Lens device and imaging device

Abstract

To provide a lens device and an imaging device that can be miniaturized. [Solution] The lens device 100 includes a first lens frame 10 that holds the first lenses 1A and 1B, a retaining frame 30 that holds the first lens frame 10, an adjustment mechanism 40 that can adjust the positional relationship between the retaining frame 30 and the first lens frame 10, and a second lens frame 20 that holds the second lenses 2A to 2D. The groove engagement portions 37a to 37c of the retaining frame 30 and the claw engagement portions 21a to 21c of the second lens frame 20 engage with each other.

Description

Technical Field

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

Background Art

[0002] In Patent Document 1, the front group lens barrel constitutes a first lens holding member that holds a front lens group, the middle barrel and the rear group lens barrel constitute a second lens holding member, the rear group lens barrel holds a rear lens group, the front group lens barrel and the middle barrel are connected by fitting an engaging claw of the front group lens barrel into an engaging hole of the middle barrel, the middle barrel and the rear group lens barrel are connected by engaging a bayonet groove of the middle barrel with a bayonet claw of the rear group lens barrel, the aperture unit and the middle barrel are connected by fitting an engaging claw of the middle barrel into the front disk surface of the aperture unit, the straight movement key portion of the middle barrel is fitted into a groove of a fixed barrel, and a cam follower portion of a focus adjustment member is fitted into a cam groove space formed by a cam surface of the front group lens barrel and a cam surface of the middle barrel. As the focus adjustment member rotates, the front group lens barrel, the middle barrel, and the rear group lens barrel move integrally in the optical axis direction. A lens barrel is described.

[0003] In Patent Document 2, it is a single-focus lens, and inside a rotating barrel arranged inside a fixed barrel, a front lens group, shutter blades, and a rear lens group are arranged. The aperture of the rear lens group is larger than the aperture of the front lens group. An engaging portion for bayonet connection is formed between the rear end side of the inner peripheral surface of the moving barrel and a lens holding frame that holds the rear lens group, and a rear lens unit is fixed inside the moving barrel. A lens barrel is described.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

[0005] One embodiment of the technology described herein provides a lens device and an imaging device that can be miniaturized. [Means for solving the problem]

[0006] (1) A first lens frame that holds the first lens, A retaining frame that holds the first lens frame, An adjustment mechanism that allows adjustment of the positional relationship between the above-mentioned retaining frame and the above-mentioned first lens frame, A second lens frame that holds the second lens is provided, The first engaging portion of the retaining frame and the second engaging portion of the second lens frame engage with each other. Lens device.

[0007] (2) (1) The lens device described above, The above adjustment mechanism is, A first adjustment mechanism capable of adjusting the tilt of the first lens frame relative to the above-mentioned retaining frame, A second adjustment mechanism that can adjust the position of the first lens frame relative to the above-mentioned retaining frame, including, Lens device.

[0008] (3) (2) The lens device described above, The above-mentioned retaining frame has a plurality of the above-mentioned first engaging portions, The second lens frame has multiple of the above-mentioned second engaging portions. Lens device.

[0009] (4) (3) Lens device as described above, The first adjustment mechanism, the second adjustment mechanism, and the first engagement portion are arranged along the optical axis. Lens device.

[0010] (5) (4) Lens device as described above, The first adjustment mechanism, the second adjustment mechanism, and the first engaging portion are arranged along different positions around the optical axis. Lens device.

[0011] (6) The lens device according to any one of (1) to (5), The first engaging portion and the second engaging portion engage in a bayonet type or a snap fit type. Lens device.

[0012] (7) The lens device according to (6), The first engaging portion of the holding frame and the second engaging portion of the second lens frame engage in the bayonet type, At least one of the first engaging portion of the holding frame and the second engaging portion of the second lens frame has an insertion port into which a stopper member for holding the engagement in the bayonet type can be inserted in a direction intersecting the optical axis. Lens device.

[0013] (8) The lens device according to any one of (1) to (7), The second lens frame has a light quantity adjustment member, The outer diameter of the second lens includes a lens that is larger than the outer diameter of the light quantity adjustment member when viewed in the optical axis direction. Lens device.

[0014] (9) The lens device according to (1), Comprising a moving mechanism for moving the first lens and the second lens with respect to the housing. Lens device.

[0015] (10) The lens device according to (9), The moving mechanism is a mechanism that moves while maintaining the relative positions of the first lens and the second lens. Lens device.

[0016] (11) (10) Lens device as described above, The above-mentioned moving mechanism is A fixing cylinder fixed to the above housing and having a groove, A cam cylinder having a cam groove, The cam follower provided in the second lens frame mentioned above, Includes, The cam follower engages with the cam groove via the groove. Lens device.

