Lens device and imaging device

Abstract

The present invention provides a lens device and an imaging device that facilitate lens adjustment. [Solution] The lens device 100 includes lens frames 111, 112 for holding the first lens, a holding frame 120 for holding the lens frames 111, 112 and having a first elongated hole 121 and a second elongated hole 122, and an eccentric roller 130 positioned in the first elongated hole 121 and the second elongated hole 122 and fixed to the lens frames 111, 112. In a view of the rotation axis 131 of the eccentric roller 130, the outer circumference of the eccentric roller 130 is divided into four regions by a first axis 11 and a second axis 12 intersecting the rotation axis 131, with one tangent line 31 along the first axis 11 in the first region 21, one tangent line 32 along the second axis 12 in the second region 22, one tangent line 33 along the second axis 12 in the third region 23, and one tangent line 34 along the first axis 11 in the fourth region 24.

Description

[Technical Field]

[0001] The present invention relates to a lens device and an imaging apparatus. [Background Art]

[0002] Patent Document 1 discloses a lens barrel configured by: a lens holding frame that holds an optical member; a fixed member; a first adjustment member that supports the lens holding frame so as to enable position adjustment; and a second adjustment member that supports the lens holding frame so as to enable position adjustment, wherein the first adjustment member has a spherical surface portion, by rotating the first adjustment member around an adjustment axis that passes through a center point of the spherical surface portion and is orthogonal to an optical axis, the lens holding frame can be moved in a direction linearly moving along the adjustment axis, and the second adjustment member enables the lens holding frame to rotate around a lens barrel rotation axis that passes through the center point of the spherical surface portion and is parallel to the optical axis; the lens barrel further comprises a third adjustment member that supports the lens holding frame so as to enable position adjustment, and a fourth adjustment member that supports the lens holding frame so as to enable position adjustment, the third adjustment member can rotationally move the lens holding frame around an axis passing through the center point of the spherical surface portion and the fourth adjustment member, and the fourth adjustment member can rotationally move the lens holding frame around an axis passing through the center point of the spherical surface portion and the third adjustment member.

[0003] Patent Document 2 discloses a lens position adjustment structure comprising: a lens holding frame that holds a lens; an outer frame having an optical axis direction position regulating surface that determines the position of the lens holding frame in the optical axis direction, and supporting the lens holding frame movably in a plane orthogonal to the optical axis; an elastic holding member that is engaged with the outer frame, and elastically presses the lens holding frame in a direction approaching the optical axis direction position regulating surface to hold the lens holding frame at a fixed position relative to the outer frame; and two elongated holes formed in the lens holding frame, the two elongated holes being located within the same optical axis orthogonal plane, and having longitudinal directions substantially orthogonal to each other in the optical axis orthogonal plane, wherein a position adjusting means inserted into the two elongated holes applies a moving force in a direction orthogonal to the longitudinal direction of each elongated hole, thereby adjusting the position of the lens holding frame held by the elastic holding member within the optical axis orthogonal plane.

[0004] Patent Document 3 describes an eccentric roller having a through hole, wherein there are multiple usable and non-usable areas on the outer circumference, the distance from the center of the through hole is always constant within the usable area, and the distance from the center of the through hole in each of the usable areas is different from that of the stepped eccentric roller. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2016-029418 [Patent Document 2] Japanese Patent Publication No. 2010-008920 [Patent Document 3] Japanese Patent Publication No. 2020-140086 [Overview of the Initiative]

[0006] One embodiment of the technology of this disclosure provides a lens device and an imaging device that can facilitate lens adjustment. [Means for solving the problem]

[0007] (1) A lens frame that holds the first lens, A retaining frame that holds the above lens frame and has an elongated hole, It comprises an eccentric roller positioned in the elongated hole and fixed to the lens frame, In a view of the rotation axis of the eccentric roller described above, the outer circumference of the eccentric roller is divided into four regions by the first axis and the second axis intersecting the rotation axis, The first region has one tangent line along the first axis, The second region has one tangent line along the second axis, The third region has one tangent line along the second axis, The fourth region has one tangent line along the first axis. Lens device.

[0008] (2) (1) The lens device described above, The relative positional relationship between the lens frame and the retaining frame can be changed by rotating the eccentric roller. Lens device.

[0009] (3) (2) The lens device described above, The relative positional relationship between the lens frame and the retaining frame changes linearly with respect to the amount of rotation of the eccentric roller. Lens device.

[0010] (4) (2) The lens device described above, The amount of movement of the lens frame relative to the retaining frame is constant with respect to the amount of rotation of the eccentric roller. Lens device.

[0011] (5) A lens device described in any one of (1) to (4), The lens frame is provided with respect to the retaining frame in a direction different from the extending direction of the elongated hole, Lens device.

[0012] (6) A lens device described in any one of (1) to (5), The above-mentioned elongated hole has a first elongated hole extending in a first direction and a second elongated hole extending in a second direction different from the first direction. The above-mentioned eccentric roller is positioned in the first elongated hole and the second elongated hole, Lens device.

[0013] (7) (6) Lens device as described above, The second direction described above is a direction perpendicular to the first direction described above. Lens device.

[0014] (8) (6) Lens device as described above, The first direction is a direction along the optical axis of the first lens, A lens device.

