Method for positioning lens barrel, imaging device, and optical lens

Abstract

To provide a lens barrel that is excellent in assemblability in assembling an optical lens, a holding member, and a hold-down member, and has good optical performance, an imaging apparatus, and a method for positioning an optical lens.SOLUTION: A lens barrel 10 comprises: a second stationary lens 310 that has a flange part 310j; a second stationary lens frame 320 that holds the second stationary lens 310; a cover 330 that holds down the second stationary lens 310 against the second stationary lens frame 320; and a positioning part 30 that performs positioning of the second stationary lens 310. The positioning part 30 has at least one projection 310b that is provided on the flange part 310j projecting in an optical axis O10 direction, and a recess 330c that is provided in the cover 330 opening toward the projection 310b side and into which the projection 310b is inserted. The recess 330c has a tapered surface 330t inclined with respect to the optical axis O10 direction, and is in contact with the projection 310b on the tapered surface 330t.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a lens barrel, an imaging device, and a positioning method for an optical lens.

Background Art

[0002] In recent years, for lens barrels, both miniaturization and cost reduction during manufacturing have been demanded. To achieve both of these goals, for example, there is a tendency to employ inexpensive plastic aspherical lenses having high optical performance. To fix a plastic aspherical lens to a lens barrel, methods such as providing a gap between the aspherical lens and the lens barrel for fixation, or fixing the lens with an adhesive are employed. With such fixing methods, the aspherical lens slightly shifts over time or due to environmental changes and the like, leading to deterioration of optical performance. As a configuration for preventing deterioration of optical performance, Patent Document 1 discloses a plastic lens holding mechanism including a plastic lens, a lens barrel, and a pressing ring that presses the plastic lens against the lens barrel. Further, in the plastic lens holding mechanism described in Patent Document 1, the pressing ring has a tongue-shaped spring portion, the lens barrel has a groove, and the plastic lens is fixed by the tongue-shaped spring portion engaging with the groove. Patent Document 2 discloses a lens module including a lens and a cylindrical lens barrel whose inner peripheral portion is fitted with the outer peripheral portion of the lens. Further, in the lens module described in Patent Document 2, the lens has a tapered rib, the lens barrel has a tapered groove, and the lens is fixed by the fitting between the tapered rib and the tapered groove and the fitting between the inner peripheral portion of the lens barrel and the outer peripheral portion of the lens.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

[0004] However, in the plastic lens holding mechanism described in Patent Document 1, the tongue-shaped spring is configured to engage with a groove, so if a force greater than the spring force of the tongue-shaped spring is applied, the plastic lens may shift position. As a result, the optical performance is impaired. Also, when assembling the push ring and lens barrel by engaging the tongue-shaped spring with the groove, it is necessary to rotate the push ring and lens barrel in opposite directions relative to each other. If too much force is applied during this rotation, for example, the tongue-shaped spring may break, resulting in poor assembly. In the lens module described in Patent Document 2, the lens is fixed by the fitting of a tapered rib and a tapered groove, and by the fitting of the inner circumference of the lens barrel and the outer circumference of the lens, so there is a risk of lens deformation or floating. As a result, the optical performance is impaired. Furthermore, such a lens fixing configuration requires high dimensional accuracy for each component and high assembly accuracy for the assembly of each component, resulting in poor assembly.

[0005] The present invention has been made in view of the above-mentioned problems. The present invention aims to provide a lens barrel, an imaging device, and a method for positioning an optical lens that have excellent assembly properties when assembling an optical lens, a holding member, and a pressing member, and that have good optical performance. [Means for solving the problem]

[0006] To achieve the above objective, the lens barrel of the present invention comprises an optical lens having a lens portion that functions as a lens, and a flange portion provided on the outer circumference of the lens portion and having an enlarged outer diameter, and the Flange part A holding member that holds on one side in the direction of the optical axis, and a fixed position in an orthogonal direction perpendicular to the optical axis by the holding member, and the holding member Flange section in the direction of the optical axis From the dipping side One side fart A pressing member that applies biasing force to hold down. and Prepare, Each of the holding member and the pressing member is provided with an opening that allows light passing through the lens portion to pass through, Of the flange portion and the retaining member 、 On the one hand teeth The above-mentioned optical axis direction is provided Ta-convex Department A , others to teeth The recess into which the aforementioned protrusion is inserted. A , at least one of the convex portion and the concave portion Included Inclined surface with respect to the optical axis but Contacting the other party Then, the optical lens is positioned relative to the retaining member. It is characterized by the following: [Effects of the Invention]

[0007] According to the present invention, the assembly of the optical lens, holding member, and pressing member is excellent, and the optical performance is good. [Brief explanation of the drawing]

[0008] [Figure 1] This is a longitudinal cross-sectional view showing the internal structure of a lens barrel according to the first embodiment of the present invention. [Figure 2] Figure 1 is an exploded perspective view of the lens barrel. [Figure 3] Figure 1 is a perspective view of the bearing in the lens barrel. [Figure 4] Figure 1 is a partially enlarged perspective view of the second fixed lens frame of the lens barrel shown. [Figure 5] This is a plan view showing the positional relationship between the second fixed lens frame and the bearing when viewed from the optical axis direction. [Figure 6] This is a longitudinal cross-sectional view showing the second fixed lens frame with the bearing incorporated. [Figure 7] This is a plan view from the image side showing the adjustment of the bearings using a jig (adjustment of the tilt of the focus group). [Figure 8] This is a perspective view from the image side showing the adjustment of the bearings using a jig (adjustment of the tilt of the focus group). [Figure 9] Figure 1 is a perspective view of the cover of the lens barrel shown. [Figure 10]It is a longitudinal sectional view taken along the optical axis direction showing a state where the convex portion of the second fixed lens is inserted into the concave portion of the cover. [Figure 11] It is a longitudinal sectional view of the lens barrel according to the second embodiment of the present invention, taken along the optical axis direction showing a state where the convex portion of the second fixed lens is inserted into the concave portion of the cover. MODE FOR CARRYING OUT THE INVENTION

[0009] Hereinafter, each embodiment of the present invention will be described in detail with reference to the drawings. However, the configurations described in the following embodiments are merely examples, and the scope of the present invention is not limited by the configurations described in the respective embodiments. For example, each component constituting the present invention can be replaced with one having any configuration capable of exerting the same function. In addition, any component may be added. Furthermore, any two or more configurations (features) among the respective embodiments can be combined.

