JP2011048080A - Lens device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens device easily adjusting the eccentricity of a lens. <P>SOLUTION: The lens device has: a lens frame to which the lens is attached; a guide shaft which is fitted to the lens frame so as to be freely slidable to guide the movement of the lens frame in an axial direction; an eccentric bearing including a guide shaft insertion hole into which the leading end of the guide shaft is inserted; and a holding member which holds the eccentric bearing. The center axis of the guide shaft insertion hole is eccentric with respect to the center axis of the eccentric bearing. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a lens apparatus, and more particularly to a lens eccentricity adjusting structure.

  2. Description of the Related Art Conventionally, as a lens device used for a portable ENG (Electronic News Gathering) camera used for TV coverage or the like, an inner focus type lens device and a rear focus type lens device are known (Patent Documents 1 to 3). 3).

  The movable lens of such a lens device is, for example, as shown in Patent Document 3, the lens frame is guided by the guide shaft in the optical axis direction by the power of the VCM, and moves forward and backward, so that the optical axis direction is interlocked with it. It is supposed to move forward and backward.

Japanese Patent Laid-Open No. 9-211303 JP 2007-148021 A JP 2007-102106 A

  In assembling such a lens apparatus, it is necessary to adjust the eccentricity of a movable lens such as a focus lens because it greatly contributes to the optical performance of the entire lens barrel.

  However, conventionally, as shown in Patent Document 3, for example, the movable lens is guided and moved back and forth by the guide shaft fitted in the bearing hole of the lens frame. Depending on the condition, it was difficult to adjust the eccentricity.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a lens device capable of easily adjusting the eccentricity of a lens.

  In order to achieve the above object, a lens device of the present invention includes a lens frame to which a lens is attached, a guide shaft that slidably fits with the lens frame and guides the movement of the lens frame in the axial direction, An eccentric bearing having a guide shaft insertion hole into which a distal end of the guide shaft is inserted, and a holding member that holds the eccentric bearing, and a central axis of the guide shaft insertion hole is a center of the eccentric bearing It is characterized by being eccentric with respect to the shaft.

  According to the present invention, since the central axis of the guide shaft insertion hole is eccentric with respect to the central axis of the eccentric bearing, it is possible to easily adjust the eccentricity of the lens.

  As an aspect of the present invention, the eccentric bearing comprises a knurled portion that is knurled on an outer peripheral portion.

  According to this aspect, the eccentric bearing can be easily rotated by hooking the jig on the knurled portion.

  As one aspect of the present invention, the holding member includes a bearing hole into which the eccentric bearing is press-fitted, and the bearing hole is formed with a diameter that allows the eccentric bearing to rotate after the eccentric bearing is press-fitted. It is characterized by that.

  According to this aspect, since the bearing hole is formed with a diameter that allows the eccentric bearing to rotate after the eccentric bearing is press-fitted, the eccentric bearing is unlikely to be detached from the holding member and can be rotated.

  As one aspect of the present invention, an outer peripheral member covering the holding member is provided, and the outer peripheral member includes an adjustment hole provided at a position corresponding to the eccentric bearing when the holding member is covered. Features.

  According to this aspect, the eccentric bearing can be easily rotated from the adjustment hole.

  As an aspect of the present invention, the lens is a focus lens.

  According to the present invention, it is possible to easily adjust the eccentricity of the lens.

It is sectional drawing which looked at the lens apparatus based on this invention from the side surface. It is an external perspective view of a rear master lens, a lens frame, a holding frame, and the like. It is an external perspective view of a focus lens, a voice coil motor (VCM), a lens frame, a guide shaft, and the like. It is sectional drawing of the lens apparatus which looked at the periphery of the focus lens from the side. It is an expanded sectional view of the periphery of the eccentric bearing in FIG. It is sectional drawing of an eccentric bearing. It is an external appearance perspective view of the periphery of a mount ring.

