JP2014142374A - Lens barrel and camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel that maintains sealability all over a range where a lens barrel advances and retreats in the lens barrel in which a barrel advances and retreats, improves water-proofness in a required area, and can reduce a driving load of the advancement and retreatment of the lens, and to provide a camera.SOLUTION: In the lens barrel having a seal member to be fixed to one inner surface of a relatively advancing and retreating first barrel and second barrel or one outer surface thereof, and having a tip of the seal member pressedly abutted against an outer diameter of one barrel or an inner diameter thereof, the seal member is composed of a plurality of fins. In a cross section including an optical axis in a component single part state where the seal member is not pressedly abutted against the lens barrel, a position in a radial direction of each tip of the fins is respectively different.

Description

  The present invention relates to a lens barrel and a camera, and more particularly to a lens barrel and a camera that have a retractable barrel structure and are waterproof and drip-proof.

  Conventionally, there are known lens barrels and cameras that have a multi-stage barrel structure that has a barrel structure that can be retracted and retracted, and that has a structure that prevents intrusion and immersion from the outside through adjacent cylinders. Yes.

  In the prior art disclosed in Patent Document 1, a seal member 13 is disposed between the second moving frame 4 and the lens barrel 5. The seal member 13 is a ring-shaped member that can be elastically deformed by silicon rubber or the like for shielding and waterproofing or drip-proofing and dust-proofing the gap between the second moving frame 4 and the lens barrel 5. One end is bonded and fixed to the second moving frame 4, and the fin portion of the seal member slides in a sealed state in contact with the outer peripheral surface of the other lens barrel 5.

  In the technique disclosed in Patent Document 2, as shown in FIGS. 6 and 7 of Patent Document 2, the outer diameter φD2 of the distal end portion 40a of the first lens frame 40 is larger than the outer diameter φD1 of the other portion. It has become. When the first lens frame 40 advances and retreats with respect to the cam barrel 30, the pressing amount of the seal member 31 that presses the outer diameter of the first lens frame 40 increases in a storage state such as a specific focal length or a retracted state. Become. That is, as shown in FIG. 7, while the first lens frame 40 moves from the wide position to the tele position, the outer diameter φD1 of the first lens frame 40 with which the seal member 31 is in pressure contact does not change. The pressing force of the member 31 does not change, and the zooming operation is performed smoothly. However, when the lens frame is moved to the retracted state, as shown in FIG. 6 of Patent Document 2, the sealing member 31 is pressed against the distal end portion 40a having a large outer diameter φD2 through the inclined surface 40b, and the pressing force is increased. Increases waterproofness.

JP 11-1119075 A JP-A-5-173240

  However, in Patent Document 1, in order to obtain waterproof and drip-proof properties, the fin portion of the seal member 13 requires a certain amount of pressing force on the outer peripheral surface of the lens barrel 5, and the second moving frame 4 and the lens mirror are required during zooming. There is a problem that the frame 5 becomes a sliding resistance when moving relative to the optical axis direction, leading to a decrease in zoom speed, an increase in power consumption, and an increase in the size of the zoom motor.

  In Patent Document 2, since the pressing amount of the seal member is adjusted by changing the distance between the seal member 31 and the outer diameter of the first lens frame 40, the distance is long due to the precision of parts and the rattling at the time of driving the lens frame. In some cases, the sealing member is separated from the outer diameter of the lens frame 40, and the waterproofness and dustproofness may be reduced.

  Therefore, an object of the present invention is to reduce the driving load of the lens advancement / retraction while maintaining the sealing property in the entire region where the lens barrel advances / retreats and improving the waterproofness in a necessary region in the lens barrel in which the lens barrel advances / retreats. It is to provide a lens barrel and a camera that can be used.

To achieve the above purpose,
The present invention of claim 1
Having a seal member fixed to one inner surface or the outer surface of the first and second lens barrels relatively moving forward and backward,
In the lens barrel in which the tip of the seal member is in pressure contact with the outer diameter or inner diameter of the other barrel,
The seal member consists of a plurality of fins,
In the cross section including the optical axis in a single part state that is not pressed against the lens barrel,
The lens barrel is characterized in that the radial position of each fin tip is different.
The present invention of claim 2
The lens driving device according to claim 1,
The lens barrel diameter to which the seal member is pressed is different depending on the lens feeding position,
At the position of the first lens barrel diameter, two or more fin tips are pressed against the lens barrel,
The lens barrel is characterized in that one fin tip is in pressure contact with the lens barrel at a second lens barrel diameter position different from the first lens barrel diameter.
The present invention of claim 3
In the lens barrel according to claim 1 or 2,
In the lens barrel, the thicknesses of the plurality of fins are different in the direction in which the lens barrel advances and retreats.
The present invention of claim 4
In the lens barrel according to claim 3,
Of the plurality of fins, the second fin is thicker than the first fin and has a short radial length.
The present invention of claim 5
The lens barrel according to claim 4, wherein
The second fin is a lens barrel that is disposed inside the lens barrel with respect to the first fin.
The present invention of claim 6
A camera having the lens barrel according to claim 1.