[0017] (12) An imaging device comprising a lens device as described in any one of (1) to (11). [Effects of the Invention]

[0018] According to the present invention, it is possible to provide a lens device and an imaging device that can be miniaturized. [Brief explanation of the drawing]

[0019] [Figure 1] This is a perspective view showing an example of the lens device 100 of this embodiment. [Figure 2] This is a cross-sectional view in the vertical direction showing the configuration of the lens device 100. [Figure 3] This is a perspective view showing the configuration of the first lens frame 10. [Figure 4] This is a perspective view showing the configuration of the retaining frame 30. [Figure 5] This is a perspective view showing the configuration of the second lens frame 20. [Figure 6] This is a perspective view showing an example of the assembled state of the first lens frame 10, retaining frame 30, second lens frame 20, and adjustment mechanism 40. [Figure 7] This is a front view showing an example of the assembled state of the first lens frame 10, the retaining frame 30, and the adjustment mechanism 40. [Figure 8] This is a front view showing an example of the assembled state of the retaining frame 30, the second lens frame 20, and the adjustment mechanism 40. [Figure 9]This is a perspective view showing an example of the assembled state of the retaining frame 30 and the second lens frame 20. [Figure 10] This is a side view showing an example of the assembled state of the retaining frame 30 and the second lens frame 20. [Figure 11] This is a perspective view showing the cam mechanism 60 of the lens device 100. [Figure 12] This is a perspective view showing the fixed cylinder 61 of the cam mechanism 60. [Figure 13] This is a perspective view showing the cam cylinder 62 of the cam mechanism 60. [Figure 14] This is a perspective view showing the pull-out of the FPC 51 connected to the aperture unit 50. [Modes for carrying out the invention]

[0020] 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.

[0021] <Lens device of the 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 SLR 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 the camera body (not shown). The lens device 100 is configured in a substantially cylindrical shape overall.

[0022] Figure 2 is a vertical cross-sectional view showing the configuration of the lens device 100. As shown in Figure 2, the lens device 100 comprises a front lens group (e.g., first lenses 1A, 1B) positioned at the front of the lens device 100, and a rear lens group (e.g., second lenses 2A, 2B, 2C, 2D) positioned at the rear. The "first lenses 1A, 1B" are one or more lenses located in front of (towards the subject) the second lenses 2A, 2B, 2C, 2D. The "second lenses 2A-2D" are one or more lenses located behind (towards the image sensor) the first lenses 1A, 1B.

[0023] The lens device 100 also includes a first lens frame 10 for holding the first lenses 1A and 1B, a retaining frame 30 for holding the first lens frame 10, an adjustment mechanism 40 for adjusting the positional relationship between the retaining frame 30 and the first lens frame 10, and a second lens frame 20 for holding the second lenses 2A to 2D. The "positional relationship" between the retaining frame 30 and the first lens frame 10 refers to at least one of the position (shift position) and tilt (tilt) on a plane perpendicular to the optical axis X. The "optical axis X" refers to the optical axis of the optical system composed of the first lenses 1A and 1B and the second lenses 2A to 2D.

[0024] The adjustment mechanism 40 includes a tilt adjustment mechanism that can adjust the inclination of the first lens frame 10 relative to the retaining frame 30, and a shift adjustment mechanism that can adjust the relative position of the first lens frame 10 relative to the retaining frame 30. The tilt adjustment mechanism includes, for example, a screw hole in the retaining frame 30, a through hole in the first lens frame 10, and a tilt adjustment screw, and the inclination of the first lens frame 10 relative to the retaining frame 30 is adjusted by tightening or loosening the tilt adjustment screw. The shift adjustment mechanism includes, for example, a screw hole in the retaining frame 30, a through hole in the first lens frame 10, and a shift adjustment screw, and the position of the first lens frame 10 relative to the retaining frame 30 is adjusted by tightening or loosening the shift adjustment screw. The shift adjustment screw is, for example, an eccentric screw. The tilt adjustment mechanism is an example of the first adjustment mechanism of the present invention. The shift adjustment mechanism is an example of the second adjustment mechanism of the present invention. The "tailgating adjustment mechanism" and the "shift adjustment mechanism" will be described later in Figures 3, 4, and 6.

[0025] The retaining frame 30 and the second lens frame 20 are engaged, for example, by a bayonet or snap-fit ​​mechanism. The retaining frame 30 has a first engaging portion for engaging with the second lens frame 20. The second lens frame 20 has a second engaging portion for engaging with the retaining frame 30. The retaining frame 30 and the second lens frame 20 are connected by bayonet engagement of the first engaging portion of the retaining frame 30 and the second engaging portion of the second lens frame 20, without the need for screws. The first and second engaging portions will be described later in Figures 4 and 5.

[0026] The second lens frame 20 has an aperture unit 50. The aperture unit 50 is provided at the front end of the second lens frame 20. The aperture unit 50 is an example of the "light intensity adjustment member" of the present invention. The aperture unit 50 adjusts the aperture opening amount by controlling the aperture drive unit (not shown). As an example of the "light intensity adjustment member," in addition to the "aperture unit," an "electronic ND (Neutral Density) filter" or the like may also be used.

