Lens device and imaging apparatus

Abstract

To provide a lens device that suppresses performance variation caused by positional changes of an optical element accompanying attachment / detachment of an optical element unit, and ensures replacement workability of the optical element unit.SOLUTION: In a lens device 1 in which an optical unit 100 having a second optical element 2 is attachable to and detachable from a base lens barrel unit 200 having a first optical element 1000, the optical unit 100 includes: a fixing screw 3 that fixes the base lens barrel unit 200 and the optical unit 100; a screw accommodating portion 101 that accommodates the fixing screw 3; and a fixing screw operation hole 13b communicating with the screw accommodating portion 101. A depth of a spot-facing portion 19a provided in the screw accommodating portion 101 is shorter than a total length of the fixing screw 3, and an inner diameter of the fixing screw operation hole 13b is smaller than a diameter of a screw head of the fixing screw 3.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a lens device and an imaging device, and more particularly to a lens device having a structure in which a unit having an optical element can be selected and replaced. [Background technology]

[0002] Conventionally, there are known lens devices that allow users to attach and detach an exchange unit having optical elements that constitute the lens device or an exchange unit that can be attached and detached from the outside of the lens device. Such lens devices are composed of a base lens barrel unit that serves as a base and a detachable optical element unit.

[0003] If the optical element unit is a mount unit, the user can replace the mount of the lens device to match the desired camera mount. When replacing optical elements such as the mount unit, it is necessary to adjust the optical axis decenter of the mount unit to correct the imaging position. The optical element unit containing the optical elements is firmly fixed to the mounting surface with screws to prevent any changes in optical performance due to misalignment after the replacement work. When the interchangeable unit that can be attached and detached from the outside of the lens device is a drive unit that electrically drives the lens device, a known method for improving operability is to operate it using the drive unit. To ensure stable operation while appropriately transmitting power from the drive unit to the lens device, the optical device and the drive unit are precisely and firmly fixed with screws.

[0004] On the other hand, in order to properly fix the replacement unit to the lens device, it is necessary to use the same type of screw that fixes the replacement unit, so managing the screws that attach the replacement unit is important. For example, Patent Document 1 discloses a structure in which the fixing screws that fix a detachable drive unit to the lens device can be stored inside the lens device. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-128857 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the conventional technology disclosed in the above-mentioned patent document, the removed fixing screws are stored in the lens device, which requires the time and effort of removing the fixing screws from the lens device when attaching a drive unit to the lens device.

[0007] An object of the present invention is to provide a lens device that allows an interchangeable unit to be easily fixed to the lens device, and in particular to provide a lens device that ensures easy assembly work during replacement without changing the adjustment positions of the optical elements in an interchangeable unit having optical elements. [Means for solving the problem]

[0008] In order to solve the above problem, one aspect of the present invention provides a lens device in which an optical unit having a second optical element can be attached and detached to a base barrel unit having a first optical element, the optical unit comprising a fixing screw for fixing the optical unit to the base barrel unit, a screw storage section for accommodating the fixing screw, and a fixing screw operation hole communicating with the screw storage section, wherein the depth of the countersunk portion provided in the screw storage section is shorter than the overall length of the fixing screw, and the inner diameter of the fixing screw operation hole is smaller than the diameter of the screw head of the fixing screw. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a lens device that suppresses changes in performance due to changes in the position of optical elements that accompany attachment and detachment of an optical element unit, and ensures ease of replacement of the optical element unit. [Brief explanation of the drawings]

[0010] [Figure 1]FIG. 1 is a perspective view of a lens device according to a first embodiment. [Figure 2] FIG. 2 is a front view of the lens device. [Figure 3] FIG. 2 is a perspective view of the lens device with the mount unit removed. [Figure 4] FIG. 2 is a cross-sectional view of the lens device taken along line AA. [Figure 5] FIG. BB is a cross-sectional view of the lens device. [Figure 6] FIG. 10 is a diagram showing the fixing screw in the state where the mount unit is fixed. [Figure 7] 10A and 10B are diagrams showing the fixing screws when removing the mount unit. [Figure 8] FIG. 2 is a view of the mount unit as seen from the base barrel mounting surface side. [Figure 9] FIG. 2 is a view of the base barrel unit as seen from the mount unit attachment surface side. [Figure 10] FIG. 10 is a cross-sectional view of a lens device according to a second embodiment. [Figure 11] FIG. 1 is a schematic diagram showing an imaging device. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiment. In each drawing, the same members or elements are designated by the same reference numerals, and their description will be omitted.

