Lens apparatus and image pickup apparatus

Abstract

To suppress the falling of a movable lens barrel caused by an impact force from the outside.SOLUTION: The lens apparatus 100 includes a movable barrel 3 that holds a second lens, a fixed barrel 1 that holds the movable barrel so as to be linearly movable in a direction AD along an optical axis P, a feed screw member 2 that is provided in the fixed barrel and linearly moves the movable barrel, and an annular regulating member 5 that is provided in one of the fixed barrel and the movable barrel so as to be positionally adjustable in the direction along the optical axis and is capable of abutting on the other. Contact surfaces 5c, 5e, 5f, and 5g between the fixed barrel or the movable lens barrel and the restriction member are arranged so that an area defined by the contact surfaces in a plane orthogonal to the optical axis includes the center of gravity G of the movable lens barrel when viewed along the optical axis.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a lens device and an imaging device having a movable lens barrel that can move linearly in a direction along an optical axis relative to a fixed barrel. [Background technology]

[0002] Conventionally, there is a lens device in which a moving barrel is moved in the optical axis direction along a linear guide provided on a fixed barrel by a feed mechanism arranged on an axis different from the optical axis. In such a lens device, a restricting member is provided to restrict one end of the moving range of the moving barrel. When a part of the moving barrel abuts against the restricting member, the movement of the moving barrel in the optical axis direction is restricted.

[0003] However, if the lens device is dropped vertically with a portion of the movable barrel abutting against the regulating member and that portion of the movable barrel receives an impact force from the regulating member, the center of gravity of the movable barrel is far from the feed means, causing the movable barrel to tip over around the engagement portion with the feed means as a fulcrum, resulting in a deterioration in optical performance. To suppress the moment of force generated by the tilt of the movable barrel and mitigate the impact force, one configuration positions the abutment portion of the regulating member that abuts against a portion of the movable barrel at a position farther from the feed means than the center of gravity of the movable barrel. For example, Patent Document 1 discloses a structure in which multiple abutment surfaces of a buffer material that restricts the movement range of the movable barrel are arranged to surround the center of gravity of the movable barrel in a plane perpendicular to the optical axis.

[0004] On the other hand, the position of the regulating member is adjusted according to individual differences in the optical system and is fixed to the fixed barrel. Patent Document 2 discloses a structure in which a regulating member whose position can be adjusted in the optical axis direction is provided, and the position of the mechanical regulating end of the movement range of the movable lens barrel is adjusted. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-130624 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-183570 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional technology disclosed in Patent Document 1 does not include a means for adjusting the positions of the multiple contact surfaces of the buffer material in the optical axis direction, and the mechanism for fine-tuning the range of movement of the movable barrel becomes complicated and the adjustment operation becomes cumbersome. On the other hand, in a configuration with only one restricting member, as in the conventional technology disclosed in Patent Document 2, when an impact is received, the restricting member bears the impact force of more than half the product of the mass of the movable barrel and the impact value, which can lead to positional displacement of the restricting member or damage to the restricting member, resulting in a deterioration of optical performance.

[0007] Therefore, the present invention provides a lens device that allows adjustment of the position of a restricting member that restricts the range of movement of the movable lens barrel, and that can prevent the movable lens barrel from tipping over due to an external impact. [Means for solving the problem]

[0008] In order to achieve the above object, a lens device according to one embodiment of the present invention comprises: a moving lens barrel that holds an optical element; a fixed barrel that holds the movable barrel so that the movable barrel can move linearly in a direction along the optical axis; a feed means provided on the fixed barrel for moving the movable barrel in a straight line; a ring-shaped restricting member provided on either the fixed barrel or the movable barrel so as to be positionably adjustable in a direction along the optical axis and capable of coming into contact with the other; Equipped with The contact portion between the fixed barrel or the movable barrel and the regulating member is characterized in that, when viewed along the optical axis, the area defined by the contact portion in a plane perpendicular to the optical axis includes the center of gravity of the movable barrel. [Effects of the Invention]

