JP5651088B2 - Lens device - Google Patents

Description

  The present invention relates to a lens apparatus, and more particularly to a lens apparatus that manually adjusts zoom and the like.

  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.

  In Patent Document 1, a cam pin is provided in a holding ring that holds a moving lens, and this cam pin is slidably fitted in a straight advance groove of a fixed barrel and a cam groove of a cam barrel, and moves when the cam barrel rotates. A lens device for an ENG lens in which zooming is performed by moving the lens in the optical axis direction is described.

Japanese Patent Laid-Open No. 08-110455

  FIG. 11 is a development view of a cam cylinder in a conventional lens device for an ENG camera described in Patent Document 1. The cam groove 101 formed in the cam cylinder has a smaller angle θ (hereinafter referred to as a cam angle) of the cam groove 101 with respect to the circumferential direction of the cam cylinder 100 in the vicinity of the telephoto end. θ increases and the cam angle θ is about 40 ° at the wide end. In the vicinity of the wide end where the cam angle θ is large, the inertia becomes large and the moving lens is difficult to stop, so that there is a problem that desired stop accuracy cannot be obtained.

  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 easily stop a moving lens even in the vicinity of a wide end with a large inertia and improve the stopping accuracy.

In order to achieve the above object, a lens apparatus according to an aspect of the present invention includes a substantially cylindrical main body formed with a straight groove and a first long hole provided in the optical axis direction, and an interior of the main body. And a cam cylinder having a cam groove and a second elongated hole formed in parallel with the cam groove, and a cam cylinder inserted into the cam groove of the cam cylinder. And a moving frame in which a cam pin that engages with the rectilinear groove of the main body protrudes, and a pin that penetrates the first long hole and the second long hole protrudes, and a moving lens is provided. A moving frame that holds and moves the moving lens back and forth in the optical axis direction along the cam groove and the rectilinear groove as the cam cylinder rotates, and is disposed outside the main body, and the moving frame is near the wide end. A damper that provides resistance to the moving frame via the pin when the predetermined range is It is characterized in.

  According to the lens device according to one aspect of the present invention, the pin protruding from the moving frame passes through the second long hole formed in the cam groove and the first long hole formed in the main body. When the moving frame is in a predetermined range near the wide end, the damper applies resistance to the moving frame via this pin. Thereby, in a predetermined range near the wide end, the moving frame can be easily stopped by applying a braking force due to the viscous resistance using the rotary damper.

  In the lens device according to another aspect of the present invention, the predetermined range may be a range in which an angle of the cam groove with respect to a circumferential direction of the cam cylinder is approximately 40 ° to 50 °. That is, the predetermined range near the wide end may be a region where the cam is standing.

  In the lens device according to another aspect of the present invention, the predetermined range may be a range in which the amount of change in the angle of view with respect to the rotation of the cam cylinder is equal to or greater than a predetermined amount. That is, the predetermined range in the vicinity of the wide end may be a range in which the amount of change in the angle of view with respect to the rotation of the cam cylinder is equal to or greater than a predetermined amount.

  The lens device according to another aspect of the present invention includes a rack disposed outside the main body, and the rack has a hole in which the pin is fitted in a surface in contact with the main body, and is in contact with the main body. A gear is formed on a surface opposite to the surface, the damper is a rotary damper, a gear meshing with a gear formed on the rack is attached to the output shaft of the rotary damper, and the moving frame is near the wide end When the gear is within the predetermined range, a gear formed on the rack and a gear provided on the output shaft of the rotary damper may mesh with each other, thereby providing resistance to the moving frame. Thereby, when it exists in a predetermined range, a fixed resistance can always be provided to a moving frame.

  In the lens device according to another aspect of the present invention, the damper is a rotary damper, and an output shaft of the rotary damper is an arm whose longitudinal direction protrudes in the radial direction of the rotary damper, and the moving frame. Is attached to an arm in which the pin slides when the moving frame is moved from the tele side to the wide side, the distance between the pin and the output shaft of the rotary damper is It may be shortened. As a result, the viscous resistance applied to the moving frame can be increased as the moving frame approaches the wide end.

  In the lens device according to another aspect of the present invention, the first elongated hole may be formed substantially parallel to the rectilinear groove. Thereby, the pin can be moved in the optical axis direction.

  According to the present invention, the moving lens can be easily stopped even in the vicinity of the wide end where the inertia is large, and the stopping accuracy can be improved.