[0027] The second lenses 2A to 2D include lenses that are larger than the outer diameter R1 of the aperture unit 50 when viewed in the optical axis X direction. "Larger" means, for example, that the circle circumscribing the second lenses 2A to 2D with the optical axis X as the center is larger than the circle circumscribing the aperture unit 50 with the optical axis X as the center. In this example, of the second lenses 2A to 2D, the outer diameter R2 of the second lens 2D is larger than the outer diameter R1 of the aperture unit 50. Note that "larger" means that the outer diameter of the largest lens among the second lenses is larger than the outer diameter R1 of the aperture unit 50.

[0028] Figure 3 is a perspective view showing the configuration of the first lens frame 10. As shown in Figure 3, the first lens frame 10 is formed in a substantially disc shape, and an opening 11 is formed in its center, opening in a circular shape on and around the optical axis X. In addition, the first lens frame 10 has a projection 12 that protrudes in an annular shape toward the rear on its rear surface.

[0029] Furthermore, the first lens frame 10 has through holes 13a, 13b, and 13c that constitute the tilt adjustment mechanism, and through holes 14a and 14b that constitute the shift adjustment mechanism. The first lens frame 10 also has a boss hole 15 that engages with a positioning boss 35 (described later in Figure 4) provided on the retaining frame 30.

[0030] Furthermore, the first lens frame 10 has arc-shaped ribs 16a, 16b, 16c, 16d, and 16e projecting forward on its front side. The first lens frame 10 also has notches 17a, 17b, 17c, 17d, 17e, and 17f recessed radially inward on its periphery. The notches 17a to 17f are notches into which adhesive, for example, is poured to fix the first lens frame 10 to the retaining frame 30 after adjusting the inclination and position of the first lens frame 10 relative to the retaining frame 30.

[0031] In the first lens frame 10, the through-holes 13a to 13c that constitute the tilt adjustment mechanism and the through-holes 14a and 14b that constitute the shift adjustment mechanism are arranged along the optical axis X. Furthermore, in the first lens frame 10, the through-holes 13a to 13c that constitute the tilt adjustment mechanism and the through-holes 14a and 14b that constitute the shift adjustment mechanism are arranged along different positions around the optical axis X.

[0032] "Different positions around the optical axis X" means, for example, that the through-hole 14a of the shift adjustment mechanism is positioned between the through-holes 13a and 13b of the tilt adjustment mechanism, and the through-hole 14b of the shift adjustment mechanism is positioned between the through-holes 13b and 13c of the tilt adjustment mechanism, or that the through-hole 13b of the tilt adjustment mechanism is positioned between the through-holes 14a and 14b of the shift adjustment mechanism.

[0033] Furthermore, in the first lens frame 10, the notches 17a to 17f are arranged along different positions around the optical axis X, corresponding to the through holes 13a to 13c for the tilt adjustment mechanism and the through holes 14a and 14b for the shift adjustment mechanism. Alternatively, protrusions may be provided on the periphery of the first lens frame 10 instead of the notches 17a to 17f.

[0034] Furthermore, in the first lens frame 10, the ribs 16a to 16e are arranged along different positions around the optical axis X, corresponding to the through holes 13a to 13c for the tilt adjustment mechanism and the through holes 14a and 14b for the shift adjustment mechanism. Also, on the front surface of the first lens frame 10, the surface roughness of the rib portions 16a to 16e is configured to be different from the surface roughness of the portions that are not rib portions 16a to 16e.

[0035] The ribs 16a to 16e can be used as markers to recognize the orientation of the first lens frame 10 and the overall position of the first lens frame 10, for example, by recognizing their positions based on surface roughness using image recognition. This makes it possible to use them for detecting the initial position of optical adjustment and assembly in the automated assembly of the lens device 100. Alternatively, grooves may be provided on the front side of the first lens frame 10 instead of the ribs 16a to 16e.

[0036] Furthermore, in the first lens frame 10, the ribs 16a to 16e and the notches 17a to 17f are positioned at different locations in the radial direction but overlap around the optical axis X. The ribs 16a to 16e are located inside the notches 17a to 17f.

[0037] Figure 4 is a perspective view showing the configuration of the retaining frame 30. As shown in Figure 4, the retaining frame 30 is formed in a substantially disc shape, and an opening 31 is formed in its center, which opens in a circular shape on and around the optical axis X. In addition, the retaining frame 30 has a projection 32 that protrudes in an annular shape toward the rear on its rear surface.