[0009] According to the present invention, a lens barrel is provided that allows the position of a restricting member that restricts the range of movement of the movable barrel to be adjusted, and that can prevent the movable barrel from tipping over due to an external impact. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view of a lens structure taken in a plane containing the optical axis. [Figure 2] A cross-sectional view of the lens structure taken at a plane perpendicular to the optical axis, seen from the image plane side. [Figure 3] FIG. [Figure 4] 10 is a cross-sectional view of the lens structure in a state where the contact portion of the movable lens barrel is in contact with the contact surface of the regulating member. [Figure 5] FIG. 10 is an enlarged view of a fixing member fixed to a restricting member. [Figure 6] FIG. 10 is an explanatory diagram of the positional relationship between the four contact surfaces of the regulating member and the center of gravity of the movable lens barrel. [Figure 7] FIG. 10 is an explanatory diagram of the positional relationship between the three contact surfaces of the regulating member and the center of gravity of the moving barrel. [Figure 8] FIG. 10 is an explanatory diagram of the positional relationship between the five contact surfaces of the regulating member and the center of gravity of the moving barrel. [Figure 9] FIG. 10 is an explanatory diagram of the positional relationship between one annular contact surface of the regulating member and the center of gravity of the movable barrel. [Figure 10] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments will be described with reference to the accompanying drawings. (lens structure) FIG. 1 is a cross-sectional view of a lens structure 40 taken along a plane including the optical axis P. The lens structure 40 includes a fixed barrel 1, a feed screw member 2 as a feed means, a movable barrel 3, a fixed barrel 4, a regulating member 5, a first lens L1 as an optical element, and a second lens L2 as an optical element. The fixed barrel 4 holds the first lens L1. The movable barrel 3 holds the second lens L2. In the lens structure 40, the first lens L1 and the second lens L2 are arranged in this order from the object side OB to the image plane side IP. The fixed barrel 1 holds the movable barrel 3 so that it can only move linearly in an optical axis direction AD parallel to the optical axis P. The lens structure 40 is provided in a lens device 100 shown in FIG. 10, which will be described later. The fixed barrel 1 is fixed to the lens device 100.

[0012] A female thread portion 1f is provided on the inner circumference of the tip of the object side OB of the fixed barrel 1. The fixed barrel 4 is fixed to the fixed barrel 1 by threading a male thread portion 4c provided on the outer circumference of the fixed barrel 4 into the female thread portion 1f of the fixed barrel 1. The first lens L1 is fixed to the fixed barrel 4 by a lens holder 8. The second lens L2 is fixed to the movable barrel 3 by a lens holder 9.

[0013] (Feeding means) Next, the feed screw member 2 will be described as a feed means (moving means) for moving the movable barrel 3 relative to the fixed barrel 1 in the optical axis direction AD. FIG. 2 is a cross-sectional view of the lens structure 40 taken along a plane perpendicular to the optical axis P, as viewed from the image plane side IP. FIG. 3 is an exploded perspective view of the lens structure 40. The feed screw member 2 is disposed on the outside of the fixed barrel 1. The feed screw member 2 includes a male thread 2a and a female thread 2b that is threadedly engaged with the male thread 2a. The male thread 2a of the feed screw member 2 is allowed to rotate only around a feed screw axis O parallel to the optical axis P and is held by the fixed barrel 1 so as not to move in the optical axis direction AD. The female thread 2b is fixed to the outer periphery of the movable barrel 3. The male thread 2a can be rotated manually or by an electric drive means such as a motor. As shown in FIG. 1, the feed screw member 2 is disposed on the outside of the movable barrel 3.

[0014] (Guidance means) Next, a guide means will be described that guides the movable barrel 3 so that it can only move linearly in the optical axis direction AD relative to the fixed barrel 1. The guide means includes roller units 1a, 1b, 1c, and 1d provided on the fixed barrel 1 and guide groove members 3a, 3b, 3c, and 3d provided on the movable barrel 3. Four linear grooves 1g extending in the optical axis direction AD are arranged at approximately equal intervals on the inner peripheral portion of the fixed barrel 1. Roller units 1a, 1b, 1c, and 1d are respectively provided in the four linear grooves 1g. Each of the roller units 1a, 1b, 1c, and 1d includes a plurality of roller members (four in this embodiment). Four guide groove members 3a, 3b, 3c, and 3d extending in the optical axis direction AD are arranged at approximately equal intervals on the outer peripheral portion of the movable barrel 3. The movable barrel 3 is disposed inside the fixed barrel 1, and the roller units 1a, 1b, 1c, and 1d of the fixed barrel 1 abut against the guide groove members 3a, 3b, 3c, and 3d of the movable barrel 3, respectively. In this way, the movable barrel 3 is guided in the optical axis direction AD by the roller units 1a, 1b, 1c, and 1d and the guide groove members 3a, 3b, 3c, and 3d. The position of the movable barrel 3 in the optical axis direction AD can be adjusted with high precision in accordance with the rotation angle of the male screw 2a. In this way, the movable barrel 3 is held inside the fixed barrel 1 so that it can move linearly.

