Lens device

Abstract

The invention provides a lens device capable of easily performing optical axis adjustment and enabling the whole device to be small and light. A lens device is provided with: a first lens frame (25) that holds a first lens (37) and has a first chord section (25D); a second lens frame (26) that holds the second lens (38) and has a second chord section (26D); a first adjustment mechanism (31) that performs a first adjustment of the first lens frame (25); a second adjustment mechanism (32) that performs a second adjustment of the first lens frame (25) and the second lens frame (26); the first adjustment mechanism (31) and the second adjustment mechanism are disposed closer to the image plane side than a first position where the second surface of the first lens (37) intersects the first optical axis (OA1) and closer to the objective lens side than the aperture mechanism, and the position of the aperture mechanism in the optical axis direction is fixed.

Description

Technical Field

[0001] The invention relates to a lens device. Background Art

[0002] Patent document 1 describes an optical device (lens device), which comprises: a first lens group having a negative refractive index; and a second lens group having a positive refractive index, wherein the focal length is changed by changing the air gap between the first lens group and the second lens group, and after assembling the first lens group and the second lens group, an adjustment mechanism is provided for adjusting the position of a part or all of the lens groups of the first lens group and a part of the second lens group so as to be displaced eccentrically or tilted eccentrically.

[0003] Patent document 2 describes an imaging lens (lens device) having a first lens group with positive refractive power and a second lens group with positive refractive power, wherein the first lens group includes a front group with negative refractive power and a rear group with positive refractive power, and after assembling the first lens group and the second lens group, an adjustment mechanism is provided for adjusting the position of at least one of the first lens group and the second lens group by displacing the front group eccentrically and tilting and eccentrically shifting the front group.

[0004] Patent Document 1: Japanese Patent No. 6112207

[0005] Patent Document 2: Japanese Patent Application Publication No. 2012-42663 Summary of the invention

[0006] An object of one embodiment of the technology according to the present invention is to provide a lens device that can easily adjust the optical axis and can reduce the size and weight of the entire device.

[0007] A lens device of one mode involved in the technology of the present invention comprises: a first lens frame; a second lens frame; a first adjustment mechanism; a second adjustment mechanism; and an aperture mechanism, wherein the first lens has a first surface located on the objective lens side and a second surface located on the image plane side, the first adjustment mechanism and the second adjustment mechanism are arranged closer to the image plane side than the second surface and a first position intersecting the first optical axis of the first lens and closer to the objective lens side than the aperture mechanism, and the aperture mechanism is fixed in the optical axis direction relative to the first lens group including the first lens and the second lens. The first lens frame holds the first lens and has a first chord portion. The second lens frame holds the second lens located on the image plane side of the first lens and has a second chord portion. The first adjustment mechanism performs a first adjustment of the first lens frame. The second adjustment mechanism performs a second adjustment of the first lens frame and the second lens frame. The aperture mechanism is located on the image plane side of the second lens.

[0008] Preferably, the second adjustment mechanism includes a second eccentric pin whose head is eccentric relative to the shaft, the second lens frame has an end face portion located radially outward relative to the second lens and a polygonal press-fit hole formed on the end face portion, and the shaft portion of the second eccentric pin is pressed into the press-fit hole.

[0009] Preferably, the second lens frame has a recessed portion recessed in the optical axis direction of the optical system, and the press-fit hole is connected to the recessed portion.

[0010] Preferably, in a state where the second eccentric pin is press-fitted into the press-fit hole, the shaft portion is exposed in the recessed portion when viewed in the optical axis direction.

[0011] Preferably, there is a supporting component for supporting the second lens frame, the supporting component has a limiting portion for limiting the position of the head in the direction of the optical axis, and the second adjustment mechanism performs a second adjustment by causing the shaft portion to be pressed into the press-in hole and the second eccentric pin whose position the head is limited by the limiting portion to rotate around the central axis of the head, thereby shifting the position of the shaft portion in the direction of the optical axis.

[0012] Preferably, the second lens frame has a plurality of press-in holes, and the second eccentric pins are respectively pressed into the plurality of press-in holes. The position of the shaft portion is shifted by rotating at least one of the second eccentric pins around the center axis, thereby performing a second adjustment on the inclination of the first optical axis of the first lens and the second optical axis of the second lens.

[0013] Preferably, a limiting component is provided for limiting the position of the first lens frame in the direction of the optical axis, and the first lens frame has: a positioning portion, which is arranged on the first chord portion; and four protrusions, which protrude in the direction of the optical axis and abut against the limiting component, when observed from the direction of the optical axis, the four protrusions are located at positions symmetrical with respect to a symmetry axis passing through the positioning portion and the first optical axis, and two of the four protrusions are arranged along the first chord portion.

[0014] Preferably, the second adjustment mechanisms are arranged at three locations, one of the second adjustment mechanisms is located at a position passing through the axis of symmetry, and the remaining two of the second adjustment mechanisms are located at positions symmetrical to the axis of symmetry.