[0038] Furthermore, the retaining frame 30 has screw holes 33a, 33b, and 33c that constitute the tilt adjustment mechanism, and screw holes 34a and 34b that constitute the shift adjustment mechanism. The retaining frame 30 also has a positioning boss 35 that engages with a boss hole 15 provided in the first lens frame 10. The positioning boss 35 is a reference boss for determining the position of the first lens frame 10 relative to the retaining frame 30.

[0039] Furthermore, a circular or arc-shaped rib 36 protruding forward is formed on the front side of the retaining frame 30. In the example shown in Figure 4, an arc-shaped rib 36 is formed with a portion missing that faces the positioning boss 35. The rib 36 is formed radially outward from the positioning boss 35 of the retaining frame 30. Also, the rib 36 is formed radially outward from the screw holes 33a-33c and screw holes 34a, 34b of the retaining frame 30.

[0040] Furthermore, the retaining frame 30 has groove engagement portions 37a, 37b, and 37c formed therein for engaging with the second lens frame 20, for example, via a bayonet. Multiple groove engagement portions (three in this example) are formed. Groove engagement portions 37a to 37c are examples of the "first engagement portion" of the present invention.

[0041] Furthermore, the retaining frame 30 has an insertion opening 38 into which, for example, a stopper member can be inserted to maintain the bayonet engagement with the second lens frame 20. The insertion opening 38 will be described later in Figures 8, 9, and 10.

[0042] Furthermore, the retaining frame 30 has a mounting portion 39 for fixing a sheet metal 53 (described later in Figure 14) which stabilizes the position of the FPC (Flexible Printed Circuits) lead-out wiring connected to the aperture unit 50.

[0043] In the retaining frame 30, the screw holes 33a to 33c constituting the tilt adjustment mechanism, the screw holes 34a and 34b constituting the shift adjustment mechanism, and the groove engagement portions 37a to 37c are arranged along the optical axis X. Furthermore, in the retaining frame 30, the screw holes 33a to 33c constituting the tilt adjustment mechanism, the screw holes 34a and 34b constituting the shift adjustment mechanism, and the groove engagement portions 37a to 37c are arranged along different positions around the optical axis X. In addition, the screw holes 33a to 33c are formed at intervals corresponding to the positions of the through holes 13a to 13c of the first lens frame 10. The screw holes 34a and 34b are formed at intervals corresponding to the positions of the through holes 14a and 14b of the first lens frame 10.

[0044] When the first lens frame 10 is held in the retaining frame 30, the first lens frame 10 is positioned from the front side of the retaining frame 30, engaging the boss hole 15 of the first lens frame 10 with the positioning boss 35 of the retaining frame 30, and the positions of the screw holes 33a to 33c and screw holes 34a and 34b of the retaining frame 30 are aligned with the positions of the through holes 13a to 13c and through holes 14a and 14b of the first lens frame 10, and the protrusions 12 of the first lens frame 10 are fitted into the openings 31 and 32 of the retaining frame 30.

[0045] Figure 5 is a perspective view showing the configuration of the second lens frame 20. As shown in Figure 5, the second lens frame 20 is formed in a substantially cylindrical shape. The second lenses 2A to 2D are held inside the second lens frame 20, as described in Figure 2. An aperture unit 50 is also provided in the second lens frame 20.

[0046] The second lens frame 20 has claw engagement portions 21a, 21b, and 21c formed thereon for engaging with the retaining frame 30, for example, using a bayonet mount. Multiple claw engagement portions (three in this example) are formed. The claw engagement portions 21a to 21c extend forward from the front end of the second lens frame 20, with the claw portions protruding radially outward. The claw engagement portions 21a to 21c are examples of the "second engagement portion" of the present invention. The claw engagement portions 21a to 21c of the second lens frame 20 engage with the groove engagement portions 37a to 37c of the retaining frame 30 by bayonet mount, respectively. The claw engagement portions 21a to 21c are formed at intervals corresponding to the positions of the groove engagement portions 37a to 37c.

[0047] Furthermore, cam followers 22a, 22b, and 22c are attached to the outer circumference of the second lens frame 20, extending radially outward. The cam followers 22a, 22b, and 22c are attached at equal intervals (120-degree intervals). The cam followers 22a, 22b, and 22c are attached, for example, to positions corresponding to the positions of the claw engagement portions 21a to 21c. The cam followers 22a, 22b, and 22c engage with the fixed cylinder 61 (described later in Figures 11 and 12) and the cam cylinder 62 (described later in Figures 11 and 13), which constitute the cam mechanism 60 (described later in Figure 11).

[0048] When engaging the second lens frame 20 and the retaining frame 30, the retaining frame 30 is assembled from the front of the fixed cylinder 61, and the second lens frame 20 is assembled from the rear of the fixed cylinder 61, so that the claw engaging portions 21a to 21c of the second lens frame 20 engage with the groove engaging portions 37a to 37c of the retaining frame 30, respectively.

