Lens device and imaging device

Abstract

To rotate a lens unit with respect to a stationary member without adding turning force to a hold-down member to allow positioning in an optical axis direction.SOLUTION: A lens device 100 rotates a lens unit 10 with respect to a stationary member 6 with which the lens unit is screwed around an optical axis to allow positioning of the lens unit with respect to the stationary member in an optical axis direction. The lens unit has a holding member 20 that holds a lens 1 and is screwed with the stationary member, and a hold-down member 40 that is screwed with the holding member and holds down the lens with respect to the holding member in the optical axis direction. The holding member has an engagement part 20d that can be engaged with a tool 90 used to rotate the lens unit around the optical axis with respect to the stationary member. The hold-down member has a hole part 40c penetrating in the optical axis direction. The hole part allows engagement of the tool with the engagement part therethrough.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a lens holding structure in a lens device. [Background technology]

[0002] In order to fix the lens closest to the object side or the lens closest to the image side to a holding member such as a lens barrel in a lens apparatus, a pressing member such as a pressing ring that presses the lens held by the holding member is often used.

[0003] Patent Document 1 discloses a lens device using a retaining ring with a female thread that screws into the male thread of the lens barrel to secure the lens closest to the object to the lens barrel. In this lens device, recesses or openings provided at multiple locations around the circumference of the retaining ring are filled with adhesive to secure the lens to the retaining ring and the retaining ring to the lens barrel. Patent Document 2 also discloses a lens device using a retaining ring with a male thread that screws into the female thread of the lens barrel to secure the lens closest to the image. In this lens device, recesses are provided at multiple locations around the circumference of the female thread of the retaining ring, and the lenses are secured by filling the recesses with adhesive.

[0004] A lens device such as those disclosed in Patent Documents 1 and 2 has a male thread on the outer periphery of its barrel, and by rotating the barrel around the optical axis relative to a fixed member such as a fixed barrel that has a female thread that screws into the male thread, it is possible to adjust the position of the barrel in the optical axis direction relative to the fixed barrel. The position adjustment is performed, for example, as a focus adjustment. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2020-027278 [Patent Document 2] Japanese Patent Application Publication No. 2018-141861 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the lens device of Patent Document 1, when a rotational force is applied to the retaining ring to rotate the lens barrel relative to the fixed barrel, there is a risk that the adhesion between the retaining ring and the lens or lens barrel will come off. Although it is possible to provide an opening in the peripheral wall of the fixed barrel so that the lens barrel can be accessed from the outside in the radial direction and a rotational force can be applied to the lens barrel, it is necessary to cover the opening to prevent the intrusion of external light and dust after position adjustment, which increases the number of parts and the assembly man-hours.

[0007] On the other hand, if the retaining ring is positioned further toward the image side than the lens closest to the image side, as in the lens device of Patent Document 2, the length of the space required in the optical axis direction between the lens and the image plane becomes large, making it difficult to construct a compact lens device with a short flange back.

[0008] The present invention provides a small lens device in which a lens is fixed to a holding member using a pressing member, and the position of the lens unit in the optical axis direction can be adjusted by rotating the lens unit relative to the fixed member without applying a rotational force to the pressing member, and an imaging device using the same. [Means for solving the problem]

[0009] According to one aspect of the present invention, a lens device is provided that allows for adjustment of the position of the lens unit relative to a fixed member in the optical axis direction by rotating the lens unit about the optical axis relative to the fixed member to which the lens unit is screwed. The lens unit includes a holding member that holds a lens and is screwed to the fixed member, and a lens that is screwed to the holding member and that can be adjusted relative to the holding member in the optical axis direction. From the rear The lens unit has a holding member that holds the lens unit. The holding member has an engaging portion that can be engaged with a tool used to rotate the lens unit around the optical axis relative to the fixed member. The holding member has a hole that penetrates in the optical axis direction. The hole is characterized in that it allows the tool to engage with the engaging portion through it.

