JP2013050685A - Lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arbitrarily adjust the operation torque of an operation ring according to the preference of a cameraman or depending on the circumstances of photography.SOLUTION: A lens device comprises: a fixed ring 5; an optical member (zoom lens) including a cam barrel 4 disposed inside of the fixed ring 5; and a zoom ring 16 which is concentrically disposed on the outer peripheral surface of the fixed ring 5 and rotates relative to the fixed ring 5 to operate the zoom lens, in which grease 50 is filled between the fixed ring 5 and the zoom ring 16. The zoom ring 16 is configured so as to be elastically deformed according to the grip strength held when operating the zoom ring 16. The cameraman deforms the zoom ring 16 by grip strength to change the thickness of the clearance between the zoom ring 16 and the fixed ring 5, and thus the viscous resistance (operation torque) by the grease 50 may be arbitrarily adjusted.

Description

  The present invention relates to a lens apparatus, and more particularly to a lens apparatus in which an optical member such as a zoom lens, a focus lens, or an iris is operated by a manual operation force.

  A lens device mounted on an ENG (Electronic News Gathering) camera that can be carried is used for TV coverage. The ENG camera is photographed by being fixed to a tripod or being carried around.

  FIG. 9 shows an example of a zoom mechanism provided in this type of lens device. As shown in FIG. 9, the zoom ring 1 and the cam cylinder 2 are connected via a rod-like connecting shaft 3, and when the zoom ring 1 is rotated, the cam cylinder 2 can be rotated. A lens 6 held by a lens frame 4 is disposed inside the cam cylinder 2. A cam follower 4 a is implanted in the lens frame 4, and the cam follower 4 a is slidably inserted into a cam groove 2 a of the cam cylinder 2 and a rectilinear groove 5 a formed in the fixed ring 5. ing. Accordingly, the lens frame 4 is held movably in the optical axis direction, and is moved in the optical axis direction by the rotation of the cam cylinder 2 by the rotation operation of the zoom ring 1.

  When a cameraman manually operates a zoom lens or the like, it is desirable to obtain an operation torque in line with the cameraman's intention. Conventionally, the operating torque of a zoom lens or the like varies depending on the grease filled between the zoom ring 1 and the cam barrel 2 and the tightening amount of the parts, and the amount of grease and The tightening amount was adjusted.

  Patent Document 1 describes a technique of switching to an autofocus start mode by elastically deforming a focus ring and pressing a conductive member inside the ring to energize it (paragraph [0060] of Patent Document 1).

  Patent Document 2 describes a technique for keeping the operating force of the zoom ring constant by rotating the cam member to change the elastic deformation state of the urging member and changing the frictional force.

  Patent Document 3 discloses a technique in which an elastic member is disposed in a recess provided in an inner cylinder of a lens barrel, and the elastic member is elastically deformed when the outer cylinder rotates to generate a frictional force, thereby changing the rotational operation force. Is described.

JP 2002-107604 A JP-A-8-334669 JP 2008-52219 A

  When manually operating the zoom lens, etc., when moving the zoom lens quickly between the wide end and the tele end, or when moving the focus lens quickly between the close end and the infinity end On the other hand, when the torque is small and the actuator is moved slowly, it is easier to operate when the operating torque is larger. Further, the magnitude of the operating torque varies depending on the photographer's preference.

  The invention described in Patent Document 1 does not adjust the operating torque of the focus ring. The invention described in Patent Document 2 keeps the operating force of the zoom ring constant, and the cameraman does not adjust the operating torque to his own preference. Further, the invention described in Patent Document 3 changes the operating force in accordance with the rotational direction by an elastic member having an asymmetrical cross section disposed between the inner cylinder and the outer cylinder of the lens barrel. It does not adjust the magnitude of the torque to the photographer's preference.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a lens device that can arbitrarily adjust the operation torque of the operation ring according to the photographer's preference or according to the shooting situation. And

  In order to achieve the above object, a lens device according to an aspect of the present invention includes a stationary ring, an optical member disposed inside the stationary ring, and a concentric arrangement on the outer peripheral surface of the stationary ring. And an operating ring for operating the optical member by rotating with respect to the stationary ring, and a lens device filled with a lubricant between the stationary ring and the operating ring, wherein the operating ring Is configured to be elastically deformed according to a gripping force grasped when the operation ring is operated, and the viscous resistance due to the lubricant is changed by a change in the thickness of the gap between the stationary ring and the operation ring. Yes.