[0010] <First Embodiment> Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 10. FIG. 1 is a longitudinal sectional view showing the internal structure of the lens barrel according to the first embodiment of the present invention. FIG. 2 is an exploded perspective view of the lens barrel shown in FIG. 1. The lens barrel 10 shown in FIG. 1 is used by being attached to an image pickup apparatus 1000. The lens barrel 10 may be configured to be detachable from the image pickup apparatus 1000, or may be fixed to restrict detachment. As shown in FIGS. 1 and 2, the lens barrel 10 includes a first fixed lens group 100, a focus group 200, a second fixed lens group 300, a shake correction group 500, an aperture unit 600, a first adjustment lens group 700, and a second adjustment lens group 800.

[0011] The first fixed lens group 100 includes a first fixed lens 110, a first fixed lens frame (first holding member) 120, a main guide bar 130, and a sub guide bar 140. Note that the longitudinal cross-sectional view of FIG. 1 shows the structure of the lens barrel 10 when cut along a plane including the main guide bar 130 and the sub guide bar 140. The first fixed lens 110 is held concentrically with the first fixed lens frame 120 inside the cylindrical first fixed lens frame 120. The first fixed lens frame 120 does not need to hold the first fixed lens 110 if it is not required for optical design. Details of the main guide bar 130 and the sub guide bar 140 will be described later. The first fixed lens group 100 includes a drive source 150, an FPC 170, a coil 180, a first magnetic shield sheet metal 190, and a second magnetic shield sheet metal 195. The first fixed lens frame 120 holds a pair of coils 180 and a pair of first magnetic shield sheet metals 190. In this held state, the pair of coils 180 and the pair of first magnetic shield sheet metals 190 are arranged in the same phase as a pair of shake correction magnets 530 and a pair of yokes 540 held by a shake correction lens frame 520 constituting a shake correction group 500. Further, the first fixed lens frame 120 is configured to cover the first magnetic shield sheet metal 190 Placed and holds the second magnetic shield sheet metal 195.

[0012] As shown in Figure 1, the first fixed lens frame 120 has a main guide holder 120a and a sub-guide holder 120b. The main guide holder 120a holds the main guide bar 130 by inserting one end of the main guide bar 130 on the subject side. The sub-guide holder 120b holds the sub-guide bar 140 by inserting one end of the sub-guide bar 140 on the subject side. The first fixed lens frame 120 is also provided with ball receiving surfaces (not shown) that contact three balls (not shown) arranged at equal angular intervals around the optical axis O10 of the lens barrel 10 (lens portion 310a). The first fixed lens frame 120 is also provided with a hook (not shown) that engages with one end of a thrust spring (not shown). As shown in Figure 2, the first fixed lens frame 120 holds the second adjustment lens group 800 on the subject side via a plurality of second adjustment rollers 830. The second adjustment lens group 800 holds the first adjustment lens group 700 via a plurality of first adjustment rollers 730. The first adjustment lens group 700 includes a first adjustment lens 710, a first adjustment lens frame 720, a first adjustment roller 730, and a first adjustment lens group screw (not shown). The second adjustment lens group 800 includes a second adjustment lens 810, a second adjustment lens frame 820, a second adjustment roller 830, a first adjustment roller insertion part 840, and a second adjustment lens group screw (not shown). The outermost part of the first adjustment roller 730 is eccentric with respect to the center of the first adjustment lens group screw and is fitted with the first adjustment roller insertion part 840 of the second adjustment lens frame 820. By rolling the first adjustment roller 730, the first adjustment lens 710 can be moved to a desired position relative to the second adjustment lens 810 and positioned. Similarly, the outermost part of the second adjustment roller 830 is eccentric with respect to the center of the second adjustment lens group screw and is fitted with the second adjustment roller insertion part 120c of the first fixed lens frame 120. By rolling the second adjustment roller 830, the second adjustment lens 810 can be moved to a desired position relative to the first fixed lens frame 120 and positioned. Then, by adjusting the inclination and eccentricity of the first adjustment lens 710 and the second adjustment lens 810 with respect to the optical axis O10, good optical performance can be obtained in the lens barrel 10.

[0013] As shown in Figures 1 and 2, the second fixed lens group 300 includes a second fixed lens (optical lens) 310, a second fixed lens frame (holding member) 320, a cover (pressing member) 330, a screw 340, and a bearing (second holding member) 400. The second fixed lens 310 has a lens portion 310a located in its center that functions as a lens, and a flange portion 310j located on the outer circumference of the lens portion 310a with an enlarged outer diameter. The second fixed lens 310 also has three protrusions 310b on the flange portion 310j that project toward the image side (the other side) in the direction of the optical axis O10. In the configuration shown in Figure 2, the three protrusions 310b are arranged at equal intervals along the circumferential direction of the flange portion 310j, that is, at equal angular intervals around the optical axis O10. Each protrusion 310b constitutes a positioning section 30 that positions the second fixed lens 310 relative to the cover 330 (optical lens positioning method). The number of protrusions 310b is not limited to three; for example, there may be one, two, or four or more, but three or more are preferred.