[0010] Another aspect of the present invention provides a lens device that allows adjustment of the position of the lens unit in the optical axis direction relative to a fixed member to which the lens unit is screwed by rotating the lens unit about the optical axis relative to the fixed member. The lens unit includes a holding member that holds the lens and screws into the fixed member, and a pressing member that screws into the holding member and presses the lens against the holding member in the optical axis direction. The holding member has a pair of engaging portions located on opposite sides of the optical axis. The pressing member is characterized by having a pair of hole portions that penetrate in the optical axis direction and are located on opposite sides of the optical axis so as to overlap with the pair of engaging portions in the optical axis direction. Note that an imaging device including the above-described lens device also constitutes another aspect of the present invention. [Effects of the Invention]

[0011] According to the present invention, it is possible to realize a small lens device in which a lens is fixed to a holding member using a pressing member, and the position of the lens unit in the optical axis direction can be adjusted by rotating the lens unit relative to the fixed member without applying a rotational force to the pressing member. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a cross-sectional view of the camera module according to the first embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the camera module according to the first embodiment. [Figure 3] FIG. 2 is a perspective view showing a focus adjustment tool used in the camera module of the first embodiment. [Figure 4] 5A to 5C are cross-sectional views showing a focus adjustment process in the first embodiment. [Figure 5] 4 is a diagram showing the positional relationship between an arc-shaped hole portion and a tool engagement portion in the first embodiment. FIG. [Figure 6] FIG. 10 is a cross-sectional view of a camera module according to a second embodiment. [Figure 7] FIG. 10 is an exploded perspective view of a camera module according to a second embodiment. [Figure 8] FIG. 10 is a perspective view of a focus adjustment tool used in the camera module of the second embodiment. [Figure 9]10A to 10C are cross-sectional views showing a focus adjustment process in the second embodiment. [Figure 10] 10 is a diagram showing the positional relationship between the arc hole portion and the tool engagement portion in the second embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [Example]

[0014] 1 shows a cross section of a camera module 100 as an imaging device according to a first embodiment of the present invention. In the figure, O indicates the optical axis of a lens unit 10, which will be described later, and the direction in which the optical axis O extends is referred to as the optical axis direction.

[0015] The camera module 100 is made up of a lens unit 10, a fixed barrel 6 as a fixed member, a sensor unit 50, and a cover 7.

[0016] The sensor unit 50 has a sensor board 52 on which an imaging element 51 such as a CCD sensor or a CMOS sensor is mounted, and a sensor plate 53 to which the sensor board 52 is fixed, and is fixed to the fixed barrel 6 with screws 8. In this way, the sensor unit 50 is held by the fixed barrel 6.

[0017] The lens unit 10 has a lens frame 20 as a holding member and a lens group 1 as an optical system incorporated into the lens frame. The lens group 1 is composed of lenses 1a, 1b, and 1c arranged in this order from the object side (front side) to the image side (rear side). The lens unit 10 also has a front pressing ring 30 that presses down on the frontmost lens 1a of the lens group 1 from the front side, and a rear pressing ring 40 that presses down on the rearmost lens 1b from the rear side.

[0018] A front male thread portion (first fixing screw portion) 20b is provided on the front portion of the outer periphery of the lens frame 20. A female thread portion (second fixing screw portion) 30a is provided on the inner periphery of the front retaining ring 30. By rotating the front retaining ring 30 around the optical axis relative to the lens frame 20 in which the lens 1a is incorporated, and threading the female thread portion 30a into the front male thread portion 20b and tightening it, the lens 1a can be pressed from the front to the rear against the lens frame 20 and fixed.