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

[Entire configuration of lens device]
FIG. 1 is a sectional view of a rear focus type variable focal length lens device applied to the present invention applied to, for example, a consumer video camera, a television broadcast ENG camera, a surveillance camera, etc., as viewed from the side. Yes, with respect to the upper half from the optical axis O.

  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 20, and a mount ring 22. It is comprised by the substantially cylindrical shape.

  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. Further, the second main body ring 16 is fixed to the rear side of the outer periphery of the first main body ring 14 with a screw, the rear fixed ring 18 is located behind the second main body ring 16, the mount mounting frame 20 is located behind the rear fixed ring 18, Mount rings 22 are fixed to the rear of the mount mounting frame 20 with screws.

  A lens hood 24 can be attached to the front frame 10. The lens device 1 is mounted on a camera body with interchangeable lenses via a mount ring 22.

  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.

  On the other hand, a zoom ring 50 is rotatably disposed on the outer peripheral portion of the second main body ring 16, and a rod-like connecting shaft 52 is attached radially inward of the inner peripheral surface of the zoom ring 50. . 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 50 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. Accordingly, the zoom magnification is changed by rotating the zoom ring 50.

  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 60 is rotatably disposed between the rear fixed ring 18 and the mount mounting frame 20, and a connecting shaft 56 </ b> A extending from the cam plate 56 is connected to the iris ring 60. Thus, the cam plate 56 is rotated by the rotation of the iris ring 60, 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 70 and a second focus ring 72 are rotatably arranged on the outer peripheral portion of the front fixed ring 12. The rotation range of the first focus ring 70 is not restricted, and the first focus ring 70 can be rotated endlessly and is slidable in the optical axis direction. Further, the second focus ring 72 is restricted by a stopper shaft 74 so as to be rotatable 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 70 and the second focus ring 72 face each other. In the state shown in FIG. 1, the clutch portions 70A and 72A are connected (engaged). Then, the first focus ring 70 and the second focus ring 72 rotate integrally. Therefore, in this state, when the first focus ring 70 is manually rotated, it can be rotated only within a range of about 120 degrees.

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

  A drive unit (not shown) that also serves as a grip unit is attached to the side surface of the lens device 1 having the above configuration via screw holes 80 and 82.

  The drive unit includes a drive unit for driving the zoom ring 50 and the iris ring 60, and a control board is disposed inside, and the zoom lens 32 and the like are driven and controlled electrically by a seesaw type zoom switch, and the focus is adjusted. The lens 36 and the iris diaphragm 40 are controlled.

<Various detection means>
A linear potentiometer is disposed on the outer peripheral surface of the first main body ring 14 along the optical axis direction. In the linear potentiometer (zoom linear POT), the zoom lens 32 is moved in the optical axis direction by the rotation of the cam cylinder 48. When it moves, a position signal (signal indicating an absolute position) corresponding to the moving position is output to the drive unit via the lead wire.

  A magnetic ring 84 with N and S poles magnetized is bonded to the rear end surface of the cam cylinder 48, and a magnetic sensor (MR sensor) is opposed to the magnetic ring 84 on the first body ring 14. Is arranged. When the magnetic ring 84 rotates together with the cam cylinder 48, the MR sensor outputs a pulse signal (a signal indicating a relative position) having the number of pulses corresponding to the rotation amount to the drive unit via the lead wire.

  The output of the zoom linear POT is used when the power is turned on, and thereafter, the output of the MR sensor for detecting the zoom position is used.

  The holding frame 62 facing the guide shaft of the focus lens 36 is provided with an MR sensor for detecting the focus lens position. This MR sensor has a pulse signal (number of pulses corresponding to the amount of movement of the focus lens 36). A signal indicating a relative position) is output to the drive unit via the lead wire. In addition, a home position sensor (photo interrupter) for detecting the reference position of the focus lens 36 is disposed in the holding frame 62, and the drive unit determines the reference position of the focus lens 36 detected by the home position sensor. The absolute position of the focus lens 36 is detected by counting the output signal of the MR sensor with reference.

