Lens barrel and imaging device

Abstract

To provide a lens barrel that achieves both impact resistance and assembly workability.SOLUTION: A lens barrel has: a positioning member that is fixed to a holding member holding an optical member to adjust a position of the holding member with respect to a base member; and an impact resistance member that is fixed to the holding member. The base member is formed with a first hole for incorporating the impact resistance member. A fitting part provided on the impact resistance member and fitting to the holding member and a fitting part provided on the holding member and fitting to the impact resistance member have a polygonal shape. The first hole is formed of a first surface parallel to an optical axis, and a second surface parallel to a surface orthogonal to the optical axis. A contour of the impact resistance member is formed of a third surface parallel to the optical axis and facing the first surface, and a fourth surface parallel to the surface orthogonal to the optical axis and facing the second surface. At least one of a first gap formed between the first surface and the third surface and a second gap formed between the second surface and the fourth surface is filled with an adhesive.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Lens barrels are required to suppress misalignment of optical members due to impacts or environmental fluctuations. Patent Document 1 discloses an optical device equipped with a means for fixing an optically adjusted lens holding member to a base member. Specifically, a convex portion provided on the lens holding member is positioned inside a through-hole portion provided in the base member, and with a sealing member incorporated in the through-hole portion, an adhesive is filled around the convex portion, thereby fixing the lens holding member to the base member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-194104 Summary of the Invention [Problem to be solved by the invention]

[0004] In the optical device of Patent Document 1, the area filled with adhesive is cylindrical, with the convex portion at its center, and the contact area between the adhesive and the convex portion is small upon impact. Therefore, if the optical element is heavy, the adhesive will be crushed upon impact, causing the lens holding element to shift position and resulting in reduced product performance. Furthermore, because the sealing element is not fixed to the lens holding element until the adhesive hardens, the adhesive work must be performed one location at a time, reducing assembly workability.

[0005] An object of the present invention is to provide a lens barrel that is both shock-resistant and easy to assemble. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a lens barrel having a base member, a holding member that holds an optical member, a positioning member that is fixed to the holding member and that adjusts the position of the holding member relative to the base member, and an impact-resistant member that is fixed to the holding member, wherein the base member is formed with a first hole for incorporating the impact-resistant member, and a fitting portion that is provided on the impact-resistant member and that fits with the holding member and the fitting portion that is provided on the holding member and that fits with the impact-resistant member are polygonal in shape, and the first hole is formed with a first hole for fitting the optical member, The optical element is formed of a first surface parallel to the optical axis and a second surface parallel to a plane perpendicular to the optical axis, the outer shape of the impact-resistant element is formed of a third surface parallel to the optical axis and facing the first surface, and a fourth surface parallel to a plane perpendicular to the optical axis and facing the second surface, a first gap is formed between the first surface and the third surface, a second gap is formed between the second surface and the fourth surface, and at least one of the first gap and the second gap is filled with an adhesive. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a lens barrel that is both impact-resistant and easy to assemble. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a camera system according to a first embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the lens unit of the first embodiment. [Figure 3] FIG. 2 is an explanatory diagram of an impact-resistant piece according to the first embodiment. [Figure 4] FIG. 2 is a side view of the lens unit of the first embodiment. [Figure 5] FIG. 2 is a partial enlarged view of the lens unit of the first embodiment. [Figure 6] 6 is a cross-sectional view of the lens unit of the first embodiment taken along line AA in FIG. 5. [Figure 7] FIG. 6 is a cross-sectional view of the lens unit of the first embodiment taken along line BB in FIG. 5. [Figure 8] FIG. 10 is a partial enlarged view of the lens unit of the second embodiment. [Figure 9]FIG. 9 is a cross-sectional view of the lens unit of Example 2 taken along line CC in FIG. 8. [Figure 10] FIG. 9 is a cross-sectional view of the lens unit of Example 2 taken along line DD in FIG. 8. [Figure 11] FIG. 10 is a partial enlarged view of the lens unit of the third embodiment. [Figure 12] FIG. 12 is a cross-sectional view of the lens unit of Example 3 taken along line EE in FIG. [Figure 13] FIG. 12 is a cross-sectional view of the lens unit of Example 3 taken along line FF in FIG. [Figure 14] FIG. 10 is a partially enlarged view of the lens unit of the fourth embodiment. [Figure 15] FIG. 15 is a cross-sectional view of the lens unit of Example 4 taken along line GG in FIG. [Figure 16] FIG. 15 is a cross-sectional view of the lens unit of Example 4 taken along line HH in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same components, and redundant explanations will be omitted. [Example]

