Lens barrel and imaging apparatus including the same

Abstract

To provide a lens barrel capable of achieving both of sealing an optical system for the purpose of defogging and energizing a lens, while suppressing reduction in optical performance.SOLUTION: The lens barrel includes: a first fixing member and a second fixing member which are fixed to each other; a lens which is arranged inside the first fixing member; and an elastic member which is arranged between the first fixing member and the second fixing member in an optical axis direction. The elastic member is arranged between the second fixing member and the lens and has a first area for energizing the lens and a second area where the whole circumference is held between the first fixing member and the second fixing member. A surface for energizing the lens of the first area is different from a surface for energizing the first fixing member of the second area.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a lens barrel and an imaging device having the same. [Background technology]

[0002] Conventionally, cameras have been known to have a configuration in which a single elastic member seals multiple locations. Patent Document 1 discloses a configuration in which waterproofing and dustproofing are ensured using a sealing member with multiple protrusions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-206270 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for EVF (Electronic Viewfinder) units with optical plastic lenses to use a single elastic member to hold the lens and seal it against fogging (preventing condensation inside the lens). The configuration of Patent Document 1 is based on the use of a screw-in type lens holding frame and is intended to ensure sealing. Therefore, when the configuration of Patent Document 1 is applied to an EVF unit, it is difficult to hold the lens and seal it against fogging while suppressing deformation of the optical plastic lens.

[0005] An object of the present invention is to provide a lens barrel that can simultaneously seal the optical system to prevent fogging and bias the lens while suppressing degradation of optical performance. [Means for solving the problem]

[0006] A lens barrel according to one aspect of the present invention comprises a first fixed member and a second fixed member fixed to each other, a lens disposed inside the first fixed member, and an elastic member disposed between the first fixed member and the second fixed member in the optical axis direction, the elastic member comprising a first region disposed between the second fixed member and the lens and biasing the lens, and a second region whose entire circumference is sandwiched between the first fixed member and the second fixed member, and characterized in that the surface of the first region biasing the lens is a different surface from the surface of the second region biasing the first fixed member. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a lens barrel that can simultaneously seal the optical system for the purpose of preventing fogging and bias the lens while suppressing degradation of optical performance. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram of a camera body equipped with a lens barrel according to a first embodiment. [Figure 2] FIG. 2 is an explanatory diagram of a lens barrel according to the first embodiment. [Figure 3] FIG. 2(b) is a cross-sectional view taken along line AA in FIG. [Figure 4] FIG. 2 is an explanatory diagram of a lens holder according to the first embodiment. [Figure 5] FIG. 10 is an explanatory diagram of a lens barrel according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same components, and redundant explanations will be omitted. (First embodiment) FIG. 1 is a schematic diagram of a camera body (imaging device) 500 equipped with a lens barrel 100 according to this embodiment. The camera body 500 is an interchangeable lens single-lens camera, or a so-called mirrorless camera. A photographing lens 503 for forming an image of a subject is connected to the camera body 500 via a camera mount 502. Light rays incident through the photographing lens 503 are guided to an imaging sensor (imaging element) 501 made up of a CMOS sensor disposed inside the camera body 500. The image of the subject is photoelectrically converted by the imaging sensor 501 and input to a CPU 504. The information input to the CPU 504 is processed by an appropriate program and output to an EVF (Electronic Viewfinder) unit (observation device) 510, where it is presented to the user as a display image.

[0010] EVF unit 510 is made up of a panel unit 513, a lens barrel 100 including a lens holder (first fixing member) 110, a lens cover (second fixing member) 120, and an optical lens 200, and a diopter adjustment unit 514.

[0011] The panel unit 513 is attached to the objective lens (G1 lens) side and is made up of an EVF panel 511 and an EVF panel holder 512 that holds the EVF panel 511. The EVF panel 511 converts image information from the CPU 504 into a display image and is made up of, for example, an organic EL panel or a backlit liquid crystal panel.