  Gears 70B and 72B are formed around the first focus ring 70 and the second focus ring 72, respectively, and these gears 70B and 72B are respectively relative position detection type sensors (incremental) provided on the drive unit side. Encoder), and a detection shaft gear of an absolute position detection type sensor (absolute encoder).

  Accordingly, the drive unit can detect the relative rotation amount of the first focus ring 70 and can detect the absolute rotation position of the second focus ring 72.

  In addition, a photo interrupter 86 is provided at the front end of the front fixed ring 12, while a light shielding plate 70 </ b> C is provided at the front end of the first focus ring 70. The photo interrupter 86 outputs a detection signal indicating the presence or absence of the light shielding plate 70C to the drive unit. Accordingly, the driving unit can detect whether or not the first focus ring 70 is connected to the second focus ring 72 based on the detection signal from the photo interrupter 86.

[Lens control]
A slide-type macro ON / OFF switch, an AF / MF switching switch, and a non-locking AF push switch are disposed on the side surface of the mount mounting frame 20, and output signals associated with the operation of these switches. Is added to the drive unit via a lead wire.

  Here, the macro ON / OFF switch is a switch for turning on / off the macro photographing mode. The AF / MF selector switch manually rotates the first focus ring and an auto focus (AF) mode in which the focus lens 36 is automatically moved to adjust the focus so that the contrast of the subject image is maximized. This is a switch for switching the manual focus (MF) mode in which the focus lens 36 is moved to adjust the focus. The AF push switch is a switch that switches to the AF mode only during a period when the key top is pressed (pushed) when the AF / MF switch is switched to the MF mode.

<Focus control>
When the AF mode is switched to the AF mode by the AF / MF switch, the drive unit automatically moves the focus lens 36 to the in-focus position regardless of the operation of the first focus ring 70 and the second focus ring 72. AF control is performed.

  On the other hand, when the AF / MF switch is switched to the MF mode, the full MF mode (with end) and the AF / MF mode (endless) are switched according to the slide position of the first focus ring 70. It is like that.

  That is, the drive unit can detect the slide position of the first focus ring 70 (whether the first focus ring 70 is connected to the second focus ring 72) based on the detection signal from the photo interrupter 86 described above. When the first focus ring 70 is connected to the second focus ring 72, the mode is switched to the full MF mode. When the first focus ring 70 is not connected to the second focus ring 72, the AF / MF mode is set. Switch.

  In the full MF mode in which the first focus ring 70 is connected to the second focus ring 72, the drive unit detects the absolute position signal (closest distance) from the absolute position detection type sensor connected to the gear 72B of the second focus ring 72. Signal indicating the absolute position of the zoom position obtained from the output of the zoom linear POT when the power is turned on and the output of the MR sensor for detecting the zoom position thereafter. The focus lens 36 is driven and controlled based on the signal indicating the magnification. That is, the position to which the focus lens 36 should move corresponding to the shooting distance is set in advance according to the current zoom position (zoom magnification) of the zoom lens 32, and the drive unit manually operates the first focus ring 70. When the second focus ring 72 is rotated in conjunction with this, the focus lens 36 is moved to a corresponding position based on a signal indicating the rotation position (signal for instructing the shooting distance) and the current zoom magnification.

  When the mode is switched to the full MF mode in this way, the focus lens 36 can be moved to a position corresponding to a desired shooting distance by manually operating the first focus ring 70. Since the first focus ring 70 is connected to the second focus ring 72 with an end whose rotation range is restricted by the stopper shaft 74, the rotation range is restricted similarly to the second focus ring 72. Thus, it can be rotated within a rotation range corresponding to the infinity end from the closest end.

  In the full MF mode, the rotation range of the first focus ring 70 is limited via the second focus ring 72, and the operator can adjust the focus lens according to the operation feeling when the first focus ring 70 reaches the end. It can be recognized that 36 has reached the near end or the infinity end. Such a focus operation using only the first focus ring 70 is a method familiar to professional photographers and the like.

  On the other hand, in the AF / MF mode in which the first focus ring 70 is not connected to the second focus ring 72, the MF mode in which the focus lens 36 is moved by rotating the first focus ring 70, and the AF push switch described above. Focus control can be performed by properly using the AF mode by pressing the button.