[0010] FIG. 1 is a perspective view of a camera system of this embodiment. The camera system includes a lens barrel 100 and a camera (imaging device) 200. The lens barrel 100 is configured to be detachable from the camera 200 via a mount (not shown). The lens barrel 100 also includes a lens unit 101. The lens barrel 100 also includes a control unit, lens drive instruction means, and a contact unit capable of communicating with the camera 200 (all not shown). The camera 200 also includes a control unit, an imaging element, and a contact unit capable of communicating with the lens barrel 100 (all not shown). The imaging element included in the camera 200 receives light from the lens barrel 100. The camera 200 may also be configured integrally with the lens barrel 100.

[0011] FIG. 2 is an exploded perspective view of a lens unit 101 according to this embodiment. The lens unit 101 includes a lens (optical member) 102, a lens holding barrel (holding member) 103, a base 104, rollers (positioning members) 105, screws 106, shock-resistant pieces (shock-resistant members) 107, and screws 108. The lens holding barrel 103 holds the lens 102. The base 104 holds the lens holding barrel 103. The rollers 105 are fixed to the lens holding barrel 105 and adjust the position of the lens holding barrel 103 relative to the base 104. The screws 106 fix the rollers 105 to the lens holding barrel 103. The shock-resistant pieces 107 absorb shocks over a wide area. The screws 108 fix the shock-resistant pieces 107 to the lens holding barrel 103. Because the shock-resistant pieces 107 are fixed with the screws 108, the bonding process is not limited to one location at a time, improving workability.

[0012] A lens holding portion 103a, a roller fitting portion 103b, and an impact-resistant piece fitting portion (fitting portion) 103c are provided on the outer periphery of the lens holding barrel 103. The shape of the impact-resistant piece fitting portion 103c is a rectangle formed by a surface 103d parallel to the optical axis 300 of the lens 102 and a surface 103e parallel to a plane perpendicular to the optical axis 300. The shape of the impact-resistant piece fitting portion 103 is not limited to a rectangle, and may be any polygonal shape that allows for rotation restriction.

[0013] The outer periphery of the base 104 is provided with a roller assembly hole (second hole) 104a and an impact-resistant piece assembly hole (first hole) 104b. The impact-resistant piece assembly hole 104b is formed by a surface (first surface) 104c parallel to the optical axis 300 and a surface (second surface) 104d parallel to a plane perpendicular to the optical axis 300. A notch (third notch) 104e is formed in a portion of the surface 104d. The notch 104e includes a surface 104f parallel to the optical axis 300 and a surface 104g parallel to the plane perpendicular to the optical axis 300. Because the length of the surface 104f is longer than the thickness of the side surface 104h, when an impact is applied after the adhesive application process to the notch 104e, the side surface 104h elastically deforms before the adhesive is completely crushed.

[0014] After the lens holding barrel 103 is mounted on the inner periphery of the base 104, the rollers 105 are mounted from the outer periphery of the base 104 and fixed to the lens holding barrel 103 with screws 106. At this time, the outer periphery of the rollers 105 and the roller mounting holes 104a are fitted or press-fitted, thereby regulating the position of the lens holding barrel 103. In this embodiment, a press-fit setting is preferable. To position the lens holding barrel 103, the outer portion of the rollers 105 that come into contact with the roller mounting holes 104a may be coaxial with the fitting portion or may be eccentric. Therefore, the lens holding barrel 103 may be a fixed group whose position is not adjustable, or it may be a position-adjustable group whose position is adjusted by the rotation of the rollers 105.

[0015] FIG. 3 is an explanatory diagram of the shock-resistant piece 107. FIGS. 3(a) to 3(c) are a perspective view, a front view, and a rear view, respectively, of the shock-resistant piece 107. The shock-resistant piece 107 has a lens holding barrel fitting portion 107a for restricting rotation when assembled into the lens holding barrel 103. The shape of the lens holding barrel fitting portion 107a is a rectangle formed by a surface 107b parallel to the optical axis 300 and a surface 107c parallel to a plane perpendicular to the optical axis 300. The shape of the lens holding barrel fitting portion 107a is not limited to a rectangle, and may be any polygonal shape that allows for rotation restriction. Furthermore, the outer shape of shock-resistant piece 107, when incorporated into lens holding barrel 103, is formed of outer portion (third surface) 107d that is parallel to optical axis 300 and faces surface 104c, and outer portion (fourth surface) 107e that is parallel to a plane perpendicular to optical axis 300 and faces surface 104d. Shock-resistant piece 107 also has hole 107f through which screw 108 is inserted and notch portion (fourth notch portion) 107g formed by cutting out a part of outer portion 107e. When incorporated into lens holding barrel 103, notch portion 107g includes surface 107h that is parallel to optical axis 300 and surface 107i that is parallel to the plane perpendicular to optical axis 300.