[0019] A rear male screw portion (first fixing screw portion) 20c is provided on the rear portion of the outer periphery of the lens frame 20. A female screw portion (second fixing screw portion) 40a is provided on the inner periphery of the rear pressing ring 40. rear side The retaining ring 40 is rotated around the optical axis relative to the lens frame 20 in which the lens 1c is incorporated, and the female screw part 40a is screwed into the rear male screw part 20c and tightened, whereby the lens 1c can be pressed from the rear side to the front side against the lens frame 20 and fixed.

[0020] A focus adjustment male screw portion (first adjustment screw portion) 20a is provided in the middle portion of the outer periphery of the lens frame 20, and a focus adjustment female screw portion (second adjustment screw portion) 6a is provided in the inner periphery of the fixed barrel 6. The lens frame 20 inserted into the fixed barrel 6 is rotated about the optical axis to thread the focus adjustment male screw portion 20a into the focus adjustment female screw portion 6a, thereby holding the lens unit 10 by the fixed barrel 6. Furthermore, when the lens unit 10 held by the fixed barrel 6 is rotated about the optical axis relative to the fixed barrel 6, the lens unit 10 can be moved in the optical axis direction relative to the fixed barrel 6. This allows adjustment of the position of the lens unit 10 relative to the fixed barrel 6, that is, adjustment of the focus of the lens unit 10.

[0021] After the focus adjustment has been performed in this manner, the sensor unit 50 is assembled and fixed to the fixed barrel 6 behind the lens unit 10, and the rear end opening of the fixed barrel 6 is then closed by the cover 7.

[0022] In the camera module 100, the subject image (optical image) formed by the lens unit 10 is photoelectrically converted (captured) by the imaging element 51.

[0023] 2 shows the disassembled camera module 100 as seen obliquely from the rear. A pair of engagement holes 40b that open toward the rear are formed in two locations on opposite sides of the optical axis O on the rear end surface (the end surface on the image side) of the rear retaining ring 40. By engaging these pair of engagement holes 40b with a tool (not shown) and rotating the rear retaining ring 40 around the optical axis relative to the lens frame 20, the female thread portion 40a of the rear retaining ring 40 can be tightened into the rear male thread portion 20c of the lens frame 20.

[0024] Additionally, tool engagement portions 20d as recesses are provided at a plurality of locations (eight locations in this example) at equal intervals in the circumferential direction of the rear end portion of the lens frame 20. The eight tool engagement portions 20d each include four pairs of tool engagement portions 20d located on opposite sides of the optical axis O.

[0025] Furthermore, the rear end surface of the rear retaining ring 40 is provided with a plurality of (four in this example) elongated holes 40c, each penetrating the rear retaining ring 40 in the optical axis direction and extending in an arc shape around the optical axis. In this example, the four elongated holes 40c are arranged at equal intervals in the circumferential direction. The four elongated holes 40c include two pairs of elongated holes 40c located on opposite sides of the optical axis O.

[0026] 5(a), when the rear press ring 40 is attached to the lens frame 20, the two pairs of elongated hole portions 40c and the two pairs of tool engagement portions 20d overlap in the optical axis direction. Therefore, the pairs of tool engagement portions 20d that overlap in the optical axis direction can be accessed through any pair of elongated hole portions 40c.

[0027] 3 shows a focus adjustment tool 90 used to adjust the focus of the camera module 100 of this embodiment. The focus adjustment tool 90 has a cylindrical grip portion 90b and a pair of engagement portions 90a provided as convex portions at two locations on opposite sides of the central axis C of the grip portion 90b at the front end of the tool. The pair of engagement portions 90a can engage with any of the four pairs of tool engagement portions 20d of the lens frame 20.

[0028] FIG. 4(a) shows a focus adjustment process using the focus adjustment tool 90 shown in FIG. 3. FIG. 4(b) shows an enlarged view of a portion of FIG. 4(a). The focus adjustment tool 90 is inserted from the rear end opening into the fixed barrel 6, which has the lens unit 10 installed but not the sensor unit 50 installed. The engagement portion 90a of the focus adjustment tool 90 passes through two of the four elongated hole portions 40c of the rear press ring 40 that are located on opposite sides of the optical axis O, and engages with a pair of tool engagement portions 20d. Tapered tool guide portions 40d are provided near the entrances of the elongated hole portions 40c, which guide the movement of the engagement portion 90a of the focus adjustment tool 90 toward the tool engagement portions 20d.

