Lens barrel and imaging device

Abstract

Provided is a lens barrel and an imaging device that can be made compact. The lens barrel includes: a moving barrel that moves along an optical axis by changing a focal distance; a first driving section provided to the moving barrel; a first lens that relatively moves along the optical axis with respect to the moving barrel by the first driving section; a second driving section provided to the moving barrel; and a second lens that relatively moves along the optical axis with respect to the moving barrel by the first driving section and is disposed on an image surface side compared to the first lens, and a movement amount of the second lens with respect to the moving barrel when the focal distance is changed to a second focal distance in a first state in which the second lens is disposed on the image surface side most in a first focal distance is smaller than a movement amount of the second lens with respect to the moving barrel when the focal distance is changed to the second focal distance in a second state in which the second lens is disposed on an object side compared to the first state in the first focal distance.

Description

[0001] This invention application is a divisional application of the invention application with an international filing date of December 18, 2019, international application number PCT / JP2019 / 049636, national application number 201980092316.9 which entered the Chinese national phase, and the invention title "Lens barrel and camera device". Technical Field

[0002] This invention relates to a lens barrel and a camera device. Background Technology

[0003] Previously, various solutions have been provided that incorporate a focusing lens and drive the focusing lens with a motor (see, for example, Patent Document 1). Furthermore, there is a desire to further miniaturize the lens barrel.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: JP 2015-49334 Summary of the Invention

[0007] The lens barrel in the first aspect comprises: a movable barrel that moves along the optical axis by changing the focal distance; a first drive unit provided by the movable barrel; a first lens that moves relative to the movable barrel along the optical axis by the first drive unit; a second drive unit provided by the movable barrel; and a second lens that moves relative to the movable barrel along the optical axis by the second drive unit. The amount of movement of the first lens relative to the movable barrel when the focal distance is changed to a second focal distance in a first state where the first lens is positioned closest to the subject with the first focal distance is smaller than the amount of movement of the first lens relative to the movable barrel in a second state where the first lens is positioned closer to the image plane than in the first state.

[0008] The second aspect comprises a lens barrel comprising: a movable barrel that moves along the optical axis by changing the focal distance; a first drive unit provided by the movable barrel; a first lens that moves relative to the movable barrel along the optical axis by the first drive unit; a second drive unit provided by the movable barrel; and a second lens that moves relative to the movable barrel along the optical axis by the second drive unit, wherein when the focal distance is changed to a second focal distance in a first state in which the first lens is positioned closest to the subject at the first focal distance, the amount of movement of the first lens relative to the movable barrel is smaller than the amount of movement of the second lens relative to the movable barrel when the focal distance is changed to the second focal distance in the first state.

[0009] The lens barrel in the third aspect is configured to include: a movable barrel that moves along the optical axis by changing the focal distance; a first drive unit provided by the movable barrel; a first lens that moves relative to the movable barrel along the optical axis by the first drive unit; a second drive unit provided by the movable barrel; and a second lens that moves relative to the movable barrel along the optical axis by the second drive unit, wherein the amount of movement of the first lens disposed on the subject side when the focal distance is changed is smaller than the amount of movement of the second lens disposed on the subject side when the focal distance is changed.

[0010] The fourth aspect of the camera device is configured to include the aforementioned lens barrel. Attached Figure Description

[0011] Figure 1 This is a conceptual diagram of a camera 1 constructed by mounting a lens barrel 2 onto a camera body 3 according to an embodiment.

[0012] Figure 2 This is a perspective view of the inner cam cylinder 83 of the lens barrel 2 and the cylinder component disposed on its inner diameter side.

[0013] Figure 3 From Figure 2 Remove the inner cam cylinder 83 and from the... Figure 2 A stereoscopic view viewed from the opposite side.

[0014] Figure 4 It is from Figure 3 The diagram shows only the drive mechanism of the 5 sets of boxes 50 with the motor moving cylinder 100 removed.

[0015] Figure 5 This diagram illustrates the movement of the 5-group lens L5 and the 6-group lens L6. (a) shows the zoom position at the wide-angle end, and (b) shows the zoom position at the telephoto end.

[0016] Figure 6 This diagram illustrates the movement of the 5-group lens L5, the 6-group lens L6, and the movement of the motor moving cylinder 100 when the focal distance is changed from the wide-angle end (W) to the telephoto end (T).