[0015] (9) The lens device according to (6), wherein comprising a biasing member that biases the lens frame relative to the holding frame in a direction different from an extending direction of the elongated hole, the biasing member is a first biasing member that biases the lens frame relative to the holding frame along a third direction different from the first direction and the second direction, A lens device.

[0016] (10) The lens device according to (9), wherein the biasing member further comprises a second biasing member that biases the lens frame relative to the holding frame along the first direction, A lens device.

[0017] (11) The lens device according to any one of (6) to (10), wherein the first elongated hole and the second elongated hole are arranged along a circumference around the optical axis of the first lens, A lens device.

[0018] (12) The lens device according to any one of (1) to (11), wherein the eccentric roller has a plurality of abutting portions that abut against a plurality of jigs for rotating the eccentric roller, A lens device.

[0019] (13) The lens device according to (12), wherein the plurality of jigs have different tip shapes, A lens device.

[0020] (14) The lens device according to (12), wherein the plurality of jigs include a first jig and a second jig, The above contact portion is, In the direction along the rotation axis, a first contact surface is formed that can only contact the first jig among the first and second jigs, In the direction along the rotation axis, it has a second contact surface that can be contacted only by the second jig among the first and second jigs, Lens device.

[0021] (15) (14) Lens device as described above, The second contact surface is the upper surface of the wall portion extending from the first contact surface. The side surface of the wall portion described above is such that the first jig and the second jig can contact each other in the rotational direction. Lens device.

[0022] (16) (15) Lens device as described above, The above wall portion is arranged in multiple locations along the rotation axis. Lens device.

[0023] (17) A lens device described in any one of (14) to (16), The above-mentioned multiple jigs include a third jig having two tip portions, The above-mentioned contact portion has one or more pairs of holes into which the two tip portions can be inserted, positioned symmetrically with respect to the rotation axis. Lens device.

[0024] (18) An imaging device comprising a lens device as described in any one of (1) to (17). [Effects of the Invention]

[0025] According to the present invention, it is possible to provide a lens device and an imaging device that can facilitate lens adjustment. [Brief explanation of the drawing]

[0026] [Figure 1]Figure 1 is a perspective view showing an example of the lens device 100 of this embodiment. [Figure 2] Figure 2 is a perspective view showing an example of a lens frame 111, 112, retaining frame 120, and eccentric roller 130 that hold the lens 101. [Figure 3] Figure 3 is a front view of the lens frames 111, 112, the retaining frame 120, and the eccentric roller 130 shown in Figure 2. [Figure 4] Figure 4 is a perspective view of the lens frames 111 and 112 shown in Figure 2. [Figure 5] Figure 5 is a perspective view of the retaining frame 120 shown in Figure 2. [Figure 6] Figure 6 shows an example of the shape of the first elongated hole 121. [Figure 7] Figure 7 shows an example of the shape of the second elongated hole 122. [Figure 8] Figure 8 is a perspective view showing the eccentric roller 130 and the screw 140. [Figure 9] Figure 9 is a top view showing the shape of the outer circumference of the eccentric roller 130. [Figure 10] Figure 10 shows an example of the relationship between the rotation angle of the eccentric roller 130 and the offset amount of the lens frame 112 relative to the retaining frame 120. [Figure 11] Figure 11 is a cross-sectional view showing an example of a first biasing member that biases the lens frame 112 relative to the retaining frame 120. [Figure 12] Figure 12 is a cross-sectional view showing an example of a second biasing member that biases the lens frame 112 relative to the retaining frame 120. [Figure 13] Figure 13 is a perspective view of the eccentric roller 130 to illustrate an example of the contact portion of the eccentric roller 130. [Figure 14] Figure 14 is a top view of the eccentric roller 130 shown in Figure 13. [Figure 15] Figure 15 is a perspective view showing an example of a first jig 160 that contacts the first contact surface 133a of the eccentric roller 130. [Figure 16] Figure 16 is a side view of the first jig 160 shown in Figure 15. [Figure 17]Figure 17 is a cross-sectional view showing the first jig 160 shown in Figure 15 in contact with the eccentric roller 130. [Figure 18] Figure 18 is a perspective view showing an example of a second jig 170 that contacts the second contact surface 133b of the eccentric roller 130. [Figure 19] Figure 19 is a side view of the second jig 170 shown in Figure 18. [Figure 20] Figure 20 is a cross-sectional view showing the second jig 170 shown in Figure 18 in contact with the eccentric roller 130. [Figure 21] Figure 21 shows an example of a third jig 180 that contacts the third contact surface 133c of the eccentric roller 130. [Modes for carrying out the invention]

[0027] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the directions are referred to as "upward," "downward," "leftward," "rightward," "forward," and "backward," but these directions are relative directions set for the lens device shown in each figure for the sake of explanation.

[0028] <Lens device 100 of this embodiment> Figure 1 is a perspective view showing an example of the lens device 100 of this embodiment. The lens device 100 is applied to, for example, a digital camera or single-lens reflex camera capable of capturing video. The camera is an example of the "imaging device" of the present invention. The lens device 100 is detachable from, for example, the body of a camera with interchangeable lenses. Alternatively, the lens device 100 may be a lens included in a camera with an integrated lens. The lens device 100 is configured in a substantially cylindrical shape as a whole.