  According to one aspect of the present invention, when a gripping force for gripping the operation ring is increased and the operation ring is operated, the operation ring is elastically deformed according to the gripping force to be gripped, and the fixed ring and the operation ring are The gap changes. When the gap between the stationary ring and the operation ring becomes narrow, the viscous resistance of the lubricant filled in the gap increases, and the operation torque increases. That is, the cameraman can adjust the operation torque of the operation ring by adjusting the gripping force for gripping the operation ring.

  In the lens device according to another aspect of the present invention, the operation ring is configured such that the ease of elastic deformation varies depending on the position of the lens device in the optical axis direction. Thereby, the deformation amount (operation torque) of the operation ring can be adjusted by adjusting the position where the operation ring is gripped.

  In the lens device according to still another aspect of the present invention, the operation ring is configured such that the thickness continuously changes corresponding to the position of the lens device in the optical axis direction. Thereby, even if the gripping force for gripping the operation ring is constant, the deformation amount (operation torque) of the operation ring can be continuously adjusted by adjusting the position where the operation ring is gripped.

  In the lens device according to still another aspect of the present invention, the operation ring is configured such that the thickness changes stepwise corresponding to the position of the lens device in the optical axis direction. Thus, even if the gripping force for gripping the operation ring is constant, the deformation amount (operation torque) of the operation ring can be adjusted stepwise by adjusting the position where the operation ring is gripped.

  In the lens device according to still another aspect of the present invention, a ring member made of an elastic member that is more easily elastically deformed than the operation ring, covering an outer peripheral surface of the operation ring and covering the operation ring Therefore, it is preferable to provide a ring member whose outer diameter is substantially constant regardless of the position in the optical axis direction. Thereby, even if the thickness of the operation ring is different at the position in the optical axis direction, the diameter of the outer peripheral surface can be kept substantially constant, and the operation can be performed without a sense of incongruity.

  In the lens device according to still another aspect of the present invention, the operation ring includes a plurality of V-shaped cuts formed at equal intervals on an inner peripheral surface of the operation ring, and one of the plurality of cuts. Deformation occurs when the cuts of the part are widened and the cuts of the other part are narrowed. That is, when the operating ring is gripped with an appropriate gripping force, a tensile force acts on a part of the inner peripheral surface side of the operating ring, and a compressive force acts on the other part. The V-shaped notch in the vicinity of the inner peripheral surface on which the pulling force acts is expanded, and the notch in the vicinity of the inner peripheral surface on which the compressive force is applied becomes narrower.

  In the lens device according to still another aspect of the present invention, the operation ring has a different depth or number of the V-shaped cuts depending on the position of the lens device in the optical axis direction, and is easily elastically deformed. Is different depending on the position of the lens device in the optical axis direction. Thereby, the deformation amount (operation torque) of the operation ring can be adjusted by adjusting the position where the operation ring is gripped.

  In the lens device according to still another aspect of the present invention, it is preferable that the lens device includes a deformation preventing unit that restricts deformation of the operation ring beyond a certain level. The gap between the stationary ring and the operation ring is filled with a lubricant, but when the gap becomes 0, the lubricant runs out and the operation torque becomes excessive. Therefore, the deformation preventing means limits the deformation of the operation ring so that the lubricant does not run out.

  In the lens device according to still another aspect of the present invention, the deformation preventing means is a lubricant filled in a gap between the stationary ring and the operation ring, and fine particles for securing a minimum gap are kneaded. It is an embedded lubricant. The fine particles kneaded in the lubricant prevent the gap between the stationary ring and the operation ring from becoming narrower than the diameter of the fine particles and prevent the lubricant from running out.

  In the lens device according to still another aspect of the present invention, the operation ring is limited in deformation beyond a certain level by blocking a part of the plurality of V-shaped cuts. The That is, when the operation ring is further deformed, the V-shaped notch in the vicinity of the inner peripheral surface to which the compressive force is applied is closed. Thereby, the excessive deformation | transformation of the said operation ring can be prevented, and failure | damage of components or a lubricant shortage can be prevented.

  In the lens device according to still another aspect of the present invention, the optical member disposed inside the stationary ring is a focus lens, a zoom lens, or an iris.

  According to the present invention, since the operation ring is elastically deformed according to the gripping force for gripping the operation ring, the viscosity resistance (operation torque) of the lubricant filled in the gap between the stationary ring and the operation ring is reduced. The photographer can arbitrarily adjust the operation torque of the operation ring according to his / her preference or according to the shooting situation.