[0029] With the engagement portion 90a engaged with the tool engagement portion 20d, an operator holding the grip portion 90b of the focus adjustment tool 90 by hand rotates the focus adjustment tool 90 around the optical axis. This allows the lens unit 10 to be rotated relative to the fixed barrel 6 to adjust the focus without applying a rotational force directly to the rear press ring 40. At this time, the elongated hole portion 40c into which the engagement portion 90a is inserted has a circumferential length that does not interfere with the rotation of the engagement portion 90a, which rotates together with the lens unit 10, through a predetermined angle.

[0030] If a rotational force is applied directly to the rear retaining ring 40 during focus adjustment, the female thread portion 40a of the rear retaining ring 40 may be overtightened relative to the rear male thread portion 20c of the lens frame 20, or the female thread portion 40a may be loosened relative to the rear male thread portion 20c. Such overtightening or loosening may result in a deterioration in optical performance. In contrast, according to this embodiment, a rotational force can be applied to the lens unit 10 without applying a rotational force directly to the rear retaining ring 40.

[0031] 5(a) to 5(d) show the positional relationship between the elongated hole 40c and the tool engagement portion 20d when viewed from the image side. The lens frame 20, the lens group 1, and the rear presser ring 40 each have variations in precision as components. For this reason, the appropriate amount of screwing (screw engagement) of the rear presser ring 40 into the lens frame 20, that is, the rotational position of the rear presser ring 40 relative to the lens frame 20, differs for each individual lens unit 10. In this embodiment, to accommodate such individual differences in the rotational position of the rear presser ring 40 relative to the lens frame 20 for each lens unit 10, the elongated hole 40c and the tool engagement portion 20d are arranged to obtain the following positional relationship.

[0032] FIG. 5(a) shows the rear pressure ring 40 in a rotated position relative to the lens frame 20 where the line connecting the pair of engagement holes 40b of the rear pressure ring 40 (the dashed line in the figure) is horizontal. FIG. 5(b) shows the rear pressure ring 40 rotated 15° counterclockwise relative to the lens frame 20 from the state shown in FIG. 5(a) as viewed from the image side. FIG. 5(c) shows the rear pressure ring 40 rotated another 15° counterclockwise relative to the lens frame 20 from the state shown in FIG. 5(b). FIG. 5(d) shows the rear pressure ring 40 rotated another 15° counterclockwise relative to the lens frame 20 from the state shown in FIG. 5(c).

[0033] As can be seen from these figures, the two pairs of elongated hole portions 40c and the two pairs of tool engagement portions 20d overlap in the optical axis direction regardless of the rotational position of the rear press ring 40 relative to the lens frame 20. Therefore, the lens unit 10 can be rotated around the optical axis by engaging the engagement portions 90a of the focus adjustment tool 90 with the pair of tool engagement portions 20d that overlap with any pair of elongated hole portions 40c in the optical axis direction through the elongated hole portions 40c.

[0034] The relative positional relationship between the elongated hole portion 40c and the tool engagement portion 20d is the same in the states shown in Figures 5(a) and 5(c), and is the same in the states shown in Figures 5(b) and 5(d). Therefore, even if the appropriate amount of screwing of the rear press ring 40 into the lens frame 20 varies due to variations in part precision, the relative positional relationship between the elongated hole portion 40c and the tool engagement portion 20d will be close to one of the above two states. Therefore, the engagement portion 90a of the focus adjustment tool 90 can be engaged with the tool engagement portion 20d regardless of part precision.