[0049] Figure 6 is a perspective view showing an example of the assembled state of the first lens frame 10, the retaining frame 30, the second lens frame 20, and the adjustment mechanism 40. As shown in Figure 6, the boss hole 15 of the first lens frame 10 is engaged with the positioning boss 35 of the retaining frame 30, and the tilt adjustment screws 43a, 43b, and 43c, which constitute the tilt adjustment mechanism, and the shift adjustment screws 44a and 44b, which constitute the shift adjustment mechanism, are attached.

[0050] The tilt adjustment screw 43a is screwed into the screw hole 33a of the retaining frame 30 via the through hole 13a of the first lens frame 10. The tilt adjustment screw 43b is screwed into the screw hole 33b of the retaining frame 30 via the through hole 13b of the first lens frame 10. The tilt adjustment screw 43c is screwed into the screw hole 33c of the retaining frame 30 via the through hole 13c of the first lens frame 10. In addition, the shift adjustment screw 44a is screwed into the screw hole 34a of the retaining frame 30 via the through hole 14a of the first lens frame 10. The shift adjustment screw 44b is screwed into the screw hole 34b of the retaining frame 30 via the through hole 14b of the first lens frame 10.

[0051] The three tilt adjustment screws 43a, 43b, and 43c are mounted at equal intervals (120-degree intervals) along the optical axis X. The shift adjustment screw 44a is mounted along the optical axis X between the tilt adjustment screws 43a and 43b. The shift adjustment screw 44b is mounted along the optical axis X between the tilt adjustment screws 43b and 43c. The positioning boss 35 is provided between the tilt adjustment screws 43c and 43a.

[0052] The tilt adjustment mechanism includes a first tilt adjustment mechanism consisting of a tilt adjustment screw 43a, a through hole 13a in the first lens frame 10, and a screw hole 33a in the retaining frame 30; a second tilt adjustment mechanism consisting of a tilt adjustment screw 43b, a through hole 13b in the first lens frame 10, and a screw hole 33b in the retaining frame 30; and a third tilt adjustment mechanism consisting of a tilt adjustment screw 43c, a through hole 13c in the first lens frame 10, and a screw hole 33c in the retaining frame 30.

[0053] The shift adjustment mechanism includes a first shift adjustment mechanism consisting of a shift adjustment screw 44a, a through hole 14a in the first lens frame 10, and a screw hole 34a in the retaining frame 30, and a second shift adjustment mechanism consisting of a shift adjustment screw 44b, a through hole 14b in the first lens frame 10, and a screw hole 34b in the retaining frame 30.

[0054] The first lens frame 10 is assembled inside the arc-shaped rib 36 formed on the retaining frame 30. By tightening or loosening the tilt adjustment screws 43a, 43b, and 43c, it is possible to adjust the tilt of the first lens frame 10 relative to the retaining frame 30, that is, the tilt of the first lenses 1A and 1B held in the first lens frame 10. Also, by tightening or loosening the shift adjustment screws 44a and 44b, it is possible to adjust the position of the first lens frame 10 relative to the retaining frame 30, that is, the position of the first lenses 1A and 1B held in the first lens frame 10.

[0055] Furthermore, a nut 45 is installed inside the mounting portion 39 of the retaining frame 30 to secure the sheet metal 53 (described later in Figure 14) that supports the FPC of the aperture unit 50. The nut 45 fastens the sheet metal 53 to the back side of the mounting portion 39 by screwing it into a screw inserted from the rear side of the mounting portion 39.

[0056] Figure 7 is a front view showing an example of the assembled state of the first lens frame 10, the retaining frame 30, and the adjustment mechanism 40. As shown in Figure 7, a spring 46 is provided between the retaining frame 30 and the first lens frame 10 which is assembled to the retaining frame 30. The spring 46 is a spring that biases the retaining frame 30 and the first lens frame 10 to move away from each other. Multiple springs 46 (three in this example) are provided, and are positioned, for example, close to the tilt adjustment screws 43a, 43b, and 43c. When adjusting the tilt of the first lens frame 10, the tilt adjustment screws 43a, 43b, and 43c are adjusted based on the biasing force of these springs 46.

[0057] Figure 8 is a front view showing an example of the assembled state of the retaining frame 30, the second lens frame 20, and the adjustment mechanism 40. Figure 9 is a perspective view showing an example of the assembled state of the retaining frame 30 and the second lens frame 20. Figure 10 is a side view showing an example of the assembled state of the retaining frame 30 and the second lens frame 20. Note that in Figure 8, the tilt adjustment screws 43a to 43c and the shift adjustment screws 44a and 44b of the adjustment mechanism 40 are attached to the assembled retaining frame 30 and the second lens frame 20.

[0058] As shown in Figures 8 to 10, the retaining frame 30 and the second lens frame 20 are connected by the following: the claw engaging portion 21a of the second lens frame 20 engages with the groove engaging portion 37a of the retaining frame 30; the claw engaging portion 21b of the second lens frame 20 engages with the groove engaging portion 37b of the retaining frame 30; and the claw engaging portion 21c of the second lens frame 20 engages with the groove engaging portion 37c of the retaining frame 30.