[0012] [First embodiment] Hereinafter, a lens device according to a first embodiment will be described with reference to FIGS. Fig. 1 is a perspective view of a lens barrel 1 (lens device) in the first embodiment. Fig. 2 is a front view of the lens barrel 1. Fig. 3 is a perspective view of the lens barrel 1 with a mount unit 100 removed. Fig. 4 is a cross-sectional view taken along line AA in Fig. 2. Fig. 5 is a cross-sectional view taken along line BB in Fig. 2. FIG. 6 is a diagram showing the fixing screw 3 in a state where the mount unit 100 is fixed. FIG. 7 is a diagram showing the fixing screw 3 when removing the mount unit 100. FIG. 8 is a view of the mount unit 100 as seen from the base barrel mounting surface side. FIG. 9 is a view of the base barrel unit 200 as seen from the mount unit attachment surface side.

[0013] The lens barrel 1 includes a mount unit 100 having a lens mount (second optical element) 2, and a base barrel unit 200 having a base optical system (first optical element, optical element) 1000. The mount unit (optical unit) 100 includes a base lens barrel fixing cylinder (front housing) 18, a mount fixing cylinder (rear housing) 13, fixing screws 3, spacing washers 21, and the like. Furthermore, the base barrel fixing tube 18 of the mount unit 100 has a screw storage section 101 for storing the fixing screw 3. The mount unit 100 is fixed to the base barrel unit 200 by storing the fixing screw 3 in the screw storage section 101 and tightening the fixing screw 3 into a tap 10a formed in the rear fixing tube 10 of the base barrel unit 200.

[0014] The base barrel unit 200 includes a fixed barrel 9 and a rear fixed barrel 10. The rear fixed barrel 10 is provided with a set screw tap hole (first eccentricity adjustment portion) 10e, into which a set screw (operating member) 24 is inserted. In addition, base barrel unit 200 has a base barrel unit contact point 4 on the mounting unit attachment surface. Base barrel unit contact point 4 is pin-shaped and has a coil spring (not shown) provided inside in the longitudinal direction of the pin, and is mounted on base barrel unit substrate 6. Base barrel unit board 6 is attached to fixed barrel 9 of base barrel unit 200 via support posts 7 and base barrel unit board mounting screws 8. In addition, rear fixed barrel 10 is attached to fixed barrel 9 with rear fixed barrel mounting screws 11.

[0015] The mount unit 100 has a mount unit contact 5 on the base barrel mounting surface. The mount unit contact 5 is mounted on a mount unit substrate 12 having a conductive pattern, and is electrically connected to the camera connector 102 via a connection harness (not shown) so as to be able to communicate electrically.

[0016] The lens mount 2 is attached to a mount fixing cylinder 13 provided in the mount unit 100 with a lens mount fixing screw 14. The mount unit substrate 12 is attached to a mount substrate holding member 16 with a mount unit substrate fixing screw 15.

[0017] The mount substrate holding member 16 has an axial screw insertion hole 16a for inserting an axial screw 17. By fastening the axial screw 17 to the base lens barrel fixing tube 18, the mount substrate holding member 16 is held in an eccentric state relative to the base lens barrel fixing tube 18, so that play in the direction of the optical axis o is restricted between the screw head of the axial screw 17 and the base lens barrel fixing tube 18. With the above structure, the mount substrate holding member 16 and the fixing screw 3 are fastened together, and the mount substrate is sandwiched between the base lens barrel fixing tube 18 and the flange surface 10 b of the rear fixing tube 10 . The base lens barrel fixing tube 18 is fixed to the rear fixed tube 10 by tightening the fixing screws 3, and the mount fixing tube 13 is fixed to the base lens barrel fixing tube 18 by the mount fixing tube attachment screws 20 provided in the screw insertion holes 13a.

[0018] The base lens barrel fixing cylinder 18 has fixing screw insertion holes 19 that house and hold the fixing screws 3. The space formed by the fixing screw insertion holes 19 and the screw insertion holes 16c of the mount substrate holding member 16 is called a screw storage section 101.