  That is, when the first focus ring 70 is operated in the AF / MF mode and a relative position signal is input from the relative position detection type sensor connected to the gear 70B of the first focus ring 70, the driving unit receives the relative position. The focus lens 36 is driven and controlled based on the signal, and the focus lens 36 is moved by an amount corresponding to the amount of rotation of the first focus ring 70.

  In the AF / MF mode, since the first focus ring 70 is not connected to the second focus ring 72, the rotation range thereof is not restricted, and the end lens can be rotated endlessly. When moving to the position of the end or the closest end, a movement command exceeding the end is not output.

  In addition, when the AF push switch is pressed during AF / MF mode, the AF lens is temporarily switched to AF mode. After that, when the AF push switch is released to switch to MF mode, the focus lens 36 automatically focused by the AF mode is switched. By taking over the position, the focus lens 36 can be displaced by the amount of operation of the first focus ring 70, which improves usability.

<Zoom control>
When a seesaw-type zoom switch provided in the drive unit is operated, a rotational driving force is transmitted from an electric motor in the drive unit to a gear 50A formed around the zoom ring 50, thereby rotating the zoom ring 50. It can be made to. Further, the zoom ring 50 can be rotated by manually operating the zoom ring 50 (a zoom lever (not shown) implanted in the zoom ring 50).

  When the zoom ring 50 rotates, the cam cylinder 48 connected via the connecting shaft 52 rotates, and when the cam cylinder 48 rotates, the rectilinear groove 14A formed in the first main body ring 14 and the cam cylinder. The moving frame 46 moves back and forth in the direction of the optical axis O via the cam pin 46A engaged with the cam groove 48A. When the zoom ring 50 is thus rotated, the zoom lens 32 can be moved in the direction of the optical axis O, and the zoom magnification can be changed.

  When the zoom magnification changes due to the movement of the zoom lens 32 as described above, the focal plane moves. However, the drive unit also uses the focus lens 36 as a correction optical system that corrects the movement of the focal plane accompanying the change in the zoom magnification. The position of the focus lens 36 is controlled so that the focal plane does not move regardless of the zoom magnification.

  That is, the drive unit obtains the current zoom position of the zoom lens 32 before the zoom operation from the output of the zoom linear POT when the power is turned on and the output of the MR sensor for detecting the zoom position thereafter, and the current focus lens. The position of 36 is acquired from the MR sensor for detecting the focus lens position, and the acquired zoom position is obtained from a correction curve indicating the relationship between the zoom position where the focal plane prepared in advance for each shooting distance is not moved and the focus lens position. When a corresponding correction curve is selected based on the focus lens position and then the amount of movement of the zoom lens 32 is detected based on the output signal of the MR sensor for detecting the zoom lens position, the detected zoom position is detected. The focus lens position (focus lens position that does not move the focal plane) corresponding to Read from the curve, and moves the focus lens 36 to the read focus lens position.

  As a result, the focus plane is adjusted by the focus control so that the focal plane is positioned on the image pickup device of the camera body on which the lens apparatus 1 is mounted. Can not be shifted).

  This prevents the focal plane from moving even when the zoom magnification is changed. Therefore, once focus adjustment is performed so that the focal plane is positioned on the image pickup device of the camera body on which the lens apparatus 1 is mounted by focus control, it is possible to prevent the focus from being shifted even after zooming.

[Embodiment]
Next, the lens eccentricity adjusting mechanism applied to the lens apparatus 1 having the above configuration will be described in detail.

FIG. 2 is an external perspective view of the rear master lens 38, the lens frame 64, the holding frame 62, and the like.
As shown in FIG. 2, the lens frame 64 is a holding member for an eccentric bearing 88 described later, and the eccentric bearing 88 is held on the surface of the lens frame 64 on the side where the mount ring 22 is located.