[0059] The claw engagement portions 21a to 21c of the second lens frame 20, which engage with the groove engagement portions 37a to 37c of the retaining frame 30, the tilt adjustment screws 43a to 43c that constitute the tilt adjustment mechanism, and the shift adjustment screws 44a and 44b that constitute the shift adjustment mechanism are arranged along the optical axis X. Furthermore, the claw engagement portions 21a to 21c, the tilt adjustment screws 43a to 43c, and the shift adjustment screws 44a and 44b are arranged along different positions around the optical axis X.

[0060] The retaining frame 30 and the second lens frame 20 engage in a bayonet-type manner, and at least one of the groove engagement portions 37a to 37c of the retaining frame 30 and the claw engagement portions 21a to 21c of the second lens frame 20 has an insertion opening 38 into which a stopper member 47 that maintains the bayonet-type engagement can be inserted. The insertion opening 38 allows the stopper member 47 to be inserted in a direction intersecting the optical axis X. "At least one of the groove engagement portions 37a to 37c of the retaining frame 30 and the claw engagement portions 21a to 21c of the second lens frame 20" refers to the groove engagement portions 37a to 37c on the female side of the bayonet structure (in this example, the retaining frame 30).

[0061] As described above, the lens device 100 of this embodiment includes a first lens frame 10 for holding the first lenses 1A and 1B, a holding frame 30 for holding the first lens frame 10, a tilt adjustment mechanism that can adjust the inclination of the first lens frame 10 relative to the holding frame 30, a shift adjustment mechanism that can adjust the position of the first lens frame 10 relative to the holding frame 30, and a second lens frame 20 for holding the second lenses 2A to 2D, with groove engagement portions 37a to 37c of the holding frame 30 and claw engagement portions 21a to 21c of the second lens frame 20 engaging in a bayonet-type manner. However, in recent years, with the increasing resolution of wide-angle lenses, it is unavoidable that the final element (rear element) or the lens adjacent to the final element will become larger. Furthermore, a complex adjustment mechanism is required to achieve high resolution. In contrast, with the lens device 100, by using a bayonet-type engagement between the holding frame 30 and the second lens frame 20, the screw fastening structure between the two can be eliminated. Therefore, the engagement space required for the engagement between the retaining frame 30 and the second lens frame 20 can be reduced. This makes it possible to miniaturize the lens device 100, for example, when an adjustment mechanism is required between the first lens frame 10 and the retaining frame 30, or when a larger lens is required.

[0062] Furthermore, according to the lens device 100, the second lens frame 20 has an aperture unit 50, and the second lenses 2A to 2D include lenses that are larger than the outer diameter R1 of the aperture unit 50 when viewed in the optical axis X direction. In this way, when the second lenses 2A to 2D have lenses with a diameter larger than the outer diameter of the aperture unit 50, the lens device 100 can be miniaturized by using a bayonet-type engagement between the retaining frame 30 and the second lens frame 20.

[0063] Furthermore, in the lens device 100, the tilt adjustment screws 43a, 43b, and 43c of the tilt adjustment mechanism, the shift adjustment screws 44a and 44b of the shift adjustment mechanism, and the groove engagement portions 37a to 37c of the retaining frame 30 are arranged along the optical axis X. Therefore, the spreading of each component in the radial direction can be suppressed, making it possible to miniaturize the lens device 100.

[0064] Furthermore, in the lens device 100, the tilt adjustment screws 43a, 43b, and 43c of the tilt adjustment mechanism, the shift adjustment screws 44a and 44b of the shift adjustment mechanism, and the groove engagement portions 37a to 37c of the retaining frame 30 are arranged along different positions around the optical axis X. This makes it possible to achieve both tilt adjustment and shift adjustment of the first lens frame 10 relative to the retaining frame 30, and bayonet-type engagement between the retaining frame 30 and the second lens frame 20.

[0065] Furthermore, in the lens device 100, at least one of the groove engagement portions 37a to 37c of the retaining frame 30 and the claw engagement portions 21a to 21c of the second lens frame 20 has an insertion opening 38 formed in a direction intersecting the optical axis X. By inserting the stopper member 47 into the insertion opening 38, the bayonet-type engagement between the two can be maintained. As a result, even when the first lens frame 10 is assembled to the retaining frame 30, for example, the stopper member 47 can be inserted into the insertion opening 38 from the side (outer circumference) after the retaining frame 30 and the second lens frame 20 have been bayonet-engaged. This increases the degree of freedom in the assembly procedure of the lens device 100.