[0015] (Regulating member) Next, we will explain the regulating member 5, which serves as a stopper for regulating one end of the movement range of the movable barrel 3 relative to the fixed barrel 1. The regulating member 5 is formed in an annular shape. A female thread 5a is provided on the inner periphery of the regulating member 5. A male thread 4a is provided on the outer periphery of the fixed barrel 4. The female thread 5a of the regulating member 5 is threadedly engaged with the male thread 4a of the fixed barrel 4 to hold the regulating member 5 to the fixed barrel 4. As shown in FIG. 3 , four protrusions 5d are arranged at approximately equal intervals on the image plane side IP of the regulating member 5. An abutment surface 5c is provided on the image plane side IP of each of the protrusions 5d. The position of the abutment surface 5c in the optical axis direction AD can be adjusted by rotating the regulating member 5, which is held by the fixed barrel 4 with the female thread 5a of the regulating member 5 threadedly engaged with the male thread 4a of the fixed barrel 4, relative to the fixed barrel 4.

[0016] An annular contact portion 3e is provided at the end of the movable barrel 3 on the side where the regulating member 5 is located (the object side OB). The annular contact portion 3e has a flange shape that protrudes radially outward from the end of the movable barrel 3. The annular contact portion 3e is arranged to surround the center of gravity G (FIG. 6) of the movable barrel 3 in a plane perpendicular to the optical axis P. FIG. 4 is a cross-sectional view of the lens structure 40 in a state where the contact portion 3e of the movable barrel 3 is in contact with the contact surface 5c of the regulating member 5. When the movable barrel 3 is at one end (the end on the object side OB) of its range of movement, as shown in FIG. 4, the annular contact portion 3e provided on the movable barrel 3 comes into contact with the contact surface 5c of the regulating member 5, restricting movement of the movable barrel 3 in the optical axis direction AD.

[0017] (fixing member) Next, the fixed member 6 that restricts the rotation of the restricting member 5 relative to the fixed barrel 4 will be described. FIG. 5 is an enlarged view of the fixed member 6 secured to the restricting member 5. The fixed member 6 can be secured to the restricting member 5 with screws 7. The restricting member 5, which is threadably engaged with the fixed barrel 4, is rotated relative to the fixed barrel 4 to adjust the position of the abutment surface 5c of the restricting member 5 in the optical axis direction AD, and then the fixed member 6 is secured to the restricting member 5. As shown in FIG. 5, a recess (engagement portion) 4b is provided at the end of the fixed barrel 4 on the image plane side IP in the optical axis direction AD. The recess 4b has a gap S with a protrusion 6a provided on the fixed member 6 in the optical axis direction AD, and engages with the protrusion 6a in the circumferential direction. The recess 4b has a gap S with the protrusion 6a of the fixed member 6 in the optical axis direction AD, and there is also a gap S between the fixed barrel 4 and the fixed member 6 in the optical axis direction AD. Therefore, the fixed member 6 does not restrict the restricting member 5 in the optical axis direction AD.

[0018] The restricting member 5 has a plurality of screw holes 5b arranged around the entire outer periphery. The fixed member 6 has an elongated hole 6b. The fixed member 6 is fixed to the restricting member 5 by inserting a plurality of screws 7 into the elongated holes 6b of the fixed member 6 and threading the plurality of screws 7 into the plurality of screw holes 5b. Because the convex portion 6a of the fixed member 6 engages with the concave portion 4b of the fixed lens barrel 4, when the fixed member 6 is fixed to the restricting member 5, rotation of the restricting member 5 relative to the fixed lens barrel 4 is restricted. The fixed member 6 can fix the restricting member 5 at any phase relative to the fixed lens barrel 4. The fixed member 6 fixes the position of the abutment surface 5c of the restricting member 5 in the optical axis direction AD.