The top view which showed the external appearance of the ENG lens to which the lens apparatus based on this invention was applied Sectional drawing which shows the principal part which shows 1st Embodiment of the lens apparatus shown in FIG. Sectional drawing which shows the principal part which shows 2nd Embodiment of the lens apparatus based on this invention. Sectional drawing which shows the principal part which shows 3rd Embodiment of the lens apparatus based on this invention. Sectional drawing which shows the principal part which shows 4th Embodiment of the lens apparatus based on this invention. Sectional drawing which shows the principal part which shows 5th Embodiment of the lens apparatus based on this invention. Sectional drawing which shows the principal part which shows 6th Embodiment of the lens apparatus based on this invention. Sectional drawing of the principal part which shows 7th Embodiment of the lens apparatus based on this invention. Sectional view of the main part of a conventional lens device

  Hereinafter, embodiments of a lens apparatus according to the present invention will be described with reference to the accompanying drawings.

[Appearance of lens unit]
FIG. 1 is a plan view showing an external appearance of an ENG lens to which a lens apparatus according to the present invention is applied. An ENG lens 10 shown in FIG. 1 is an inner focus zoom lens used in a broadcast television camera such as an ENG camera. The lens barrel 12 is provided with a focus ring 14, a zoom ring 16, and an iris ring 18. An extender device 20 is provided at the rear of the iris ring 18. At the rear end of the lens barrel 12, there is provided a mount portion 122 that is detachably attached to a lens mount of a camera body (camera head) on which an image sensor or the like is mounted.

  A drive unit 24 for driving the focus ring 14, zoom ring 16 and iris ring 18 with a motor is attached to the side of the lens barrel 12.

  Although a detailed description of the internal configuration of the lens barrel 12 is omitted, as is well known, as a photographing optical system supported in the lens barrel 12, a fixed focus lens group and a moving focus are sequentially arranged from the front (subject side). A lens (simply referred to as a focus lens group), a variable power lens group (zoom lens group), a diaphragm (aperture device), a relay lens group, and the like are arranged. Then, by rotating the focus ring 14, the focus lens group moves back and forth along the optical axis, the focus (focus position) of the photographing optical system moves to the near side or infinity side, and the zoom ring 16 rotates. As a result, the zoom lens group moves back and forth along the optical axis, the zoom (focal length) of the photographing optical system moves to the wide side or the tele side, and the iris ring 18 rotates to change the aperture diameter of the diaphragm. However, the aperture value of the photographing optical system is increased or decreased.

  The drive unit 24 has a case 28, and the case 28 is attached to the side of the lens barrel 12 with screws 19 and 19.

  In the case 28, a focus drive motor, a zoom drive motor, an iris drive motor, and the like (not shown) are arranged. The focus drive motor is connected to the focus ring 14 via a gear transmission mechanism, and the focus ring 14 is rotated by the power of the focus drive motor.

  The zoom drive motor is connected to the zoom ring 16 via a gear transmission mechanism, and the zoom ring 16 is rotated by the power of the zoom drive motor. Similarly, the iris driving motor is connected to the iris ring 18 through a gear transmission mechanism, and the iris ring 18 is rotated by the power of the iris driving motor.

  On the upper surface of the case 28, there are provided a zoom seesaw control switch 30, an aperture auto / manual mode switch 32, and the like.

  A grip band 40 is provided on the side surface of the case 28. An operator (cameraman) can hold the lens barrel 12 by inserting the right hand (four fingers other than the thumb) into the grip band 40. On the rear surface of the case 28, a VTR switch 42 is provided for operating start / end of recording when recording (recording) a video being shot.

<First Embodiment>
FIG. 2 is a cross-sectional view of the main part showing the first embodiment of the lens device 10, and shows the cross section of the zoom lens portion. In addition, the same code | symbol is attached | subjected to the part which is common in the conventional lens apparatus shown in FIG. 9, and the detailed description is abbreviate | omitted. In FIG. 2, the lens frame 4 and the lens 6 shown in FIG. 9 are omitted.

  In FIG. 2, the structure of the zoom ring 16 is different between the first embodiment of the lens apparatus 10 according to the present invention and the conventional lens apparatus shown in FIG.

  The zoom ring 16 is configured so that it can be easily deformed by the gripping force of the cameraman gripping the zoom ring 16, and is configured of, for example, a soft resin or a resin having a reduced thickness.