[0029] Lens 101 is at least one of the optical lenses provided by the lens device 100 and is an example of the "first lens" of the present invention. In the drawings, the shape of lens 101 is shown in a simplified form. Optical axis X is the optical axis of the optical lenses of the lens device 100, including lens 101.

[0030] <Configuration for holding lens 101> Figure 2 is a perspective view showing an example of lens frames 111, 112, retaining frame 120, and eccentric roller 130 that hold the lens 101. Figure 3 is a front view of the lens frames 111, 112, retaining frame 120, and eccentric roller 130 shown in Figure 2. Figure 4 is a perspective view of the lens frames 111, 112 shown in Figure 2. Figure 5 is a perspective view of the retaining frame 120 shown in Figure 2.

[0031] The lens device 100 includes, for example, lens frames 111, 112, a retaining frame 120, and an eccentric roller 130, as shown in Figure 2. The lens frames 111, 112 are fixed to each other and are substantially annular members that hold the lens 101. Specifically, the outer circumference of the lens 101 is fixed to the inner circumference of the lens frames 111, 112.

[0032] The lens frame 112 is provided with screw holes 112a, 112b, and 112c at positions corresponding to the first elongated hole 121, the second elongated hole 122, and the pivot hole 123 of the retaining frame 120, which will be described later. The retaining frame 120 is a substantially annular member that holds the lens frames 111 and 112. The retaining frame 120 is fixed to the lens barrel of the lens device 100. Therefore, the retaining frame 120 is fixed to the camera body.

[0033] The relative positional relationship between the lens frame 112 and the retaining frame 120 is adjustable, as described later. By adjusting the relative positional relationship between the lens frame 112 and the retaining frame 120, the relative positional relationship of the lens 101 with respect to the lens barrel of the lens device 100 and the camera body can be adjusted.

[0034] The retaining frame 120 is provided with a first elongated hole 121, a second elongated hole 122, and a pivot hole 123. The first elongated hole 121, the second elongated hole 122, and the pivot hole 123 are provided along the optical axis X and are holes that penetrate the retaining frame 120 in a direction perpendicular (including nearly perpendicular) to the optical axis X. Note that the direction in which the first elongated hole 121, the second elongated hole 122, and the pivot hole 123 penetrate is not limited to the direction perpendicular to the optical axis X, but may also be inclined with respect to the direction perpendicular to the optical axis X.

[0035] The first elongated hole 121 is a shift adjustment hole for adjusting the shift position (in the direction perpendicular to the optical axis X) of the lens frame 112 relative to the retaining frame 120. The second elongated hole 122 is a tilt adjustment hole for adjusting the tilt (inclination) of the lens frame 112 relative to the retaining frame 120. Multiple first elongated holes 121 and second elongated holes 122 may be provided on the retaining frame 120. In the example in Figures 2 and 3, two first elongated holes 121 and three second elongated holes 122 are provided.

[0036] The pivot hole 123 is a hole that serves as a pivot point for fixing the lens frame 112 to the retaining frame 120. For example, by screwing a fixing screw 141 through the pivot hole 123 into a screw hole 112c (see Figure 4) provided in the lens frame 112, the lens frame 112 can be fixed to the retaining frame 120 at a single point in the pivot hole 123. The above-mentioned adjustments to the shift position and tilt are performed using this point as a pivot.

[0037] The eccentric roller 130 is a roller member whose center is off-center with respect to the axis of rotation (see Figure 9). The eccentric roller 130 is positioned in the first elongated hole 121 and the second elongated hole 122 of the retaining frame 120, and is rotatably fixed to the lens frame 112.

[0038] For example, the eccentric roller 130 positioned in the first elongated hole 121 is fixed to the lens frame 112 by screwing it into the screw hole 112a provided in the lens frame 112, thereby allowing the eccentric roller 130 to rotate. Similarly, the eccentric roller 130 positioned in the second elongated hole 122 is fixed to the lens frame 112 by screwing it into the screw hole 112b provided in the lens frame 112, thereby allowing the eccentric roller 130 to rotate.

[0039] <Shape of the first elongated hole 121> Figure 6 shows an example of the shape of the first elongated hole 121. The first elongated hole 121 is an elongated hole that extends in a first direction 121a (a direction parallel to the optical axis X) along the optical axis X. For example, the first elongated hole 121 has a shape that corresponds to the region through which a circle moving in the first direction 121a passes.

[0040] Because the first elongated hole 121 has a shape that extends in the first direction 121a, when the eccentric roller 130 inside the first elongated hole 121 is rotated, the lens frame 112 moves relative to the retaining frame 120 in a movement direction 121b that is perpendicular (including nearly perpendicular) to the first direction 121a. This makes it possible to adjust the shift position of the lens frame 112 (lens 101) relative to the retaining frame 120.

[0041] <Shape of the second elongated hole 122> Figure 7 shows an example of the shape of the second elongated hole 122. The second elongated hole 122 is an elongated hole that extends in the second direction 122a, which is the circumferential direction centered on the optical axis X. For example, the second elongated hole 122 has a shape that corresponds to the region through which a circle moving in the second direction 122a passes. The second direction 122a is a direction that is perpendicular (including nearly perpendicular) to the first direction 121a.

