is also improved, it is possible to provide a high-quality lens barrel module and camera at low cost as a result. Further, since the lens is made of an inexpensive resin, the mark can be easily added, and thus the manufacturing cost can be reduced. The "first lens" and "second lens" herein do not mean the first lens 41 and the second lens 42 themselves in the embodiment of fig. 2, but mean lenses determined from the relationship of the relative positions with respect to the image pickup device when two lenses are provided.

In particular, an on-vehicle camera mounted on the vehicle 1 such as the camera 11 is required to have higher image quality and higher accuracy of position information recognition to perform position recognition and object recognition of an object, and it is essential to improve the performance and quality of the camera. The lens barrel module of the present disclosure can respond to such a requirement.

The embodiments of the lens barrel module according to the present disclosure have been described above with reference to the drawings, but the present disclosure is not limited to the examples. It is obvious that those skilled in the art can conceive various modifications, alternatives, additions, deletions, and equivalents within the scope of the claims, and understand that they also fall within the scope of the present disclosure.

Industrial applicability

The lens barrel module according to the present disclosure can be applied to the field of providing a high-quality lens barrel module at low cost, and thus providing a video camera.

Claims (31)

1. A lens barrel module at least comprises:

a cylindrical lens barrel;

a first lens disposed inside the lens barrel; and

a second lens disposed inside the lens barrel so as to overlap the first lens,

wherein an image pickup element that picks up an image based on light transmitted through the first lens and the second lens is disposed on the barrel module so as to overlap the first lens and the second lens,

the lens barrel module is characterized in that,

the second lens is arranged between the first lens and the image pickup element, is made of a light-transmitting resin, and has a substantially circular shape in a plan view,

the circular edge portion of the second lens has a mark,

the mark is disposed in a region of the second lens other than a region through which the light passes.

2. The lens barrel module according to claim 1,

the second lens is formed by injection molding,

the mark is not a gate mark of the injection molding.

3. The lens barrel module according to claim 2,

the mark gives information on the relative position to the gate mark.

4. The lens barrel module according to any one of claims 1 to 3,

the mark is obtained by cutting off the circular shape in a chord-like manner.

5. The lens barrel module according to any one of claims 1 to 3,

the second lens has a first face and a second face opposite the first face,

the light passes through the first face and the second face,

the mark is a recess provided at least on the first surface.

6. The lens barrel module according to claim 5,

the recess provided in the first surface penetrates through the second surface.

7. The lens barrel module according to claim 5,

the marks are at least two recesses provided in the first surface.

8. The lens barrel module according to any one of claims 1 to 3,

the flag has at least 2 bits of information.

9. The lens barrel module according to claim 8,

the 2 bits of information indicate through which cavity is molded in a mold for performing injection molding of the second lens.

10. The lens barrel module according to any one of claims 1 to 3,

the lens is further provided with a third lens,

the third lens is disposed at a position opposite to the second lens with reference to the first lens,

the light is transmitted through the third lens.

11. The lens barrel module according to any one of claims 1 to 3,

the lens is further provided with a fourth lens,

the fourth lens is disposed between the second lens and the image pickup element,

the light is transmitted through the fourth lens.

12. The lens barrel module according to any one of claims 1 to 3,

the lens barrel module has an optical axis passing through at least the first lens, the second lens, and the image pickup element,

the second lens is rotatable around the optical axis.

13. The lens barrel module according to claim 12,

the second lens can relatively rotate with respect to the first lens with the optical axis as a center.

14. The lens barrel module according to claim 12,

when the lens barrel module is assembled, the second lens is rotated around the optical axis.

15. The lens barrel module according to claim 1,

the mark is obtained by laminating ink on the second lens.

16. The lens barrel module according to claim 1,

the mark reflects ultraviolet rays at a predetermined ratio or more.

17. The lens barrel module according to claim 1,

the tag has wireless communication capabilities.

18. A lens barrel module at least comprises:

a cylindrical lens barrel;

a first lens disposed inside the lens barrel;

a second lens disposed inside the lens barrel so as to overlap the first lens; and

an imaging element that is disposed so as to overlap the first lens and the second lens and performs imaging based on light transmitted through the first lens and the second lens,

the lens barrel module is characterized in that,

the second lens is arranged between the first lens and the image pickup element, is made of a light-transmitting resin, and has a substantially circular shape in a plan view,

the circular edge portion of the second lens has a mark,

the mark is disposed in a region of the second lens other than a region through which the light passes.

19. The lens barrel module according to claim 18,

the second lens is formed by injection molding,

the mark is not a gate mark of the injection molding.

20. The lens barrel module according to claim 19,

the mark gives information on the relative position to the gate mark.

21. The lens barrel module according to any one of claims 18 to 20,

the mark is obtained by cutting off the circular shape in a chord-like manner.

22. The lens barrel module according to any one of claims 18 to 20,

the second lens has a first face and a second face opposite the first face,

the light passes through the first face and the second face,

the mark is a recess provided at least on the first surface.

23. The lens barrel module according to claim 22,

the recess provided in the first surface penetrates through the second surface.

24. The lens barrel module according to claim 22,

the marks are at least two recesses provided in the first surface.

25. The lens barrel module according to any one of claims 18 to 20,

the flag has at least 2 bits of information.

26. The lens barrel module according to claim 25,

the 2 bits of information indicate through which cavity is molded in a mold for performing injection molding of the second lens.

27. The lens barrel module according to any one of claims 18 to 20,

the lens is further provided with a third lens,

the third lens is disposed at a position opposite to the second lens with reference to the first lens,

the light is transmitted through the third lens.

28. The lens barrel module according to any one of claims 18 to 20,

the lens is further provided with a fourth lens,

the fourth lens is disposed between the second lens and the image pickup element,

the light is transmitted through the fourth lens.

29. The lens barrel module according to any one of claims 18 to 20,

the lens barrel module has an optical axis passing through at least the first lens, the second lens, and the image pickup element,

the second lens is rotatable around the optical axis.

30. The lens barrel module according to claim 29,

the second lens can relatively rotate with respect to the first lens with the optical axis as a center.

31. The lens barrel module according to claim 29,

when the lens barrel module is assembled, the second lens is rotated around the optical axis.

Images