[0015] Preferably, the first adjustment mechanism is disposed at two locations and is located symmetrically with respect to the symmetry axis.

[0016] Preferably, the first adjustment mechanism has a first eccentric pin whose head is eccentric relative to the shaft, the second lens frame has a fitting hole for the shaft of the first eccentric pin to be fitted, the first lens frame has a pressed portion that is pressed by the first eccentric pin, and the first adjustment mechanism performs the first adjustment by rotating the first eccentric pin fitted in the fitting hole around the center axis of the shaft, thereby pressing the pressed portion.

[0017] Preferably, the second lens frame has a plurality of fitting holes, the first lens frame has a pressed portion corresponding to the fitting holes, the first eccentric pin is respectively fitted into the plurality of fitting holes, and by rotating at least one of the first eccentric pins, the pressed portion is pressed, thereby performing a first adjustment to displace the first lens frame in a direction intersecting the optical axis.

[0018] Preferably, a part of the outer peripheral surface of the first lens frame and the second lens frame is arc-shaped, and the first chord portion and the second chord portion are surfaces intersecting the arc-shaped outer peripheral surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front side perspective view of a digital camera.

[0020] Figure 2 It is a rear perspective view of a digital camera.

[0021] Figure 3 It is a cross-sectional view of the main parts of a digital camera.

[0022] Figure 4 It is a perspective view of the first lens frame, the second lens frame, and the first adjustment mechanism.

[0023] Figure 5 This is a front view of the first lens frame.

[0024] Figure 6 This is a front view of the second lens frame.

[0025] Figure 7 It is a three-dimensional diagram of the first eccentric pin.

[0026] Figure 8 This is a front view of a state where the first lens frame and the second lens frame are integrated and the first adjustment is performed.

[0027] Fig. 9 It is an explanatory diagram showing a state before the first adjustment (A) and a state during the adjustment (B).

[0028] Fig.10 It is a perspective view of the first lens frame, the second lens frame, and the second adjustment mechanism.

[0029] Fig.11 It is a perspective view for explaining the process of press-fitting the second eccentric pin into the press-fit hole.

[0030] Fig.12 It is a cross-sectional view of the main parts in a state where the second eccentric pin is press-fitted into the press-fit hole.

[0031] Fig.13 It is a side view of a state where the first lens frame and the second lens frame are integrated and the second adjustment is performed.

[0032] Fig.14 It is along Fig.13 The main part cross-sectional view taken along the line XIV-XIV is a main part cross-sectional view showing a state before the second adjustment is performed.

[0033] Fig.15 It is a cross-sectional view of the main parts showing the state in the middle of the second adjustment.

[0034] Fig.16 This is a cross-sectional view of a main part of the lens device for explaining the arrangement of the first adjustment mechanism and the second adjustment mechanism.

[0035] Fig.17 This is a cross-sectional view of a main part of a digital camera for explaining the arrangement of a circuit board. DETAILED DESCRIPTION

[0036] like Figure 1 As shown, the digital camera 10 includes a camera body 11 and a lens device 12. In the present embodiment, the camera body 11 is in a longitudinal box shape in which the dimension in the vertical direction is larger than the dimension in the horizontal direction when viewed from the front. A lens barrel 13 is provided on the front surface of the camera body 11. A mode dial 14, a release switch 15, a power switch 16, an operating lever 17, a hot shoe 18, etc. are provided on one side of the camera body 11. An external flash device, etc. is detachably mounted on the hot shoe 18. Furthermore, since a synchronization contact (not shown) is provided on the hot shoe 18, the mounted flash device can emit light in conjunction with the shutter release.

[0037] The camera body 11 has an imaging element 20 built in (refer to Figure 3 The imaging element 20 is, for example, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, a CCD (Charge Coupled Device) image sensor, or an organic thin film imaging element.

[0038] like Figure 2 As shown, a display 19 is provided on the back side of the camera body 11 .

[0039] The display 19 is an LCD (Liquid Crystal Display) or an OELD (Organic Electroluminescent Display). The display 19 is used for live view display, photographic image display, setting menu display, etc. In the live view display, the photographic image of the subject represented by the image data acquired by the imaging element 20 is displayed in real time on the display 19. The display 19 is rotatably mounted on the camera body 11 with the hinge 11A as the center.

[0040] like Figure 3 As shown, the lens device 12 is located inside the lens barrel 13 and forms an image of the subject light on the imaging element 20. The lens device 12 includes the first to fourth lens groups 21 to 24, the first to fifth lens frames 25 to 29, and the first adjustment mechanism 31 (see FIG. Figure 4 )、The second adjustment mechanism 32 (reference Fig.10 ), aperture mechanism 33, support member 34 and limiting member 35. In each embodiment described below, the first to fourth lens groups 21 to 24 may also be lens groups composed of a plurality of lenses. The imaging element 20 is held by a bracket 39 and fixed to the image plane side of the lens device 12.