[0017] The annotations in the attached figures are explained as follows:

[0018] OA: Optical axis; 2: Lens barrel; 3: Camera body; 5M: 5-group drive unit.

[0019] 50: 5-group frame, 51: 5-group holding part, 6M: 6-group drive part, 60: 6-group frame, 81: zoom ring, 82: outer cam cylinder, 83: inner cam cylinder, 84: outer fixed cylinder, 85: inner fixed cylinder, 86: focusing ring, 90: control part, 92: cam follower, 100: motor moving cylinder, 101: cam pin, 103: front wall part, 151: main guide rod, 152: secondary guide rod, 161: main guide rod, 162: secondary guide rod, 170: guide rod pressing member, 501: unit frame, 502: guide screw, 503: moving guide rail, 511: main guide rod engaging part, 511a: front wall, 511b: rear wall, 511c: light shielding part, 511d: side wall, 511e: guide rod insertion hole, 512: secondary guide rod engaging part. Detailed Implementation

[0020] Figure 1 This is a conceptual diagram of a camera 1, which is configured as an imaging device by mounting a lens barrel 2 to a camera body 3 according to an embodiment. Furthermore, in the following description, the subject side of the lens barrel 2 along the optical axis OA is designated as the front side, and the camera body 3 side is designated as the rear side. Movement of the lens barrel 2 along the optical axis OA is referred to as "straight-in," and rotation around the optical axis OA is referred to as "rotation." Moreover, in the radial direction orthogonal to the optical axis OA of the lens barrel 2, the side separated from the optical axis OA is referred to as the outer diameter side, and the side closer to the optical axis OA is referred to as the inner diameter side.

[0021] The camera 1 includes a camera body 3 and a lens barrel 2. The lens barrel 2 is mounted on the camera body 3 by means of a lens mounting part LM at the rear (base end) that engages with the body mounting part BM of the camera body 3.

[0022] The camera body 3 is a so-called digital camera that has an image sensor 4 that converts optical imaging into electrical signals, performs image processing on the image data based on the image sensor 4 and records it to a recording unit (not shown) or displays it on a display unit (not shown).

[0023] Furthermore, as a camera, it can be an SLR camera, a mirrorless camera, a compact digital camera, or even a twin-lens reflex camera. It can also be a camera built into a smartphone or tablet.

[0024] A power switch (not shown) is provided on the camera body 3. The ON / OFF signal of the power switch and the signal indicating the focus or aperture value are sent to the control unit 90 of the lens barrel 2, which will be described later.

[0025] The lens barrel 2 is a so-called zoom lens that has a group of lenses L1, L2, L3, L4, L5, L6 and L7 from the front side, and is capable of changing the focal distance.

[0026] Lens group 1 (L1), lens group 2 (L2), lens group 3 (L3), lens group 4 (L4), lens group 5 (L5), lens group 6 (L6), and lens group 7 (L7) move along the optical axis OA during zooming.

[0027] Lens group L5 (group 5) and lens group L6 (group 6) are focusing lens groups that move within the motor moving cylinder 100 (described later) during focusing. The lens cylinder 2 of this embodiment has two focusing lens groups. Therefore, the weight of each focusing lens group can be reduced, allowing even actuators with very low driving force, such as stepper motors, to operate. Furthermore, focusing performance can be improved.

[0028] Lens group L1 is held in frame group 10, and sliding cylinder 12 extends rearward from frame group 10. Lens group L2 is held in frame group 20. Lens group L3 is held in frame group 30. An aperture unit 32 is mounted in front of frame group 30. Lens group L4 is held in frame group 40, lens group L5 is held in frame group 50, lens group L6 is held in frame group 60, and lens group L7 is held in frame group 70.

[0029] The lens barrel 2 has an outer fixed barrel 84 and an inner fixed barrel 85. The zoom ring 81 and the focusing ring 86 are rotatably disposed on the outer periphery of the outer fixed barrel 84. From the outer fixed barrel 84 toward the inner diameter side, a set of sliding barrel 12, outer cam barrel 82, inner fixed barrel 85, inner cam barrel 83 and motor moving barrel 100 are arranged in sequence.