[0042] Because the second elongated hole 122 has a shape that extends in the second direction 122a, when the eccentric roller 130 inside the second elongated hole 122 is rotated, the lens frame 112 moves relative to the holding frame 120 in a movement direction 122b that is perpendicular (including nearly perpendicular) to the second direction 122a. This makes it possible to adjust the tilt of the lens frame 112 (lens 101) relative to the holding frame 120.

[0043] <Eccentric roller 130 and screw 140> Figure 8 is a perspective view showing the eccentric roller 130 and the screw 140. The eccentric roller 130 is made of resin, for example, but is not limited to resin and may be made of metal or the like. The eccentric roller 130 is fixed to the lens frame 112 so as to be rotatable by being screwed to the lens frame 112 by the screw 140. Specifically, the eccentric roller 130 has a through hole 132 that is in the same direction as the through-direction of the first elongated hole 121 and the second elongated hole 122.

[0044] The through hole 132 is a roughly cylindrical hole into which a screw 140 can be inserted. At least the tip of the screw 140 is provided with a screw groove that allows it to be screwed into the screw holes 112a and 112b of the lens frame 112.

[0045] The rotation axis 131 is the rotation axis of the eccentric roller 130, which is screwed in place by a screw 140. The eccentric roller 130 is fixed to the lens frame 112 so as to be rotatable around the rotation axis 131, but the rotation angle (rotation state) of the eccentric roller 130 relative to the lens frame 112 is maintained as long as the force rotating the eccentric roller 130 does not exceed a certain level due to the biasing force of the screw 140. This makes it possible to maintain the shift position and tilt state adjusted by the rotation of the eccentric roller 130.

[0046] Furthermore, after adjusting the lens 101 (adjusting the shift position and tilt), the eccentric roller 130 may be fixed in place with adhesive or the like to prevent it from rotating relative to the lens frame 112.

[0047] <Shape of the outer circumference of the eccentric roller 130> Figure 9 is a top view showing the shape of the outer circumference of the eccentric roller 130. In Figure 9, the outer circumference 130a of the eccentric roller 130 is shown as viewed from the direction of the rotation axis 131 of the eccentric roller 130. As shown in Figure 9, the eccentric roller 130 is an eccentric roller member in which the outer circumference 130a, as viewed from the rotation axis 131, is not a perfect circle centered on the rotation axis 131. Due to the shape of this eccentric roller 130 and the shapes of the first elongated hole 121 and the second elongated hole 122, the relative positional relationship between the lens frame 112 and the retaining frame 120 can be changed in accordance with the rotation of the eccentric roller 130.

[0048] Furthermore, in Figure 9, the four regions divided by the first axis 11 and the second axis 12, which intersect at the rotation axis 131, are designated as the first region 21, the second region 22, the third region 23, and the fourth region 24 in a clockwise direction. The outer circumference 130a has one tangent line 31 parallel to the first axis 11 in the first region 21, one tangent line 32 parallel to the second axis 12 in the second region 22, one tangent line 33 parallel to the second axis 12 in the third region 23, and one tangent line 34 parallel to the first axis 11 in the fourth region 24. In other words, the outer circumference 130a of the eccentric roller 130 is roughly heart-shaped with rounded corners.

[0049] Contact point 31a is the point of contact between the outer circumference 130a and the tangent wire 31. Contact point 32a is the point of contact between the outer circumference 130a and the tangent wire 32. Contact point 33a is the point of contact between the outer circumference 130a and the tangent wire 33. Contact point 34a is the point of contact between the outer circumference 130a and the tangent wire 34. Note that contact points 32a and 33a are different points from each other.

[0050] <Relationship between the rotation angle of the eccentric roller 130 and the offset amount of the lens frame 112 relative to the retaining frame 120> Figure 10 shows an example of the relationship between the rotation angle of the eccentric roller 130 and the offset amount of the lens frame 112 relative to the retaining frame 120. In Figure 10, the horizontal axis represents the rotation angle of the eccentric roller 130, and the vertical axis represents the offset amount of the lens frame 112 relative to the retaining frame 120. The offset amount is the deviation of the relative position of the lens frame 112 relative to the retaining frame 120 from a predetermined reference position.

[0051] The offset amount of the lens frame 112 relative to the retaining frame 120 is the offset amount in the shift direction (movement direction 121b) for the eccentric roller 130 located in the first elongated hole 121, and the offset amount in the tilt direction (movement direction 122b) for the eccentric roller 130 located in the second elongated hole 122. Relationship 50 shows the relationship between the rotation angle [°] of the eccentric roller 130 and the offset amount of the lens frame 112 relative to the retaining frame 120.

[0052] As shown in Figure 9, the shape of the outer circumference 130a of the eccentric roller 130 allows the change in the offset amount (movement amount) of the lens frame 112 relative to the retaining frame 120 to be constant (including approximately constant) for a given rotation angle range of the eccentric roller 130 (a range from -90° to 90° in the example of Figure 10). In other words, the relative positional relationship between the lens frame 112 and the retaining frame 120 can be changed linearly (including approximately linearly) with respect to the amount of rotation of the eccentric roller 130.