[0041] The first to fourth lens groups 21 to 24 constitute an imaging lens 36. In addition, the structure of the imaging lens 36 is not limited to this, and a structure including lens groups other than the first to fourth lens groups 21 to 24 may be used. The first lens group 21 includes a first lens 37 and a second lens 38. In addition, as the structure of the first lens group 21, any structure including the first lens 37 and the second lens 38 may be used. For example, a structure in which other lenses are arranged between the first lens 37 and the second lens 38 may be used.

[0042] The first lens frame 25 holds the first lens 37. The second lens frame 26 holds the second lens 38. The third to fifth lens frames 27 to 29 hold the second to fourth lens groups 22 to 24, respectively. The first lens 37 is located on the most objective lens side of the imaging lens 36.

[0043] like Figure 4 As shown, the first lens frame 25 has protrusions 25A to 25C protruding radially outward. The protrusion 25A has a positioning portion 41. The protrusions 25B and 25C have pressed portions 42A and 42B, respectively. The positioning portion 41 is a groove that fits with the positioning pin 62 described later. The pressed portions 42A and 42B are fitting holes that fit with the first eccentric pin 61 described later.

[0044] The pressed portions 42A and 42B are located relative to the symmetric axis SA1 (reference Figure 5The symmetric axis SA1 is a first optical axis OA1 (reference Figure 4 ) of the symmetry axis. Hereinafter, the case of being orthogonal includes the case of being substantially orthogonal to each other, and when being coaxial, includes the case of being substantially coaxial. In addition, the Z1 direction is a direction parallel to the first optical axis OA1 of the first lens 37, the X1 direction is a direction parallel to the symmetry axis SA1 and orthogonal to the Z1 direction, and the Y1 direction is a direction orthogonal to the Z1 direction and the X1 direction.

[0045] like Figure 5 As shown, the first lens frame 25 has a first chord portion 25D. The above-mentioned positioning portion 41 is arranged on the first chord portion 25D. Therefore, the first chord portion 25D is arranged to intersect with the symmetry axis SA1. A part of the outer peripheral surface of the first lens frame 25 is arc-shaped, and the first chord portion 25D is a surface intersecting with the arc-shaped outer peripheral surface 25E. Specifically, it is arranged that the outer peripheral surface 25E of the protrusions 25B and 25C intersects with the first chord portion 25D of the protrusion 25A. In addition, the intersection in the first lens frame 25 means that the first chord portion 25D and the outer peripheral surface 25E can actually intersect, but as in the present embodiment, the surface formed by extending the outer peripheral surface 25E (indicated by two dotted lines) and the surface formed by extending the first chord portion 25D (indicated by two dotted lines) can also intersect. In the present embodiment, the second lens 38 is located on the image plane side of the first lens 37 (reference Figure 3 ).

[0046] Furthermore, the first lens frame 25 has four protrusions 43 protruding in the Z1 direction. The protrusions 43 abut against the limiting member 35. When viewed from the Z1 direction, the four protrusions 43 are located at positions line-symmetrical with respect to the symmetry axis SA1, and two of the four protrusions 43 are arranged along the first chord portion 25D.

[0047] like Figure 6 As shown, the second lens frame 26 has end face portions 26A to 26C, a second chord portion 26D and an outer peripheral surface 26E in terms of the outer shape. In addition, the outer peripheral surface 26E is a part of the outer peripheral surface of the second lens frame 26 and is formed in an arc shape. The end face portions 26A to 26C also include the end of the outer shape of the second lens frame 26 and the portion near it. In the present embodiment, the end face portions 26A to 26C are located radially outward of the second lens 38 and radially inward of the outer peripheral surface 26E.

[0048] The second lens frame 26 has a plurality of press-in holes. In the present embodiment, the second lens frame 26 has three press-in holes 45A to 45C. Specifically, the press-in holes 45A to 45C are respectively arranged on the end surface portions 26A to 26C. The press-in holes 45A to 45C are through holes having a polygonal cross-sectional shape, into which the second eccentric pin 81 described later is pressed. In the present embodiment, the press-in holes 45A to 45C are formed into a hexagonal cross-sectional shape (refer to Fig.11 ).

[0049] The second chord portion 26D is a surface intersecting the outer peripheral surface 26E. In addition, as in the present embodiment, the intersection in the second lens frame 26 may be that the second chord portion 26D and the outer peripheral surface 26E actually intersect, but it may also be that a surface formed by extending the outer peripheral surface 26E and a surface formed by extending the second chord portion 26D intersect.