[0012] The diopter adjustment unit 514 adjusts the diopter by changing the relative distance between the EVF panel holder 512 and the lens barrel 100 through user operation to adjust the diopter to the user's visual acuity. While details of the moving mechanism are omitted, it is generally configured with a mechanism that changes the relative position using an operating unit such as a dial or slider and a cam. In this embodiment, the diopter adjustment unit 514 moves the panel unit 513 relative to the lens barrel 100 fixed to the camera body 500. To prevent fogging of the lens barrel 100, it is preferable to provide a sealed configuration on the eyepiece (G5 lens), which is most susceptible to fogging. Therefore, in this embodiment, it is easy to design a diopter adjustment configuration in which the lens barrel 100, which has a sealed structure, is fixed and the panel unit 513 is moved. However, the configuration of the diopter adjustment unit 514 is not limited to this, and a configuration in which the lens barrel 100 is moved relative to the fixed panel unit 513 may also be used.

[0013] Lens barrel 100 holds optical lens 200, which forms the image displayed on EVF panel 511 into an image visible to the user. In this embodiment, a G1 lens 210, G2 lens 220, G3 lens 230, G4 lens 240, and G5 lens 250, which are arranged in this order from the EVF panel 511 side to the user side, are collectively referred to as optical lens 200. G1 lens 210 is an objective lens, and G5 lens 250 is an eyepiece lens.

[0014] The EVF unit 510 is designed for use in both low-temperature and high-temperature environments, and must have high anti-fogging capabilities. For example, if the camera body 500 is in a warm environment and the user-facing lens surface 256 of the G5 lens 250 comes into contact with cold outside air due to a sudden change in environment, the entire G5 lens 250 will cool. As a result, the warm internal air 101 of the lens barrel 100 will locally fall below the dew point near the lens surface 255 of the cooled G5 lens 250 facing the EVF panel 511, causing the contained water vapor to condense.

[0015] As a countermeasure against condensation in the EVF unit 510, it is effective to seal the inside of the lens barrel 100 to contain the internal air 101 and prevent water vapor from entering from outside the lens barrel 100. For this reason, in this embodiment, the lens holder 110 is sealed with a G1 lens sealing seal 115, and the lens cover 120 is sealed with a G5 lens sealing seal 128. In addition, the space between the lens holder 110 and the lens cover 120 is sealed with a lens barrel packing (elastic member) 130.

[0016] Note that methods for suppressing condensation on the lens surface 255 of the G5 lens 250 are not limited to confining the internal air 101. For example, there is also a method of suppressing a temperature drop on the lens surface 255 due to a drop in outside air temperature by increasing the thermal capacity of the G5 lens 250. Another method is to place a moisture-absorbing material in the area of ​​the internal air 101. Note that there is also a method of completely exchanging the internal air 101 with outside air to prevent a temperature difference between the inside and outside of the camera body 500, but this is not desirable if the camera body 500 is required to have dust-proof and water-resistant performance. Therefore, considering the intended use of the camera body 500, isolating the internal air 101 from the outside air and configuring the lens barrel 100 in a sealed configuration is suitable for suppressing condensation and improving anti-fogging performance.

[0017] Figure 2 is an explanatory diagram of the lens barrel 100. Figure 2(a) is a front view of the lens barrel 100 (view of the lens barrel 100 from the eyepiece side). Figure 2(b) is a side view of the lens barrel 100. Figure 2(c) is a rear view of the lens barrel 100 (view of the lens barrel 100 from the objective lens side).

[0018] The lens barrel 100 is configured by a lens holder 110 and a lens cover 120 that are fixed together with a cover fixing screw 123 in a manner that sandwiches a lens barrel packing 130 therebetween.