[0066] <Cam mechanism of lens device 100> Figure 11 is a perspective view showing the cam mechanism 60 of the lens device 100. Figure 12 is a perspective view showing the fixed cylinder 61 of the cam mechanism 60. Figure 13 is a perspective view showing the cam cylinder 62 of the cam mechanism 60.

[0067] The cam mechanism 60 moves the first lenses 1A, 1B and the second lenses 2A-2D in the front-to-back direction along the optical axis X relative to the housing of the lens device 100. The cam mechanism 60 is an example of the "movement mechanism" of the present invention. "Housing" refers to the lens barrel of the lens device 100. The lens barrel is fixed to a lens mount, for example. "Moving the first and second lenses..." means moving (extending the entire lens) while maintaining the relative positions of the first lenses 1A, 1B and the second lenses 2A-2D. The movement is, for example, movement for focus adjustment.

[0068] As shown in Figure 11, the cam mechanism 60 includes a fixed cylinder 61, a cam cylinder 62, and cam followers 22a to 22c. The fixed cylinder 61 has a plate-shaped portion and a cylindrical portion extending rearward from the plate-shaped portion. As shown in Figure 12, the cylindrical portion of the fixed cylinder 61 has straight grooves 63a, 63b, and 63c formed in it that are parallel to the optical axis X. The plate-shaped portion of the fixed cylinder 61 is fixed to the housing of the lens device 100. The straight grooves 63a, 63b, and 63c are examples of the "grooves" of the present invention.

[0069] As shown in Figure 13, cam grooves 64a, 64b, and 64c are formed in the cam cylinder 62. The cam grooves 64a to 64c are formed to be inclined in one direction in the circumferential direction of the cam cylinder 62. The cam cylinder 62 is mounted on the outside of the cylindrical portion of the fixed cylinder 61.

[0070] The cam followers 22a to 22c are attached to the second lens frame 20, as explained in Figure 5. The cam followers 22a to 22c engage with the cam grooves 64a to 64c of the cam cylinder 62 via the straight grooves 63a, 63b, and 63c of the fixed cylinder 61.

[0071] In Figure 11, the retaining frame 30 and the first lens frame 10 held by the retaining frame 30 are assembled into the fixed cylinder 61 from the front side toward the inside of the fixed cylinder 61. On the other hand, the second lens frame 20 is assembled into the fixed cylinder 61 from the rear side toward the inside of the fixed cylinder 61. The groove engagement portions 37a to 37c of the retaining frame 30 and the claw engagement portions 21a to 21c of the second lens frame 20 are engaged by bayonet engagement. The cam cylinder 62 is attached to the outside of the cylindrical portion of the fixed cylinder 61 into which the first lens frame 10, retaining frame 30, and second lens frame 20 are assembled. The cam followers 22a to 22c are attached to the second lens frame 20 into which the fixed cylinder 61 and cam cylinder 62 are assembled via the straight grooves 63a, 63b, 63c of the fixed cylinder 61 and the cam grooves 64a to 64c of the cam cylinder 62.

[0072] The second lens frame 20, the retaining frame 30 engaged with the second lens frame 20 via a bayonet, and the first lens frame 10 held by the retaining frame 30 move back and forth along the optical axis X within the fixed cylinder 61 and the cam cylinder 62 by the cam mechanism 60, by rotating the cam cylinder 62 around the optical axis X. As a result, the first lenses 1A, 1B and the second lenses 2A to 2D move in the direction of the optical axis X.

[0073] Thus, with the lens device 100, by using a bayonet engagement between the retaining frame 30 and the second lens frame 20, the retaining frame 30 and the first lens frame 10 can be assembled to the fixing cylinder 61 of the cam mechanism 60 from the front of the fixing cylinder 61, and the second lens frame 20 can be assembled to the fixing cylinder 61 from the rear of the fixing cylinder 61. This makes it possible to suppress the enlargement of the fixing cylinder 61, even when a larger lens is required, or when an adjustment mechanism is required between the first lens frame 10 and the retaining frame 30, thereby enabling miniaturization of the lens device 100.

[0074] <FPC of aperture unit 50> Figure 14 is a perspective view showing the extension of the FPC 51 connected to the aperture unit 50. In terms of the configuration within the lens device 100, it is desirable that the FPC 51 of the aperture unit 50 be extended to the front side (subject side) in the optical axis X direction. Furthermore, it is desirable that the length of the extended FPC 51 be as short as possible.

[0075] Therefore, when the FPC 51 is pulled out to the front in the optical axis X direction and the direction of routing of the pulled-out FPC 51 is changed, the routing path is made diagonal (solid line path) instead of perpendicular (dashed line path) (right-angle path) (dashed line path). This suppresses an increase in the length of the FPC 51 and reduces the space used by routing the FPC 51 within the lens device 100.