  According to the present invention, in a lens barrel in which the lens barrel advances and retreats, a lens that can maintain a sealing property in the entire area in which the lens barrel advances and retreats, and can improve a waterproof property in a necessary area, while reducing a driving load for lens advancement and retraction. A lens barrel and a camera can be provided.

Sectional view of the lens barrel and camera of the first embodiment Top view of the lens barrel and camera of the first embodiment Rear view of the camera of the first embodiment Sectional drawing of the sealing member of 1st Example Enlarged view of the retracted state of FIG. 1A part of the first embodiment Wide state enlarged view of FIG. 1A section of the first embodiment Tele state enlarged view of FIG. 1A part of the first embodiment Enlarged view when the pressure difference between inside and outside of part A of the first embodiment is within 0.2 atm. Enlarged view when the internal pressure of part A of the first embodiment is 0.2 atmospheres higher than the external pressure Enlarged view when the external pressure of part A of the first embodiment is higher than the internal pressure by 0.2 atm or more Flowchart of camera driving of the first embodiment

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  The first embodiment will be described below with reference to FIGS.

  FIG. 1 is a cross-sectional view of main parts of a lens barrel and a camera showing a first embodiment of the present invention.

  The camera of this embodiment has a zoom lens barrel. The zoom lens barrel includes a fixed frame 10 that is integrally attached to the camera body 1, and the upper half in FIG. The state where the zoom lens is moved to the wide position, and the lower half shows the state where the zoom lens is moved to the tele position. The main part of the camera is composed of the zoom lens barrel, the front cover 2 that covers the camera body 1, the rear cover 3 that covers the rear part, and the back cover 4. The zoom lens barrel 80 is rotatably fitted to the outer peripheral surface of the fixed frame 10 and is rotatably fitted to the inner peripheral surface of the fixed frame 10. The first cylinder holding the first lens holding frame 41 that supports the first lens group L1 and the cam barrel 30 made of the first lens frame that is rotated and driven by 20 and moves back and forth in the optical axis direction while rotating. The third lens frame holding the lens frame 40, the second lens frame 50 holding the second lens holding frame 51 supporting the second lens group L2, and the third lens holding frame 61 supporting the third lens group L3. 60, a barrier unit 70 supported by the first lens frame 40, a shutter unit supported by the second lens frame 50, and the like constitute a main part. An image sensor 90 that receives the image formed by the zoom lens is disposed in the camera.

  A waterproof rubber 6 (refer to FIG. 1) made of silicon rubber or the like is fixed between the front cover 2 and the rear cover 3 over the entire circumference, so that light and water droplets between the front cover 2 and the rear cover 3 can be prevented. It is designed to prevent intrusion. Furthermore, a seal member 11 made of silicon rubber or the like is fitted on the inner peripheral surface near the front end of the front cover 2 and the fitting portion at the tip of the fixed frame 10.

  Further, a seal member 12 made of silicon rubber or the like is attached to the inner peripheral surface near the distal end portion of the fixed frame 10, and the inner peripheral surface side of the distal end portion of the cam cylinder 30 is also made of silicon rubber or the like. A seal member 31 is attached. The outer peripheral surface of the cam cylinder 30 and the outer peripheral surface of the first lens frame 40 are provided with a fluorine-based water repellent coating. Therefore, the water-repellent coating and the two seal members 12 and 31 prevent light and water droplets from entering between the fixed frame 10 and the cam barrel 30 and between the cam barrel 30 and the first lens frame 40. Liquid tightness and light tightness are maintained.

  Further, the front lens of the first lens unit L1 supported by the first lens holding frame 41 and the first lens holding frame 41 are fixed with an adhesive. This adhesive also serves as a shield between the first lens holding frame 41 and the lens, thereby preventing water droplets from entering from the front side of the lens.