[0019] The lens holder 110 is an inelastic lens holding member that holds some or all of the lenses in the optical lens 200 except for at least the G5 lens 250, which is the eyepiece lens. The lens holder 110 also holds a lens mask. In this embodiment, the lens holder 110 is made of engineering plastic, but it may also be made of metal. The lens holder 110 may also be metal-deposited on the inside or outside to reduce moisture permeability. Furthermore, the inside may be painted or matte-finished to prevent reflection.

[0020] An opening is provided on the side of the G1 lens 210 of the lens holder 110. In the opening of the lens holder 110, the G1 lens 210 is fixed by a G1 lens sealing sealing 115.

[0021] In this embodiment, the G1 lens 210 is made of circular optical glass with the top and bottom cut off, but the shape and material are not limited to this. The shape is not limited to circular, and it can be square or have an irregular shape with a cut-off portion. Optical plastic, ceramic, sapphire crystal, etc. can also be used. The G1 lens sealing seal 115 is made of, for example, a UV resin adhesive that hardens under UV light and secures the entire outer periphery of the G1 lens 210. The G1 lens sealing seal 115 is used to seal the gap between the G1 lens 210 and the lens holder 110. The G1 lens 210 and the lens holder 110 may also be secured by other methods. For example, a portion of the lens holder 110 may be thermally melted to secure the G1 lens 210 by caulking, and then sealing putty may be applied to the entire periphery of the gap.

[0022] The lens cover 120 holds one or more lenses, including at least the G5 lens 250, among the optical lenses 200. In this embodiment, the lens cover 120 is made of engineering plastic, similar to the lens holder 110, but other materials may be used. An opening is provided on the side of the lens cover 120 facing the G5 lens 250. The G5 lens 250 is fixed in the opening of the lens cover 250 by a G5 lens sealing seal 128. The G5 lens sealing seal 128 is made of, for example, a UV resin adhesive that hardens under UV light and fixes the outer periphery of the G5 lens 250. The G5 lens sealing seal 128 is used to seal the gap between the G5 lens 250 and the lens cover 112. The gap between the G5 lens 250 and the lens cover 120 may be fixed by other methods.

[0023] The lens holder 110 and the lens cover 120 are positioned relative to each other by lens cover positioning dowels 114 and positioning holes 124, and are fastened and fixed by cover fastening screws 123. A lens holder fastening surface 112 of the lens holder 110 abuts against a lens cover fastening surface 122 of the lens cover 120. In addition, a lens barrel packing 130 is sandwiched between the lens holder 110 and the lens cover 120, and is biased by the fastening and fixing.

[0024] In this embodiment, for ease of maintenance or disassembly and reassembly in the event of a malfunction, the lens holder 110 and lens cover 120 are fastened together using cover fastening screws 123. However, the fastening method is not limited to screw fastening, and any other method may be used as long as it can secure the lens barrel packing 130 in a biased state. For example, they may be secured by adhesive or welding.

[0025] 3 is a cross-sectional view taken along line AA in FIG. 2(a), with the optical axis direction being the upward direction on the paper.

[0026] A G3G4 mask 330 and a G4 lens 240 are fixed inside the lens holder 110. A G2 lens 220 and a G3 lens 230 are also fixed inside the lens holder 110. The effective light beam inside the lens barrel 100 is indicated by a light beam area 300. The light beam from the EVF panel 511 passes through the area of ​​the light beam area 300 on the left side of the page.

[0027] A G5 lens opening 125 is formed in the lens cover 120. A G5 lens 250 is attached to cover the G5 lens opening 125. A G5 lens periphery 251 of the G5 lens 250 is fitted into the G5 lens opening 125, and the position of the G5 lens 250 in the optical axis normal direction relative to the lens cover 120 is determined. The position of the G5 lens 250 in the optical axis direction is determined when a cover contact surface 253 abuts against a G5 lens contact surface 126 of the lens cover 120, and the G5 lens is sealed and fixed by a G5 lens sealing seal 128.