[0014] The second fixed lens frame 320 is composed of a cylindrical or ring-shaped member. Inside the second fixed lens frame 320, the second fixed lens 310 is held from the subject side (one side) in the direction of the optical axis O10. The second fixed lens frame 320 has an opening 320a into which the bearing 400 is inserted, and a sub-guide holding portion 320b into which the other end of the sub-guide bar 140 is inserted.

[0015] A cover 330 is positioned on the image side (the other side) of the second fixed lens 310 in the direction of the optical axis O10. The cover 330 is made up of a cylindrical or ring-shaped member and has a plurality of arms (biasing parts) 330a provided on its outer circumference. These arms 330a are arranged at equal intervals along the circumferential direction of the cover 330. Each arm 330a protrudes in an arc shape along the circumferential direction of the cover 330 and is elastic. Each arm 330a engages with an engaging part 320m provided on the second fixed lens frame 320. This allows the second fixed lens 310 to be biased and held in place by the second fixed lens frame 320 toward the subject in the direction of the optical axis O10. Furthermore, the engagement of the arms 330a and the engaging part 320m connects the cover 330 to the second fixed lens frame 320. Furthermore, the cover 330 has a fitting portion 330g that fits with a plurality of outer peripheral fitting portions 320n provided on the outer circumference of the second fixed lens frame 320. Each outer peripheral fitting portion 320n and each fitting portion 330g are arranged at equal angular intervals around the optical axis O10 and fit together. As a result, the cover 330 is fixed in a position perpendicular to the direction of the optical axis O10 (hereinafter simply referred to as the "orthogonal direction") by the second fixed lens frame 320.

[0016] As shown in Figures 1 and 2, the focus group 200 is positioned as a linearly moving group between the first fixed lens group 100 and the second fixed lens group 300 in the direction of the optical axis O10. The focus group 200 includes a focus lens 210, a focus lens frame (lens holder) 220, a rack 230, a rack spring 240, and a mask 250. The focus lens frame 220 is slidably inserted into the main guide bar 130. hand , Main guide bar 130 andThe rack 230 has a mating portion 220a that engages with the main guide bar 130 and a vibration-preventing portion 220b that engages with the sub-guide bar 140. The rack 230 is rotatably held on the focus lens frame 220. The rack 230 is also biased by the biasing force of the rack spring 240 towards a lead screw 150a provided on the output shaft of the drive source 150. When the drive source 150 is energized via the FPC 170, the focus group 200 is guided by the main guide bar 130 and the sub-guide bar 140, and moves to a predetermined position in the direction of the optical axis O10 due to the engagement of the lead screw 150a and the rack 230. As a result, the optical system of the lens barrel 10 is in focus with respect to the subject. The optical image in focus with respect to the subject is formed on the imaging surface of an image sensor (not shown), such as a CMOS sensor, provided on the imaging device 1000 to which the lens barrel 10 is mounted. The image sensor generates image data by photoelectric conversion. For example, a stepping motor can be used as the drive source 150, but it is not limited to this.

[0017] As shown in Figure 1, the image stabilization group 500 includes an image stabilization lens 510, an image stabilization lens frame 520, a pair of image stabilization magnets 530, a pair of yokes 540, and a pair of position detection magnets (not shown). The image stabilization lens 510, the pair of image stabilization magnets 530, the pair of yokes 540, and the pair of position detection magnets are held in the image stabilization lens frame 520. The pair of image stabilization magnets 530 are positioned on opposite sides of each other across the optical axis O10. The pair of yokes 540 are positioned on the subject side in the direction of the optical axis O10, and the pair of image stabilization magnets 530 to They are arranged opposite each other. A pair of position-detecting magnets are positioned on opposite sides of each other via the optical axis O10, and a pair of vibration-correcting magnets 530 toThey are facing each other. In addition, the vibration correction group 500 is provided with a position detection magnet, but is not limited to this, and for example, depending on the configuration of the vibration correction group 500, the vibration correction magnet 530 may also be used as a position detection magnet. The vibration correction lens frame 520 is provided with a ball receiving surface portion (not shown) that contacts each of the three balls, and a hook (not shown) that engages with the other end of the thrust spring. Due to the biasing force of the thrust spring, the ball is sandwiched between the ball receiving surface portion of the first fixed lens frame 120 and the ball receiving surface portion of the vibration correction lens frame 520. As a result the ball can roll, and therefore the vibration correction lens frame 520 can move in the orthogonal direction.

[0018] The aperture unit 600 is positioned on the subject side of the image stabilization group 500 and is held in place by a screw (not shown) on the second fixed lens frame 320.

[0019] Next, a correction method for correcting image blur in the lens barrel 10 will be described. As mentioned above, the lens barrel 10 is provided with a pair of shake correction magnets 530, a pair of coils 180, and a pair of first magnetic shielding sheets 190, all arranged in the same phase. The lens barrel 10 is also provided with a flexible substrate (not shown). A position detection magnet and a pair of Hall elements, all arranged in the same phase as the position detection magnet, are mounted on this flexible substrate. When the coil 180 is energized, the Lorentz force generated between the coil 180 and the shake correction magnet 530 causes the shake correction group 500 to move in a direction orthogonal to the first fixed lens group 100. The Hall elements detect the magnetic force of the position detection magnet. The imaging device 1000 control unit (not shown) can calculate the position of the shake correction group 500 relative to the first fixed lens group 100 based on the detection results from the Hall elements. Furthermore, the control unit of the imaging device 1000 controls the voltage applied to the coil 180 based on image blur information from the lens barrel 10 or a gyro sensor (not shown) provided on the imaging device 1000. This control allows the blur correction group 500 to be moved in one of the orthogonal directions in which image blur correction is possible. As a result, even if vibrations such as camera shake occur during shooting, still images or moving images with corrected image blur of the subject can be obtained.