[0050] The second lens frame 26 has recesses 46A to 46C, a positioning hole 47, rotation guides 48A, 48B, and fitting holes 49A, 49B on the radially inner side than the outer peripheral surface 26E. The recesses 46A to 46C are respectively arranged at positions corresponding to the surface 26F on the objective lens side and the end surface portions 26A to 26C of the second lens frame 26, and are recessed in the Z2 direction. In addition, the Z2 direction is a direction parallel to the second optical axis OA2 of the second lens 38, the X2 direction is a direction parallel to the symmetry axis SA2 described later and orthogonal to the Z2 direction, and the Y2 direction is a direction orthogonal to the Z2 direction and the X2 direction. In addition, it is not limited to this, and the recesses 46A to 46C can also be arranged on the surface on the image plane side of the second lens frame 26. The press-in holes 45A to 45C are connected to the recesses 46A to 46C. Specifically, the press-fit holes 45A to 45C penetrate from the end surface portions 26A to 26C to the recessed portions 46A to 46C.

[0051] The press-in holes 45B and 45C are located at positions symmetrical to each other with respect to the symmetry axis SA2, and the press-in hole 45A is located at a position passing through the symmetry axis SA2. The symmetry axis SA2 is the second optical axis OA2 passing through the positioning hole 47 and the second lens 38 (refer to Figure 4 )'s axis of symmetry.

[0052] In the fitting holes 49A and 49B, the shaft portion 61A of the first eccentric pin 61 is rotatably fitted, respectively. The fitting holes 49A and 49B are located at positions that are line-symmetrical with respect to the axis of symmetry SA2. The rotation guide portions 48A and 48B are circular hole portions formed coaxially with the fitting holes 49A and 49B, and are formed corresponding to the flange portion 61C of the first eccentric pin 61. The rotation guide portions 48A and 48B guide the rotation of the first eccentric pin 61 fitted with the fitting holes 49A and 49B. In addition, as the fitting holes 49A and 49B, similar to the press-in holes 45A to 45C, they can be through holes with a polygonal cross-sectional shape. As a result, the first eccentric pin 61 can be easily pressed in, and the process can be performed again.

[0053] The aperture mechanism 33 is located on the image plane side of the second lens 38 (refer to Figure 3 ). The aperture mechanism 33 is fixed in position in the Z1 direction and the Z2 direction relative to the first lens group including the first lens 37 and the second lens 38. In the present embodiment, the aperture mechanism 33 is fixed to the support member 34. In the present embodiment, the aperture mechanism 33 is fixed with an aperture opening 33A. In addition, it is not limited to this, and the aperture opening may be variable by moving the aperture plate or the like.

[0054] The first adjustment mechanism 31 includes a first eccentric pin 61 and a positioning pin 62. The positioning pin 62 is engaged with the positioning hole 47 of the second lens frame 26 and fixed to the second lens frame 26. The positioning pin 62 fixed to the second lens frame 26 protrudes on the objective lens side and the image plane side of the second lens frame 26 ( Fig.14 and Fig.15 status shown).

[0055] like Figure 7 As shown, the first eccentric pin 61 includes a shaft portion 61A, a head portion 61B, and a flange portion 61C. The outer diameter of the head portion 61B is larger than that of the shaft portion 61A, and the outer diameter of the flange portion 61C is larger than that of the head portion 61B. The first eccentric pin 61 is arranged between the shaft portion 61A and the head portion 61B with the flange portion 61C interposed therebetween, and the shaft portion 61A, the head portion 61B, and the flange portion 61C are integrally provided.

[0056] The outer diameter of the head portion 61B is formed to correspond to the radial width of the pressed portions 42A and 42B of the first lens frame 25. The head portion 61B is provided with an insertion groove 61D for inserting a jig. The operator can insert the jig into the insertion groove 61D to rotate the first eccentric pin 61.

[0057] The head 61B of the first eccentric pin 61 is eccentric with respect to the shaft 61A. Therefore, when the first eccentric pin 61 rotates around the shaft 61A, the head 61B changes position with respect to the shaft 61A. In addition, the flange 61C is not eccentric with respect to the shaft 61A, but is coaxially located with the shaft 61A.

[0058] like Figure 4 and Figure 8 As shown, in the first adjustment based on the first adjustment mechanism 31, first, the positioning portion 41 of the first lens frame 25 is engaged with the positioning pin 62 fixed to the positioning hole 47 of the second lens frame 26, the shaft portion 61A of the first eccentric pin 61 is engaged with the engagement holes 49A, 49B of the second lens frame 26, and the head portion 61B of the first eccentric pin 61 is engaged with the pressed portions 42A, 42B of the first lens frame 25. Thus, the position of the second chord portion 26D of the second lens frame 26 can be aligned with the position of the first chord portion 25D of the first lens frame 25. Furthermore, the position of the positioning portion 41 can be aligned with the position of the positioning hole 47. As described above, the first adjustment is performed in a state where the first lens frame 25 and the second lens frame 26 are integrated.

[0059] As described above, the pressed parts 42A and 42B are located at positions symmetrical to the axis of symmetry SA1, and the head 61B of the first eccentric pin 61 constituting the first adjustment mechanism 31 is engaged with the pressed parts 42A and 42B. That is, the first adjustment mechanism 31 is arranged at two locations at positions symmetrical to the axis of symmetry SA1.