[0028] The G3G4 mask 330 is an inelastic light-blocking member for blocking unwanted light beams passing through the inside and outside of the optical lens 200. The G3G4 mask 330 is made of metal or engineering plastic. It may be matte-finished or painted as needed. The G3G4 mask 330 has a G3G4 mask opening 331. The G3G4 mask opening 331 defines the effective light beam. The G3G4 mask opening 331 has a G3G4 mask grounding portion 333 that abuts against the optical component grounding surface 116 of the lens holder 110 and a G3G4 mask abutting portion 332 that abuts against the G4 lens 240. In this embodiment, the G3G4 mask 330 is a separate inelastic member from the lens holder 110, but it may be the same inelastic member.

[0029] The G3G4 mask contact portion 332 contacts a G4 lens ground portion 244 that is located outside the effective lens surface range of the G4 lens 240. The G4 lens 240 is made of an optical plastic lens, and has the largest effective light beam area 245 of the light beam area 300 of the optical lens 200.

[0030] The lens barrel gasket 130 is made of butyl rubber or fluororubber. The lens barrel gasket 130 is manufactured by impression molding, a common method for rubber molding, but it may also be created by cutting or 3D printer lamination as long as the desired shape can be obtained. Since the lens barrel gasket 130 functions as a seal for anti-fogging purposes, the material must have low gas permeability, especially low water vapor permeability. Depending on the product purpose and usage environment, so-called silicone rubber or other parts may be acceptable, but silicone rubber has high gas permeability, including water vapor. Therefore, butyl rubber or fluororubber, which have low water vapor permeability, are preferred.

[0031] When the lens cover 120 is not attached, the optical component contact surface 116 abuts against the G3G4 mask contact portion 333. The G3G4 mask contact portion 332 abuts against the G4 lens contact portion 244. At this time, the G3G4 mask 330 and the G4 lens 240 simply rest on the lens holder 110, and if left as is, their positions are not fixed, preventing the desired optical performance from being achieved. Therefore, the G3G4 mask 330 and the G4 lens 240 must be fixed to the lens holder 110. However, the G4 lens 240 is made of optical plastic and is sensitive to loads. Fixing the G4 lens 240 with adhesive or thermal caulking can cause twisting or distortion, potentially reducing surface accuracy. Furthermore, depending on the material of the G4 lens 240, there may be no adhesive with adequate adhesive strength.

[0032] Therefore, in this embodiment, when the lens cover 120 is attached, the barrel packing 130 is arranged so that the inner region (first region) 131 is compressed between the inner packing contact surface 127 of the lens cover 120 and the G4 lens retaining portion 243 of the G4 lens 240. This allows the G4 lens 240 and the G3G4 mask 330 to be fixed by a biasing force. In other words, the G4 lens 240 is sandwiched between the barrel packing 130 and the G3G4 mask 330. At this time, the lens biasing surface 132 of the barrel packing 130 is compressed by the G4 lens retaining portion 243, generating an inner biasing force (first biasing force) F131, which biases the G4 lens 240 and the G3G4 mask 330 toward the lens holder 110 and fixes them. In this case, it is undesirable for the G4 lens retaining portion 243, the G4 lens grounding portion 244, the G3G4 mask contacting portion 332, and the G3G4 mask grounding portion 333 to be misaligned with respect to a plane perpendicular to the optical axis. If the positions are misaligned with respect to a plane perpendicular to the optical axis, a torsional force is applied to the G4 lens 240 and the G3G4 mask 330, resulting in a deterioration in optical performance. Therefore, the G4 lens retaining portion 243 and the G4 lens grounding portion 244 must be arranged so as to overlap when viewed from the optical axis direction. Furthermore, the G3G4 mask contacting portion 332 and the G3G4 mask grounding portion 333 must be arranged so as to overlap when viewed from the optical axis direction. Furthermore, to ensure stable flatness regardless of the torsional strength of the G4 lens 240, it is desirable to provide at least three or more G4 lens retaining portions 243, the G4 lens grounding portion 244, the G3G4 mask contacting portion 332, and the G3G4 mask grounding portion 333.