The top view which showed the external appearance of the ENG lens in 1st Embodiment to which this invention was applied Rear view showing the appearance of the ENG lens Cross section of the lens barrel viewed from the side 3 is an enlarged view of the main part of FIG. 3 is an enlarged view of the main part of FIG. Diagram showing cam groove shape Diagram showing change in angle of view The principal part enlarged view of the lens barrel of the ENG lens in 2nd Embodiment The principal part enlarged view of the lens barrel of the ENG lens in 2nd Embodiment Side view of the main part of the lens barrel Diagram showing cam groove shape

  Hereinafter, preferred embodiments of a lens apparatus according to the present invention will be described in detail with reference to the accompanying drawings. This lens apparatus is a lens apparatus that is mounted on a camera apparatus such as an ENG camera that is carried for broadcasting or business use during coverage.

<First Embodiment>
FIG. 1 and FIG. 2 are a plan view and a rear view of the lens apparatus, and mainly includes a lens barrel 1 and a drive unit 2. The lens barrel 1 can be attached to and detached from the camera body by a mount portion at the rear end.

  The lens barrel 1 holds therein a photographing optical system that collects subject light incident from the front side (object side) and forms a subject image on the imaging surface of the camera device. The photographing optical system mainly includes a focus lens (group), a zoom lens (group), a diaphragm, and a relay lens (group).

  The lens barrel 1 is provided with a rotatable focus ring 4, zoom ring 5, and iris ring 6 on the outer periphery, and an extender 3 is provided at the rear end of the lens barrel 1.

  When the focus ring 4 is rotated, the focus lens moves back and forth along the optical axis and the focus position changes. When the zoom ring 5 is rotated, the zoom lens moves back and forth along the optical axis and the focal length changes. When the iris ring 6 is rotated, the diaphragm opens and closes and the diaphragm value changes. The extender 3 can switch the image magnification between 1 × and 2 × by rotating a lever (not shown).

  A wide converter 7 that shifts the focal length of the photographing optical system to the wide angle side by a predetermined magnification is attached to the tip of the lens barrel 1 (left side in FIG. 1, subject side). The wide converter 7 is configured to be detachable from the lens barrel 1, and other front accessories can be attached instead of the wide converter 7.

  A drive unit 2 that drives the focus ring 4, the zoom ring 5, and the iris ring 6 is provided on the side of the lens barrel 1. The drive unit 2 has a case 20, and the case 20 is attached to the side of the lens barrel 1 via a screw 21.

  Each operation member for lens operation is provided on the outer surface of the case 20. On the upper surface of the case 20, an iris auto / manual mode switch 22, an iris momentary switch 23, a zoom seesaw control switch 24 (hereinafter referred to as a seesaw switch), a return switch 25, and the like are provided.

  The seesaw switch 24 is swingably installed with respect to the neutral position. When the seesaw switch 24 is pressed to the tele (T) side or the wide (W) side, the zoom ring 5 rotates to the tele side or the wide side. It is supposed to be. Further, the zoom speed can be adjusted by the pressing amount (operation amount) of the seesaw switch 24. The larger the pressing amount, the higher the zoom speed.

  A grip band 29 is provided on the side surface of the case 20, and the photographer can hold the lens barrel 1 by inserting the right hand (four fingers other than the thumb) into the grip band 29. Yes. Further, a VTR switch 26 and a quick zoom & constant speed auto zoom switch 27 are arranged on the rear surface of the case 20 (see FIG. 2), and these switches 26 and 27 can be operated by the photographer with the thumb of the right hand. Yes.

  A drive device is disposed in the case 20. The drive device has drive means for driving the zoom ring 5 and the iris ring 6, and a control board is disposed inside. The zoom lens 32 (detailed later) and the like are driven and controlled electrically by the seesaw switch 24, and the focus lens 36 (detailed later) and the iris diaphragm 40 (detailed later) are controlled. The driving means and the zoom ring 5 and the iris ring 6 are connected via a gear transmission mechanism (not shown), but each gear transmission mechanism is provided with a switching means, and the zoom ring 5 and the iris ring 6 are operated manually. Power is not transmitted to each motor.

  FIG. 3 is a cross-sectional view of the lens barrel 1 viewed from the side, and shows the upper half from the optical axis O. FIG. In FIG. 1, the lens barrel body of the lens apparatus 1 mainly includes a front frame 10, a front fixed ring 12, a first main body ring 14, a second main body ring 16, a rear fixed ring 18, a mount mounting frame 11, and a mount ring 13. It is comprised by the substantially cylindrical shape. The lens device 1 is mounted on a camera body with interchangeable lenses via a mount ring 13.