[0060] like Fig. 9 As shown in (A), in the first adjustment mechanism 31, the head 61B of the first eccentric pin 61 is exposed through the pressed portions 42A and 42B of the first lens frame 25. As a result, the first eccentric pin 61 engaged with the engagement holes 49A and 49B of the second lens frame 26 can be rotated around the central axis of the shaft portion 61A. Fig. 9 As shown in (B), for at least one of the first eccentric pins 61, when rotating around the central axis of the shaft portion 61A, the pressed portions 42A and 42B are pressed. By pressing the pressed portions 42A and 42B, the first lens frame 25 can be moved (displaced) in the X1 direction and the Y1 direction relative to the second lens frame 26. That is, the first optical axis OA1 of the first lens 37 can be moved in a consistent position relative to the second optical axis OA2 of the second lens 38. As described above, the first adjustment of the first lens frame 25 relative to the second lens frame 26 can be performed.

[0061] like Fig.10 As shown, the support component 34 includes a first support component 65 and a second support component 66. The first support component 65 and the second support component 66 are fastened by screwing together a plurality of screw components 67. In addition, the present invention is not limited thereto, and the support component 34 may be formed of one component. The first support component 65 supports the second lens frame 26. As a method of supporting the second lens frame 26 relative to the first support component 65, any method that can support the second lens frame 26, such as screwing, fixing based on interlocking, fixing by gluing with an adhesive, etc., may be used.

[0062] The first support member 65 has contact portions 68A to 68C and a positioning groove 69. The contact portions 68A to 68C are provided at positions contacting the end surface portions 26A to 26C of the second lens frame 26, respectively. The contact portions 68A to 68C have restriction portions 71A to 71C, respectively. The restriction portions 71A to 71C are through holes into which the second eccentric pin 81 described later is fitted.

[0063] like Fig.10 As shown, the second adjustment mechanism 32 includes a plurality of second eccentric pins 81. In the present embodiment, the second adjustment mechanism 32 includes three second eccentric pins 81 corresponding to the press-in holes 45A to 45C. As described above, the press-in holes 45B and 45C are located at positions that are line symmetrical with respect to the symmetry axis SA2, and the press-in hole 45A is located at a position that passes through the symmetry axis SA2. That is, the second adjustment mechanism 32 is arranged at three locations, one of the second adjustment mechanisms 32 is located at a position that passes through the symmetry axis SA2, and the remaining two of the second adjustment mechanisms 32 are located at positions that are line symmetrical with respect to the symmetry axis SA2.

[0064] like Fig.11 As shown, the second eccentric pin 81 has a shaft portion 81A and a head portion 81B. The outer diameter of the head portion 81B is larger than the outer diameter of the shaft portion 81A. The second eccentric pin 81 is integrally provided with the shaft portion 81A and the head portion 81B. The shaft portion 81A of the second eccentric pin 81 is pressed into the plurality of press-in holes 45A to 45C, respectively. The outer diameter of the shaft portion 81A only needs to be able to be pressed into the press-in holes 45A to 45C, for example, as long as the outer diameter is smaller than the circumscribed circle and larger than the inscribed circle of the press-in holes 45A to 45C. An insertion groove 81C for inserting a clamp is provided in the head portion 81B. The operator can insert the clamp into the insertion groove 81C and rotate the second eccentric pin 81.

[0065] The head 81B of the second eccentric pin 81 is eccentric with respect to the shaft 81A, similarly to the first eccentric pin 61. Therefore, when the second eccentric pin 81 rotates about the shaft 81A, the position of the head 81B changes with respect to the shaft 81A.

[0066] like Fig.12 As shown, when the second eccentric pin 81 is pressed into the press-in hole 45A, the shaft portion 81A is exposed in the recess 46A when viewed in the Z2 direction. In addition, even when the second eccentric pin 81 is pressed into the press-in holes 45B and 45C, the shaft portion 81A is exposed in the recesses 46B and 46C when viewed in the Z2 direction. Thus, the second eccentric pin 81 can be pressed by inserting a jig 82 or the like into the recesses 46A to 46C. Fig.12 In order to avoid complication, the first lens frame 25, the second supporting member 66, etc. are omitted.

[0067] like Fig.10 and Fig.13 As shown, in the second adjustment based on the second adjustment mechanism 32, first, the state in which the first lens frame 25 and the second lens frame 26 are combined (the state in which the first lens frame 25 and the second lens frame 26 are integrated in the above-mentioned first adjustment) is set so that the contact portions 68A to 68C contact the end surface portions 26A to 26C, and the front end portion of the positioning pin 62 is aligned with the position of the positioning groove 69. Thus, the position of the first chord portion 25D of the first lens frame 25 and the position of the second chord portion 26D of the second lens frame 26 can be aligned with the position of the positioning groove 69.