  Further, as shown in FIG. 1, the front cover 2 has a plurality of vent holes 2a, and an inner surface of the vent hole 2a is connected to the camera interior 2f under certain atmospheric pressure conditions. Room part 2e is arranged. A water sensor 95 that detects the presence or absence of water droplets is disposed in the small chamber portion 2e.

  FIG. 2 is a view showing the upper surface of the camera, and a release button 9 is disposed on the right front side of the upper surface of the front cover 2, and a rearward outer side corresponding to the release button 9. The rear grip 4b is formed so as to protrude slightly to the rear. On the front cover 2, one of the vents 2a is disposed.

  FIG. 3 is a rear view of the camera, on which a rear liquid crystal screen 4e for displaying a subject image and a reproduced image at the time of shooting and an EVF (electronic viewfinder) 3a are arranged.

  Hereinafter, the ventilation valve will be described.

  The lens barrel and camera are highly airtight cameras using a large number of seal members. Therefore, when the tip of the lens barrel expands and contracts from the wide state in the upper half of FIG. 1 to the tele state in the lower half by zooming, an air vent inside and outside the camera is required to reduce the difference in atmospheric pressure from the outside air. Become.

  The structure of the vent valve will be described with reference to FIG. 8 which is an enlarged view of A in FIG.

  The front cover 2 has an extension 2b and the rear cover 3 has an extension 3b. The two ends are joined to each other to provide a small chamber 2e. From the outside of the camera to the small room portion 2e, the two air vents 2a are connected to the outside air.

  A pressure valve (elastic plate) in which an internal vent 2c is disposed on the extension 2b inside the front cover 2 and one side of the pressure valve (elastic plate) 101 is fixed on one side by a screw 102 on the small chamber side. 101 closes the internal vent 2c. A sheet-like member 7 through which air passes and water droplets cannot pass is bonded to the opposite side of the internal vent 2c.

  Similarly, the structure of another vent valve will be described. Inside the front cover 2, an internal vent 2d is disposed on the extension 2b, and a sheet-like member 7 through which air passes and water droplets cannot pass is bonded to the small chamber 2e side. A pressure valve (elastic plate) 101 in which one side of the pressure valve (elastic plate) 103 is fixed on one side by a screw 104 closes the internal vent 2d.

  The sheet-like member 7 is made by immersing a cloth woven of polyester fibers in a water repellent such as silicon or fluorine and drying it. This sheet-like member 7 usually has a gap between the fibers, and if this gap is not subjected to water repellent treatment, water droplets will invade or permeate in this state. It is about the size. By the way, the waterproof droplet action of the sheet-like member 7 made of the woven fabric subjected to the water-repellent treatment is performed even if many water droplets adhere to the sheet-like member 7. The water droplets gather together to form water droplets that are larger than the eyes of the cloth, and the water droplets are prevented from passing through. Moreover, such a material is a very general material, for example, used as a cloth for a coat.

  The operation of the pressure valve will be described below.

  The operation when the internal pressure in the camera interior 2f is 0.2 atmospheric pressure or higher than the external pressure will be described. When the first lens frame 40 is contracted from the tele state to the wide state by zooming, the air pressure inside the camera 2f increases. When the inside of the camera reaches 0.2 atm or more from the outside, the pressure valve changes from the state of FIG. 8 to the state of FIG. That is, the elastic plate 101 pressing the inner vent 2c loses the internal air pressure, the tip is separated, and the inner vent 2c opens. Excess air inside the camera flows out to the small chamber portion 2e through the vent 2c, and further flows to the outside through the vent 2a. When the pressure difference becomes 0.2 atm, the pressure valve (elastic plate) 101 vents. Close the mouth 2c.

  The operation when the internal pressure of the camera internal 2f is 0.2 atmospheric pressure or more lower than the external pressure will be described. When the first lens frame 40 extends from the wide state to the tele state due to zooming, the air pressure inside the camera 2f decreases. When the inside of the camera becomes 0.2 atmospheres or more lower than the outside, the pressure valve changes from the state of FIG. 8 to the state of FIG. That is, the elastic plate 103 pressing the inner vent 2d loses the external air pressure, the tip is separated, and the inner vent 2d is opened. Through this vent 2d, air flows from the outside through the vent 2a to the small chamber portion 2e and through the internal vent 2d into the camera interior 2f. When the atmospheric pressure difference from the outside becomes 0.2 atm or less, the elastic force of the pressure valve (elastic plate) 103 is superior to the atmospheric pressure, and the internal vent 2d is blocked.