[0033] Furthermore, the inner packing contact surface 127 and the lens cover contact surface 133 are each substantially flat. This allows the inner biasing force F131 to be stabilized regardless of variations in the components or relative positions of the lens cover 120 and the G4 lens 240. Note that it is desirable that the flat area of ​​the lens cover contact surface 133 be larger than the area of ​​the G4 lens pressing portion 243.

[0034] On the other hand, in an outer region (second region) 134 of the lens barrel packing 130, the lens holder contact surface (contact surface) 135 contacts the packing contact surface 111 of the lens holder 110. Also, an outer biasing protrusion 137 protruding from the lens cover contact surface 136 contacts and is compressed with the outer peripheral packing contact surface 121 of the lens cover 120, generating an outer biasing force (first biasing force) F132, and the gap between the lens holder 110 and the lens cover 120 is sealed.

[0035] During assembly, the barrel gasket 130 is placed over the G4 lens 240 and the lens holder 110 with the G4 lens 240 mounted thereon, and then the lens cover 120 is placed over it. At this time, the barrel gasket 130 becomes difficult to see when the lens cover 120 is placed over it. Furthermore, if the barrel gasket 130 is not properly grounded, the barrel gasket 130 may become twisted or kinked when the lens cover 120 is attached, resulting in poor sealing after assembly. For this reason, the gasket contact surface 111 and the lens holder contact surface 135 are made substantially flat. This allows the barrel gasket 130 to be stably positioned on the gasket contact surface 111. Furthermore, because the purpose of providing the outer region 134 is to seal the interior of the lens barrel 100, the lens holder contact surface 135 and the biasing protrusions 137 are arranged in a ring shape with substantially the same shape around the entire circumference. Furthermore, the relationship between the outer peripheral packing contact surface 121 and the biasing projection 137 is constant over the entire circumference to prevent incomplete sealing due to biasing force.

[0036] In this embodiment, the biasing protrusions 137 have a fin-like shape that tilts outward from the optical axis, which prevents the biasing force from becoming too strong, stabilizes the screw tightening force when tightening the cover fixing screws 123, and improves workability.

[0037] The barrel gasket 130 has an inner region 131 that is sandwiched between the lens cover 120 and the G4 lens 240 and biases the G4 lens 240 and the G3G4 mask 330. The barrel gasket 130 also has an outer region 134 that is sandwiched around its entire circumference between the lens holder 110 and the lens cover 120, biases the lens cover 120, and seals the interior of the lens barrel 100. The inner region 131, which biases the G4 lens 240 and the G3G4 mask 330, and the outer region 134, which seals the interior of the lens barrel 100, each have different required functions. However, manufacturing them as an integrated part provides easier configuration and assembly. Therefore, in the present invention, the barrel gasket 130 is provided as an integrated part in which the inner region 131 and the outer region 134 are connected.

[0038] In this embodiment, as shown in FIG. 3 , the heights of the inner region 131 and the outer region 134 are set to be approximately the same. This allows the volume of the integrated lens barrel packing 130 to be minimized as much as possible. However, if the lens biasing surface 132 and the lens holder contact surface 135 were configured on the same surface, which would be susceptible to mutual displacement, the relative heights of the packing contact surface 111 and the G4 lens retaining portion 243 could result in insufficient or excessive biasing force in one of the inner and outer regions. For this reason, in this embodiment, a notch 138 is provided between the lens biasing surface 132 and the lens holder contact surface 135 to separate the lens biasing surface 132 and the lens holder contact surface 135 into non-coplanar surfaces. Note that providing the notch 138 is merely an example; any configuration is acceptable as long as the lens biasing surface 132 and the lens holder contact surface 135 are less susceptible to mutual displacement. Therefore, it is not always necessary to provide the notch 138, and for example, a configuration in which the lens biasing surface 132 and the lens holder contact surface 135 have a step may also be used.