[0019] By adjusting the fixed position of the fixed member 6 relative to the regulating member 5, the regulating member 5 can be fixed at any phase around the optical axis P relative to the fixed barrel 4. An operation window 1e is provided in the fixed barrel 1 to enable rotational adjustment of the regulating member 5 and fixing and releasing of the fixed member 6 from outside the fixed barrel 1. Phase adjustment by rotation of the regulating member 5 and fixing of the fixed member 6 are performed from outside the fixed barrel 1 using a tool or screwdriver through the operation window 1e provided in the fixed barrel 1. By making it possible to adjust the phase of the regulating member 5 and fix the fixed member 6 from outside the fixed barrel 1, it becomes easy to fine-tune the movement range of the movable barrel 3 in accordance with individual differences in the optical system, and the assembly of the lens device 100 is also improved.

[0020] (Positional relationship between the contact surface of the regulating member and the center of gravity of the moving lens barrel) FIG. 6 is an explanatory diagram of the positional relationship between the four contact surfaces 5c of the regulating member 5 and the center of gravity G of the movable barrel 3. FIG. 6 is a cross-sectional view of the lens structure 40 taken along a plane perpendicular to the optical axis P, including the four contact surfaces 5c of the regulating member 5, as viewed from the image plane side IP. The four contact surfaces 5c are arranged at approximately equal intervals on the annular regulating member 5. When the movable barrel 3 is at one end of its range of movement (the end on the object side OB), as shown in FIG. 4, the contact surfaces 5c (contact portions) of the regulating member 5 come into contact with the contact portions 3e of the movable barrel 3, restricting the movement of the movable barrel 3 in the optical axis direction AD. At this time, the contact surfaces 5c, which are the multiple contact portions between the movable barrel 3 and the regulating member 5, are arranged so that the area defined by the contact surfaces 5c includes the center of gravity G of the movable barrel 3. That is, as shown in Figure 6, the area formed by connecting four abutment surfaces 5c spaced apart in the circumferential direction of the annular regulating member 5 (the area shown by the mesh line in Figure 6) includes the center of gravity G of the movable lens barrel 3 when viewed from the image plane side IP.

[0021] Here, as shown in FIG. 4, if the lens device 100 receives an external impact force in the optical axis direction AD while the abutment surface 5c is in contact with the abutment portion 3e, the impact force generated by the inertia of the movable barrel 3 is distributed to the mating portion between the male thread 2a and the female thread 2b and the abutment portion 3e and acts approximately simultaneously. This prevents the movable barrel 3 from tipping over. The regulating member 5, which contacts the abutment portion 3e, bears most of the impact force generated by the inertia of the movable barrel 3. However, the impact force acting on the regulating member 5 is absorbed by the entire circumference of the mating portion between the large-diameter female thread portion 5a of the regulating member 5 and the male thread portion 4a of the fixed barrel 4, and is therefore mitigated. Furthermore, because the recessed portion 4b provided on the fixed barrel 4 and the protruding portion 6a provided on the fixed member 6 are spaced apart in the optical axis direction AD, the fixed member 6 is hardly affected by the impact force, and displacement of the fixed member 6 does not occur. In other words, by providing the lens device 100 with the regulating member 5 and the fixing member 6, damage to the high-precision guide mechanism and feed mechanism can be avoided even when the lens device 100 is subjected to an impact force, such as being dropped in the optical axis direction AD, while the movable lens barrel 3 is at one end of its range of movement.

[0022] In the embodiment, the regulating member 5 is provided so as to be screwed onto the fixed barrel 4, and the regulating member 5 is abutted against the movable barrel 3, but the same effect can be obtained by providing the regulating member 5 so as to be screwed onto the movable barrel 3, and abutting the regulating member 5 against the fixed barrel 4. Regarding the screw-engaging portion of the regulating member 5, a male thread portion may be provided on the outer periphery of the regulating member 5, and the male thread portion of the regulating member 5 may be screwed into a female thread portion provided on the inner periphery of the fixed barrel 4.

[0023] The contact portion 3e provided on the movable lens barrel 3 in this embodiment has an annular shape, but may have a discontinuous shape with a notch provided midway as long as it can contact the restricting member 5. Furthermore, the contact portion 3e may be a plurality of contact portions provided at intervals.

[0024] In this embodiment, the regulating member 5 has four abutment surfaces 5c, but the number of abutment surfaces 5c is not limited to four. The number of abutment surfaces 5c may be three or more. The area connecting the contact portions between the abutment surfaces 5c and the abutment portion 3e may include the center of gravity G of the movable barrel 3. When the number of abutment surfaces 5c is two, the area defined by the contact portions between the abutment surfaces 5c and the abutment portion 3e is a straight line. In this case, the expression "the area defined by the contact portions includes the center of gravity of the movable barrel" means that the center of gravity G of the movable barrel 3 is located on the straight line connecting the two contact portions.