[0016] Fig. 4 is a side view of lens unit 101 of this embodiment. Fig. 5 is a partially enlarged view of lens unit 101 of this embodiment. Fig. 6 is a cross-sectional view of lens unit 101 of this embodiment taken along line AA in Fig. 5. Fig. 7 is a cross-sectional view of lens unit 101 of this embodiment taken along line BB in Fig. 5. The configuration of this embodiment is preferably used for a fixed group or an eccentricity adjustment group.

[0017] Lens holding barrel 103 is positioned in a direction parallel to optical axis 300 and a direction perpendicular to optical axis 300 by press-fitting three rollers 105, which are fixed with screws 106, into base 104 at equal intervals of 120°. The number of rollers 105 is preferably at least three. Lens holding barrel 103 also includes six shock-resistant pieces 107, which are fixed with screws 108. The number of shock-resistant pieces 107 is preferably at least three.

[0018] As described above, the shock-resistant piece fitting portion 103c and the lens holding barrel fitting portion 107a are rectangular, which restricts rotation about the screw 108 when the shock-resistant piece 107 is fixed with the screw 108. As a result, the surface 104c of the shock-resistant piece assembly hole 104a faces the outer portion 107d of the shock-resistant piece 107, forming a gap (first gap) 400. Because the surface 104c and the outer portion 107d are parallel to the optical axis 300, the contact area in the direction perpendicular to the optical axis 300 can be increased in the event of a shock, thereby improving shock resistance. Furthermore, the surface 104d of the shock-resistant piece assembly hole 104a faces the outer portion 107e of the shock-resistant piece 107, forming a gap (second gap) 401. Since surface 104d and outer portion 107e are perpendicular to the optical axis, the contact area in the direction parallel to optical axis 300 can be increased in the event of an impact, thereby improving impact resistance. At least one of gaps 400, 401 is filled with adhesive.

[0019] When the lens holding barrel 103 is an eccentricity adjustment group, the gap 400 does not change and the gap 401 is wide enough for the eccentricity adjustment, allowing for eccentricity adjustment without increasing resistance in the direction parallel to the optical axis 300 or the direction perpendicular to the optical axis 300. Furthermore, the cutouts 104e and 107g face each other to form an adhesive groove 402. By filling the gaps 400 and 401 and the adhesive groove 402 with an adhesive and allowing it to harden, it is possible to eliminate the gap between the shock-resistant assembly hole 104b and the shock-resistant piece 107 and improve shock resistance. The adhesive groove 402 can widen the adhesive bonding area, thereby improving shock resistance, particularly in the direction parallel to the optical axis 300.

[0020] If the lens holding barrel 103 is a fixed group whose position is not adjusted, it is preferable to provide cutouts in the surface 104c and the outer portion 107d. Also, if the lens holding barrel 103 is a tilt-adjustable group, it is preferable to configure the shock-resistant piece 107 so that it can be assembled by rotating it 90° when viewed from the assembly direction, and to form the cutout 104e in the surface 104c. Also, the adhesive groove 402 may be formed in multiple places rather than just one place.

[0021] One possible solution to shock resistance would be to make the positioning rollers rectangular in shape, but if the lens holding barrel 103 is a position adjustment group, it would be necessary to rotate the positioning rollers, which have eccentric shapes. This means that the screws that secure the rollers must be loosened each time the position is adjusted, which reduces workability. In this embodiment, shock-resistant blocks 107 are provided that are secured by screws 108, separate from the rollers 105, making it possible to provide a lens barrel that combines shock resistance with ease of assembly. [Example]

[0022] The lens barrel of this embodiment differs from the lens barrel of embodiment 1 in the configuration of the lens unit 101. In this embodiment, a description of the configuration that is the same as in embodiment 1 will be omitted, and only the different configuration will be described.