[0035] According to this embodiment, focus adjustment can be performed by rotating the lens unit 10 around the optical axis relative to the fixed barrel 6 and moving it in the optical axis direction without affecting the tightening state of the rear pressure ring 40 relative to the lens frame 20. [Example]

[0036] 6 shows a cross section of a camera module 101 according to a second embodiment of the present invention. The basic configuration of the camera module 101 is the same as that of the camera module 100 according to the first embodiment, but the lens unit 11 is made up of a lens frame 21 incorporating the lens group 1, a front pressing ring 31, and a rear pressing ring 41.

[0037] A front male thread portion (first fixing screw portion) 21b is provided on the front portion of the outer periphery of the lens frame 21. A female thread portion (second fixing screw portion) 31a is provided on the inner periphery of the front retaining ring 31. By rotating the front retaining ring 31 around the optical axis with respect to the lens frame 21 in which the foremost lens 1a of the lens group 1 is incorporated, and threading the female thread portion 31a into the front male thread portion 21b and tightening it, the lens 1a can be pressed from the front to the rear against the lens frame 21 and fixed.

[0038] A rear male screw portion (first fixing screw portion) 21c is provided on the rear portion of the outer periphery of the lens frame 21. A female screw portion (second fixing screw portion) 41a is provided on the inner periphery of the rear pressing ring 41. rear side The retaining ring 41 is rotated around the optical axis relative to the lens frame 21 in which the rearmost lens 1c is incorporated, and the female screw part 41a is screwed into the rear male screw part 21c and tightened, whereby the lens 1c can be pressed from the rear side to the front side against the lens frame 21 and fixed.

[0039] A focus adjustment male thread portion 21a is provided in the middle portion of the outer periphery of the lens frame 21. The lens unit 11 is held by the fixed barrel 6 by rotating the lens frame 21 inserted into the fixed barrel 6 about the optical axis and threading the focus adjustment male thread portion 21a into the focus adjustment female thread portion 6a provided on the inner periphery of the fixed barrel 6. In this embodiment as well, by rotating the lens unit 11 held by the fixed barrel 6 about the optical axis relative to the fixed barrel 6, the lens unit 11 can be moved in the optical axis direction relative to the fixed barrel 6. This allows the focus of the lens unit 11 to be adjusted.

[0040] After the focus adjustment has been performed in this manner, the sensor unit 50 is assembled and fixed to the fixed barrel 6 behind the lens unit 11, and the rear end opening of the fixed barrel 6 is then closed by the cover 7.

[0041] 7 shows the disassembled camera module 101 as seen obliquely from the front. A pair of engagement holes 31b that open toward the front is formed in two locations on opposite sides of the optical axis O on the front end surface (the end surface toward the object) of the front retaining ring 31. By engaging these pair of engagement holes 31b with a tool (not shown) and rotating the front retaining ring 31 around the optical axis relative to the lens frame 21, the female thread portion 31a of the front retaining ring 31 can be tightened into the front male thread portion 21b of the lens frame 21.

[0042] Additionally, tool engagement portions 21d as convex portions are provided at six equally spaced locations in the circumferential direction of the front end portion of the lens frame 21. The six tool engagement portions 21d each include three pairs of tool engagement portions 21d located on opposite sides of the optical axis O.

[0043] Furthermore, four elongated holes 31c, each having an arc shape around the optical axis, penetrate the front pressing ring 31 in the optical axis direction and open on the front end surface of the front pressing ring 31. In this embodiment, the four elongated holes 31c are also arranged at equal intervals in the circumferential direction. The four elongated holes 31c include two pairs of elongated holes 31c located on opposite sides of the optical axis O.

[0044] 10(a), at least one pair of the three pairs of elongated hole portions 31c overlaps with at least one pair of the tool engagement portions 21d in the optical axis direction when the front press ring 31 is attached to the lens frame 21. Therefore, the pair of tool engagement portions 21d that overlaps with the at least one pair of elongated hole portions 31c in the optical axis direction can be accessed through the at least one pair of elongated hole portions 31c.