[0068] like Fig.11 As shown, the shaft portion 81A of the second eccentric pin 81 constituting the second adjustment mechanism 32 is pressed into the press-fit hole 45B, and the head portion 81B of the second eccentric pin 81 is fitted into the restriction portion 71B of the first support member 65. Fig.11 , only the state where the shaft portion 81A is pressed into the press-in hole 45B and the head portion 81B is fitted into the restricting portion 71B is shown, but the shaft portion 81A is pressed into the press-in holes 45A and 45C in the same manner, and the head portion 81B is fitted into the restricting portions 71A and 71C in the same manner. Thus, the restricting portions 71A to 71C restrict the position of the head portion 81B in the Z2 direction.

[0069] like Fig.13 As shown, the second adjustment mechanism 32 can perform the second adjustment of the first lens frame 25 and the second lens frame 26 by rotating the second eccentric pin 81 pressed into the press-in hole 45A to 45C of the second lens frame 26 around the central axis of the head 81B. That is, in the case of rotating around the central axis of the head 81B, the head 81B does not move because the position of the head 81B in the Z2 direction is limited by the limiting parts 71A to 71C, but as described above, the head 81B is eccentric relative to the shaft 81A, so the shaft 81A can displace the position of the head 81B in the Z2 direction. And, in this case, the limiting part 35 is not fixed to the second lens frame 26, and the tightening by the screw part 83 described later is loosened.

[0070] like Fig.14 As shown in FIG. 1 , when one of the second eccentric pins 81 is rotated about the central axis of the head 81B, the position of the shaft 81A relative to the head 81B in the Z2 direction changes. As a result, the press-fit hole 45A into which the shaft 81A is pressed also moves in the Z2 direction. Fig.14 and Fig.15 , the second eccentric pin 81 in which the shaft portion 81A is press-fitted into the press-fit hole 45A is shown; however, the second eccentric pin 81 press-fitted into the press-fit holes 45B and 45C also operates in the same manner.

[0071] When only one of the second eccentric pins 81 is rotated and the remaining two second eccentric pins 81 are not rotated, the press-in hole 45A into which the rotating second eccentric pin 81 is pressed moves only in the Z2 direction, and therefore the press-in holes 45B and 45C into which the remaining two second eccentric pins 81 are pressed do not move. That is, only one press-in hole 45A moves in the Z2 direction, and therefore the first lens frame 25 and the second lens frame 26 rotate ( Fig.15 That is, the inclination of the first optical axis OA1 of the first lens 37 and the second optical axis OA2 of the second lens 38 can be second adjusted.

[0072] As described above, after the operator performs the first adjustment and the second adjustment, he / she checks the imaging performance of the imaging lens 36 and checks whether the optical axis eccentricity is properly corrected. The method for checking the imaging performance of the imaging lens 36 is the same as the conventional method, for example, by visually checking the image of the test chart taken by the imaging lens 36. After the confirmation, the first lens frame 25 and the second lens frame 26 are fixed to the support member 33 by screw fixing or the like.

[0073] like Fig.16 As shown, the first adjustment mechanism 31 and the second adjustment mechanism 32 are arranged in a range A which is closer to the image plane side than a first position P1 where the second surface 37B of the first lens 37 and the first optical axis OA1 of the first lens 37 intersect and which is closer to the objective lens side than the aperture mechanism 33. In addition, the first surface 37A of the first lens 37 is a surface on the objective lens side, and the second surface 37B is a surface on the image plane side.

[0074] Furthermore, the limiting member 35 is an annular member that limits the position of the first lens frame 25 in the Z1 direction. Specifically, the limiting member 35 is screwed to the second lens frame 26 by a plurality of screw members 83 to be fastened (see FIG. 1 ). Fig.13 ). The restriction member 35 is fastened to the second lens frame 26 so as to come into contact with the convex portion 43 of the first lens frame 25. The first lens frame 25 is pressed by the restriction member 35 coming into contact with the convex portion 43, and its position in the Z1 direction is restricted.

[0075] like Fig.17 As shown, a circuit board 84 is provided inside the camera body 11. A control unit for controlling each unit of the digital camera 10 is provided on the circuit board 84. The circuit board 84 is connected to the hot shoe 18. It is known that the hot shoe 18 is provided as close to the lens device 12 as possible in view of the installation of a flash device, etc. That is, it is required to reduce the interval D1 between the lens optical axis of the lens device 12 and the hot shoe 18. As described above, in this embodiment, the camera body 11 is in a vertically long box shape, and in order to make the hot shoe 18 close to the lens device 12, the hot shoe 18 is provided on one side of the camera body 11.