  The first main body ring 14 is an innermost component of the lens barrel main body. The front fixed ring 12 is fixed to the front side of the outer periphery of the first main body ring 14 with a screw, and the front of the front fixed ring 12 is in front. The frame 10 is fixed with screws. In addition, the second main body ring 16 is fixed by screws on the outer peripheral rear side of the first main body ring 14, the rear fixed ring 18 is positioned behind the second main body ring 16, and the mount mounting frame 11 is positioned behind the rear fixed ring 18, Mount rings 13 are fixed to the rear of the mount mounting frame 11 by screws.

  The optical system in the lens apparatus 1 includes, in order from the object side, a fixed lens (first group lens) 30, a zoom (variation) lens (second group lens) 32, a front master lens (third group lens) 34, a focus. It consists of five groups, a lens (fourth group lens) 36 and a rear master lens (fifth group lens) 38. In addition, an iris diaphragm 40 is provided immediately before the front master lens 34.

  The lens frame 42 to which the zoom lens 32 is attached is fixed to the moving frame 46 by a presser ring 44. A cam cylinder 48 is rotatably held on the inner peripheral portion of the first main body ring 14, and the moving frame 46 is held on the inner peripheral portion of the cam cylinder 48 via a cam pin 46A.

  That is, a rectilinear groove 14A in the direction of the optical axis O is formed on the inner peripheral surface of the first main body ring 14, and a cam groove (cam-shaped hole) 48A is formed in the cam cylinder 48. The cam pin 46 </ b> A fixed to is inserted into the cam groove 48 </ b> A of the cam cylinder 48 and engaged with the rectilinear groove 14 </ b> A of the first main body ring 14. As a result, the moving frame 46 is held so as to be able to advance straight in the direction of the optical axis O in a state where the rotation is restricted, and at the position where the cam pin 46A is engaged with the cam groove 48A.

  Therefore, when the cam cylinder 48 rotates, the intersection position of the cam groove 48A of the cam cylinder 48 and the rectilinear groove 14A of the first main body ring 14 changes to a position corresponding to the cam shape, and the cam pin 46A to the intersection position changes. Due to the movement, the moving frame 46 moves back and forth in the direction of the optical axis O.

Also, the first body ring 14 long hole 14B of the optical axis O direction is formed, a pin 46B projecting from the moving frame, the length Ana及 beauty was formed parallel to the cam groove 48A of the cam cylinder 48 The main body ring 14 is configured to be inserted through the long hole 14 </ b> B and receive a resistance force from the rotary damper 49. This configuration will be described in detail later.

  On the other hand, the zoom ring 5 is rotatably disposed on the outer peripheral portion of the second main body ring 16, and a rod-shaped connecting shaft 52 is attached radially inward of the inner peripheral surface of the zoom ring 5. . The connecting shaft 52 is connected to the cam cylinder 48 through a long hole (not shown) in the circumferential direction formed in the first main body ring 14. As a result, when the zoom ring 5 is rotated, the cam cylinder 48 is rotated in conjunction therewith. When the cam cylinder 48 rotates, the moving frame 46 moves forward and backward as described above, and the zoom lens 32 moves in the direction of the optical axis O in conjunction with the moving frame 46. Therefore, the zoom magnification is changed by the rotation operation of the zoom ring 5.

  The iris diaphragm 40 is mainly configured by a plastic base plate (aperture frame) 54, a chrysanthemum seat (cam plate) 56, and a plurality of diaphragm blades 58 disposed between the diaphragm frame 54 and the cam plate 56. ing. An iris ring 6 is rotatably disposed between the rear fixed ring 18 and the mount mounting frame 11, and a connecting shaft 56 </ b> A extending from the cam plate 56 is connected to the iris ring 6. As a result, the cam plate 56 is rotated by the rotation of the iris ring 6, and the aperture blade 58 is opened and closed.

  The focus lens 36 changes the focal position of the optical system, and includes a holding frame 62 that holds the front master lens 34 and the like, and a lens frame 64 of the rear master lens 38 that is disposed at the rear end of the holding frame 62. Are supported so as to be movable in the direction of the optical axis O by a guide shaft and a detent (not shown) held between them. The holding frame 62 is provided with a pair of voice coil motors (VCM) 66 with a guide shaft interposed therebetween, and the focus lens 36 is electrically driven by the power of the VCM 66.