[0030] A connecting pin (not shown) extends from the zoom ring 81 toward the inner diameter side. The connecting pin passes through the circumferential groove (not shown) of the outer fixed cylinder 84 and is connected to the outer cam cylinder 82. If the zoom ring 81 is rotated circumferentially, the connecting pin also rotates circumferentially, and the outer cam cylinder 82 rotates together with the zoom ring 81.

[0031] Figure 2 This is a perspective view of the inner cam cylinder 83 of the lens barrel 2 and the multiple cylinder components arranged on its inner diameter side. The 5-group lens L5 and the 6-group lens L6 are not shown. The inner cam cylinder 83 has a cam follower 92 on its outer diameter side. The cam follower 92 passes through a cam drive cam groove (not shown) provided in the inner fixed cylinder 85 and is inserted into a straight-in groove (not shown) provided in the outer cam cylinder 82. If the outer cam cylinder 82 rotates in the circumferential direction, the cam follower 92 rotates in the circumferential direction and moves straight in, and the inner cam cylinder 83 rotates and moves straight in.

[0032] Additionally, the inner cam cylinder 83 is provided with a cam groove 83a for driving the motor moving cylinder 100. Furthermore, the groove for driving the motor moving cylinder 100 provided in the inner cam cylinder 83 is not limited to a circumferential groove, and can be a circumferential groove or a straight groove.

[0033] Figure 3From Figure 2 Remove the inner cam cylinder 83 and from the... Figure 2 A perspective view of the subject from the opposite side. The cam pin 101 extends from the motor moving cylinder 100 toward the outer diameter side. The cam pin 101 engages with the cam groove 83a provided in the inner cam cylinder 83 and the straight groove (not shown) of the inner fixed cylinder 85.

[0034] If the zoom ring 81 rotates, the inner cam cylinder 83 rotates and moves straight ahead. The motor moving cylinder 100 moves in a straight-ahead direction in a non-rotating manner, corresponding to the straight-ahead component of the movement of the inner cam cylinder 83, through the cam pin 101. Along with this, the 5-group lens L5 and the 6-group lens L6 move straight ahead.

[0035] The front wall 103 of the motor moving cylinder 100 and the guide rod pressing member 170 (in) Figure 1 As shown in the diagram, five sets of main guide rods 151 and secondary guide rods 152, and six sets of main guide rods 161 and secondary guide rods 162 extend between them. The main guide rods 151, secondary guide rods 152, main guide rods 161, and secondary guide rods 162 extend and overlap at substantially the same position in the optical axis OA direction. Furthermore, not limited to this, these guide rods only need to overlap at least partially in the optical axis OA direction.

[0036] The motor moving cylinder 100 is fixed with a 5-group drive unit 5M, such as a stepper motor, and a 6-group drive unit 6M, such as a stepper motor. In addition, the 5-group drive unit 5M and the 6-group drive unit 6M are not limited to stepper motors, but can also be motors such as voice coil motors or ultrasonic motors.

[0037] Figure 4 It is from Figure 3 With the motor moving cylinder 100 removed, only the drive mechanism of the 5th frame 50 is shown in the diagram. Furthermore, the drive mechanism of the 6th frame 60 is basically the same as that of the 5th frame 50; therefore, only the drive mechanism of the 5th frame 50 will be described below, and the description of the drive mechanism of the 6th frame 60 will be omitted.

[0038] The frame 50 has five retaining portions 51 covering the outer periphery of the five lenses L5, a main guide rod engaging portion 511 extending from the outer periphery of the five retaining portions 51 toward the outer diameter side, and a secondary guide rod engaging portion 512. The secondary guide rod engaging portion 512 is positioned approximately 180 degrees relative to the main guide rod 151.

[0039] The main guide rod engaging part 511 has a front wall 511a and a rear wall 511b disposed at the front and rear, and a side wall 511d connecting the front wall 511a and the rear wall 511b. The front wall 511a and the rear wall 511b are respectively provided with guide rod insertion holes 511e through which the main guide rod 151 described later can slide.

[0040] The light-shielding part 511c protrudes from the side wall 511d towards the outer diameter side. The light-shielding part 511c is a rectangular plate-shaped portion extending a predetermined distance in the optical axis OA direction. The light-shielding part 511c is a component used to shield the light from the optical interrupter (PI) 5 mounted on the motor moving cylinder 100. The position of the five lens groups L5 can be detected by the light-shielding part 511c and the PI5.