[0053] Thus, the lens device 100 includes an eccentric roller 130 positioned in the first elongated hole 121 and the second elongated hole 122 provided in the retaining frame 120 that holds the lens frames 111 and 112, and fixed to the lens frame 112. This allows the shift position and tilt state of the lens frame 112 relative to the retaining frame 120 to be adjusted by the rotation of the eccentric roller 130.

[0054] Furthermore, since the configuration for adjusting the shift position (the first elongated hole 121 and the eccentric roller 130 positioned in the first elongated hole 121) and the configuration for adjusting the tilt (the second elongated hole 122 and the eccentric roller 130 positioned in the second elongated hole 122) are independent, the influence of each adjustment on the others is suppressed, making it easier to adjust the lens 101.

[0055] Furthermore, in a view of the rotation axis 131 of the eccentric roller 130, the outer circumference 130a of the eccentric roller 130 is divided into four regions by the first axis 11 and the second axis 12 intersecting the rotation axis 131. In the first region 21, there is one tangent line 31 along the first axis 11; in the second region 22, there is one tangent line 32 along the second axis 12; in the third region 23, there is one tangent line 33 along the second axis 12; and in the fourth region 24, there is one tangent line 34 along the first axis 11.

[0056] This makes it possible to linearly change the relative positional relationship between the lens frame 112 and the retaining frame 120 in relation to the amount of rotation of the eccentric roller 130. Compared to a configuration in which the relative positional relationship between the lens frame 112 and the retaining frame 120 changes non-linearly, this simplifies control when the rotation of the eccentric roller 130 is performed automatically by a robot, and makes the adjustment work more intuitive when the rotation of the eccentric roller 130 is performed manually by a human. As a result, the adjustment of the lens 101 can be made easier.

[0057] <First biasing member that biases the lens frame 112 relative to the retaining frame 120> Figure 11 is a cross-sectional view showing an example of a first biasing member that biases the lens frame 112 relative to the retaining frame 120. In Figure 11, a portion of the lens frame 112 and the retaining frame 120 are shown as viewed from the direction of the optical axis X (from the front).

[0058] The lens device 100 may include a first biasing member 151. The first biasing member 151 is a spring, such as a leaf spring or a torsion coil spring. The first biasing member 151 is provided in the gap between the lens frame 112 and the retaining frame 120, and biases the lens frame 112 relative to the retaining frame 120 along a third direction 151a (towards the optical axis X). The third direction 151a is a direction perpendicular to the first direction 121a shown in Figure 6 and the second direction 122a shown in Figure 7 (a direction perpendicular to the optical axis X).

[0059] By providing the first biasing member 151, rattle (play) in the third direction 151a between the lens frame 112 and the retaining frame 120 can be suppressed. As a result, even if there is rattle (play) between the eccentric roller 130 and the first elongated hole 121, for example, because the eccentric roller 130 provided in the first elongated hole 121 is made of metal and does not easily undergo elastic deformation, it is possible to suppress the situation in which the shift position after adjustment is misaligned.

[0060] <Second biasing member that biases the lens frame 112 relative to the retaining frame 120> Figure 12 is a cross-sectional view showing an example of a second biasing member that biases the lens frame 112 relative to the retaining frame 120. In Figure 12, a portion (upper part) of the cross-section obtained by cutting the lens frame 112, retaining frame 120, eccentric roller 130, and screw 140 with a plane passing through the optical axis X and parallel to the vertical direction is shown.

[0061] The lens device 100 may include a second biasing member 152. The second biasing member 152 is a spring, such as a leaf spring or a torsion coil spring. The second biasing member 152 is provided in the gap between the lens frame 112 and the retaining frame 120, and biases the lens frame 112 relative to the retaining frame 120 along the first direction 121a (forward direction). The first direction 121a is the direction along the optical axis X (parallel to the optical axis X), as explained in Figure 6.

[0062] By providing the second biasing member 152, rattle (play) in the first direction 121a between the lens frame 112 and the retaining frame 120 can be suppressed. As a result, even if there is rattle (play) between the eccentric roller 130 and the second elongated hole 122, for example, because the eccentric roller 130 provided in the second elongated hole 122 is made of metal and does not easily undergo elastic deformation, it is possible to suppress the situation in which the tilt state after adjustment is misaligned.

[0063] Thus, the lens device 100 may include a biasing member that biases the lens frame 112 relative to the retaining frame 120 in a direction perpendicular to the extending direction of the elongated holes (first elongated hole 121 and second elongated hole 122). For example, the lens device 100 includes a first biasing member 151 that biases the lens frame 112 relative to the retaining frame 120 along a third direction 151a. The lens device 100 also includes a second biasing member 152 that biases the lens frame 112 relative to the retaining frame 120 in a direction along the first direction 121a.

[0064] This makes it possible to suppress situations where the adjusted shift position or tailing state is misaligned, even when the eccentric roller 130 is made of metal and does not easily undergo elastic deformation. Furthermore, a configuration in which multiple first biasing members 151 are provided at different positions is also possible. Alternatively, a configuration in which multiple second biasing members 152 are provided at different positions is also possible. Furthermore, a configuration in which only either the first biasing member 151 or the second biasing member 152 is provided is also possible.