  3 shows a state in which the lens frame 64 to which the rear master lens 38 is attached, the holding frame 62, the eccentric bearing 88, and the like are removed from the external perspective view of FIG. 2, and the focus lens 36, voice coil motor (VCM). 66, an external perspective view of the lens frame 90, the guide shaft 92, and the like. As shown in FIG. 3, voice coil motors (VCM) 66 are provided on both sides of a guide shaft 92 that is slidably fitted to the lens frame 90 of the focus lens 36.

  FIG. 4 is a cross-sectional view of the lens apparatus 1 when the periphery of the focus lens 36 is viewed from the side. 4 shows a state in which a collimator jig 96 is attached to the mount ring 22 by a mount fastening ring 94 in order to adjust the optical axis of the lens. FIG. 5 is an enlarged cross-sectional view of the periphery of the eccentric bearing 88 in FIG.

  As shown in FIG. 4, a guide shaft 92 is slidably fitted to the lens frame 90 of the focus lens 36. The focus lens 36 is movable in the direction of the optical axis O along the guide shaft 92 by being electrically driven by the power of the VCM 66.

  As shown in FIG. 5, the front end of the guide shaft 92 is inserted into the bearing hole 98 of the lens frame 64 of the rear master lens 38, and the front end of the guide shaft 92 is fitted in a substantially cylindrical shape so as to be fitted into the bearing hole 98. The eccentric bearing 88 is attached. The mount ring 22 is provided with an adjustment hole 112 as will be described in detail later.

  The holding frame 62 facing the guide shaft 92 of the focus lens 36 is provided with a base 102 to which the MR sensor 100 for detecting the focus lens position is attached. The MR sensor 100 outputs a pulse signal (a signal indicating a relative position) having the number of pulses corresponding to the movement amount of the focus lens 36 to the drive unit via a lead wire.

  The mount ring 22 is an outer peripheral member that covers the outer peripheral side of the lens frame 64 of the rear master lens 38, and is fixed to the rear of the mount mounting frame 20 with screws.

  The mount tightening ring 94 is fixed to the mount ring 22 by rotating the lever 104 with the lever 104 to fit the bayonet claw portion 108 of the mount ring 22, thereby attaching the collimator jig 96 to the lens device 1. Can do. The collimator jig 96 is attached to the mount ring 22 after the lens is assembled in the lens barrel, and is used for adjusting the optical axis so as to increase the resolution level by observing the imaging state (image quality) of the lens. It is a tool.

  FIG. 6 is a cross-sectional view of the eccentric bearing 88. As shown in FIG. 6, the eccentric bearing 88 includes an insertion portion 88A that is a portion that is inserted into the bearing hole 98 of the lens frame 64 and a knurling portion 88B that is a portion that has been knurled.

  The diameter of the knurled portion 88B is formed larger than the diameter of the insertion portion 88A and the diameter of the bearing hole 98 of the lens frame 64. Therefore, when the insertion portion 88A is inserted into the bearing hole 98 of the lens frame 64, the knurled portion 88B is brought into contact with the surface of the lens frame 64 without being inserted into the bearing hole 98 of the lens frame 64.

  Further, the width in the optical axis O direction of the knurled portion 88B of the eccentric bearing 88 has a width that fits between the mount ring 22 and the lens frame 64 in a state where the mount ring 22 is mounted on the mount mounting frame 20. ing. Thereby, since the eccentric bearing 88 is not in contact with the mount ring 22 in a state where it is attached to the lens frame 64, the eccentric bearing 88 can be rotated.

  In addition, the width of the insertion portion 88 </ b> A in the optical axis O direction in the eccentric bearing 88 is desirably larger than the width between the mount ring 22 and the lens frame 64 when the mount ring 22 is attached to the mount attachment frame 20. . As a result, even if the insertion portion 88A of the eccentric bearing 88 comes off the bearing hole 98 of the lens frame 64, the eccentric bearing 88 does not come off the lens frame 64.