  The stationary ring 5 is made of an aluminum alloy or a hard resin, and has a rigidity that is not deformed by the grip force of the photographer. Further, a grease 50 as a lubricant is filled between the zoom ring 16 and the stationary ring 5.

  Now, in FIG. 2C, when a pressure (gripping force from the photographer) is applied to the zoom ring 16 from the direction of the arrow, the zoom ring 16 is elastically deformed, and the gap between the zoom ring 16 and the fixed ring 5 is Narrows according to grip strength.

  The operating torque of the zoom ring 16 varies depending on the viscous resistance (rotational resistance) of the grease 50 filled between the zoom ring 16 and the stationary ring 5 and the clamping force of each component. When the gap between the ring and the stationary ring 5 becomes narrow, the viscous resistance increases. This is because the viscous resistance is inversely proportional to the thickness of the gap filled with the grease 50.

  Thus, when the cameraman manually operates the zoom ring 16, by adjusting the gripping force for gripping the zoom ring 16 (that is, by adjusting the gap between the zoom ring 16 and the fixed ring 5, the viscous resistance caused by the grease 50). The operating torque of the zoom ring 16 can be adjusted.

<Second Embodiment>
FIG. 3 is a cross-sectional view of an essential part showing a second embodiment of the lens apparatus according to the present invention, and shows a cross section of a zoom lens portion. In addition, the same code | symbol is attached | subjected to the part which is common in 1st Embodiment shown in FIG. 2, and the detailed description is abbreviate | omitted.

  The lens device of the second embodiment shown in FIG. 3 is mainly different in the cross-sectional shape of the zoom ring 161 from the lens device of the first embodiment shown in FIG.

  As shown in FIG. 3, the zoom ring 161 is common to the zoom ring 16 shown in FIG. 2 in that the zoom ring 161 can be easily deformed by a gripping force that the cameraman holds the zoom ring 16. The difference is that the thickness of the photographing optical system in the optical axis direction is continuously changed.

  Thereby, even if the gripping force for gripping the zoom ring 161 is constant, the deformation amount (operation torque) of the zoom ring 161 is continuously increased by adjusting the position (position in the optical axis direction) where the zoom ring 161 is gripped. Can be adjusted.

  Therefore, the cameraman grasps a position where the zoom ring 161 is easily deformed (thin wall) in a scene where the operating torque of the zoom ring 161 is to be increased, and in a scene where the operating torque of the zoom ring 161 is to be decreased. The zoom ring 161 can be operated under a desired operation torque by gripping and operating a portion where the lens is difficult to deform (a thick portion).

<Third Embodiment>
FIG. 4 is a cross-sectional view of an essential part showing a third embodiment of the lens apparatus according to the present invention, and shows a cross section of a zoom lens portion. In addition, the same code | symbol is attached | subjected to the part which is common in 2nd Embodiment shown in FIG. 3, and the detailed description is abbreviate | omitted.

  The lens device of the third embodiment shown in FIG. 4 is different from the lens device of the second embodiment shown in FIG. 3 mainly in the cross-sectional shape of the zoom ring 162.

  That is, in the zoom ring 161 according to the second embodiment shown in FIG. 3, the thickness in the optical axis direction of the photographing optical system continuously changes, whereas the third embodiment shown in FIG. The zoom ring 162 is different from the second embodiment in that the thickness of the zoom ring 162 is configured to change stepwise.

  The zoom ring 162 shown in FIG. 4 corresponds to the position of the photographing optical system in the optical axis direction, that is, a thin part 162a, a middle part 162b, and a thick part 162c. The wall thickness is configured to change in stages. Thereby, even if the gripping force for gripping the zoom ring 162 is constant, the deformation amount (operation torque) of the zoom ring 162 can be adjusted stepwise by adjusting the position where the operation ring is gripped stepwise. it can.

  In other words, the cameraman grasps the thin-walled portion 162a where the zoom ring 162 is easily deformed in a scene where the operation torque of the zoom ring 162 is to be increased, and the zoom ring 162 is deformed in a scene where the operation torque of the zoom ring 162 is to be decreased. The zoom ring 161 can be operated under a desired operation torque by grasping and operating the thick-walled portion 162c that is difficult to perform.

<Fourth Embodiment>
FIG. 5 is a cross-sectional view of an essential part showing a fourth embodiment of the lens apparatus according to the present invention, and shows a cross section of a zoom lens portion. In addition, the same code | symbol is attached | subjected to the part which is common in 2nd Embodiment shown in FIG. 3, and the detailed description is abbreviate | omitted.