[0020] When the coil 180 is energized, a magnetic field is generated between the coil 180 and the vibration correction magnet 530. The first magnetic shield sheet 190 prevents this magnetic field from affecting the image sensor. Furthermore, to further enhance the magnetic shielding effect of the first magnetic shield sheet 190, a second magnetic shield sheet 195 is positioned on the image sensor side of the first magnetic shield sheet 190. In this embodiment, the second magnetic shield sheet 195 is integrally configured to cover the pair of first magnetic shield sheets 190, but it is not limited to this configuration, and may be divided into multiple parts, for example, depending on the arrangement of each first magnetic shield sheet 190.

[0021] Next, we will explain the adjustment method for adjusting the tilt of the focus group 200. Figure 3 is a perspective view of the bearing of the lens barrel shown in Figure 1. The direction in which the bearing 400 is viewed is different in Figure 3(a) and Figure 3(b). Figure 4 is a partially enlarged perspective view of the second fixed lens frame of the lens barrel shown in Figure 1. The direction in which the second fixed lens frame 320 is viewed is different in Figure 4(a) and Figure 4(b).

[0022] As shown in Figures 3(a) and (b), the bearing 400 has a cylindrical body portion 400j, a plurality of flange portions 400a integrally formed on the outer circumference 400i of the body portion 400j, and a plurality of projections 400b on the outer circumference 400i of the body portion 400j. The plurality of flange portions 400a are arranged at equal intervals along the circumferential direction on one end of the body portion 400j. Each flange portion 400a also protrudes in an orthogonal direction. The number of flange portions 400a is 3 in the configuration shown in Figure 3, but is not limited to this. The plurality of projections 400b are arranged at equal intervals along the circumferential direction on the other end of the body portion 400j. Each projection 400b also protrudes in an orthogonal direction. The number of projections 400b is the same as the number of flange portions 400a, i.e., 3, in the configuration shown in Figure 3, but is not limited to this. When viewed from the direction of the optical axis O10, the flange portion 400a and the projection portion 400b are positioned so as not to overlap. A retaining portion 400c is provided on the projection portion 400b side of the bearing 400 for holding the other end (imaging plane side) of the main guide bar 130.

[0023] Each flange portion 400a has a fitting surface 400d that is curved in an arc shape around the central axis of the main body portion 400j at its outermost edge. Each flange portion 400a has a contact surface 400e on the projection 400b side that contacts the contact surface 320c (see Figure 4(a)) of the second fixed lens frame 320. Both the contact surface 320c and the contact surface 400e are planes parallel to the orthogonal direction. Near the outer edge of the surface of the flange portion 400a opposite to the contact surface 400e, there is a groove (hereinafter referred to as "adhesion groove 400f") used for bonding with the second fixed lens frame 320. The main body portion 400j has a jig receiving surface 400g between adjacent flange portions 400a, against which a jig 20 (see Figure 7) used when adjusting the tilt of the focus group 200 abuts. The jig receiving surface 400g is an inclined plane tilted with respect to the central axis of the main body 400j. Each projection 400b is provided in the same phase as each jig receiving surface 400g. The projections 400b and the jig receiving surface 400g are provided in the same phase, but are not limited to this. 。 A regulating surface 400h is provided on the flange portion 400a side of each projection 400b. The regulating surface 400h is a plane parallel to the orthogonal direction.

[0024] As shown in Figures 4(a) and (b), the second fixed lens frame 320 has abutment surface 320c that abuts against the abutment surface 400e of the bearing 400, and a notch 320d into which the projection 400b of the bearing 400 is inserted. The second fixed lens frame 320 also has a plurality of fitting surfaces 320e facing the opening 320a, and an inner wall 320h provided between adjacent fitting surfaces 320e. Both the fitting surfaces 320e and the inner wall 320h are curved in an arc shape with respect to the central axis of the opening 320a. The second fixed lens frame 320 has a first adhesive portion 320f provided in phase with the fitting surface 320e, and a second adhesive portion 320g provided in phase with the inner wall 320h. The second fixed lens frame 320 has a regulating surface 320i provided on the back side of the abutment surface 320c. The regulatory surface 320i is a plane parallel to the orthogonal direction.

[0025] To assemble the bearing 400 and the second fixed lens frame 320 with this configuration, first, one end of the main guide bar 130 on the subject side is inserted into the main guide holding portion 120a of the first fixed lens frame 120. At the same time as this insertion, one end of the sub-guide bar 140 on the subject side is inserted into the sub-guide holding portion 120b. Before doing so, the fitting portion 220a of the focus lens frame 220, which incorporates the focus lens 210, rack 230, rack spring 240, and mask 250, is inserted. fart Main guide bar 130 of Insert it. This incorporates the focus group 200 into the first fixed lens group 100. Next, the drive source 150 and FPC 170 are assembled from the side of the second fixed lens frame 320 so that the rack 230 and lead screw 150a engage, and then fixed to the second fixed lens frame 320 with screws 160. Then, the second fixed lens frame 320 is incorporated into the first fixed lens group 100 while inserting the other end of the subguide bar 140 on the image side into the subguide holding part 320b of the second fixed lens frame 320. In this state, the second fixed lens frame 320 is fixed to the first fixed lens frame 120 with multiple screws 340. After that, the bearing 400 is assembled into the opening 320a from the cover 330 side so that the projection 400b of the bearing 400 and the notch 320d of the second fixed lens frame 320 are aligned in phase. Through this assembly process, the bearing 400 and the second fixed lens frame 320 can be assembled, and then the tilt of the focus group 200 can be adjusted as described later. Also, when viewed from the direction of the optical axis O10, a part of the bearing 400 is positioned to overlap with the second fixed lens 310, which allows for a smaller lens barrel 10.