  The dimensional relationship between the diameter of the bearing hole 98 of the lens frame 64 and the diameter of the insertion portion 88A of the eccentric bearing 88 is such that the insertion portion 88A of the eccentric bearing 88 is press-fitted into the bearing hole 98 of the lens frame 64, and It is desirable that the dimensional relationship be such that the eccentric bearing 88 can be rotated later. Thereby, the eccentric bearing 88 is difficult to be detached from the lens frame 64 and can be rotated.

  Further, as shown in FIG. 6, the eccentric bearing 88 is provided with a guide shaft insertion hole 110 that is a hole into which the tip of the guide shaft 92 is inserted. The position of the center line α of the guide shaft insertion hole 110 is eccentric from the position of the center line β of the eccentric bearing 88 in the radial direction. Therefore, when the eccentric bearing 88 is rotated, the center line of the guide shaft insertion hole 110 moves in the radial direction, so that the guide shaft 92 whose tip is inserted into the guide shaft insertion hole 110 can be eccentric in the radial direction. .

  FIG. 7 is an external perspective view of the periphery of the mount ring 22. As shown in FIG. 7, an adjustment hole 112 that is a through hole is provided on the side surface of the mount ring 22. This adjustment hole 112 corresponds to the eccentric bearing 88 when the mount ring 22 is attached to the mount mounting frame 20 and covers the outer peripheral side of the lens frame 64 of the rear master lens 38 (see the eccentric bearing 88). Is provided).

  The eccentric bearing 88 can be rotated by inserting, for example, a rod-shaped jig from the adjustment hole 112 and hooking it on the knurled portion 88B of the eccentric bearing 88. Thereby, the eccentricity of the focus lens 36 can be adjusted by decentering the guide shaft 92. Therefore, the eccentricity of the focus lens 36 can be adjusted by decentering the guide shaft 92 while observing the measurement value or image on the measuring instrument (MTF measuring instrument or collimator).

  After the adjustment, the focus lens 36 can be fixed at the eccentricity adjustment position by pouring an adhesive between the eccentric bearing 88 and the lens frame 90 from the adjustment hole 112 and fixing the eccentric bearing 88. it can.

  As described above, in the present invention, before the guide shaft 92 is held and fixed to the lens frame 64 via the eccentric bearing 88, the eccentric shaft 88 is rotated from the adjustment hole 112 to decenter the guide shaft 92. Thus, the eccentricity adjustment of the focus lens 36 can be easily performed.

  So far, the eccentricity adjustment of the focus lens 36 has been described. However, the lens is not limited to this, and it may be applied to the eccentricity adjustment of other lenses such as a zoom lens.

  The lens device of the present invention has been described in detail above. However, the present invention is not limited to the above examples, and various improvements and modifications may be made without departing from the scope of the present invention. It is.

  DESCRIPTION OF SYMBOLS 1 ... Lens apparatus, 22 ... Mount ring, 36 ... Focus lens, 66 ... Voice coil motor (VCM), 88 ... Eccentric bearing, 90 ... Lens frame, 92 ... Guide shaft, 96 ... Collimator jig, 98 ... Bearing hole 110 ... guide shaft insertion hole, 112 ... adjustment hole

Claims (5)

A lens frame to which the lens is attached;
A guide shaft that slidably fits with the lens frame and guides the movement of the lens frame in the axial direction;
An eccentric bearing having a guide shaft insertion hole into which the tip of the guide shaft is inserted;
A holding member for holding the eccentric bearing,
The central axis of the guide shaft insertion hole is eccentric with respect to the central axis of the eccentric bearing;
A lens device. The eccentric bearing comprises a knurled portion knurled on the outer periphery;
The lens apparatus according to claim 1. The holding member includes a bearing hole into which the eccentric bearing is press-fitted,
The bearing hole is formed with a diameter that allows the eccentric bearing to rotate after press-fitting the eccentric bearing,
The lens apparatus according to claim 1, wherein: An outer peripheral member covering the holding member;
The outer peripheral member includes an adjustment hole provided at a position corresponding to the eccentric bearing when the holding member is covered;
The lens apparatus according to claim 1, wherein: The lens is a focus lens;
The lens apparatus according to claim 1, wherein:

Images