  A first focus ring 4 </ b> A and a second focus ring 4 </ b> B are rotatably disposed on the outer peripheral portion of the front fixed ring 12. The first focus ring 4A is not restricted in the rotation range, can be rotated endlessly, and is slidable in the optical axis direction. The second focus ring 4B is restricted by the stopper shaft 74 so that it can be rotated within a range of about 120 degrees.

  Sawtooth-shaped clutch portions 70A and 72A are formed on the end faces where the first focus ring 4A and the second focus ring 4B face each other. In the state shown in FIG. 1, the clutch portions 70A and 72A are connected (engaged). Then, the first focus ring 4A and the second focus ring 4B rotate integrally. Accordingly, when the first focus ring 4A is manually rotated in this state, it can be rotated only within a range of about 120 degrees.

  On the other hand, when the first focus ring 4A is slid forward so as to get over the click elastic member 76, the clutch portions 70A and 72A are disconnected. Thus, the first focus ring 4A can be rotated endlessly.

  In the present embodiment, the cam cylinder 48 is configured to receive a resistance force from the rotary damper 49. The configuration will be described with reference to FIGS.

  4 and 5 are partial cross-sectional views of the inside of the lens barrel 1 when the lens barrel 1 is cut along the long hole 14B. FIG. 4 shows a state in which the gear 47A and the gear 49A (described later) start to mesh with each other, and FIG. 5 shows a state in which the zoom lens 32 is at the wide end. The long hole 14 </ b> B is a long hole formed in the first main body ring 14 in the optical axis O direction.

  A pin 46B protrudes from the moving frame 46 adjacent to the cam pin 46A. The pin 46 </ b> B protrudes from the first main body ring 14 through the long hole formed in parallel with the cam groove 48 </ b> A of the cam cylinder 48 and the long hole 14 of the first main body ring 14.

  A rack 47 is disposed on a portion of the pin 46B protruding from the first main body ring 14. The rack 47 is a substantially prismatic member, and a hole 47 </ b> B is formed on a surface in contact with the first main body ring 14. The pins 46B and the rack 47 are integrated by fitting the pins 46B into the holes 47B.

  The surface of the rack 47 that contacts the first main body ring 14 is formed with the same curvature as the outer periphery of the first main body ring 14 so that the rack 47 can slide along the outer periphery of the first main body ring 14. A gear 47A is formed on the surface of the rack 47 opposite to the surface in contact with the first main body ring 14.

  A rotary damper 49 is disposed on the outer peripheral surface of the first main body ring 14. The rotary damper 49 is provided with a rotor inside a case filled with oil, and when the rotor rotates, a braking force (brake) is applied by the viscous resistance of the oil. The rotor rotates clockwise and counterclockwise. This is a bi-directional rotary damper that generates braking force when rotating in either direction.

  A gear 49A is press-fitted into the output shaft of the rotary damper 49 (the output shaft of the rotor). The gear 49A is formed so as to be able to mesh with the gear 47A.

  FIG. 6 is a developed view of the cam cylinder 48 to show the shape of the cam groove 48A. The rotary damper 49 is arranged so that the gear 47A and the gear 49A mesh with each other (the state shown in FIG. 4) when the cam pin 46A comes to the position of the cam groove 48A in FIG. 6a. That is, when the moving frame 46 reaches the position shown in FIG. 4, a braking force due to viscous resistance starts to act on the moving frame 46.

  When the zoom ring 5 is rotated from the state shown in FIG. 4, the cam cylinder 48 is rotated in conjunction therewith, and the zoom lens 32 moves in the wide end direction. When the cam pin 46A comes to the position of the cam groove 48A shown in FIG. 6b, the movement of the moving frame 46 stops and the state shown in FIG. 5 is obtained.

  That is, while the moving frame 46 moves from the state shown in FIG. 4 to the state shown in FIG. 5 (that is, while the cam pin 46A is in the position of FIG. 6c of the cam groove 48A), the gears 47A and 49A continue to mesh. That is, a braking force due to viscous resistance continues to act on the moving frame 46.

  As shown in FIG. 6, the cam groove 48A formed in the cam cylinder 48 has a small angle θ (hereinafter referred to as cam angle) of the cam groove 48A with respect to the circumferential direction of the cam cylinder 48 in the vicinity of the tele end (cam angle). However, in the range of FIG. 6c in which the gears 47A and 49A mesh with each other, the cam angle θ is approximately 40 ° to 50 °. It becomes. The range of FIG. 6c is a range in which the rotation angle of the cam barrel 48 is approximately 85 ° to 90 ° when the tele end is 0 ° and the wide end is 90 °. In this way, in the range where the cam angle θ near the wide end is large, inertia is increased and the moving frame 46 is difficult to stop. Therefore, the moving frame 46 is stopped by applying a braking force by the rotary damper 49 to the moving frame 46. Make it easier to do. Thereby, desired stop accuracy can be obtained.