[0026] Figure 5 is a plan view showing the positional relationship between the second fixed lens frame and the bearing when viewed from the optical axis direction. Figure 5(a) shows the assembly phase of the bearing 400. Figure 5(b) shows the assembly phase (first position) of the focus group 200 in the bearing 400 when it is not adjusted. Figure 5(c) shows the assembly phase (second position) of the focus group 200 in the bearing 400 when its tilt is adjusted. Figure 6 is a longitudinal cross-sectional view showing the state in which the bearing is incorporated into the second fixed lens frame. Figure 6(a) is a longitudinal cross-sectional view showing the engagement state between the bearing 400 and the second fixed lens frame 320 in the first position shown in Figure 5(b). Figure 6(b) is a longitudinal cross-sectional view showing the engagement state between the bearing 400 and the second fixed lens frame 320 in the second position shown in Figure 5(c). Figure 7 is a plan view of the adjustment of the bearing (tilt adjustment of the focus group) using a jig, as viewed from the image side. Figure 8 is a perspective view from the image side showing the adjustment of the bearings using a jig (adjustment of the tilt of the focus group).

[0027] In the state shown in Figure 5(a), the bearing 400 is inserted into the opening 320a of the second fixed lens frame 320. As a result, the abutment surface 320c of the second fixed lens frame 320 and the abutment surface 400e of the bearing 400 come into contact with each other. As the bearing 400 is inserted into the opening 320a of the second fixed lens frame 320, the other end of the main guide bar 130 on the image side is inserted into the holding portion 400c of the bearing 400. The bearing 400 is held in the second fixed lens frame 320 so as to be rotatable in both the direction of arrow α and the direction of arrow β.

[0028] By rotating the bearing 400 in the direction of arrow α from the assembled phase state shown in Figure 5(a), the state shown in Figures 5(b) and 6(a) is achieved. In the state shown in Figures 5(b) and 6(a), the bearing 400 rotates to the first position relative to the second fixed lens frame 320. When the bearing 400 is in the first position, the mating surface 400d of the bearing 400 fits with the mating surface 320e of the second fixed lens frame 320. Also, the restricting surface 400h of the bearing 400 contacts the restricting surface 320i of the second fixed lens frame 320. This restricts the movement of the bearing 400 in the orthogonal direction. Furthermore, the adhesive groove 400f of the bearing 400 and the first adhesive portion 320f of the second fixed lens frame 320 are in phase, enabling adhesion between the bearing 400 and the second fixed lens frame 320. In this state, by applying a predetermined adhesive to the adhesive groove 400f and the vicinity of the first adhesive portion 320f, the bearing 400 can be fixed to the second fixed lens frame 320.

[0029] On the other hand, by rotating the bearing 400 in the direction of arrow β from the state shown in Figure 5(a), the state shown in Figures 5(c) and 6(b) is achieved. In the state shown in Figures 5(c) and 6(b), the bearing 400 moves to the second position relative to the second fixed lens frame 320. When the bearing 400 is in the second position, the mating surface 400d of the bearing 400 faces the inner wall 320h of the second fixed lens frame 320. Also, the adhesive groove 400f of the bearing 400 and the second adhesive portion 320g of the second fixed lens frame 320 are in the same phase, enabling adhesion between the bearing 400 and the second fixed lens frame 320. In this state, by applying a predetermined adhesive to the vicinity of the adhesive groove 400f and the second adhesive portion 320g, the bearing 400 can be fixed to the second fixed lens frame 320. Furthermore, when the bearing 400 is in the second position, the abutment surface 400e of the bearing 400 abuts against the abutment surface 320c of the second fixed lens frame 320. In the second fixed lens frame 320, since the diameter of the inner wall 320h is larger than the diameter of the fitting surface 320e, a gap 50 is formed between the fitting surface 400d and the inner wall 320h (see Figure 5(c)). And, at the position opposite to the regulating surface 320i of the second fixed lens frame 320, the regulating surface 400h of the bearing 400 does not exist. 400h regulation A gap 60 is formed on the image side (Figure 6) (b)(See reference). In this state, with the bearing 400 held in the second position by the second fixed lens frame 320, only the abutment surface 400e of the bearing 400 contacts the abutment surface 320c of the second fixed lens frame 320, allowing it to move in the orthogonal direction. Then, in this state, when the bearing 400 is moved to any position in the orthogonal direction using the jig 20 (see Figures 7 and 8), the main guide bar 130 held by the bearing 400 tilts. This allows the focus group 200 to be tilted, and thus the tilt of the focus group 200 can be adjusted.

[0030] Furthermore, when the bearing 400 is rotated in the direction of arrow α, the bearing 400 becomes fixed to the second fixed lens frame 320. In this state, the tilt of the focus group 200 is inspected. If the inspection results confirm that the tilt of the focus group 200 satisfies the predetermined standard, the predetermined adhesive is applied to the adhesive groove 400f and the first adhesive part 320f. This allows the bearing 400 to be fixed without adjusting the tilt of the focus group 200.

[0031] On the other hand, if the tilt inspection of the focus group 200 reveals that the tilt of the focus group 200 does not meet the specified standard, the bearing 400 is rotated in the direction of arrow β to move the bearing 400 to the second position, and the tilt is adjusted using the jig 20. After that, the specified adhesive is applied to the adhesive groove 400f and the second adhesive part 320g, and the bearing 400 is fixed to the second fixed lens frame 320. Thus, the tilt adjustment of the focus group 200 only needs to be performed if the bearing 400 could not be fixed in the first position. This makes it possible to increase the productivity of the lens barrel 10 by omitting the tilt adjustment of the focus group 200 when it is not necessary.