[0041] The auxiliary guide rod engaging portion 512 is a component with a U-shaped groove open on the outer diameter side. The auxiliary guide rod 152 is slidably inserted into this U-shaped groove. In this way, the U-shaped groove of the auxiliary guide rod engaging portion 512 engages with the auxiliary guide rod 152, thereby preventing circumferential rotation centered on the main guide rod 151.

[0042] A unit frame 501, which is screwed onto the image side in the optical axis OA direction of the 5-group drive unit 5M, is mounted therewith and engages with the motor moving cylinder 100. A guide screw 502 extends from the 5-group drive unit 5M toward the rear in the optical axis OA direction, and its rear end is rotatably held in the unit frame 501. Furthermore, depending on the movement range of the 5-group lenses L5, the guide screw 502 can also be configured to extend toward the subject side in the optical axis OA direction of the 5-group drive unit 5M.

[0043] The movable guide rail 503 engages with the lead screw 502. The movable guide rail 503 remains in the main guide rod engagement part 511.

[0044] Return to Figure 1 A main base plate 88 is mounted on the rear end of the inner fixing cylinder 85 using screws. The main base plate 88 has a control unit 90, which detects the amount of rotation of the focusing ring 86 or the zoom ring 81 and inputs it to the control unit 90.

[0045] In addition, based on the photographer's focusing operations such as releasing or half-pressing, signals are also input from the camera body 3 to the control unit 90.

[0046] Therefore, the control unit 90 sends pulses to the 5th group drive unit 5M to drive the 5th group drive unit 5M. The 5th group drive unit 5M is then used to drive... Figure 4 As the lead screw 502 shown rotates, the movable guide rail 503, which engages with the lead screw 502, moves in the direction of the optical axis OA (along the direction of the optical axis OA). By means of the movement of the movable guide rail 503, the main guide rod engagement part 511 is guided straight ahead through the main guide rod 151, and the five sets of frames 50 and the five sets of lenses L5 move in the direction of the optical axis OA.

[0047] Similarly, for the 6-group frame 60 and the 6-group lens L6, during zooming and focusing, the 6-group drive unit 6M is used to drive them in the direction of the optical axis OA.

[0048] In this way, the 5-group lens L5 moves along the optical axis using the motor moving cylinder 100 and the 5-group drive unit 5M. Therefore, the amount of movement of the 5-group lens L5 is divided into the amount of movement using the motor moving cylinder 100 and the amount of movement using the 5-group drive unit 5M. Similarly, the amount of movement of the 6-group lens L6 is divided into the amount of movement using the motor moving cylinder 100 and the amount of movement using the 6-group drive unit 6M.

[0049] Figure 5 This diagram illustrates the movement of the 5-group lens L5 and the 6-group lens L6. (a) shows the zoom position at the wide-angle end W, and (b) shows the zoom position at the telephoto end T.

[0050] In this embodiment, the lens barrel 2 includes: a motor-driven barrel 100 having a cam pin 101 and movable along the optical axis OA by changing the focal distance; five sets of drive units 5M provided in the motor-driven barrel 100; five sets of lenses L5 that move relative to the motor-driven barrel 100 along the optical axis OA via the five sets of drive units 5M; six sets of drive units 6M provided in the motor-driven barrel 100; and six sets of lenses L6 that move relative to the motor-driven barrel 100 along the optical axis OA via the six sets of drive units 6M. Furthermore, for ease of explanation, in Figure 5 In (a) and (b), the following components are omitted: 5M for 5 groups of drive units, 50 for 5 groups of frames, 6M for 6 groups of drive units, 60 for 6 groups of frames, 152 for auxiliary guide rods, and 162 for auxiliary guide rods.

[0051] In the following explanation, as an example, the first focal distance is defined as the wide-angle end W, and the second focal distance as the telephoto end T. Furthermore, the 5-element lens L5 is positioned closest to the subject when the subject distance is extremely close (N) and closest to the image plane when the subject distance is infinity (∞). Similarly, the 6-element lens L6 is positioned closest to the subject when the subject distance is extremely close (N) and closest to the image plane when the subject distance is infinity (∞).