  The lens device of the fourth embodiment shown in FIG. 5 is different from the lens device of the second embodiment shown in FIG. 3 in that a rubber ring 52 is added.

  As shown in FIG. 5, the rubber ring 52 covers the outer peripheral surface of the zoom ring 161 and covers the zoom ring 161, and the outer diameter thereof is substantially constant regardless of the position in the optical axis direction of the photographing optical system. It has become. Accordingly, the operation can be performed without being aware of the taper of the outer peripheral surface of the zoom ring 161 (uncomfortable feeling).

  The thickest part of the rubber ring 52 is made of an elastic material that is sufficiently deformable compared to the thinnest part of the zoom ring 161, so that the thickness of the rubber ring 52 can be zoomed. The ease of deformation of the ring 161 is not affected.

<Fifth Embodiment>
FIG. 6 is a cross-sectional view of a principal part showing a fifth embodiment of the lens apparatus according to the present invention, and shows a cross section of a zoom lens portion. In addition, the same code | symbol is attached | subjected to the part which is common in 3rd Embodiment shown in FIG. 4, and the detailed description is abbreviate | omitted.

  The lens device of the fifth embodiment shown in FIG. 6 is different from the lens device of the third embodiment shown in FIG. 4 in that a rubber ring 54 is added.

  As shown in FIG. 6, the rubber ring 54 covers the outer peripheral surface of the zoom ring 162 and covers the zoom ring 162, and the outer diameter thereof is substantially constant regardless of the position in the optical axis direction of the photographing optical system. It has become. Accordingly, the operation can be performed without being aware of the level difference on the outer peripheral surface of the zoom ring 162 (uncomfortable feeling).

<Sixth Embodiment>
FIG. 7 is a cross-sectional view of a main part showing a sixth embodiment of the lens apparatus according to the present invention, and shows a cross section of the zoom lens portion. In addition, the same code | symbol is attached | subjected to the part which is common in 2nd Embodiment shown in FIG. 3, and the detailed description is abbreviate | omitted.

  Compared with the lens device of the second embodiment shown in FIG. 3, the lens device of the sixth embodiment shown in FIG. 7 has grease 56 filled in the gap between the zoom ring 161 and the fixed ring 5. It is different.

  FIG. 7B is an enlarged view of the gap between the zoom ring 161 and the fixed ring 5 shown in FIG. As shown in FIG. 7B, fine particles (beads) 56a such as tungsten or ceramic are kneaded in the grease 56 filled in the gap between the zoom ring 161 and the stationary ring 5.

  Thereby, even if the deformation of the zoom ring 161 progresses, the fine particles 56a are interposed in the gap between the zoom ring 161 and the stationary ring 5 (FIG. 7C), and the gap becomes zero (the grease is run out). ) And the operation torque of the zoom ring 161 is prevented from becoming excessive.

  The grease 56 in which the fine particles 56a are kneaded is not limited to that of the second embodiment, and may be filled in the gap between the zoom ring and the stationary ring of other embodiments.

<Seventh Embodiment>
FIG. 8 is a cross-sectional view of an essential part showing a seventh embodiment of the lens apparatus according to the present invention, and shows the cross section of the zoom lens portion. In addition, the same code | symbol is attached | subjected to the part which is common in 1st Embodiment shown in FIG. 2, and the detailed description is abbreviate | omitted.

  As shown in FIG. 8, the zoom ring 163 is common to the zoom ring 16 shown in FIG. 2 in that the zoom ring 163 can be easily deformed by a gripping force that the cameraman holds the zoom ring 16. The zoom ring 163 is different in that a plurality (eight in this embodiment) of V-shaped cuts 163a are formed at equal intervals on the inner peripheral surface of the zoom ring 163.

  In the zoom ring 163, the portion of the eight V-shaped cuts 163a is deformed by a pressing force from the outside. That is, as shown in FIG. 8B, when the zoom ring 163 is rotated by applying an appropriate gripping force (pressing force in the arrow direction on FIG. 8B) to the zoom ring 163, the inner periphery of the zoom ring 163 is obtained. Tensile force acts on a part of the surface side (the clock hands at 12 o'clock and 6 o'clock positions on FIG. 8 (b)), and a part on the inner peripheral surface side (clock hand at 3 o'clock, The compression force acts at the 9 o'clock position. The V-shaped notch 163a in the vicinity of the inner peripheral surface on which the pulling force acts is expanded, and the notch 163a in the vicinity of the inner peripheral surface on which the compressive force acts is narrowed.