[0025] In this embodiment, the four contact surfaces 5c are arranged at approximately equal intervals on the annular regulating member 5. However, even if multiple contact surfaces (contact portions) are arranged unevenly around the optical axis P, the same effect as this embodiment can be achieved as long as the center of gravity G of the movable barrel 3 is included in a polygon connecting the multiple contact surfaces when viewed in the optical axis direction AD. Furthermore, even if annular contact surfaces (contact portions) are provided on a single member, the same effect as this embodiment can be achieved as long as the area defined by the annular contact surfaces includes the center of gravity G of the movable barrel 3 when viewed in the optical axis direction AD.

[0026] FIG. 7 illustrates a case where three contact surfaces 5e are arranged at unequal intervals on the regulating member 5. FIG. 7 is an explanatory diagram of the positional relationship between the three contact surfaces 5e of the regulating member 5 and the center of gravity G of the movable barrel 3. FIG. 7 is a cross-sectional view of the lens structure 40 taken along a plane perpendicular to the optical axis P, including the three contact surfaces 5e of the regulating member 5, as viewed from the image plane side IP. The three contact surfaces 5e are arranged at unequal intervals on the annular regulating member 5. The contact surfaces 5e, which are multiple contact portions between the movable barrel 3 and the regulating member 5, are arranged so that the area defined by the contact surfaces 5e includes the center of gravity G of the movable barrel 3. In other words, the area formed by connecting the three spaced-apart contact surfaces 5e (the area indicated by the cross-hatched lines in FIG. 7) includes the center of gravity G of the movable barrel 3 when viewed from the image plane side IP. With this arrangement, even if an external impact force is applied to the lens device 100 in the optical axis direction AD with the abutment surface 5e in contact with the abutment portion 3e, the movable barrel 3 can be prevented from falling.

[0027] FIG. 8 will be used to explain a case where five contact surfaces 5f are arranged at unequal intervals on the regulating member 5. FIG. 8 is an explanatory diagram of the positional relationship between the five contact surfaces 5f of the regulating member 5 and the center of gravity G of the movable barrel 3. FIG. 8 is a cross-sectional view of the lens structure 40 taken along a plane perpendicular to the optical axis P, including the five contact surfaces 5f of the regulating member 5, as viewed from the image plane side IP. The five contact surfaces 5f are arranged at unequal intervals on the annular regulating member 5. The contact surfaces 5f, which are multiple contact portions between the movable barrel 3 and the regulating member 5, are arranged so that the area defined by the contact surfaces 5f includes the center of gravity G of the movable barrel 3. In other words, the area formed by connecting the five spaced-apart contact surfaces 5f (the area shown by the cross-hatched lines in FIG. 8) includes the center of gravity G of the movable barrel 3 when viewed from the image plane side IP. With this arrangement, even if an external impact force is applied to the lens device 100 in the optical axis direction AD with the abutment surface 5f in contact with the abutment portion 3e, the movable barrel 3 can be prevented from falling.

[0028] FIG. 9 will be used to explain the case where one annular abutment surface 5g is arranged on the regulating member 5. FIG. 9 is an explanatory diagram of the positional relationship between the one annular abutment surface 5g of the regulating member 5 and the center of gravity G of the movable barrel 3. FIG. 9 is a cross-sectional view of the lens structure 40 taken along a plane perpendicular to the optical axis P, including the one annular abutment surface 5g of the regulating member 5, as viewed from the image plane side IP. The one annular abutment surface 5g is arranged on the regulating member 5, which is a single annular member. The abutment surface 5g, which is the annular contact portion between the movable barrel 3 and the regulating member 5, is arranged so that the area defined by the abutment surface 5g includes the center of gravity G of the movable barrel 3. In other words, the area surrounded by the one annular abutment surface 5g (the area indicated by the cross-hatched line in FIG. 9) includes the center of gravity G of the movable barrel 3 when viewed from the image plane side IP. With this arrangement, even if an external impact force is applied to the lens device 100 in the optical axis direction AD with the contact surface 5g in contact with the contact portion 3e, the movable barrel 3 can be prevented from falling.