[0076] However, in the conventional lens device, the outer shape is cylindrical, and if the lens optical axis is too close to the hot shoe, it is impossible to ensure the space for connecting the circuit substrate on the hot shoe. In contrast, in the lens device 12 of the present invention, the first chord portion 25D is provided in the first lens frame 25, and the second chord portion 26D is provided in the second lens frame 26. Therefore, by arranging these first chord portion 25D and second chord portion 26D at a position opposite to the hot shoe 18, it is possible to expand the space between the hot shoe 18 and the lens device 12. A portion 84A of the circuit substrate 84 can be arranged in the space between the hot shoe 18 and the lens device 12. In this way, the interval D1 between the lens optical axis of the lens device 12 and the hot shoe 18 can be narrowed, and the space for connecting the circuit substrate 84 on the hot shoe 18 can also be ensured. That is, the lens device 12 and the camera device including the lens device 12 can be made smaller and lighter.

[0077] As described above, in the lens device 12 of the present invention, the optical axis adjustment of the first lens 37 and the second lens 38 can be easily performed through the first adjustment mechanism 31 and the second adjustment mechanism 32, that is, the position and inclination of the first optical axis OA1 of the first lens 37 and the second optical axis OA2 of the second lens 38 can be easily adjusted, and the overall device can be made compact and lightweight.

[0078] Furthermore, since the positions of the four protrusions 43 of the first lens frame 25 are restricted by the restricting member 35, the positions and inclinations of the first optical axis OA1 of the first lens 37 and the second optical axis OA2 of the second lens 38 can be maintained with high precision after the first and second adjustments.

[0079] Furthermore, since the cross-sectional shape of the press-fit holes 45A to 45C into which the second eccentric pin 81 is press-fitted is polygonal, the area where the shaft portion 81A of the second eccentric pin 81 contacts the press-fit holes 45A to 45C is small, and the press-fitting process can be easily performed.

[0080] Furthermore, since recesses 46A to 46C connected to the press-fit holes 45A to 45C are provided, when a second adjustment is desired, a jig or the like can be inserted into the recesses 46A to 46C to easily squeeze out the second eccentric pin 81, and the press-fitting process can be performed again.

[0081] In addition, the hardware structure of the processing unit that executes various processes, such as the control unit provided on the circuit board 84, is various processors as shown below. Among the various processors, there are general-purpose processors that execute software (programs) and function as various processing units, namely CPU (Central Processing Unit), GPU (Graphical Processing Unit), FPGA (Field Programmable Gate Array), etc., processors whose circuit structure can be changed after manufacturing, namely PLD (Programmable Logic Device), processors with circuit structures specially designed for executing various processes, namely dedicated circuits, etc.

[0082] One processing unit may be composed of one of these various processors, or may be composed of a combination of two or more processors of the same type or different types (for example, a combination of multiple FPGAs or a CPU and an FPGA, or a combination of a CPU and a GPU, etc.). Furthermore, multiple processing units may be composed of one processor. As an example of multiple processing units composed of one processor, first, there is the following method: as represented by a computer such as a client or a server, one processor is composed of a combination of one or more CPUs and software, and the processor functions as multiple processing units. Second, there is the following method: as represented by SoC (System On Chip: System on Chip), a processor that uses one IC (Integrated Circuit: Integrated Circuit) chip to implement the functions of the entire system including multiple processing units. In this way, various processing units are constructed as a hardware structure using one or more of the above-mentioned various processors.

[0083] Furthermore, more specifically, the hardware structure of these various processors is a circuit in the form of a combination of circuit elements such as semiconductor elements.

[0084] In addition, in each of the above-mentioned embodiments, a lens device 12 without a zoom lens is exemplified, but the present invention is not limited to this, and a zoom lens may be included in the imaging lens 36. In addition, in addition to digital cameras, the present invention can also be applied to camera devices such as smartphones and video cameras. In addition, in the above-mentioned embodiments, an aperture mechanism with a fixed aperture opening or a mechanically variable aperture opening is exemplified, but the aperture mechanism provided by the lens device of the present invention is not limited to this, and may also be a structure with the following aperture mechanism: an ND (Neutral Density: neutral density) filter is set and the aperture opening is made variable by changing the concentration of the ND filter.

[0085] Explanation of symbols

[0086] 10-digital camera, 11-camera body, 11A-hinge, 12-lens device, 13-lens barrel, 14-mode dial, 15-release switch, 16-power switch, 17-operating lever, 18-hot shoe, 19-display, 20-imaging element, 21-24-1st to 4th lens groups, 25-29-1st to 5th lens frames, 25A-25C-protrusions, 25D-1st chord, 25E - peripheral surface, 26A-26C-end surface, 26D-second chord portion, 26E-peripheral surface, 26F-objective lens side surface, 31-first adjustment mechanism, 32-second adjustment mechanism, 33-aperture mechanism, 33A-aperture opening, 34-support component, 35-limiting component, 36-imaging lens, 37-first lens, 37A-first surface, 37B-second surface, 38-second lens, 39-bracket, 41 - positioning portion, 42A, 42B - pressed portion, 43 - convex portion, 45A to 45C - press-in holes, 46A to 46C - recessed portions, 47 - positioning hole, 48A, 48B - rotation guide portions, 49A, 49B - fitting holes, 61 - first eccentric pin, 61A - shaft portion, 61B - head portion, 61C - flange portion, 61D - insertion groove, 62 - positioning pin, 65 - first supporting member, 66 - second supporting member , 67-threaded component, 68A~68C-abutment portion, 69-positioning groove, 71A~71C-limiting portion, 81-second eccentric pin, 81A-shaft portion, 81B-head portion, 81C-insertion groove, 82-clamp, 83-threaded component, 84-circuit substrate, A-range, D1-interval, OA1-first optical axis, OA2-second optical axis, P1-first position, SA1-symmetry axis, SA2-symmetry axis.