  Hereinafter, the structure of the seal member will be described.

  The seal member 31 is attached to the distal end portion of the cam barrel 30 that is the first lens frame, and the base portion is attached to press-contact the peripheral surface of the first lens frame 40.

  A seal member 11 is disposed between the fixed frame 2 and the first moving frame 3 which are a pair of lens frames, and a seal member 12 is disposed between the first moving frame 3 and the second moving frame 4. A seal member 12 is disposed between the second moving frame 4 and the lens barrel 5.

  Each of the seal members 31 is a ring-shaped member that can be elastically deformed by silicon rubber or the like for performing light shielding and waterproofing or dripproofing and dustproofing of the gap between the pair of lens frames. One end is bonded and fixed to one lens frame, and the fin portion of the seal member slides in a sealed state in contact with the outer peripheral surface of the other lens frame.

  FIG. 4 is a longitudinal sectional view showing a sectional shape of the sealing member 11 in the axial direction.

  As shown in FIG. 7, the seal member 31 is provided with two lip-shaped fin portions 31a and 31b extending inward, and an annular outer peripheral portion 31c parallel to the axis O ′ that is a fixed portion. Yes.

  The said one fin part 31a has a fin shape which inclines in the front side of an inner peripheral direction and becomes thin gradually in the front-end | tip direction. The other fin portion 31b has a small inclination toward the front side in the inner circumferential direction with respect to the fin portion 31a, is thick, and has a short tip length in the inward direction.

  As described above, one of the features of this embodiment is that the thicknesses of the fin portion 31a and the fin portion 31b are different from the tip length in the inward direction of the axial center O ′.

  Lubricating paint is applied to the rear side surfaces 31e and 31f which are sliding surfaces of the fin portions 31a and 31b. The front indicates the subject side direction when fixed to each lens frame, and the rear side indicates the image sensor side direction when fixed to each lens frame.

The seal member 31 has an outer peripheral portion 31 c bonded to the cam cylinder 30.
The cam cylinder 30 to which the seal member 31 is fixed is incorporated in the camera body. FIG. 5 is an enlarged cross-sectional view of the vicinity of the seal member 31 in the retracted state. The outer diameter of the first lens frame 40 is located on the inner diameter side of the seal member 31.

Here, assuming that the rear outer diameter of the first lens frame 40 is φD1, in the present invention, as shown in FIG. 5, the outer diameter φD2 of the distal end portion 40a of the first lens frame 40 is φD2> φD1.
It is formed to become. In other words, the distal end portion 40a of the first lens frame 40 is formed to have an outer diameter of φD2 that is larger than the middle through the inclined surface 40b.

  When formed in this way, the pressing amount of the seal member 31 interposed between the two lens frames increases in a storage state such as a specific focal length or a retracted state.

  In the retracted state of FIG. 5, the fin portions 31 a and 32 b of the seal member 31 are pressed radially outward by the outer diameter of the tip end portion 40 a of the first lens frame 40, and are in contact with inclination. Therefore, the side surfaces 31e and 31f to which the lubricating coating is applied come into contact with the outer peripheral surface of the front end portion 40a of the first lens frame 40.

  Next, in the wide state of FIG. 6, the first lens frame 40 is in a position extended forward with respect to the cam barrel 30. At this time, both the fin portions 31a and 32b of the seal member 31 are pressed radially outward by the outer diameter of the distal end portion 40a of the first lens frame 40, and are inclined and closely adhered as in the retracted state of FIG. Yes.

  Further, in the tele state of FIG. 7, the first lens frame 40 is further forwarded with respect to the cam barrel 30. At this time, on the inner diameter side of the seal member 31, a portion 40c having a small diameter φD1 of the first lens frame 40 is located. For this reason, the outer diameter portion 40c of the first lens frame 40 is further away from the outer peripheral portion 31c of the seal member 31 than 40a. The tip of the fin portion 31 a of the seal member 31 presses the outer diameter portion 40 c of the first lens frame 40 and is in contact with the inclined portion, but the tip of the fin portion 31 b is the outer diameter portion 40 c of the first lens frame 40. This is a free state without elastic deformation.

  As described above, in the retracted state and the wide state, the two fin portions 31a and 31b of the seal member 31 are in contact with the outer peripheral surface of the first lens frame 40. Even if it passes, it will be blocked by the second fin, and entry can be reliably prevented.