[0052] (1) The relationship between the movement X1 and X2 of the 5-group lens L5

[0053] like Figure 5 As shown in (a), at the first focal distance (wide-angle end W), using Figure 5 (a) shows the position of the 5-lens L5 in the first state (WN) with the 5-lens L5 arranged closest to the subject. If in Figure 5 In the state shown in (a), when the focal distance is changed to the second focal distance (telephoto end T) in the WN5 state, the 5-group lens L5 will... Figure 5 (b) shows the positional movement of TN5. In this way, the amount of movement of the 5-group lens L5 relative to the motor moving cylinder 100 is set as X1 when the focal distance is changed to the second focal distance (telephoto end T) instead of changing the subject distance in the first state (WN).

[0054] In addition, Figure 5 When the first focal distance (wide-angle end W) is shown in (a), use Figure 5 (a) shows the position of the 5-lens L5 in the second state (W∞) with the 5-lens L5 configured closest to the image plane. When in Figure 5 As shown in (a), when the focal distance is changed to the second focal distance (telephoto end T) in the state of W∞5, the 5-group lens L5 points towards... Figure 5 (b) shows the position movement of T∞5. In this way, the amount of movement of the 5-group lens L5 relative to the motor moving cylinder 100 is set as X2 when the focal distance is changed to the second focal distance (telephoto end T) without changing the subject distance in the second state (W∞).

[0055] At this point, the movement amount Z of the motor moving cylinder 100 is set so that the movement amount X1 is smaller than the movement amount X2.

[0056] In other words, in Figure 5 (a) shows the ratio of the drive amount X1 of the five groups of drive units 5M when the focal distance is changed to the second focal distance (telephoto end T) in the first state of WN5. Figure 5 (a) shows the 5 groups of drive units 5M with a drive amount of X2 when the focal distance is changed to the second focal distance (telescope end T) in the second state of W∞5.

[0057] Or, in Figure 5 (a) shows the movement X1 of the 5-group lens L5 relative to the master rod 151 in the case where the focal distance is changed to the second focal distance (telephoto end T) in the first state of WN5. Figure 5 (a) shows that in the second state of W∞5, when the focal distance is changed to the second focal distance (telephoto end T), the movement X2 of the 5-group lens L5 relative to the master rod 151 is small.

[0058] Therefore, when the focal distance of the five lenses L5 is changed while they are positioned closest to the subject, the amount of movement X1 of the five lenses L5 relative to the motor moving cylinder 100 can be reduced, so it is not necessary to extend the main guide rod 151 or the motor moving cylinder 100 to the subject side. Therefore, it is possible to make it thin in the optical axis direction.

[0059] (2) Relationship between the movement X1 of the 5-group lens L5 and the movement Y1 of the 6-group lens L6

[0060] like Figure 5 As shown in (a), at the first focal distance (wide-angle end W), using Figure 5 (a) WN6 indicates the position of the 6-group lens L6 in the first state (WN) with the 6-group lens L6 configured closest to the subject. When in Figure 5 When the focal distance is changed to the second focal distance (telephoto end T) in the state shown in (a) of WN6, the 6-group lens L6 points towards... Figure 5 (b) shows the positional movement of TN6. In this way, the amount of movement of the six lenses L6 relative to the motor moving cylinder 100 when the focal distance is changed to the second focal distance (telephoto end T) without changing the subject distance in the first state (WN) is set as Y1. Furthermore, Y1 can be the amount of movement of the six lenses L6 relative to the main control rod 161 when the focal distance is changed to the second focal distance (telephoto end T) in the first state (WN), or it can be the driving amount of the six-lens drive unit 6M.

[0061] At this point, the movement amount Z of the motor moving cylinder 100 is set so that the movement amount X1 is smaller than the movement amount Y1.

[0062] Therefore, when the focal distance is changed from the state where the 5-group lens L5 is positioned closest to the subject, since the amount of movement X1 of the 5-group lens L5 relative to the motor moving cylinder 100 can be reduced, it is not necessary to extend the main guide rod 151 or the motor moving cylinder 100 to the subject side. Therefore, it is possible to make it thin in the optical axis direction.