Claims

1. A lens device comprising: a first lens frame holding the first lens and having a first chord portion; a second lens frame holding a second lens located on the image plane side of the first lens and having a second chord portion; A first adjustment mechanism for performing a first adjustment of the first lens frame; a second adjustment mechanism for performing a second adjustment of the first lens frame and the second lens frame; and The aperture mechanism is located on the image side of the second lens. The first lens has a first surface located on the objective lens side and a second surface located on the image plane side. The first adjustment mechanism and the second adjustment mechanism are arranged on the image plane side relative to a first position where the second surface intersects the first optical axis of the first lens and on the objective lens side relative to the aperture mechanism. The position of the aperture mechanism in the optical axis direction is fixed relative to the first lens group including the first lens and the second lens.

2. The lens device according to claim 1, wherein: The second adjustment mechanism includes a second eccentric pin whose head is eccentric with respect to the shaft. The second lens frame includes: an end surface portion located radially outwardly of the second lens; and a polygonal press-fit hole formed in the end surface portion. The shaft portion of the second eccentric pin is press-fitted into the press-fit hole.

3. The lens device according to claim 2, wherein: The second lens frame has a recessed portion recessed in the optical axis direction. The press-in hole is connected to the recess.

4. The lens device according to claim 3, wherein: In a state where the second eccentric pin is press-fitted into the press-fit hole, the shaft portion is exposed in the recessed portion when viewed in the optical axis direction.

5. The lens device according to claim 4, comprising: a supporting member, supporting the second lens frame, The support member has a restriction portion that restricts the position of the head in the direction of the optical axis. The second adjustment mechanism performs the second adjustment by rotating the second eccentric pin, whose shaft portion is press-fitted into the press-fit hole and whose head portion is positionally restricted by the restriction portion, about the central axis of the head portion, thereby displacing the position of the shaft portion in the optical axis direction.

6. The lens device according to claim 5, wherein: The second lens frame has a plurality of the press-in holes. The second eccentric pins are pressed into the plurality of press-in holes respectively. The second adjustment is performed on the inclinations of the first optical axis of the first lens and the second optical axis of the second lens by rotating at least one of the second eccentric pins around the central axis to displace the position of the shaft portion.

7. The lens device according to claim 6, comprising: a limiting member for limiting the position of the first lens frame in the direction of the optical axis, The first lens frame has: a positioning portion, disposed on the first chord portion; and four convex parts protruding in the direction of the optical axis and abutting against the limiting component, When viewed from the optical axis direction, the four protrusions are located symmetrically with respect to a symmetry axis passing through the positioning portion and the first optical axis. Two of the four protrusions are arranged along the first chord portion.

8. The lens device according to claim 7, wherein: The second adjustment mechanism is arranged at three locations. One of the second adjustment mechanisms is located at a position passing through the symmetry axis, The remaining two of the second adjustment mechanisms are located symmetrically with respect to the symmetry axis.

9. The lens device according to claim 8, wherein: The first adjustment mechanism is disposed at two locations and is located symmetrically with respect to the symmetry axis.

10. The lens device according to claim 9, wherein: The first adjustment mechanism comprises a first eccentric pin whose head is eccentric with respect to the shaft. The second lens frame has a fitting hole into which the shaft portion of the first eccentric pin is fitted. The first lens frame has a pressed portion pressed by the first eccentric pin. The first adjustment mechanism performs the first adjustment by rotating the first eccentric pin fitted in the fitting hole about the central axis of the shaft portion so that the pressed portion is pressed.

11. The lens device according to claim 10, wherein: The second lens frame has a plurality of the fitting holes. The first lens frame has the pressed portion corresponding to the fitting hole. The first eccentric pin is respectively engaged in the plurality of engagement holes. The pressed portion is pressed by rotating at least one of the first eccentric pins, thereby performing the first adjustment of displacing the first lens frame in a direction intersecting the optical axis.

12. The lens device according to claim 11, wherein: Parts of the outer peripheral surfaces of the first lens frame and the second lens frame are arc-shaped, and the first chord portion and the second chord portion are surfaces intersecting the arc-shaped outer peripheral surfaces.

Images