[0039] Furthermore, the inner biasing force F131 generated in the inner region 131 is a force for biasing the G4 lens 240 made of optical plastic, which is prone to distortion, and the outer biasing force F132 generated in the outer region 134 is a force for reliably sealing the gap between the lens holder 110 and the lens cover 120. Therefore, the inner biasing force F131 and the outer biasing force F132 are set to be different from each other. Specifically, the inner biasing force F131, which is intended to bias the G4 lens 240 and the G3G4 mask 330, is set to be weaker (smaller) than the outer biasing force F132, which is intended to seal the gap.

[0040] Here, the point that lens barrel 100 must be divided into lens holder 110 and lens cover 120 when lens barrel 100 is configured to have airtightness will be explained.

[0041] If the effective luminous flux area of ​​the eyepiece lens (G5 lens 250) or the objective lens (G1 lens 210) is the largest within the luminous flux area 300 of the optical lens 200, then it is relatively easy to divide and seal the lens holder 110 and lens cover 120. For example, the lens holder 110 can be made box-shaped, and the lenses can be assembled in order so that the lens with the largest effective luminous flux area is placed last, and then the lens cover 120 can be used to cover the lens together with a gasket that seals the lens. Alternatively, the lens cover 120 can be eliminated and the outermost lens can be fixed with a gasket or adhesive.

[0042] However, it is not preferable to use the above method when the effective luminous flux area of ​​a lens that is not the outermost lens of the optical lens 200 is the largest. It is necessary to hold lenses in the lens holder 110 and the lens cover 120, respectively, and to seal the gap between the lens holder 110 and the lens cover 120 (the gap between the G4 lens 240 and the G5 lens 250, which have the largest effective luminous flux area 245 in this embodiment). In particular, considering ease of assembly, it is important to provide a gap between the G4 lens 240 and the adjacent lens that is installed after the G4 lens 240 in the component installation order along the optical axis of the optical lens 200. This allows the inner region 131 and outer region 134 of the lens barrel gasket 130 to be integrated and formed as simply as possible.

[0043] The configuration of the lens barrel packing 130 will be described below with reference to Fig. 4. Fig. 4 is an explanatory diagram of the lens holder 110. Fig. 4(a) shows a state in which the lens cover 120, cover fixing screws 123, and lens barrel packing 130 have been removed from the state shown in Fig. 2(a).

[0044] The G3G4 mask 330 is positioned in the lens holder 110 by a G3G4 mask positioner. Four G3G4 mask positioners 118a (two pairs) are provided in the vertical direction of the paper, and four G3G4 mask positioners 118b (two pairs) are provided in the horizontal direction of the paper.

[0045] The G4 lens 240 is positioned in the lens holder 110 by a G4 lens positioner. Four (two pairs) G4 lens positioners 117a are provided in the vertical direction of the paper, and two (one pair) G4 lens positioners 117b are provided in the horizontal direction of the paper.

[0046] Here, G4 lens retaining portions 243a, 243b, and 243c are arranged on the outside of the user-side lens surface 242 of the G4 lens 240. G4 lens grounding portions 244a, 244b, and 244c are arranged at approximately the same positions in the optical axis direction of the G4 lens retaining portions 243a, 243b, and 243c. The G4 lens grounding portions 244a, 244b, and 244c abut against the G3G4 mask abutting portion 332. Furthermore, the G3G4 mask 330 is provided with G3G4 mask retaining portions 334a, 334b, and 334c.

[0047] 4(b) shows the state in which the lens barrel packing 130 is attached to the lens barrel of FIG. 4(a). The line AA in FIG. 4(b) is the same as the line AA in FIG.

[0048] As shown in Figure 4(b), the lens barrel packing 130 is placed on the packing contact surface 111. Two packing position fixing holes 141 are formed in the lens barrel packing 130 as a rotation prevention mechanism. Two lens cover positioning dowels 114 are inserted into the packing position fixing holes 141 to prevent the lens barrel packing 130 from shifting position and prevent installation errors.