[0019] The fixing screw insertion hole 19 is composed of a counterbore portion 19a and a screw insertion portion 19b. The diameter of the counterbore portion 19a of the fixing screw insertion hole 19 is larger than the diameter of the screw head 3a of the fixing screw 3. The distance from the mount fixing barrel abutment surface 18 a of the base lens barrel fixing barrel 18 to the rear fixing barrel abutment surface 16 b of the mount substrate holding member 16 is longer than the entire length of the fixing screw 3 . The depth of the counterbore portion 19 a of the fixing screw insertion hole 19 is shorter than the overall length of the fixing screw 3 . Furthermore, the diameter of the fixing screw operation hole 13b in the mount fixing cylinder 13 is smaller than the diameter of the screw head 3a of the fixing screw 3. The fixing screw operation hole 13b communicates with the screw storage portion 101. The fixing screw operation hole 13b has a diameter that allows a tool for operating the fixing screw 3 to be inserted therein.

[0020] A spacing washer 21 is provided between the base lens barrel fixing tube 18 and the rear fixed tube 10. The spacing washer 21 adjusts the distance in the direction of the optical axis o between the base optical system 1000 and the lens mount 2. The spacing washer 21 has screw through holes 21a and 21b through which the fixing screw 3 and the mount fixing tube attachment screw 20 can be inserted.

[0021] A blind washer 22 is provided in the screw insertion hole 13a of the mount fixing barrel 13. The blind washer 22 is affixed to the mount fixing barrel 13 when the lens barrel 1 is manufactured. Specifically, the blind washer 22 is affixed to the mount fixing barrel 13 after the mount fixing barrel 13 has been fixed to the base barrel fixing barrel 18. This prevents the mount fixing barrel attachment screw 20 from being manipulated when replacing the mount unit 100.

[0022] The structure is not limited to sealing the screw insertion hole 13a of the mount fixing barrel 13 with the blind washer 22. Any structure may be used that prevents manipulation when replacing the mount unit 100. With the above structure, when the mount unit 100 is removed from the base barrel unit 200, the fixing screw 3 can be held in the screw storage portion 101 of the mount unit 100. Furthermore, when the mount unit 100 is attached to the base barrel unit 200, the threaded portion of the fixing screw 3 is aligned with the screw insertion portion 19b and the screw insertion hole 16c of the screw storage portion 101, so it is in a stable position inside the screw storage portion 101. Therefore, when a tool is inserted through the fixing screw operation hole 13b of the mount fixing barrel 13, the fixing screw 3 can be operated without having to search for an operation position.

[0023] The difference in diameter between the threaded portion of the fixing screw 3, the screw insertion portion 19b, and the screw insertion hole 16c is used as a guide to stabilize the posture of the fixing screw 3, but this is not limitative. The difference in diameter between the screw head 3a of the fixing screw 3 and the countersunk portion 19a may be used as a guide. Also, to prevent the screw from loosening after being fixed by the fixing screw 3, an elastic member such as a spring washer may be provided on the countersunk portion 19a of the screw storage portion 101. The above configuration can reduce the time and effort required for the user to prepare the fixing screws 3 when replacing the lens. Furthermore, since the fixing screws 3 are provided in the mount unit 100, the risk of losing them can be eliminated. Furthermore, since the configuration uses a general fixing screw 3, the overall length of the mount unit 100 can be shortened compared to a structure in which a threaded portion is provided on the inner diameter of the fixing screw insertion hole, and a fixing screw with a structure in which only the tip of the fixing screw is the threaded portion, and the fixing screw is prevented from coming loose by the threaded portion of the insertion hole.

[0024] Next, the operation of attaching the mount unit 100 to the base lens barrel unit 200 will be described. The outer diameter 16d of the mount substrate holding member 16 fits into the first inner diameter 10c of the rear fixed barrel 10. In addition, the rotation stop pin 23 provided on the rear fixed barrel 10 fits into the rotation stop groove 16e of the mount substrate holding member 16. With this structure, when the mount unit 100 is attached to the base barrel unit 200, the mount substrate holding member 16 is fixed to the base barrel unit 200 at substantially the same position with respect to eccentricity and rotational position around the optical axis o.