  In the section from the wide end to the tele end, only the tip of the fin portion 31a of the seal member 31 presses the outer diameter portion 40c (diameter φD1) of the first lens frame 40, and the fin is thick and has a high pressing force. Since the tip of the portion 31b is separated from the outer diameter portion 40c of the first lens frame 40, the dustproof and waterproof effect is lower than in the retracted state and the wide end state, but during zooming the first lens frame 40 and The sliding load between the seal members 31 is reduced, and the zoom speed can be increased, the power consumption can be reduced, and the zoom actuator can be downsized.

  In addition, although the example in which the seal member in the seal device of the above-described embodiment is fixed to the outer lens frame side between the pair of lens frames has been shown, the present invention is not limited thereto, and the seal member is fixed to the inner lens frame. Even if a structure in which the fin portion is in sliding contact with the inner surface of the outer lens frame, the same effect can be obtained.

  In this way, the lens barrel can make the lens at the wide end and retracted more waterproof than when used from the tele end to the front of the wide end. The waterproof property is further improved when carrying the camera without putting it in the case, or when the camera's main power is on and the camera is in the shooting standby state at the wide end. In general, the camera is more in the retracted state and the wide end state in the photographing standby than in the photographing state, so that it is possible to ensure waterproofness that matches the mode.

  In the above embodiment, the seal member 31 presses the outer peripheral surface of the first lens frame 40. However, this is because the seal member 31 is fixed to the first lens frame 40 and the cam is the first lens frame. Of course, the cylinder 30 may be configured to be pressed against the inner peripheral surface. In addition, the configuration in which the pressing amount increases in this way may be formed not only in the retracted state but also in the tele state. In this way, it is possible to further improve the waterproof property of the tele state that is frequently used at the time of shooting, and even if the zoom load increases at the tele end, it does not zoom further in the tele direction. There is no particular problem.

  Next, a series of zooming operations will be described.

  The operation of the lens barrel and the camera will be described with reference to the flowchart of FIG.

  First, when the main power of the camera is turned on from the non-use state, the process proceeds to step # 103 based on the determination that the main power is turned on in step # 101. In step # 103, the presence or absence of water droplets is detected by the water sensor 95 disposed in the small room portion 2e in the camera connected to the outside through the vent 2a. If water is detected, it is either underwater or heavy rain. It is determined that the camera is present in an environment with many water drops, and the process proceeds to step # 104. In step # 104, the extension from the retracted position to the wide side is prohibited to prevent water droplets from entering the lens barrel and the camera from the outside.

  On the other hand, if it is detected in step # 103 that there is no water by the water sensor, the process proceeds to step # 105, and the lens barrel is driven from the retracted state to the middle state. At this time, the lens barrel 40 is extended, the pressure inside the camera starts to drop, and the pressure difference with the outside becomes 0.2 atm or more, so the pressure valve 103 shown in FIG. External air flows into 2f. Then, the pressure difference between the inside and outside of the camera is within 0.2 atmosphere, and the pressure valves 101 and 103 are closed as shown in FIG. Next, in step # 106, when the lens barrel starts to be retracted from the middle state to the wide state, the atmospheric pressure inside the camera 2f increases. When the wide end state is reached, since the internal pressure of the camera is +0.15 atm, the pressure valves 101 and 103 remain closed as shown in FIG. In the state of the seal member 31, both the fin portions 31a and 31b press the outer peripheral surface of the large-diameter tip 40a of the first lens frame 40 as shown in FIG.

  In this state, even if the camera is used in an environment where there is much splashing in the water, the pressure on the two fin portions of the seal member 31 and the high internal pressure cause the water pressure on the seal members 31 and 11 and the waterproof rubber 6 portion. Even if it is applied, water droplets can be prevented from entering the camera.

  In step # 107, it is determined whether or not the photographer has operated the zoom. If the zoom operation is not performed, the process proceeds to step # 120, where the water sensor 95 determines external water droplets. If there is an external water droplet, the process proceeds to step # 121. If one hour has passed since the main power supply is turned on, the air inside the camera may have escaped from the joint of each seal member, and the internal pressure of the camera may have dropped. Therefore, in step # 122, a small retraction zoom drive is performed to increase the internal pressure of the camera internal 2f again. By this operation, the internal pressure of the camera is kept high to prevent water droplets from entering from the outside.