[0045] 8 shows a focus adjustment tool 91 used to adjust the focus of the camera module 101 of this embodiment. The focus adjustment tool 91 has a cylindrical grip portion 91c, arm portions 91b extending rearward from two locations on opposite sides of the central axis C of the grip portion 91c at its rear end, and a pair of engagement portions 91a provided as recesses at the tips of the arm portions 91b. The pair of engagement portions 91a can engage with any of the three pairs of tool engagement portions 21d of the lens frame 21.

[0046] 9(a) shows a focus adjustment process using the focus adjustment tool 91 shown in FIG. 8. FIG. 9(b) shows an enlarged view of a portion of FIG. 9(a). In this embodiment, the focus adjustment tool 91 is disposed on the front side of the lens unit 11. The engagement portion 91a of the focus adjustment tool 91 passes through two of the four elongated hole portions 31c of the front pressing ring 31 of the lens unit 11 incorporated into the fixed barrel 6, the two elongated hole portions 31c being located on opposite sides of the optical axis O, and engages with a pair of tool engagement portions 21d. Tapered tool guide portions 31d are provided near the entrances of the elongated hole portions 31c, and the movement of the engagement portion 91a of the focus adjustment tool 91 toward the tool engagement portions 21d is guided.

[0047] With the engagement portion 91a engaged with the tool engagement portion 21d, an operator holding the grip portion 91c of the focus adjustment tool 91 by hand rotates the focus adjustment tool 91 around the optical axis. This allows the lens unit 11 to be rotated relative to the fixed barrel 6 to adjust the focus without applying a rotational force directly to the front press ring 31. At this time, the elongated hole portion 31c into which the engagement portion 91a (arm portion 91b) is inserted has a circumferential length that does not interfere with the rotation of the engagement portion 91a, which rotates together with the lens unit 11, through a predetermined angle. According to this embodiment, a rotational force can be applied to the lens unit 11 without applying a rotational force directly to the front press ring 31.

[0048] In this embodiment, as in the first embodiment, the appropriate amount of screwing of the front press ring 31 into the lens frame 21 varies between individual lens units 11 due to variations in the part precision of the front press ring 31, the lens frame 21, and the lens group 1. For this reason, the elongated hole portion 31c and the tool engagement portion 21d are arranged so as to obtain the following positional relationship.

[0049] Fig. 10(a) shows a state in which the front pressure ring 31 is in a rotated position relative to the lens frame 21 such that the line connecting the pair of engagement holes 40b of the front pressure ring 31 (the dashed line in the figure) is horizontal. Fig. 10(b) shows a state in which the front pressure ring 31 has been rotated 15° counterclockwise relative to the lens frame 21 from the state in Fig. 10(a) as viewed from the image side. Fig. 10(c) shows a state in which the front pressure ring 31 has been rotated another 15° counterclockwise relative to the lens frame 21 from the state in Fig. 10(b). Fig. 10(d) shows a state in which the front pressure ring 31 has been rotated another 15° counterclockwise relative to the lens frame 21 from the state in Fig. 10(c).

[0050] As can be seen from these figures, at least one pair of elongated hole portions 31c and at least one pair of tool engagement portions 21d overlap in the optical axis direction regardless of the rotational position of the front press ring 31 relative to the lens frame 21. Therefore, the engagement portions 91a of the focus adjustment tool 91 can be engaged with the pair of tool engagement portions 21d through the pair of elongated hole portions 31c, thereby rotating the lens unit 11 around the optical axis.

[0051] In the states shown in Figures 10(a) and 10(c), one tool engagement portion 21d overlaps each of the two elongated hole portions 31c on opposite sides of the optical axis O. In the states shown in Figures 10(b) and 10(d), one tool engagement portion 21d overlaps each of the four elongated hole portions 31c. Therefore, even if the appropriate amount of screwing of the front press ring 31 into the lens frame 21 varies due to variations in part precision, the relative positional relationship between the elongated hole portions 31c and the tool engagement portions 21d will be close to one of the above two states. Therefore, the engagement portion 91a of the focus adjustment tool 91 can be engaged with the tool engagement portion 21d regardless of part precision.