[0029] As described above, the contact portion between the movable barrel 3 and the regulating member 5 is positioned so that, when viewed in the optical axis direction AD, the area defined by the contact portion in a plane perpendicular to the optical axis P includes the center of gravity G of the movable barrel 3. This prevents the movable barrel 3 from tipping over even when an external impact force in the optical axis direction AD is applied to the lens device 100 while the abutment surface 5c, 5e, 5f, or 5g of the regulating member 5 is in contact with the abutment portion 3e of the movable barrel 3. This prevents a deterioration in optical performance due to an external impact force. In addition, the fixed member 6, which restricts the rotation of the regulating member 5 relative to the fixed barrel 4, is fixed to the regulating member 5 at any rotational position of the regulating member 5. The fixed barrel 1 is provided with an operation window 1e that allows the rotational position of the regulating member 5 to be adjusted from the outside and the fixed member 6 to be fixed. This makes it possible to adjust the position of the optical axis direction AD of the regulating member 5, which regulates one end of the movement range of the movable lens barrel 3, using a simple mechanism, thereby preventing the movable lens barrel 3 from falling due to impact forces from outside the lens device 100, and providing a lens device 100 with high impact resistance.

[0030] The feed means in this embodiment is a feed screw member 2, but the feed means may also be a linear drive means such as a VCM or an ultrasonic motor. The feed screw member 2 in this embodiment can be replaced with a cam member. The shape of the fixed barrel 4 as a buffer member, the shape of the regulating member 5, the shape of the convex portion 5d on which the abutment surfaces 5c, 5e, 5f, or 5g are formed, and the concave and convex shapes of the guide groove members 3a, 3b, 3c, and 3d as guide members can be freely set within a range that does not complicate the mechanism.

[0031] In this embodiment, the regulating member 5 is held by the fixed barrel 4 so that its position is adjustable in the optical axis direction AD, and is capable of abutting against the movable barrel 3, but this is not limited to this. The regulating member 5 may also be held by the movable barrel 3 so that its position is adjustable in the optical axis direction AD, and be capable of abutting against the fixed barrel 1 or the fixed barrel 4 held by the fixed barrel 1. In other words, the annular regulating member 5 may be provided on either the fixed barrel 1 or the movable barrel 3 so that its position is adjustable in the optical axis direction AD, and be capable of abutting against the other. The annular regulating member 5 may have a diameter larger than the outer diameter of the main body portion of the movable barrel 3 excluding the abutment portion 3e. This is because the larger the diameter of the regulating member 5, the easier it is to disperse impact forces.

[0032] (imaging device) An imaging device 400 including the lens device 100 of this embodiment will be described below. FIG. 10 is a diagram showing the imaging device 400. The imaging device 400 includes a camera body 200 and a lens device 100 detachably attached to the camera body 200. The lens device 100 incorporates a lens structure 40 having a fixed barrel 1 as part of its optical system. The lens device 100 is connected to the camera body 200 with its optical axis P aligned, and is held by a supporter (holding member) 300. The camera body 200 includes an imaging element 200a that receives an image formed by the lens device 100, and a control unit 200b that generates image data based on an electrical signal from the imaging element 200a. The image formed by the lens device 100 is focused on the imaging element 200a. The imaging element 200a is a solid-state imaging element (photoelectric conversion element) such as a CCD sensor or CMOS sensor that converts received light into an electrical signal. The control unit 200b has a CPU and controls the operation of each unit of the imaging device 400.

[0033] The camera body 200 of this embodiment incorporates an image sensor 200a, and the lens apparatus 100 is detachably attached thereto, but is not limited to this. The image sensor 400 may be configured such that the camera body 200 incorporating the image sensor 200a and the lens apparatus 100 are integrated together. The lens apparatus 100 of this embodiment is applicable to various image sensor devices, such as mirrorless cameras and broadcast cameras.

[0034] According to this embodiment, it is possible to adjust the position of the restricting member 5 that restricts one end of the movement range of the movable lens barrel 3, and it is also possible to prevent the movable lens barrel 3 from falling due to an impact force from outside the lens device 100. This makes it possible to prevent a deterioration in optical performance.