  When the gripping force for gripping the zoom ring 163 is increased and the deformation amount of the zoom ring 163 is increased, a part of the eight V-shaped cuts 163a (the clock hand shown in FIG. 8B). 3 o'clock and 9 o'clock position cuts). When a part of the eight V-shaped cuts 163a formed on the inner peripheral surface of the zoom ring 163 is blocked, the zoom ring 163 is not deformed or deformed any more. Excessive deformation of the zoom ring 163 can be prevented, and breakage of parts and loss of grease can be prevented. Further, since the V-shaped cut 163a is filled with the grease 50, this also has an effect of preventing the grease from being cut.

  The V-shaped notches 163a formed on the inner peripheral surface of the zoom ring 163 may be formed so that the depth or number of the notches varies depending on the position of the photographing optical system in the optical axis direction. Good. According to this, the ease of elastic deformation of the zoom ring 163 can be varied depending on the position of the zoom ring 163 in the optical axis direction, and the zoom ring 163 can be deformed by adjusting the position where the zoom ring 163 is gripped. The amount (operation torque) can be adjusted.

[Others]
In the above embodiment, the case where the cameraman arbitrarily adjusts the operation torque of the zoom ring has been described. However, the present invention is not limited to this, and the operation torque of the focus ring 14 and the operation torque of the iris ring 18 can be adjusted in the same manner. In short, the present invention can be applied to any operation ring as long as the operation ring requires adjustment of the operation torque.

  Further, when these operation rings are switched to electric drive and driven, a pressing force that elastically deforms the operation ring does not act, so that the drive torque does not increase.

  Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 2 ... Cam cylinder, 5 ... Fixed ring, 12 ... Lens barrel, 14 ... Focus ring, 16, 161, 162, 163 ... Zoom ring, 163a ... Notch, 18 ... Iris ring, 50, 56 ... Grease, 56a ... Fine particle , 52, 54 ... Rubber ring

Claims (11)

A stationary ring, an optical member disposed inside the stationary ring, and an operation that is disposed concentrically on the outer peripheral surface of the stationary ring and operates the optical member by rotating with respect to the stationary ring. A lens device having a ring and filled with a lubricant between the stationary ring and the operation ring,
The operation ring is configured to be elastically deformed according to a gripping force grasped when the operation ring is operated, and changes a viscous resistance due to the lubricant by changing a thickness of a gap between the fixed ring and the operation ring. A lens device.   The lens device according to claim 1, wherein the operation ring is easily deformable depending on a position of the lens device in an optical axis direction.   The lens device according to claim 2, wherein the operation ring is configured so that a thickness thereof continuously changes corresponding to a position in the optical axis direction of the lens device.   The lens device according to claim 2, wherein the operation ring is configured so that a thickness thereof changes stepwise corresponding to a position of the lens device in an optical axis direction.   The ring member is made of an elastic member that is more easily elastically deformed than the operation ring, and covers the outer peripheral surface of the operation ring and covers the operation ring, and the outer diameter depends on the position in the optical axis direction. The lens device according to claim 3, further comprising a ring member that is substantially constant.   In the operation ring, a plurality of V-shaped cuts are formed at equal intervals on the inner peripheral surface of the operation ring, a part of the plurality of cuts is widened, and another part of the cut is formed. The lens device according to claim 1, wherein the lens device is deformed by being narrowed.   The operation ring has a different depth or number of the V-shaped cuts depending on a position of the lens device in the optical axis direction, and the ease of elastic deformation varies depending on the position of the lens device in the optical axis direction. Item 7. The lens device according to Item 6.   The lens apparatus according to claim 1, further comprising a deformation preventing unit that restricts deformation of the operation ring beyond a certain level.   9. The deformation preventing means according to claim 8, wherein the deformation preventing means is a lubricant filled in a gap between the stationary ring and the operation ring, and a fine particle kneaded for ensuring a minimum gap. Lens device.   The lens device according to claim 6 or 7, wherein the operation ring is restricted from being deformed to a certain extent or more by blocking a part of the plurality of V-shaped cuts.   The lens device according to any one of claims 1 to 10, wherein the optical member disposed inside the fixed ring is a focus lens, a zoom lens, or an iris.

Images