[0065] <Contact area of ​​eccentric roller 130> Figure 13 is a perspective view of the eccentric roller 130 to illustrate an example of the contact portion of the eccentric roller 130. Figure 14 is a top view of the eccentric roller 130 shown in Figure 13. In the eccentric roller 130, the direction opposite to the lens frame 112 and the optical axis X is defined as the upward direction (upper side). As shown in Figures 13 and 14, the upper surface of the eccentric roller 130 is provided with a first contact surface 133a, a second contact surface 133b, and a third contact surface 133c.

[0066] The first contact surface 133a, the second contact surface 133b, and the third contact surface 133c are contact parts that come into contact with different jigs. These different jigs are jigs with different shapes at the tip that comes into contact with the eccentric roller 130 (see, for example, Figures 15 to 21).

[0067] The first contact surface 133a is a substantially annular, substantially planar surface perpendicular to the rotation axis 131. This first contact surface 133a comes into contact with the first jig 160 (see Figures 15 to 17), which will be described later.

[0068] The eccentric roller 130 is provided with four wall portions 134 extending upward from the outer circumference of the first contact surface 133a. The four wall portions 134 are arranged at equal intervals on a circle centered on the rotation axis 131.

[0069] The second contact surfaces 133b are four substantially flat surfaces located above the first contact surface 133a. These second contact surfaces 133b come into contact with the second jig 170 (see Figures 18 to 20), which will be described later. In this example, the second contact surfaces 133b are the upper surfaces of the four wall portions 134. Therefore, the four second contact surfaces 133b are arranged at equal intervals on a circle centered on the rotation axis 131. Four holes 135 (holes with bottoms) are provided on the outer circumference of the four second contact surfaces 133b. In this example, the four holes 135 are substantially cylindrical in shape.

[0070] The third contact surfaces 133c are four substantially flat surfaces located on the outer circumference of the four second contact surfaces 133b. These third contact surfaces 133c come into contact with the third jig 180 (see Figure 21), which will be described later. In this example, the third contact surfaces 133c are the bottom surfaces of the four holes 135. Therefore, the four third contact surfaces 133c are arranged at equal intervals on a circle centered on the rotation axis 131.

[0071] <First jig 160 that contacts the first contact surface 133a of the eccentric roller 130> Figure 15 is a perspective view showing an example of a first jig 160 that contacts the first contact surface 133a of the eccentric roller 130. Figure 16 is a side view of the first jig 160 shown in Figure 15. Figure 17 is a cross-sectional view showing the first jig 160 shown in Figure 15 in contact with the eccentric roller 130. In Figure 17, a portion of the cross-section of the first jig 160 and the eccentric roller 130, which are in contact with each other, is shown, cut by a plane including the rotation axis 131.

[0072] The first jig 160 shown in Figures 15 and 16 is a bit used, for example, by being attached to an adjustment robot or a bit driver. The tip 160a of the first jig 160 is the part that contacts the eccentric roller 130. The tip 160a has a roughly frustoconical shape that tapers towards the tip, and is provided with a roughly cross-shaped groove.

[0073] The rotation axis 161 of the first jig 160 is the central axis of the first jig 160, and the first jig 160 has a shape that is approximately point-symmetric with respect to the rotation axis 161. The first jig 160 is configured to come into contact with the eccentric roller 130 by inserting it into the eccentric roller 130 with the rotation axis 131 of the eccentric roller 130 and the rotation axis 161 of the first jig 160 coinciding.

[0074] The four leading edges of the tip portion 160a become contact surfaces 162 that contact the first contact surface 133a of the eccentric roller 130 in the direction of the rotation axis 161 (rotation axis 131). The contact surface 162 is a substantially plane perpendicular to the rotation axis 161, and when the tip portion 160a of the first jig 160 is inserted into the eccentric roller 130, it abuts against the first contact surface 133a.

[0075] Furthermore, the four protrusions (including the contact surfaces 162) formed by the roughly cross-shaped grooves of the tip portion 160a fit between each of the four wall portions 134 of the eccentric roller 130. These four protrusions of the tip portion 160a are chamfered so that they become lower as they approach the rotation axis 161. In addition, the four protrusions of the tip portion 160a contact the sides of the four wall portions 134 of the eccentric roller 130 in a circumferential direction (contact in the rotation direction) with respect to the rotation axis 161 (rotation axis 131). As a result, by rotating the first jig 160 around the rotation axis 161 with the four contact surfaces 162 of the tip portion 160a in contact with the first contact surface 133a of the eccentric roller 130, the eccentric roller 130 can be rotated around the rotation axis 131.

[0076] Furthermore, the depth D1 (length in the direction of the rotation axis 161) of the roughly cross-shaped groove at the tip portion 160a is greater than the height (length in the direction of the rotation axis 131) of the wall portion 134 of the eccentric roller 130. Therefore, the tip portion 160a of the first jig 160 does not come into contact with the second contact surface 133b of the eccentric roller 130.

[0077] <Second jig 170 that contacts the second contact surface 133b of the eccentric roller 130> Figure 18 is a perspective view showing an example of a second jig 170 that contacts the second contact surface 133b of the eccentric roller 130. Figure 19 is a side view of the second jig 170 shown in Figure 18. Figure 20 is a cross-sectional view showing the second jig 170 shown in Figure 18 in contact with the eccentric roller 130. In Figure 20, a portion of the cross-section of the second jig 170 and the eccentric roller 130, which are in contact with each other, is shown, cut by a plane including the rotation axis 131.