[0032] Furthermore, when the bearing 400 is in the second position, the projection 400b and the notch 320d are positioned so that the abutment surface 320c is not aligned toward the optical axis O10. As a result, as shown in Figure 7, when adjusting the tilt of the focus group 200, the jig 20 does not overlap with the optical axis O10. This makes it possible to easily adjust the tilt.

[0033] Incidentally, in the bearing 400, the diameter of the mating surface 400d is "R_400d", and the diameter of the outer circumference 400i of the main body 400j is "R_400i". Also, in the second fixed lens frame 320, the diameter of the inner wall 320h is "r_320h", and the diameter of the inner outer wall 320j is "r_320j". In this case, the relationship (R_400d-r_320h)<(r_320j-R_400i) is satisfied. As a result, when the bearing 400 is moved in the orthogonal direction, the mating surface 400d of the bearing 400 becomes a restricting surface that restricts the movement of the bearing 400 and comes into contact with the inner wall 320h of the second fixed lens frame 320. In other words, in a state where tilt adjustment is possible, the mating surface 400d and the inner wall 320h are in the closest positional relationship in the orthogonal direction. As mentioned above, an adhesive groove 400f is provided on the image side of the mating surface 400d. In addition, a second adhesive portion 320g is provided in the same phase as the inner circumferential wall 320j. Therefore, when the bearing 400 is rotated in the direction of arrow β to adjust its tilt, the adhesive groove 400f and the second adhesive portion 320g are in the closest proximity, allowing for efficient application of adhesive.

[0034] Next, the positioning section 30 for positioning the second fixed lens 310 will be described. As mentioned above, the second fixed lens 310 is provided protruding from the flange section 310j and has three protrusions 310b that constitute the positioning section 30 (see Figure 2). The three protrusions 310b are arranged at equal intervals along the circumferential direction of the flange section 310j, that is, at equal angular intervals around the optical axis O10. Each protrusion 310b has a size that can be formed on the flange section 310j, and its outer diameter is a constant cylindrical shape along the direction of the optical axis O10. In addition, the outer diameter of each protrusion 310b is small compared to the outer diameter of the second fixed lens 310. This makes it possible to form each protrusion 310b with high dimensional accuracy.

[0035] Figure 9 is a perspective view of the cover of the lens barrel shown in Figure 1. As shown in Figure 9, the cover 330 has three recesses 330c provided on the same side as the arm portion 330a and the fitting portion 330g. In the configuration shown in Figure 9, the three recesses 330c are arranged at equal intervals along the circumferential direction of the three recesses 330c, that is, at equal angular intervals around the optical axis O10. In this embodiment, each recess 330c is composed of a groove extending radially (radially) along the radial direction centered on the optical axis O10. Each of these recesses 330c constitutes a positioning portion 30, similar to each convex portion 310b of the second fixed lens 310. The number of recesses 330c is the same as the number of convex portions 310b. One recess 330c is provided opening toward one convex portion 310b, into which the convex portion 310b is inserted. Furthermore, the number of recesses 330c is not limited to three, as long as it is the same number as the number of protrusions 310b.

[0036] Figure 10 is a longitudinal cross-sectional view taken along the optical axis direction with the convex portion of the second fixed lens inserted into the recess of the cover. Figure 10(a) is a longitudinal cross-sectional view in this embodiment. Figure 10(b) is a longitudinal cross-sectional view of a modified example of this embodiment. As shown in Figure 10(a), the recess 330c has a pair of tapered surfaces 330t whose groove width gradually increases toward the convex portion 310b side. That is, each side surface of the recess 330c is an inclined surface inclined with respect to the optical axis O10 direction. Also, the maximum width W330c of the tapered surface 330t of the recess 330c is larger than the outer diameter (maximum outer diameter) φD310b of the convex portion 310b. As a result, when the convex portion 310b is inserted, the recess 330c contacts the top of the convex portion 310b with its tapered surface 330t. This contact is a point contact.

[0037] Incidentally, the cover 330 has a fitting portion 330g that fits with the outer circumference of the second fixed lens frame 320. This positions the cover 330 perpendicular to the second fixed lens frame 320. The second fixed lens 310 has a flange portion 310j spaced apart from the inner circumferential wall 320j of the second fixed lens frame 320. When the cover 330, the second fixed lens 310, and the second fixed lens frame 320 are assembled, the convex portion 310b is inserted into the concave portion 330c, and the convex portion 310b and the tapered surface 330t of the concave portion 330c make point contact. At this time, the second fixed lens 310 is biased in the direction of the optical axis O10 by the biasing force from each arm portion 330a of the cover 330. Due to the synergistic effect of point contact and biasing, the second fixed lens 310 is positioned (position-controlled) more precisely in the direction of the optical axis O10. As mentioned above, the cover 330 is positioned orthogonally to the second fixed lens frame 320. This positioning also positions the second fixed lens 310 orthogonally.

[0038] As described above, the positioning unit 30 can position the second fixed lens 310 in the direction of the optical axis O10 and position the second fixed lens 310 in the orthogonal direction, at least in the direction of the optical axis O10. As a result, the lens barrel 10 has good optical performance. As previously mentioned, the three protrusions 310b and the three recesses 330c are arranged at equal angular intervals around the optical axis O10. This stabilizes the positioning state of the second fixed lens 310. Although a pair of tapered surfaces 330t are provided, the unit is not limited to this and may have only one.