[0076] Furthermore, the FPC 51, which is pulled out from the aperture unit 50, is supported by a sheet metal 53 to stabilize the wiring position, as described above. The sheet metal 53 is screwed to the back side of the mounting portion 39 (see Figure 6) of the retaining frame 30 with a nut 45. In this case, the thickness of the mounting portion 39 with the sheet metal 53 screwed to it with the nut 45 is configured to be thinner than the thickness of the plate-shaped portion of the fixed cylinder 61 (see Figure 11) on which the retaining frame 30 moves back and forth along the optical axis X. This reduces the space used by providing the mounting portion 39 within the lens device 100, and increases the design freedom of, for example, the cam mechanism 60.

[0077] <Modified examples of the first lens frame 10 and the retaining frame 30> In the embodiment described above, the first lens frame 10 and the retaining frame 30 are separate components, and the first lens frame 10 is assembled to the retaining frame 30. However, the embodiment is not limited to this. For example, the first lens frame and the retaining frame may be configured as a single integrated frame (hereinafter referred to as the integrated frame). In such a configuration, the integrated frame and the second lens frame are bayonet-engaged, but a predetermined gap is provided between the engagement parts, for example, the groove engagement part of the integrated frame and the claw engagement part of the second lens frame, which are bayonet-engaged. Providing a predetermined gap means that there is some play in the engagement state between the two engagement parts, and the inclination and position of the engagement between the two engagement parts can be changed. After providing a gap between the engagement parts in this way and bayonet-engaging the integrated frame and the second lens frame, the position and inclination of the integrated frame with respect to the optical axis X direction are adjusted, and the integrated frame and the second lens frame are fixed together, for example, with adhesive, once the adjustment is complete. [Explanation of Symbols]

[0078] 1A, 1B First lens 2A~2D Second Lens 2D Second Lens 10. First lens frame 11,31 Opening 12,32 Protrusion 13a~13c, 14a, 14b Through holes 15 Boss holes 16a,36 16a~16e 17a~17f Notches 20. Second lens frame 21a~21c Claw engaging part 22a~22c Cam Follower 30 holding slots 33a~33c screw hole 35 Boss 37a~37c Groove engagement part 38 Insertion opening 39 Mounting part 40 Adjustment mechanism 43a~43c Adjustment screws 44a, 44b Shift adjustment screw 45 nuts 46 Springs 47 Stopper component 50 units 51 FPC Routes 52a and 52b 53 Sheet metal 60 Cam mechanism 61 Fixed cylinder 62 Cam cylinder 63a, 63b, 63c Straight groove 64a~64c Cam groove 100 Lens device R1,R2 Outer diameter

Claims

1. A first lens frame that holds the first lens, A retaining frame that holds the first lens frame, An adjustment mechanism that can adjust the positional relationship between the retaining frame and the first lens frame, It comprises a second lens frame that holds the second lens, The first engaging portion of the retaining frame and the second engaging portion of the second lens frame engage with each other. Lens device.

2. A lens device according to claim 1, The adjustment mechanism is, A first adjustment mechanism capable of adjusting the inclination of the first lens frame with respect to the retaining frame, A second adjustment mechanism that can adjust the position of the first lens frame relative to the retaining frame, including, Lens device.

3. A lens device according to claim 2, The retaining frame has a plurality of the first engaging portions, The second lens frame has a plurality of the second engaging portions, Lens device.

4. A lens device according to claim 3, The first adjustment mechanism, the second adjustment mechanism, and the first engagement portion are arranged along the optical axis. Lens device.

5. A lens device according to claim 4, The first adjustment mechanism, the second adjustment mechanism, and the first engagement portion are arranged along different positions around the optical axis. Lens device.

6. A lens device according to claim 1, The first engaging portion and the second engaging portion engage in a bayonet type or snap-fit ​​type manner. Lens device.

7. A lens device according to claim 6, The first engaging portion of the retaining frame and the second engaging portion of the second lens frame engage in the bayonet type, At least one of the first engaging portion of the retaining frame and the second engaging portion of the second lens frame has an insertion opening into which a stopper member that holds the bayonet-type engagement can be inserted in a direction intersecting the optical axis. Lens device.

8. A lens device according to claim 1, The second lens frame has a light intensity adjusting member, The outer diameter of the second lens includes a lens that is larger than the outer diameter of the light intensity adjusting member when viewed in the direction of the optical axis. Lens device.

9. A lens device according to claim 1, It includes a moving mechanism for moving the first lens and the second lens relative to the housing. Lens device.

10. A lens device according to claim 9, The aforementioned moving mechanism is a mechanism that moves the first lens and the second lens while maintaining their relative positions. Lens device.

11. A lens device according to claim 10, The aforementioned moving mechanism is A fixing cylinder fixed to the housing and having a groove, A cam cylinder having a cam groove, A cam follower provided on the second lens frame, Includes, The cam follower engages with the cam groove via the groove. Lens device.

12. An imaging device comprising a lens device according to any one of claims 1 to 11.

Images