[0023] Fig. 8 is a partially enlarged view of a lens unit 101 of this embodiment. Fig. 9 is a cross-sectional view of the lens unit of this embodiment taken along line CC in Fig. 8. Fig. 10 is a cross-sectional view of the lens unit of this embodiment taken along line DD in Fig. 8. The configuration of this embodiment is preferably used for a fixed group or an eccentricity adjustment group.

[0024] In this embodiment, a notch portion (first notch portion) 104i is formed in a portion of the surface 104c. The notch portion 104i includes a surface 104j parallel to the optical axis 300 and a surface 104k parallel to a plane perpendicular to the optical axis 300. The outer portion 107d also includes an arm portion (first arm portion) 107j extending in the radial direction of the shock resistant piece 107 (a direction parallel to the optical axis 300 and a direction perpendicular to the assembly direction of the shock resistant piece 107). Gaps 403 and 404 are formed between the notch portion 104i and the arm portion 107j. As shown in FIG. 9, in a plane perpendicular to the optical axis 300 (as viewed from a direction parallel to the optical axis 300), the notch portion 104i and the arm portion 107j overlap in the radial direction of the shock resistant piece 107. When the lens holding barrel 103 is an eccentricity adjustment group, the notch 104i and the arm 107j always overlap in the radial direction of the shock-resistant piece 107 on a plane perpendicular to the optical axis 300, even at maximum eccentricity adjustment. Therefore, the creepage distance can be increased more than in the first embodiment, and the adhesive can be prevented from wrapping around the inner diameter, improving workability. Furthermore, the contact area of ​​the adhesive can be increased more than in the first embodiment, improving shock resistance.

[0025] When the lens holding barrel 103 is a tilt-adjustable group, it is preferable that the shock-resistant top 107 be configured so that it can be assembled by rotating it 90° as seen from the assembly direction, and that a notch 104e be formed in the surface 104c. [Example]

[0026] The lens barrel of this embodiment differs from the lens barrels of Embodiments 1 and 2 in the configuration of the lens unit 101. In this embodiment, a description of the configuration that is the same as in Embodiments 1 and 2 will be omitted, and only the different configuration will be described.

[0027] Fig. 11 is a partially enlarged view of a lens unit 101 of this embodiment. Fig. 12 is a cross-sectional view of the lens unit of this embodiment taken along line EE in Fig. 11. Fig. 13 is a cross-sectional view of the lens unit of this embodiment taken along line FF in Fig. 11. The configuration of this embodiment is preferably used for a fixed group or a tilt-down adjustment group.

[0028] In this embodiment, a cutout portion (second cutout portion) 107k is formed in a part of the outer portion 107d. The cutout portion 107k includes a surface 107l parallel to the optical axis 300 and a surface 107m parallel to a plane perpendicular to the optical axis 300. The outer portion 107e also has an arm portion (second arm portion) 107n extending in a direction parallel to the optical axis 300. Gaps 405 and 406 are formed between the cutout portion 104e and the arm portion 107n. As shown in FIG. 13 , on the plane parallel to the optical axis 300 (as viewed from a direction parallel to the optical axis 300 and a direction perpendicular to the assembly direction of the shock-resistant piece 107), the cutout portion 104e and the arm portion 107n overlap in the radial direction of the shock-resistant piece 107. When the lens holding barrel 103 is a tilt-adjustable group, the notch 104e and the arm 107n always overlap in the radial direction of the shock-resistant piece 107 on a plane parallel to the optical axis 300, even at maximum tilt adjustment. This increases the creepage distance and prevents the adhesive from wrapping around the inner diameter, improving workability. Furthermore, increasing the contact area of ​​the adhesive also improves shock resistance. [Example]

[0029] The lens barrel of this embodiment differs from the lens barrels of Embodiments 1 to 3 in the configuration of the lens unit 101. In this embodiment, a description of the configuration that is the same as in Embodiments 1 to 3 will be omitted, and only the different configuration will be described.

[0030] Fig. 14 is a partially enlarged view of a lens unit 101 of this embodiment. Fig. 15 is a cross-sectional view of the lens unit of this embodiment taken along line GG in Fig. 14. Fig. 16 is a cross-sectional view of the lens unit of this embodiment taken along line HH in Fig. 14. The configuration of this embodiment is preferably used for the tilt adjustment group and the decentering adjustment group.