  FIG. 7 is a diagram illustrating the relationship between the position of the moving frame 46 and the change in the angle of view. The horizontal axis in FIG. 7 is the rotation angle of the cam cylinder 48 when the tele end is 0 ° and the wide end is 90 °, and the vertical axis is the amount of change in the angle of view when the cam cylinder 48 rotates 1 °. It is. As shown in FIG. 7, a range d corresponding to FIG. 6 c is a range in which the amount of change in the angle of view due to the rotation of the cam cylinder 48 is large. Thus, the range in which the cam angle θ is large and the moving frame 46 is difficult to stop is the range in which the angle of view changes greatly when the cam cylinder 48 rotates slightly, that is, the amount of change in the angle of view with respect to the rotation of the cam cylinder is a predetermined amount or more This is the range. Therefore, by making it easier to stop the moving frame 46 in this region, it is possible to prevent the angle of view from changing unnecessarily.

  According to the present embodiment, in the region where the cam stands, the moving frame can be easily stopped by applying the braking force due to the viscous resistance using the rotary damper.

  In this embodiment, the rack 47 is moved in the optical axis direction, and the gear 49A of the rotary damper 49 and the gear 47A of the rack 47 are engaged in the vicinity of the wide end, but the movement direction of the rack is the optical axis direction. Not limited to. The rack may be rotated in accordance with the rotation of the cam cylinder, and the gear of the rotary damper and the gear of the rack may be engaged in the vicinity of the wide end. In this case, a pin may be protruded from the cam cylinder 48 instead of the pin 46B, and a long hole formed in parallel with the cam groove 48A may be passed through the first main body ring 14. Further, the rotary damper 49 may be disposed on the first main body ring 14 so that the output shaft of the rotary damper 49 is orthogonal to the cam groove 48A.

<Second Embodiment>
In the first embodiment, the rack 47 is moved in the optical axis direction, and the gear attached to the output shaft of the rotary damper and the gear of the rack are engaged in the vicinity of the wide end, so that the moving frame is controlled by viscous resistance. Although the power is applied, the method of applying the braking force by the viscous resistance to the moving frame is not limited to this.

  In the second embodiment of the present invention, an arm is attached to the output shaft of the rotary damper, and a braking force due to viscous resistance is applied to the moving frame via the arm. Hereinafter, a lens device according to the second embodiment will be described. Since the drive unit 2 is the same as that of the first embodiment, the description thereof is omitted, and only the lens barrel 1-1 is described. Further, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  8 and 9 are partial cross-sectional views of the lens barrel 1-1. FIG. 8 shows a state where the cam pin 46A has reached the position of FIG. 6a of the cam groove 48A. FIG. Indicates the state at the wide end. FIG. 10 is a view of the main part of the lens barrel 1-1 as seen along the optical axis.

  A rotary damper 49 is disposed on the outer peripheral surface of the first main body ring 14. An arm 49B is press-fitted into the output shaft of the rotary damper 49 (the output shaft of the rotor) so that the longitudinal direction protrudes in the radial direction of the rotary damper 49.

  The arm 49B has a generally square shape with its tip bent, and a pin 49C projects from the tip. One end of a spring 49E is attached to the pin 49C. The other end of the spring 49E is attached to a pin 14D projecting from the first main body ring 14. Therefore, a force that rotates the arm 49B counterclockwise in FIGS. 8 and 9 is urged by the spring 49E to the arm 49B. The first body ring 14 is provided with a fixing pin 14C, and the rotation of the arm 49B to which the counterclockwise rotational force is urged by the spring 49E is restricted. At the position where the rotation of the arm 49B is restricted, the arm 49B is formed so that the tip of the arm 49B is substantially parallel to the optical axis. Therefore, the pin 46B moving in the optical axis direction is guided to the long hole 49D.

  The arm 49B is formed with a long hole 49D having one end opened along the longitudinal direction from the tip. The pin 46B slides in the long hole 49D. As shown in FIG. 8, when the cam pin 46A comes to the position of the cam groove 48A in FIG. 6a, the pin 46B is moved from the tip of the long hole 49D of the arm 49B to the position where the arm 49B in the long hole 49D is bent. . While the pin 46B moves from the end of the long hole 49D to the position where the arm 49B bends, the direction of the long hole 49D and the direction of movement of the pin 44B are substantially parallel. Therefore, viscous resistance is not affected.