[0039] The assembly of the cover 330, the second fixed lens 310, and the second fixed lens frame 320 is a simple process involving overlapping these components in the direction of the optical axis O10 and inserting the convex portion 310b into the concave portion 330c. This makes the lens barrel 10 highly easy to assemble. Furthermore, this assembly allows the second fixed lens 310 to be firmly fixed without the use of adhesives or the like. If readjustment of the bearing portion 400 is required later, the second fixed lens 310 can be easily removed, allowing for such readjustment. In addition, even if there are variations in the positional accuracy of, for example, the convex portion 310b or the tapered surface 330t, these variations can be compensated for by the elasticity of the arm portion 330a and the groove shape of the concave portion 330c. As described above, the cover 330 is composed of a cylindrical or ring-shaped component and has an opening 330h on its inside that penetrates in the direction of the optical axis O10 and opens in a circular shape. The aperture 330h allows for limiting the amount of light passing through the second fixed lens 310.

[0040] As shown in Figure 10(b), in the modified configuration, a recess 310c is provided in the second fixed lens 310 as a positioning portion 30, and a protrusion 330b is provided in the cover 330. The recess 310c has a pair of tapered surfaces 310s, and each tapered surface 310s is in contact with the top of the protrusion 330b. As a result, similar to the configuration shown in Figure 10(a), the lens barrel 10 has excellent assembly performance when assembling the cover 330, the second fixed lens 310, and the second fixed lens frame 320, as well as good optical performance.

[0041] <Second Embodiment> The second embodiment will be described below with reference to Figure 11, focusing on the differences from the previously described embodiment, and similar matters will be omitted from the description. Figure 11 is a longitudinal cross-sectional view of the lens barrel according to the second embodiment of the present invention, when the convex portion of the second fixed lens is inserted into the recess of the cover, and the view is cut along the optical axis. Figure 11(a) is a longitudinal cross-sectional view of this embodiment. Figure 11(b) is a longitudinal cross-sectional view of a modified example of this embodiment.

[0042] As shown in Figure 11(a), the positioning portion 30 consists of a convex portion 310f on the second fixed lens 310 and a concave portion 330f on the cover 330. The convex portion 310f has a tapered surface 310g whose outer diameter gradually decreases toward the concave portion 330f. That is, the outer circumferential surface of the convex portion 310f is an inclined surface inclined with respect to the optical axis O10 direction. The concave portion 330f is composed of a groove, and its width W330f is constant along the optical axis O10 direction. The maximum outer diameter φD310f of the tapered surface 310g of the convex portion 310f is greater than the width W330f (the maximum width of the concave portion 330f). As a result, when the convex portion 310f is inserted into the concave portion 330f, the middle of the tapered surface 310g makes point contact with the edge (open portion) 330k of the concave portion 330f.

[0043] As shown in Figure 11(b), in the modified example, the second fixed lens 310 is provided with a recess 310p formed by a groove as the positioning portion 30, and the cover 330 is provided with a protrusion 330p. The protrusion 330p has a tapered surface 330q whose outer diameter gradually decreases toward the recess 310p side. That is, the outer circumferential surface of the protrusion 330p is an inclined surface inclined with respect to the optical axis O10 direction. When the protrusion 330p is inserted into the recess 310p, the middle of the tapered surface 330q makes point contact with the edge 310r of the recess 310p.

[0044] With the positioning section 30 configured as shown in Figures 11(a) and (b), this embodiment, as in the first embodiment, offers excellent assembly capabilities when assembling the cover 330, the second fixed lens 310, and the second fixed lens frame 320, as well as good optical performance.

[0045] As described above, the positioning portion 30 has at least one protrusion provided on either the flange portion 310j of the second fixed lens 310 or the cover 330, and a recess provided on the other of the flange portion 310j or the cover 330. At least one of the protrusion and the recess has an inclined surface, and can contact the other with this inclined surface. Furthermore, the contact on the inclined surface is a point contact, but is not limited to this, and can be a line contact depending on the shape of the protrusion and the recess, for example.

[0046] This embodiment includes the following configurations and methods. (Configuration 1) An optical lens having a lens portion that functions as a lens, and a flange portion provided on the outer circumference of the lens portion and having an enlarged outer diameter, The aforementioned Flange part A holding member that holds the optical axis on one side, The holding member is fixed in a position perpendicular to the optical axis direction, and the holding member is fixed in that position. Flange section in the direction of the optical axis From the dipping side One side fart A pressing member that applies biasing force to hold down. and Prepare, Each of the holding member and the pressing member is provided with an opening that allows light passing through the lens portion to pass through. before Of the flange portion and the retaining member 、 On the one hand teeth The above-mentioned optical axis direction is provided Ta-convex Department A , others to teeth The recess into which the aforementioned protrusion is inserted. A , At least one of the convex portion and the concave portion Included Inclined surface with respect to the optical axis but Contacting the other party Then, the optical lens is positioned relative to the retaining member. A lens barrel characterized by the following features. (Configuration 2) Positioning of the optical lens relative to the pressing member This refers to the positioning of the optical lens in the optical axis direction and the positioning of the optical lens in the orthogonal direction, at least the positioning in the optical axis direction. That is A lens barrel according to configuration 1, characterized by the above. (Configuration 3) The lens barrel according to Configuration 1 or 2, characterized in that the contact on the inclined surface is point contact or line contact. (Configuration 4) The lens barrel according to any one of Configurations 1 to 3, characterized in that the recess is composed of a groove extending along the radial direction centered on the optical axis. (Configuration 5) The lens barrel according to Configuration 4, characterized in that the recess has a tapered surface in which the width of the groove gradually increases toward the protruding portion, and the tapered surface of the recess serves as the inclined surface. (Configuration 6) The convex portion is cylindrical in shape, The lens barrel according to configuration 5, characterized in that the maximum width of the tapered surface of the recess is greater than the maximum outer diameter of the protrusion. (Configuration 7) The lens barrel according to any one of Configurations 1 to 6, characterized in that the convex portion is cylindrical. (Configuration 8) The lens barrel according to Configuration 7, characterized in that the convex portion has a tapered surface whose outer diameter gradually decreases toward the concave side, and the tapered surface of the convex portion serves as the inclined surface. (Configuration 9) The recess is composed of a groove extending along the radial direction centered on the optical axis, The lens barrel according to configuration 8, characterized in that the maximum outer diameter of the tapered surface of the protrusion is greater than the maximum width of the groove. (Configuration 10) A lens barrel according to any one of Configurations 1 to 9, characterized in that three or more of the convex portions and concave portions are each arranged. (Configuration 11) The lens barrel according to Configuration 10, characterized in that the three or more protrusions and the three or more recesses are each arranged at equal angular intervals around the optical axis. (Composition 12) before Flange section In the orthogonal direction, Separated from the aforementioned holding member attitude A lens barrel according to any one of configurations 1 to 11, characterized by the following: (Configuration 13) An imaging device characterized by comprising the lens barrel described in Configuration 1. (Method 1) An optical lens having a lens portion that functions as a lens, and a flange portion provided on the outer circumference of the lens portion and having an enlarged outer diameter, The aforementioned Flange part A holding member that holds the optical axis on one side, The holding member is fixed in a position perpendicular to the optical axis direction, and the holding member is fixed in that position. Flange sectionin the direction of the optical axis From the dipping side One side fart A pressing member that applies biasing force to hold down. and A method for positioning the optical lens in a lens barrel, Each of the holding member and the pressing member is provided with an opening that allows light passing through the lens portion to pass through. before Of the flange portion and the retaining member 、 On one side, it is provided protruding in the direction of the optical axis. Ta-convex Department Provide , others The recess into which the aforementioned protrusion is inserted Provide , At least one of the convex portion and the concave portion Included Inclined surface with respect to the optical axis but To bring into contact with the other side Then, the optical lens is positioned relative to the retaining member. A method for positioning an optical lens, characterized by the following features.