[0025] Meanwhile, a gap (second eccentricity adjustment portion) exists between the second inner diameter 10d of the rear fixed barrel 10 and the outer diameter 18b of the base barrel fixed barrel 18. This allows the base barrel fixed barrel 18 to be pressed by a set screw 24 inserted into a set screw tap hole 10e of the rear fixed barrel 10, thereby adjusting the eccentric position of the base barrel fixed barrel 18 relative to the base barrel unit 200. In other words, the set screw 24 inserted into the set screw tap hole 10e allows the position of the lens mount 2 to be adjusted for eccentricity relative to the position of the base optical system 1000.

[0026] At this time, the mount substrate holding member 16 and the base barrel fixing tube 18 are in an eccentric relationship. Therefore, while the eccentric position of the mount substrate holding member 16 relative to the base barrel unit 200 remains fixed, the eccentric position of the base barrel fixing tube 18 relative to the base barrel unit 200 can be adjusted. In other words, the mount unit 100 allows adjustment of the optical eccentric position of the lens mount 2 while the contact position between the base barrel unit contact point 4 and the mount unit contact point 5 remains fixed.

[0027] The above structure allows the optical axis eccentricity adjustment amount and the area of ​​the contact point conductive pattern to be independent. In other words, the area required for the conductive pattern only needs to accommodate the component tolerances, making it possible to reduce the size of the board and the entire product while ensuring workability compared to electrical contacts using the contact point method. Alternatively, the conductive patterns corresponding to the adjacent contact pins can be arranged closer together without relying on optical eccentricity adjustment, thereby enabling the board and the entire product to be made smaller. Although the mount unit 100 having electrical contacts is configured as a detachable lens barrel 1, this is not limitative and the lens barrel 1 may have a configuration without electrical contacts.

[0028] The structure is such that a mount substrate holding member 16 is provided on the mount unit 100 side. This is a structure in which the mount unit contact point 5 is freely eccentric with respect to the mount unit 100, and by attaching it to the base lens barrel unit 200, the position of the mount substrate holding member 16 is fixed, and the lens mount 2 is freely eccentric, but this is not limited to this. For example, either the contact point of the mount unit 100 or the base barrel unit 200 may be configured to be eccentric. In other words, a base barrel substrate holding member may be provided on the base barrel unit 200 side. The base barrel unit contact point 4 may be freely decentered relative to the base barrel unit 200, and the position of the base barrel substrate holding member may be fixed by attaching the mount unit 100, allowing the base optical system 1000 to be freely decentered.

[0029] The eccentric position is fixed by fitting the outer diameter 16d of the mount substrate holding member 16 into the first inner diameter 10c of the rear fixed barrel 10 and fitting the rotation stop groove 16e into the rotation stop pin 23, but this is not limited to this. For example, a key shape may be provided on each of the mount substrate holding member 16 and the rear fixed barrel 10, and the eccentric position may be fixed by fitting the key shape.

[0030] Although the screw storage section 101 that holds the fixing screw 3 is sealed by the mount fixing barrel 13 to prevent the fixing screw 3 from coming loose, the present invention is not limited to this. For example, the diameter of the screw through hole 21a through which the fixing screw 3 of the spacing washer 21 provided between the base lens barrel fixing tube 18 and the rear fixing tube 10 is operated may be made smaller than the diameter of the screw head 3a of the fixing screw 3 to prevent the fixing screw 3 from coming loose.

[0031] [Second embodiment] A lens barrel 1 (lens device) according to the second embodiment will be described below with reference to FIG. FIG. 10 is a cross-sectional view of the lens barrel 1 in the configuration of the second embodiment. In the first embodiment, the mount unit 100 has a lens mount 2 as an optical element. In contrast, in the second embodiment, the mount unit 100 has a lens mount 2 and a mount optical system 1100 (optical element).

[0032] The mount optical system 1100 has the function of focusing light rays onto the imaging surface of the camera to which the lens barrel 1 is connected, and by making it an imaging optical system that corresponds to the camera's specific flange back, the entire product can be made smaller. In mount unit 100, there is a gap between the inner diameter of base barrel fixing barrel 18 and the outer diameter 13c of mount fixing barrel 13. This makes it possible to adjust the eccentric position of mount fixing barrel 13 relative to base barrel unit 200. Therefore, it is possible to adjust the eccentric positions of base barrel fixing barrel 18 and mount fixing barrel 13 relative to base barrel unit 200 while keeping the eccentric position of mount substrate holding member 16 relative to base barrel unit 200 fixed.