[0078] The second jig 170 shown in Figures 18 to 20 is a bit that, like the first jig 160, is used by being attached to, for example, an adjustment robot or a bit driver. The tip 170a of the second jig 170 is the part that contacts the eccentric roller 130. The tip 170a has a roughly frustoconical shape that tapers towards the tip, and is provided with a roughly cross-shaped groove.

[0079] The rotation axis 171 of the second jig 170 is the central axis of the second jig 170, and the second jig 170 has a shape that is approximately point-symmetric with respect to the rotation axis 171. The second jig 170 is configured to come into contact with the eccentric roller 130 by inserting it into the eccentric roller 130 with the rotation axis 131 of the eccentric roller 130 and the rotation axis 171 of the second jig 170 coinciding.

[0080] The bottom surface of the roughly cross-shaped groove provided on the tip portion 170a becomes a contact surface 172 that contacts the second contact surface 133b of the eccentric roller 130 in the direction of the rotation axis 171 (rotation axis 131). The contact surface 172 is a roughly plane perpendicular to the rotation axis 171 (rotation axis 131), and when the tip portion 170a of the second jig 170 is inserted into the eccentric roller 130, it abuts against the second contact surface 133b.

[0081] Furthermore, the four protrusions formed by the roughly cross-shaped grooves on the tip portion 170a fit between each of the four wall portions 134 of the eccentric roller 130. These four protrusions are chamfered so that they become lower as they approach the rotation axis 171. In addition, these four protrusions on the tip portion 170a contact the sides of the four wall portions 134 of the eccentric roller 130 in the circumferential direction (contact in the rotation direction) with respect to the rotation axis 171 (rotation axis 131). As a result, by rotating the second jig 170 around the rotation axis 171 with the contact surface 172 of the tip portion 170a in contact with the second contact surface 133b of the eccentric roller 130, the eccentric roller 130 can be rotated around the rotation axis 131.

[0082] Furthermore, the depth D2 (length in the direction of the rotation axis 171) of the roughly cross-shaped groove of the tip portion 170a is shorter than the height (length in the direction of the rotation axis 131) of the wall portion 134 of the eccentric roller 130. Therefore, the tip portion 170a of the second jig 170 does not come into contact with the first contact surface 133a of the eccentric roller 130.

[0083] Thus, the eccentric roller 130 has a first contact surface 133a that can contact only the first jig 160 of the two jigs 170 in the direction along the rotation axis 131, and a second contact surface 133b that can contact only the second jig 170 of the two jigs 170 in the direction along the rotation axis 131.

[0084] Thus, the eccentric roller 130 has multiple contact surfaces (first contact surface 133a, second contact surface 133b, and third contact surface 133c) that come into contact with multiple jigs (first jig 160, second jig 170, and third jig 180) that rotate the eccentric roller 130.

[0085] <Third jig 180 that contacts the third contact surface 133c of the eccentric roller 130> Figure 21 shows an example of a third jig 180 that contacts the third contact surface 133c of the eccentric roller 130.

[0086] The third jig 180 is an adjustment tool that is used, for example, by being grasped by a human hand. The third jig 180 is shaped like tweezers and has two elongated arms 182 extending from its base. Such an adjustment tool is sometimes called a crab-eye tool.

[0087] The rotation axis 181 of the third jig 180 is the central axis of the third jig 180, and the third jig 180 has a shape that is approximately point-symmetric with respect to the rotation axis 181. The third jig 180 is configured such that when the third jig 180 is in contact with the eccentric roller 130, the rotation axis 131 of the eccentric roller 130 and the rotation axis 181 of the third jig 180 coincide.

[0088] The tips of the two arms 182 become two tip portions 183 that contact the third contact surface 133c of the eccentric roller 130 in the direction of the rotation axis 181 (rotation axis 131). For example, when the third jig 180 is inserted so that the two arms 182 each fit into two of the four holes 135 of the eccentric roller 130 that are symmetrically positioned with respect to the rotation axis 131, the two tip portions 183 abut against the two third contact surfaces 133c of the eccentric roller 130.

[0089] Furthermore, since the two arms 182 fit into the two holes 135, they come into contact with the inner walls of the two holes 135 in a circumferential direction (in the rotational direction) around the rotation axis 181 (rotation axis 131). As a result, by rotating the third jig 180 around the rotation axis 181 with the tip portion 183 in contact with the third contact surface 133c of the eccentric roller 130, the eccentric roller 130 can be rotated around the rotation axis 131.

[0090] Thus, the eccentric roller 130 has two pairs of holes 135 (third contact surfaces 133c) arranged symmetrically around the rotation axis 131, into which the two tip portions 183 of the third jig 180 can be inserted. Note that the number of holes 135 (third contact surfaces 133c) is not limited to two pairs; it may be one pair or three or more pairs.

[0091] As explained in Figures 13 to 21, the eccentric roller 130 has multiple contact points that come into contact with multiple jigs that rotate the eccentric roller 130. As an example of "multiple contact points," the eccentric roller 130 has been described as having a first contact surface 133a, a second contact surface 133b, and a third contact surface 133c, but the eccentric roller 130 may also have a configuration with only two of these contact surfaces. With such a configuration, the lens 101 can be adjusted using jigs that are appropriate to the adjustment status of the lens device 100, such as the equipment of the facility that adjusts the lens device 100 and the skill level of the worker who adjusts the lens device 100. This allows for more flexible lens adjustment.