[0035] (Configuration 1) A lens device comprising: a movable barrel that holds an optical element; a fixed barrel that holds the movable barrel so that it can move linearly in a direction along the optical axis; a feed means provided on the fixed barrel for moving the movable barrel linearly; and a circular regulating member provided on either the fixed barrel or the movable barrel so that its position can be adjusted in a direction along the optical axis and that can abut against the other, wherein the contact portion between the fixed barrel or the movable barrel and the regulating member is positioned so that, when viewed along the optical axis, the area defined by the contact portion in a plane perpendicular to the optical axis includes the center of gravity of the movable barrel. (Configuration 2) A lens device according to configuration 1, characterized in that the contact portion includes a plurality of abutment surfaces spaced apart in the circumferential direction, and the region is an area formed by connecting the plurality of abutment surfaces. (Configuration 3) The lens device according to configuration 1, wherein the contact portion is an annular abutment surface, and the region is an area surrounded by the annular abutment surface. (Configuration 4) A lens device according to any one of configurations 1 to 3, characterized in that the regulating member is screwed onto one of the fixed barrel or the movable barrel, and the position of the regulating member in the direction along the optical axis can be adjusted by rotating the regulating member. (Configuration 5) A lens device according to any one of configurations 1 to 4, further comprising a fixed member that can be fixed to the regulating member, and wherein one of the fixed barrel or the movable barrel is provided with an engagement portion that engages with the fixed member in the circumferential direction to fix the regulating member at any phase relative to the one of the fixed barrel or the movable barrel. (Configuration 6) The lens device described in Configuration 5, characterized in that a gap is provided between the engagement portion and the fixing member in the direction along the optical axis so that the fixing member does not restrict the regulating member in the direction along the optical axis. (Configuration 7) The lens device according to configuration 5 or 6, wherein the fixed barrel is provided with an operation window through which the rotational adjustment of the regulating member and the fixing and release of the fixing member can be operated from outside the fixed barrel. (Configuration 8) The lens device according to any one of configurations 1 to 7, wherein the feeding means is disposed outside the moving lens barrel. (Configuration 9) The lens device according to any one of configurations 1 to 8, wherein the restricting member has a diameter larger than that of the movable lens barrel. (Configuration 10) An imaging device comprising: the lens device according to any one of configurations 1 to 9; and an imaging element that receives an image formed by the lens device. [Explanation of symbols]

[0036] 1...Fixed cylinder 2. Feed screw member 3. Moving telescope 5. Regulating member 5c, 5e, 5f, 5g...Contact surface 100 Lens Device AD・Optical axis direction G...center of gravity L2: Second lens P...Optical axis

Claims

1. a moving lens barrel that holds an optical element; a fixed barrel that holds the movable barrel so that the movable barrel can move linearly in a direction along the optical axis; a feed means provided on the fixed barrel for moving the movable barrel in a straight line; a ring-shaped restricting member provided on either the fixed barrel or the movable barrel so as to be positionably adjustable in a direction along the optical axis and capable of coming into contact with the other; Equipped with A lens device characterized in that the contact portion between the fixed barrel or the movable barrel and the regulating member is arranged so that, when viewed along the optical axis, the area defined by the contact portion in a plane perpendicular to the optical axis includes the center of gravity of the movable barrel.

2. the contact portion includes a plurality of abutment surfaces spaced apart in the circumferential direction, 2. The lens device according to claim 1, wherein the area is an area formed by connecting the plurality of contact surfaces.

3. the contact portion is an annular abutment surface, 2. The lens device according to claim 1, wherein the area is an area surrounded by the annular contact surface.

4. 2. The lens device according to claim 1, wherein the regulating member is threadedly engaged with one of the fixed barrel and the movable barrel, and the position of the regulating member in the direction along the optical axis can be adjusted by rotating the regulating member.

5. Further, a fixing member that can be fixed to the restricting member is provided, 2. The lens device according to claim 1, wherein one of the fixed barrel and the movable barrel is provided with an engagement portion that engages with the fixed member in a circumferential direction to fix the regulating member at any phase relative to the one of the fixed barrel and the movable barrel.

6. 6. The lens device according to claim 5, wherein a gap is provided between the engagement portion and the fixed member in the direction along the optical axis so that the fixed member does not restrict the regulating member in the direction along the optical axis.

7. 6. The lens device according to claim 5, wherein the fixed barrel is provided with an operation window through which rotational adjustment of the regulating member and fixing and releasing of the fixing member can be performed from outside the fixed barrel.

8. 2. The lens device according to claim 1, wherein the feed means is disposed outside the movable lens barrel.

9. 2. The lens device according to claim 1, wherein the restricting member has a diameter larger than that of the movable lens barrel.

10. A lens device according to any one of claims 1 to 9; an imaging element that receives an image formed by the lens device; An imaging device comprising:

Images