[0033] The diameter of the fixing screw operation hole 13b is smaller than the diameter of the screw head 3a of the fixing screw 3 so that the fixing screw 3 can be operated even when the mount fixing tube 13 is decentered with respect to the base lens barrel fixing tube 18. The amount of adjustment by the user can be kept small by adjusting the eccentricity of the mount fixing tube 13 relative to the base lens barrel unit 200 during manufacturing and the user adjusting the eccentricity with a set screw 24, improving the workability of replacing the mount unit 100.

[0034] FIG. 11 is a schematic diagram showing an imaging device 2000. As shown in FIG. As shown in FIG. 11, the imaging device 2000 includes a lens device 2100 and a camera body 2200. The camera body 2200 includes an image sensor 2210. The image sensor 2210 receives light from the lens device 2100. The lens device 2100 includes the lens barrel 1 described above. The lens device 2100 is attached to a camera body 2200. The lens device 2100 may be detachable from the camera body 2200, or may not be detachable. Lens device 2100 includes lens barrel 1, and therefore can provide a lens device that can obtain the effects of lens barrel 1. Furthermore, imaging device 2000 includes lens device 2100 that includes lens barrel 1, and therefore can provide an imaging device that can obtain the effects of lens barrel 1.

[0035] 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.

[0036] The disclosure of this embodiment includes the following configuration. (Configuration 1) A lens device in which an optical unit having a second optical element can be attached to and detached from a base barrel unit having a first optical element, The optical unit comprises: a fixing screw for fixing the base barrel unit and the optical unit; a screw storage portion that stores the fixing screw; a fixing screw operation hole communicating with the screw storage portion; Equipped with A lens device characterized in that the depth of the countersunk portion provided in the screw storage portion is shorter than the overall length of the fixing screw, and the inner diameter of the fixing screw operation hole is smaller than the diameter of the screw head of the fixing screw. (Configuration 2) The optical unit comprises: a front housing having the screw storage portion; a rear housing having the fixing screw operation hole and the second optical element; a spacing washer disposed between the front housing and the rear housing to adjust the spacing between the first optical element and the second optical element; Equipped with The base lens barrel unit includes: a first decentering adjustment unit that decenter-adjusts the position of the second optical element with respect to the position of the first optical element; an operating member for operating the first eccentricity adjusting unit; 2. The lens device according to claim 1, comprising: (Configuration 3) The lens device described in configuration 1 or 2, characterized in that the difference in diameter between the threaded portion through-hole provided in the countersunk portion and the threaded portion of the fixing screw is smaller than the difference in diameter between the countersunk diameter of the countersunk portion and the diameter of the screw head of the fixing screw. (Configuration 4) 4. The lens device according to any one of configurations 1 to 3, wherein a difference in diameter between the threaded portion through-hole provided in the countersunk portion and the threaded portion of the fixing screw is larger than a difference in diameter between the countersunk diameter of the countersunk portion and the diameter of the screw head of the fixing screw. (Configuration 5) 5. The lens device according to any one of configurations 1 to 4, wherein a tool for attaching and detaching the fixing screw is inserted into the fixing screw operation hole. (Configuration 6) The lens device according to any one of configurations 1 to 5, wherein the rear housing has a second decentering adjustment unit that decenter-adjusts the position of the second optical element relative to the position of the first optical element. (Configuration 7) 7. The lens device according to any one of configurations 1 to 6, wherein the fixing screw operation hole is formed so that the fixing screw can be operated even after the lens device has been decentered by the second eccentricity adjustment unit. (Configuration 8) The lens device described in any one of configurations 1 to 7, wherein the spacing washer is fitted to the front housing, has a diameter smaller than the screw head of the fixing screw, and has a screw operation hole that enables operation of the fixing screw. (Configuration 9) 9. The lens device of any one of configurations 1 to 8, wherein the first optical element is an optical element and the second optical element is a lens mount. (Configuration 10) 10. The lens device of any one of configurations 1 to 9, wherein the lens mount has an optical element. (Configuration 11) a lens device according to any one of configurations 1 to 10; a camera body to which the lens device is fixedly or detachably attached; An imaging device comprising: [Explanation of symbols]