[0052] According to this embodiment, focus adjustment can be performed by rotating the lens unit 11 around the optical axis relative to the fixed barrel 6 and moving it in the optical axis direction without affecting the tightening state of the front pressure ring 31 relative to the lens frame 21.

[0053] In this embodiment, the circumferential length of the elongated hole portion 31c can be made shorter than in Example 1. This makes it possible to prevent a decrease in the strength of the front pressing ring 31. Furthermore, since the number of tool engagement portions 21d is smaller than in Example 1, it is possible to reduce the complexity of the shape of the part.

[0054] The numbers of tool engagement portions 20d, 21d and elongated hole portions 40c, 31c described in the first and second embodiments are merely examples, and other numbers of engagement portions and elongated hole portions may be provided. Also, three elongated hole portions may be provided instead of four. Furthermore, in the case of a lens unit with almost no variation in part precision as described above, circular hole portions slightly larger than the tool engagement portions may be provided in the retaining ring instead of the elongated hole portions.

[0055] The embodiments described above are merely representative examples, and various modifications and alterations are possible to each embodiment when implementing the present invention. [Explanation of symbols]

[0056] 1 lens group 6 Fixed tube 10,11 Lens unit 20,21 Lens frame 20d,21d Tool engagement part 30,31 Front retaining ring 40,41 Rear retaining ring 31c,40c long hole part 90,91 Focus adjustment tool 100,101 Camera Module

Claims

1. A lens device capable of adjusting the position of a lens unit in an optical axis direction relative to a fixing member with which the lens unit is screwed by rotating the lens unit about the optical axis relative to the fixing member, the lens unit includes a holding member that holds a lens and is screwed to the fixing member, and a pressing member that is screwed to the holding member and presses the lens from a rear side relative to the holding member in the optical axis direction, the holding member has an engaging portion that can be engaged with a tool used to rotate the lens unit around the optical axis relative to the fixing member, the pressing member has a hole penetrating in the optical axis direction, The lens device is characterized in that the hole allows the tool to be engaged with the engaging portion through the hole.

2. the holding member has, as the engaging portion, a pair of engaging portions positioned on opposite sides of the optical axis, 2. The lens device according to claim 1, wherein the pressing member has a pair of hole portions positioned on opposite sides of the optical axis so as to overlap the pair of engagement portions in the optical axis direction.

3. the holding member has, as the engaging portion, a plurality of engaging portions arranged around the optical axis, the pressing member has, as the hole portion, a plurality of elongated hole portions formed so as to extend around the optical axis, 3. The lens device according to claim 1, wherein at least one of the plurality of engagement portions and at least one of the plurality of elongated hole portions overlap in the optical axis direction regardless of the amount of screwing of the pressing member into the holding member.

4. 4. The lens device according to claim 1, wherein the pressing member has a female thread portion that screws into a male thread portion provided on an outer periphery of the holding member.

5. A lens device according to any one of claims 1 to 4; an imaging element for capturing an object image formed by the lens;

6. A lens device capable of adjusting the position of a lens unit in an optical axis direction relative to a fixing member with which the lens unit is screwed by rotating the lens unit about the optical axis relative to the fixing member, the lens unit includes a holding member that holds a lens and is screwed to the fixing member, and a pressing member that is screwed to the holding member and presses the lens from a rear side relative to the holding member in the optical axis direction, the holding member has a pair of engaging portions located on opposite sides of the optical axis, The lens device is characterized in that the pressing member has a pair of hole portions that penetrate in the optical axis direction and are located on opposite sides of the optical axis so as to overlap with the pair of engagement portions in the optical axis direction.

Images