[0047] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications and changes are possible within the scope of its gist. [Explanation of Symbols]

[0048] 10 Lens barrel 30 Positioning section 310 Second fixed lens (optical lens) 310b Convex part (protrusion) 310j flange section 320 Second fixed lens frame (holding member) 330 Cover (Retaining Member) 330c recess 330t tapered surface O10 optical axis

Claims

1. An optical lens having a lens portion that functions as a lens, and a flange portion provided on the outer circumference of the lens portion and having an enlarged outer diameter, A holding member that holds the flange portion on one side in the optical axis direction, The holding member fixes the flange portion in a position perpendicular to the optical axis direction, and the holding member biases and presses the flange portion from the other side in the optical axis direction toward the one side relative to the holding member. Each of the holding member and the pressing member is provided with an opening that allows light passing through the lens portion to pass through. Of the flange portion and the retaining member, one is provided with a protrusion that protrudes in the direction of the optical axis, and the other is provided with a recess into which the protrusion is inserted. A lens barrel characterized in that the optical lens is positioned relative to the retaining member by an inclined surface, which is located in at least one of the convex portion and the concave portion and is inclined with respect to the optical axis direction, contacting the other portion.

2. The lens barrel according to Claim 1, characterized in that the positioning of the optical lens with respect to the retaining member is at least the positioning in the optical axis direction, of the positioning of the optical lens in the optical axis direction and the positioning of the optical lens in the orthogonal direction.

3. The lens barrel according to claim 1, characterized in that the contact on the inclined surface is point contact or line contact.

4. The lens barrel according to claim 1, characterized in that the recess is composed of a groove extending along the radial direction centered on the optical axis.

5. The lens barrel according to claim 4, characterized in that the recess has a tapered surface in which the width of the groove gradually increases toward the convex side, and the tapered surface of the recess serves as the inclined surface.

6. The aforementioned protrusion is cylindrical in shape. The lens barrel according to claim 5, characterized in that the maximum width of the tapered surface of the recess is greater than the maximum outer diameter of the protrusion.

7. The lens barrel according to claim 1, characterized in that the convex portion is cylindrical.

8. The lens barrel according to claim 7, characterized in that the convex portion has a tapered surface whose outer diameter gradually decreases toward the concave side, and the tapered surface of the convex portion serves as the inclined surface.

9. The recess is composed of a groove extending along the radial direction centered on the optical axis, The lens barrel according to claim 8, characterized in that the maximum outer diameter of the tapered surface of the protrusion is greater than the maximum width of the groove.

10. The lens barrel according to claim 1, characterized in that three or more of the convex portions and concave portions are arranged therein.

11. The lens barrel according to claim 10, characterized in that the three or more protrusions and the three or more recesses are each arranged at equal angular intervals around the optical axis.

12. The lens barrel according to claim 1, characterized in that the flange portion is spaced apart from the retaining member in the orthogonal direction.

13. An imaging device characterized by comprising the lens barrel described in claim 1.

14. An optical lens having a lens portion that functions as a lens, and a flange portion provided on the outer circumference of the lens portion and having an enlarged outer diameter, A holding member that holds the flange portion on one side in the optical axis direction, A method for positioning an optical lens in a lens barrel comprising a retaining member that fixes the lens in a position perpendicular to the optical axis direction, and a pressing member that biases and presses the flange portion of the lens from the other side in the optical axis direction to the one side relative to the retaining member, Each of the holding member and the pressing member is provided with an opening that allows light passing through the lens portion to pass through. Of the flange portion and the retaining member, one is provided with a protrusion that protrudes in the optical axis direction, and the other is provided with a recess into which the protrusion is inserted. A method for positioning an optical lens, characterized in that an inclined surface, which is inclined with respect to the optical axis direction and is included in at least one of the convex portion and the concave portion, is brought into contact with the other, thereby positioning the optical lens with respect to the retaining member.

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