[0049] In this embodiment, the barrel packing 130 is non-circular, unlike typical packing that is screwed and fixed by the circular lens cover 120, and therefore can simultaneously bias multiple optical components in the optical axis direction. In the inner region 131 of the barrel packing 130, the lens biasing surface 132 is compressed by the G4 lens retaining portions 243a, 243b, and 243c and the G3G4 mask retaining portions 334a, 334b, and 334c. The G4 lens 240 and the G3G4 mask 330 are simultaneously biased and held at different locations.

[0050] In addition, in the outer region 134 of the lens barrel packing 130, a lens holder contact surface 135 is arranged in an annular shape on the packing contact surface 111, and an outer biasing protrusion 137 is also arranged in an annular shape. (Second embodiment) FIG. 5 is an explanatory diagram of a lens barrel 100 according to this embodiment. This embodiment is a derivative of the first embodiment, and only the configurations that differ from the first embodiment will be described in this embodiment. The same configurations as those in the first embodiment are designated by the same numbers and detailed descriptions will be omitted. Furthermore, with regard to the lens barrel gasket 430 in FIG. 5, the portion in which the hundredths of the lens barrel gasket 130 in the first embodiment have been changed from 1 to 4 has substantially the same function. For example, the inner region 131 in the first embodiment corresponds to the inner region 431 in this embodiment.

[0051] In this embodiment, the biasing protrusion 437 on the outside of the barrel packing 430 is a semicircular protrusion that protrudes from a fin-like shape toward the lens cover 120. When the biasing protrusion 137 has this shape, it can bias the lens cover 120 with a force stronger than that of the biasing protrusion 137. However, in this case, depending on the amount of protrusion of the biasing protrusion 437, the amount of compression of the barrel packing 430 may become excessive, and the reaction force may be too strong. Therefore, in this embodiment, a recess 439 for retracting the protrusion is provided to reduce the reaction force due to compression. In this case, the lens holder contact surface 435 is approximately flush with the surface, divided by the recess 439.

[0052] In addition, in the inner region 431, the G4G5 mask 340 is attached as a separate part to the lens cover 120. In the first embodiment, the inner gasket contact surface 127 contacts the lens cover contact surface 133. In this embodiment, the inner gasket contact surface 487 of the G4G5 mask 340, which is formed by a flat surface, contacts the mask contact surface 433 of the lens barrel gasket 430, which is formed by the same flat surface.

[0053] Furthermore, in the lens barrel packing 430, a step is provided between the lens biasing surface 432 and the lens holder contact surface 435, making them non-coplanar and less susceptible to displacement.

[0054] Furthermore, in this embodiment, the G4 lens 240 is directly grounded to the optical component grounding surface 116 of the lens holder 110. In the first embodiment, it is not possible to eliminate the influence of component tolerances and deformations of the G3G4 mask 330 on the optical performance of the G4 lens 240, but with the above configuration, there is no influence from the G3G4 mask 330, making it easier to adjust the optical performance.