  While the cam cylinder 48 rotates and the moving frame 46 moves in the wide end direction from the state shown in FIG. 8, the pin 46B pushes the arm 49B clockwise (direction in FIGS. 8 and 9) while moving in the optical axis direction ( 8 and 9, the pin 46B reaches the wide end at the position shown in FIG. 9, and the pin 46B stops.

  The pin 46B rotates the arm 49B while sliding in the elongated hole 49D in a direction approaching the output shaft of the rotary damper 49. As the distance between the pin 46B and the output shaft of the rotary damper 49 becomes shorter, the viscous resistance applied to the pin 46B, that is, the moving frame 46, increases. With such a configuration, the viscosity resistance applied to the moving frame 46 can be increased as it approaches the wide end where the inertia is larger.

  When the moving frame 46 moves from the wide end to the tele end direction, that is, when the pin 46B moves rightward in FIGS. 8 and 9, viscous resistance is not applied to the pin 46B by the urging force of the spring 49E. As the pin 46B moves in the optical axis direction, the arm 49B rotates counterclockwise in FIGS. 8 and 9 until it comes into contact with the determination pin 14C.

  According to the present embodiment, it is possible to increase the viscous resistance applied to the moving frame as the inertia increases. Therefore, it is possible to make it easier to stop the moving end. Note that as the camcorder approaches the wide end, the change in the angle of view with respect to the rotation of the cam cylinder increases (see FIG. 7). Thus, by increasing the viscous resistance applied to the moving frame as the change in the angle of view increases, it is possible to prevent the angle of view from changing unintentionally.

  In this embodiment, the pin 46B is moved in the optical axis direction and meshed with the arm 49B. However, as in the first embodiment, the pin and the arm are rotated by rotating the pin in accordance with the rotation of the cam cylinder. May be engaged with each other.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Lens barrel, 2 ... Drive unit, 3 ... Extender, 4 ... Focus ring, 5 ... Zoom ring, 6 ... Iris ring, 7 ... Wide converter, 14 ... 1st main body ring, 46 ... Moving frame 46, 46A ... Cam pin, 46B ... pin, 47 ... rack, 47A ... gear, 48 ... cam barrel, 48A ... cam groove, 49 ... rotary damper, 49A ... gear, 49B ... arm

Claims (6)

A substantially cylindrical main body formed with a straight groove and a first elongated hole provided in the optical axis direction ;
A cam cylinder rotatably disposed inside the main body, the cam cylinder having a cam groove and a second elongated hole formed in parallel with the cam groove ;
A cam pin that is inserted into the cam groove of the cam cylinder and engages with the rectilinear groove of the main body protrudes, and a pin that penetrates the first long hole and the second long hole protrudes. A moving frame that holds the moving lens and moves the moving lens back and forth in the optical axis direction along the cam groove and the rectilinear groove as the cam cylinder rotates.
A damper disposed on the outside of the main body and providing resistance to the moving frame via the pin when the moving frame is in a predetermined range near a wide end;
A lens device comprising:   2. The lens device according to claim 1, wherein the predetermined range is a range in which an angle of the cam groove with respect to a circumferential direction of the cam cylinder is approximately 40 ° to 50 °.   The lens apparatus according to claim 1, wherein the predetermined range is a range in which a change amount of an angle of view with respect to the rotation of the cam cylinder is a predetermined amount or more. A rack disposed outside the main body,
The rack is formed with a hole into which the pin is fitted on a surface in contact with the main body, and a gear is formed on a surface opposite to the surface in contact with the main body,
The damper is a rotary damper,
A gear meshing with a gear formed on the rack is attached to the output shaft of the rotary damper,
When the moving frame is in a predetermined range near the wide end, a gear formed on the rack and a gear provided on the output shaft of the rotary damper mesh with each other to provide resistance to the moving frame. The lens apparatus according to claim 1, 2, or 3. The damper is a rotary damper,
The output shaft of the rotary damper is attached with an arm whose longitudinal direction protrudes in the radial direction of the rotary damper, and the pin slides when the moving frame is in a predetermined range near the wide end. And
4. The lens device according to claim 1, wherein the distance between the pin and the output shaft of the rotary damper is shortened when the moving frame is moved from the tele side to the wide side.   The lens device according to claim 1, wherein the first long hole is formed substantially parallel to the rectilinear groove.

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