[0031] In this embodiment, the outer portion 107d includes an arm 107j. Gaps 403, 404 are formed between the cutout 104e and the arm 107j. As shown in FIG. 15 , in a plane perpendicular to the optical axis 300, the cutout 104i and the arm 107j overlap in the radial direction of the shock-resistant piece 107. When the lens holding barrel 103 is an eccentricity adjustment group, in a plane perpendicular to the optical axis 300, the cutout 104i and the arm 107n always overlap in the radial direction of the shock-resistant piece 107, even at the time of maximum eccentricity adjustment.

[0032] Further, the outer portion 107e includes an arm 107n. Gaps 405, 406 are formed between the notch 104e and the arm 107n. As shown in Fig. 15, in a plane parallel to the optical axis 300, the notch 104e and the arm 107n overlap in the radial direction of the shock-resistant piece 107. When the lens holding barrel 103 is a tilt adjustment group, in a plane parallel to the optical axis 300, the notch 104e and the arm 107n always overlap in the radial direction of the shock-resistant piece 107 even at the time of maximum eccentricity adjustment.

[0033] The above configuration increases the creepage distance and prevents the adhesive from wrapping around the inner diameter, improving workability. In addition, the contact area of ​​the adhesive can be increased, improving impact resistance.

[0034] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0035] 100 Lens barrel 102 Lens (optical component) 103 Lens holding tube (holding member) 103c Impact-resistant link fitting (fitting) 104 Base 104b Shock-resistant piece mounting hole (first hole) 104c face (first face) 104d face (second face) 105 Roller (positioning member) 107 Impact-resistant piece (impact-resistant member) 107a Lens holding barrel fitting portion (fitting portion) 107d (third face) 107e (4th side) 300 optical axis 400 gap (first gap) 401 Gap (Second Gap)

Claims

1. A base member; a holding member for holding an optical member; a positioning member fixed to the holding member for adjusting the position of the holding member relative to the base member; an impact resistant member fixed to the holding member, a first hole for incorporating the impact resistant member is formed in the base member; a fitting portion provided on the impact resistant member to be fitted with the holding member and a fitting portion provided on the holding member to be fitted with the impact resistant member each have a polygonal shape; the first hole is formed by a first surface parallel to an optical axis of the optical member and a second surface parallel to a plane perpendicular to the optical axis, an outer shape of the impact-resistant member is formed by a third surface that is parallel to the optical axis and faces the first surface, and a fourth surface that is parallel to a plane perpendicular to the optical axis and faces the second surface; a first gap is formed between the first surface and the third surface; a second gap is formed between the second surface and the fourth surface; The lens barrel according to claim 1, wherein at least one of the first gap and the second gap is filled with an adhesive.

2. 2. The lens barrel according to claim 1, wherein the base member has a second hole formed therein for inserting the positioning member therein.

3. a first cutout portion including a surface parallel to the optical axis and a surface parallel to a plane perpendicular to the optical axis is formed in the first surface; a second cutout portion including a surface parallel to the optical axis and a surface parallel to a plane perpendicular to the optical axis is formed in the third surface; 3. The lens barrel according to claim 1, wherein the first cutout portion and the second cutout portion face each other to form an adhesive groove.

4. a first cutout portion including a surface parallel to the optical axis and a surface parallel to a plane perpendicular to the optical axis is formed in the first surface; the third surface includes a first arm portion extending in a radial direction of the impact-resistant member; 3. The lens barrel according to claim 1, wherein the first arm and the first cutout overlap in the radial direction when viewed in a direction parallel to the optical axis.

5. a third cutout portion including a surface parallel to the optical axis and a surface parallel to a plane perpendicular to the optical axis is formed in the second surface; a fourth cutout portion including a surface parallel to the optical axis and a surface parallel to a plane perpendicular to the optical axis is formed in the fourth surface; 5. The lens barrel according to claim 1, wherein the third cutout portion and the fourth cutout portion face each other to form an adhesive groove.

6. a third cutout portion including a surface parallel to the optical axis and a surface parallel to a plane perpendicular to the optical axis is formed in the second surface; the fourth surface includes a second arm portion extending in a direction parallel to the optical axis, 5. The lens barrel according to claim 1, wherein the second arm portion and the third cutout portion overlap in the radial direction of the impact-resistant member when viewed in a direction parallel to the optical axis and a direction perpendicular to the direction in which the impact-resistant member is assembled into the holding member.

7. 7. The lens barrel according to claim 1, wherein the holding member is an eccentricity adjustment group.

8. 8. The lens barrel according to claim 1, wherein the holding member is a tilt adjustment group.

9. The lens barrel according to any one of claims 1 to 8, and an image sensor that receives light from the lens barrel.

Images