[0092] <Variation> We have described how to adjust the relative positional relationship between the retaining frame 120 and the lens frame 112 by adjusting the shift position of the lens frame 112 relative to the retaining frame 120 and adjusting the tilt state of the lens frame 112 relative to the retaining frame 120. However, it is also possible to perform only one of these adjustments.

[0093] Furthermore, although a configuration in which the retaining frame 120 is provided with a first elongated hole 121 and a second elongated hole 122 and the eccentric roller 130 is fixed to the lens frames 111 and 112 has been described, the configuration is not limited to this. For example, the lens frames 111 and 112 (for example, lens frame 112) may be provided with a first elongated hole 121 and a second elongated hole 122 and the eccentric roller 130 may be fixed to the retaining frame 120. In this case, for example, the retaining frame 120 may be provided with screw holes similar to the screw holes 112a to 112c shown in Figure 4. [Explanation of symbols]

[0094] 11 1st axis 12 2nd axis 21 First area 22 Second area 23 Third area 24 4th area 31~34 Tangent line 31a, 32a, 33a, 34a contacts 50 relationships 100 Lens device 101 Lens 111,112 Lens frame 112a~112c screw hole 120 holding slots 121 1st long hole 121a 1st direction 121b,122b Movement direction 122 2nd long hole 122a 2nd direction 123 Pivot Hole 130 Eccentric Roller 130a Outer perimeter 131,161,171,181 Rotation axis 132 Through hole 133a 1st contact surface 133b Second contact surface 133c 3rd contact surface 134 Wall 135 Hole 140 screws 141 Fixing screws 151 First biasing member 151a 3rd direction 152 Second biasing member 160 First Jig 160a, 170a, 183 tip 162,172 Contact surface 170 Second Jig 180 Third Jig 182 Arm

Claims

1. A lens frame that holds the first lens, A retaining frame that holds the lens frame and has an elongated hole, The lens frame comprises an eccentric roller positioned in the elongated hole and fixed to the lens frame, In a view of the rotation axis of the eccentric roller, the outer circumference of the eccentric roller is divided into four regions by a first axis and a second axis intersecting the rotation axis, The first region has one tangent line along the first axis, The second region has one tangent line along the second axis, The third region has one tangent line along the second axis, The fourth region has one tangent line along the first axis, Lens device.

2. A lens device according to claim 1, The relative positional relationship between the lens frame and the retaining frame can be changed by the rotation of the eccentric roller. Lens device.

3. A lens device according to claim 2, The relative positional relationship between the lens frame and the retaining frame changes linearly with respect to the amount of rotation of the eccentric roller. Lens device.

4. A lens device according to claim 2, The amount of movement of the lens frame relative to the retaining frame is constant with respect to the amount of rotation of the eccentric roller. Lens device.

5. A lens device according to claim 1, The lens frame is provided with respect to the retaining frame in a direction different from the extending direction of the elongated hole, Lens device.

6. A lens device according to claim 1, The elongated hole comprises a first elongated hole extending in a first direction and a second elongated hole extending in a second direction different from the first direction. The eccentric roller is positioned in the first and second elongated holes, Lens device.

7. The lens device according to claim 6, The second direction is perpendicular to the first direction. Lens device.

8. The lens device according to claim 6, The first direction is the direction along the optical axis of the first lens. Lens device.

9. The lens device according to claim 6, The lens frame is provided with respect to the retaining frame in a direction different from the extending direction of the elongated hole, The biasing member is a first biasing member that biases the lens frame with respect to the holding frame along a third direction different from the first and second directions. Lens device.

10. A lens device according to claim 9, The biasing member further comprises a second biasing member that biases the lens frame along the first direction relative to the holding frame. Lens device.

11. The lens device according to claim 6, The first and second elongated holes are arranged along the optical axis of the first lens. Lens device.

12. A lens device according to claim 1, The eccentric roller has a plurality of contact parts that come into contact with a plurality of jigs that rotate the eccentric roller. Lens device.

13. A lens device according to claim 12, The aforementioned multiple jigs have different tip shapes. Lens device.

14. A lens device according to claim 12, The aforementioned plurality of jigs include a first jig and a second jig, The aforementioned contact portion is, In the direction along the rotation axis, a first contact surface is provided which only the first jig can contact among the first and second jigs, In the direction along the rotation axis, the following is a second contact surface that can be contacted only by the second jig among the first and second jigs: Lens device.

15. A lens device according to claim 14, The second contact surface is the upper surface of the wall portion extending from the first contact surface. The side surface of the wall portion is such that the first jig and the second jig can contact each other in the rotational direction. Lens device.

16. A lens device according to claim 15, The aforementioned wall portion is arranged in multiple locations along the rotation axis. Lens device.

17. A lens device according to claim 14, The plurality of jigs include a third jig having two tip portions, The contact portion has one or more pairs of holes into which the two tip portions can be inserted, positioned symmetrically with respect to the axis of rotation. Lens device.

18. An imaging device comprising a lens device according to any one of claims 1 to 17.

Images