[0037] 1 Lens barrel (lens device) 2 Lens mount (second optical element) 3 fixing screws 3a screw head 4 Base tube unit contacts 5 Mount unit contacts 6 Base tube unit board 7 Support column 8 Base tube unit board mounting screws 9 Fixed tube 10 Rear fixed barrel 10a Tap 10b Flange surface 10c inner diameter 10d inner diameter 10e Set screw tap hole (first eccentricity adjustment part) 11 Rear fixed barrel mounting screw 12 Mounting unit board 13 Mount fixed tube (rear housing) 13a Screw insertion hole 13b Fixing screw operation hole 13c outer diameter 14 Lens mount fixing screw 15 Mounting board fixing screws 16 Mounting board holding member 16a Axial screw insertion hole 16b Rear fixed tube abutment surface 16c Screw insertion hole (threaded hole) 16d outer diameter 16e Anti-rotation groove 17 Axial screw 18 Base lens barrel fixing tube (front housing) 18a Mount fixing barrel contact surface 18b Outer diameter 19 Fixing screw insertion hole 19a Counterbore 19b Screw insertion part 20 Mount fixing barrel mounting screw 21 Spacing washer 21a Screw hole (screw operation hole) 21b Screw hole (screw operation hole) 22 blind washer 23 Rotation stop pin 24 Set screw (operating part) 100 Mount unit (optical unit) 101 Screw storage section 102 camera connector 200 Base Tube Unit 1000 base optical system (first optical element, optical element) 1100 Mount Optical System (Optical Element) 2000 Imaging Device 2100 Lens Device 2200 camera body 2210 image sensor o Optical axis

Claims

1. A lens device in which an optical unit having a second optical element can be attached to and detached from a base barrel unit having a first optical element, The optical unit comprises: a fixing screw for fixing the base barrel unit and the optical unit; a screw storage portion that stores the fixing screw; a fixing screw operation hole communicating with the screw storage portion; Equipped with A lens device characterized in that the depth of the countersunk portion provided in the screw storage portion is shorter than the overall length of the fixing screw, and the inner diameter of the fixing screw operation hole is smaller than the diameter of the screw head of the fixing screw.

2. The optical unit comprises: a front housing having the screw storage portion; a rear housing having the fixing screw operation hole and the second optical element; a spacing washer disposed between the front housing and the rear housing to adjust the spacing between the first optical element and the second optical element; Equipped with The base lens barrel unit includes: a first decentering adjustment unit that decenter-adjusts the position of the second optical element with respect to the position of the first optical element; an operating member for operating the first eccentricity adjusting unit; 2. The lens device according to claim 1, comprising:

3. 2. The lens device according to claim 1, wherein a difference in diameter between the threaded portion through-hole provided in the countersunk portion and the threaded portion of the fixing screw is smaller than a difference in diameter between the countersunk diameter of the countersunk portion and the diameter of the screw head of the fixing screw.

4. 2. The lens device according to claim 1, wherein a difference in diameter between the threaded portion through-hole provided in the countersunk portion and the threaded portion of the fixing screw is larger than a difference in diameter between the countersunk diameter of the countersunk portion and the diameter of the screw head of the fixing screw.

5. 2. The lens device according to claim 1, wherein a tool for attaching and detaching the fixing screw is inserted through the fixing screw operation hole.

6. The lens device according to claim 2 , wherein the rear housing has a second decentering adjustment portion that decenter-adjusts the position of the second optical element relative to the position of the first optical element.

7. 7. The lens device according to claim 6, wherein the fixing screw operation hole is formed so that the fixing screw can be operated even after the lens device has been decentered by the second decentering adjustment portion.

8. 3. The lens device according to claim 2, wherein the spacing washer is fitted to the front housing, has a diameter smaller than that of the head of the fixing screw, and has a screw operation hole that allows the fixing screw to be operated.

9. 2. The lens device of claim 1, wherein the first optical element is an optical element and the second optical element is a lens mount.

10. The lens device of claim 9 , wherein the lens mount includes an optical element.

11. A lens device according to any one of claims 1 to 10; a camera body to which the lens device is fixedly or detachably attached; An imaging device comprising:

Images