[0055] The disclosure of this embodiment includes the following configuration. (Configuration 1) a first fixing member and a second fixing member fixed to each other; a lens disposed inside the first fixing member; an elastic member disposed between the first fixing member and the second fixing member in the optical axis direction, the elastic member is disposed between the second fixing member and the lens and includes a first region that biases the lens, and a second region whose entire periphery is sandwiched between the first fixing member and the second fixing member, A lens barrel, wherein a surface of the first region that urges the lens is different from a surface of the second region that urges the first fixing member. (Configuration 2) The lens barrel according to configuration 1, wherein a first biasing force of the first region that biases the lens is different from a second biasing force of the second region that biases the first fixing member. (Configuration 3) 3. The lens barrel according to configuration 2, wherein the first biasing force is smaller than the second biasing force. (Configuration 4) 4. The lens barrel according to any one of configurations 1 to 3, wherein the elastic member is located between the lens and a lens adjacent to the lens in the optical axis direction. (Configuration 5) The lens barrel according to any one of configurations 1 to 4, wherein the contact surface of the second region that contacts the first fixing member is a flat surface. (Configuration 6) The lens is sandwiched between the elastic member and the inelastic member, The lens barrel according to any one of configurations 1 to 5, wherein a surface where the lens is biased by the elastic member and a surface where the lens abuts against the non-elastic member overlap when viewed from the optical axis direction. (Configuration 7) 7. The lens barrel according to any one of configurations 1 to 6, wherein the elastic member biases the lens at a plurality of positions. (Configuration 8) The lens barrel according to any one of configurations 1 to 7, wherein the elastic member includes a rotation prevention mechanism. (Configuration 9) The lens barrel according to any one of configurations 1 to 8, wherein the elastic member is made of butyl rubber or fluororubber. (Configuration 10) 10. The lens barrel according to any one of configurations 1 to 9, wherein the second region includes a protrusion that contacts the second fixing member. (Configuration 11) 11. The lens barrel according to any one of configurations 1 to 10, wherein the surface of the second fixing member that comes into contact with the first region is a flat surface. (Configuration 12) 12. The lens barrel according to any one of configurations 1 to 11, wherein the lens is a plastic lens. (Configuration 13) a lens barrel according to any one of configurations 1 to 12; and a diopter adjustment unit that adjusts diopter. (Configuration 14) a lens barrel according to any one of configurations 1 to 12; An imaging device comprising: an imaging element.

[0056] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0057] 100 Lens barrel 110 lens holder (first fixing member) 120 Lens cover (second fixing member) 130 Lens barrel packing (elastic material) 131 Inner Region (First Region) 134 Outer area (second area) 240 G4 lens (lens)

Claims

1. a first fixing member and a second fixing member fixed to each other; a lens disposed inside the first fixing member; an elastic member disposed between the first fixing member and the second fixing member in the optical axis direction, the elastic member includes a first region that is disposed between the second fixing member and the lens and biases the lens, and a second region whose entire periphery is sandwiched between the first fixing member and the second fixing member, A lens barrel, wherein a surface of the first region that urges the lens is different from a surface of the second region that urges the first fixing member.

2. 2. The lens barrel according to claim 1, wherein a first biasing force of the first region that biases the lens and a second biasing force of the second region that biases the first fixing member are different.

3. 3. The lens barrel according to claim 2, wherein the first biasing force is smaller than the second biasing force.

4. 3. The lens barrel according to claim 1, wherein the elastic member is located between the lens and a lens adjacent to the lens in the optical axis direction.

5. 3. The lens barrel according to claim 1, wherein the surface of the second region that comes into contact with the first fixing member is a flat surface.

6. The lens is sandwiched between the elastic member and the inelastic member, 3. The lens barrel according to claim 1, wherein a surface of the lens where the elastic member biases the lens and a surface of the lens where the inelastic member abuts overlaps when viewed from the optical axis direction.

7. 3. The lens barrel according to claim 1, wherein the elastic member biases the lens at a plurality of positions.

8. 3. The lens barrel according to claim 1, wherein the elastic member includes a rotation prevention mechanism.

9. 3. The lens barrel according to claim 1, wherein the elastic member is made of butyl rubber or fluororubber.

10. 3. The lens barrel according to claim 1, wherein the second region includes a protrusion that comes into contact with the second fixing member.

11. 3. The lens barrel according to claim 1, wherein the surface of the second fixing member that comes into contact with the first region is a flat surface.

12. 3. The lens barrel according to claim 1, wherein the lens is a plastic lens.

13. The lens barrel according to claim 1 or 2; and a diopter adjustment unit that adjusts diopter.

14. The lens barrel according to claim 1 or 2; An imaging device comprising: an imaging element.

Images