  On the other hand, in step # 107, it is determined whether or not the photographer has performed the zoom operation. If the zoom operation has been performed, the process proceeds to step # 108, where the external water droplet determination is performed by the water sensor 95. Proceed to 109. In step # 109, it is determined whether or not the zooming operation instructed by the photographer is in the extension direction. If the zoom operation is in the extension direction, the process proceeds to step # 110 and zoom drive is prohibited. To avoid zooming in the feeding direction when underwater or in a large amount of splashing water, the internal pressure of the camera decreases and water drops may enter the camera from the joint of the seal member 31 and the like. Zooming in the feeding direction is prohibited.

  If the zoom operation is in the built-in direction at step # 109, the process proceeds to step # 111 for driving in the direction in which the camera internal pressure increases, and the zoom operation in the normal retraction direction is performed.

The effects of the first embodiment are described above.
The effect of the shape of the seal member 31 and the outer diameter shape of the first lens frame 40 is that the fins 31a and 31b of the seal member 31 are in contact with the outer peripheral surface of the first lens frame 40 in the retracted state and the wide state. Therefore, even if water drops, dust, or the like passes through the first fin portion, it is blocked by the second fin portion and can be reliably prevented from entering.

  In the section from the wide end to the tele end, only the tip of the fin portion 31a of the seal member 31 presses the outer diameter portion 40c (diameter φD1) of the first lens frame 40, and the fin is thick and has a high pressing force. Since the tip of the portion 31b is separated from the outer diameter portion 40c of the first lens frame 40, the sliding load between the first lens frame 40 and the seal member 31 is reduced during zooming, the zoom speed is increased, and the power consumption is increased. And a zoom actuator can be reduced in size.

In addition, the effect of the zoom drive control by the arrangement of the pressure valves 101 and 103 and the output result of the water sensor 95 is
(1) Steps # 103 to 104 in the flowchart can prevent the intrusion of water droplets by prohibiting the lens barrel from being retracted to wide when the camera is already under water or in an environment with a large amount of water droplets when the camera is turned on. .
(2) When the main power supply of the camera is turned on in an environment with few water droplets, the internal pressure inside the lens barrel and the camera is increased beforehand by the steps # 103 to # 106 of the flowchart and the action of the pressure valve. , Can prevent the ingress of water droplets.
(3) Steps # 107 to 111 in the flowchart and the action of the pressure valve can prevent water droplets from entering the lens barrel and the camera during zoom driving.
(4) Steps 120 to 122 in the flowchart and the action of the pressure valve cause the internal pressure of the camera to increase and return at a certain time interval as air leaks from the gap of the seal member and the like as time passes and the internal pressure decreases. Thus, it is possible to prevent water droplets from entering the lens barrel and the inside of the camera.

2 Front cover 2a Vent 3 Rear cover 3a EVF (electronic viewfinder)
4 Back cover 4e Rear LCD screen 5 Lens frame 6 Waterproof rubber 7 Sheet-like member 9 Release button 10 Fixed frame 11 Seal member 12 Seal member 13 Seal member 20 Drive frame 30 Cam cylinder 31 Seal member 40 First lens frame 41 1st Lens holding frame 50 Second lens frame 51 Second lens holding frame 60 Third lens frame 61 Third lens holding frame 70 Barrier unit 80 Zoom lens barrel 90 Image sensor 95 Water sensor 101 Pressure valve (elastic plate)
102 Screw 103 Pressure valve (elastic plate)
104 screws

Claims (6)

Having a seal member fixed to one inner surface or the outer surface of the first and second lens barrels relatively moving forward and backward,
In the lens barrel in which the tip of the seal member is in pressure contact with the outer diameter or inner diameter of the other barrel,
The seal member consists of a plurality of fins,
In the cross section including the optical axis in a single part state that is not pressed against the lens barrel,
A lens barrel characterized in that the radial position of each fin tip is different. The lens barrel diameter to which the seal member is pressed is different depending on the lens feeding position,
At the position of the first lens barrel diameter, two or more fin tips are pressed against the lens barrel,
2. The lens barrel according to claim 1, wherein one fin tip is pressed against the lens barrel at a second lens barrel diameter position different from the first lens barrel diameter. 3. The lens barrel according to claim 1, wherein thicknesses of the plurality of fins differ in a direction in which the lens barrel advances and retreats. The lens barrel according to claim 3, wherein the second fin is thicker and the radial length is shorter than the first fin among the plurality of fins. The lens barrel according to claim 4, wherein the second fin is disposed inside the lens barrel with respect to the first fin. A camera comprising the lens barrel according to claim 1.