[0063] The effects of (1) and (2)

[0064] Inside the motor moving cylinder 100, five sets of lenses L5 are arranged on the subject side and six sets of lenses L6 are arranged on the image side.

[0065] When the five lenses L5 of the motor moving cylinder 100 are positioned closest to the subject, if the amount of movement relative to the motor moving cylinder 100 or the guide rod 151 caused by zooming is increased, it is necessary to increase the length of the main guide rod 151 or the auxiliary guide rod 152 or the length of the motor moving cylinder 100, thereby making it larger.

[0066] According to the embodiment, when the five lenses L5 of the motor moving cylinder 100 are arranged on the subject side, in the state where they are arranged closest to the subject side, since the amount of movement relative to the motor moving cylinder 100 or the guide rod 151 caused by zooming is reduced, it is not necessary to increase the length of the main guide rod 151 or the secondary guide rod 152, thus enabling the miniaturization and thinning of the lens barrel 2.

[0067] (3) Relationship between the movement Y1 and Y2 of the 6-group lens L6

[0068] like Figure 5 As shown in (a), at the first focal distance (wide-angle end W), using Figure 5 (a) W∞6 represents the position of the 6-lens L6 in the second state (W∞) where the 6-lens L6 is configured closest to the image plane. If in Figure 5 (a) shows that when the focal distance is changed to the second focal distance (telephoto end T) in the state of W∞6, the 6-group lens L6 moves towards... Figure 5 (b) shows the position movement of T∞6. In this way, the amount of movement of the 6-lens L6 relative to the motor moving cylinder 100 when the focal distance is changed to the second focal distance (telephoto end T) without changing the subject distance in the second state (W∞) is set as Y2. Furthermore, Y2 can be set as the amount of movement of the 6-lens L6 relative to the main control rod 161 when the focal distance is changed to the second focal distance (telephoto end T) in the second state (W∞), or it can be used as the driving amount of the 6-lens drive unit 6M.

[0069] At this point, the movement amount Z of the motor moving cylinder 100 is set so that Y2 becomes smaller than Y1. Therefore, when the focal distance is changed with the 6-lens L6 positioned closest to the image plane, the movement amount Y2 of the 6-lens L6 relative to the motor moving cylinder 100 can be reduced, so it is not necessary to extend the master rod 161 or the motor moving cylinder 100 to the image plane side. Therefore, it is possible to make it thin in the optical axis direction.

[0070] (4) Relationship between the movement X2 of the 5-group lens L5 and the movement Y2 of the 6-group lens L6

[0071] The movement amount Z of the motor moving cylinder 100 is set such that the movement amount Y2 of the 6-group lens L6 relative to the motor moving cylinder 100 when the focal distance is changed to the second focal distance (telephoto end T) in the second state (W∞) is smaller than the movement amount X2 of the 5-group lens L5 relative to the motor moving cylinder 100 when the focal distance is changed to the second focal distance (telephoto end T) in the second state (W∞).

[0072] Therefore, when the focal distance is changed with the 6-lens L6 positioned closest to the image plane, the amount of movement Y2 of the 6-lens L6 relative to the motor moving cylinder 100 can be reduced, so it is not necessary to extend the master rod 161 or the motor moving cylinder 100 to the image plane side. Therefore, it is possible to make it thin in the optical axis direction.

[0073] The effects of (3) and (4)

[0074] Inside the motor moving cylinder 100, five sets of lenses L5 are arranged on the subject side and six sets of lenses L6 are arranged on the image side.

[0075] When the 6 lenses L6 of the motor moving cylinder 100 are positioned closest to the image side, if the amount of movement relative to the motor moving cylinder 100 or the guide rod 161 caused by zooming is increased, it is necessary to increase the length of the main guide rod 161 or the auxiliary guide rod 162 or the length of the motor moving cylinder 100, thereby making it larger.

[0076] According to the embodiment, when the six lenses L6 of the motor moving cylinder 100 are also positioned closest to the image side, the amount of movement relative to the motor moving cylinder 100 or the guide rod 161 caused by zooming is reduced, so it is not necessary to increase the length of the main guide rod 161 or the secondary guide rod 162, thus enabling miniaturization of the lens barrel 2.

[0077] (5) Positional relationship between the 5-group lens L5 and the 6-group lens L6

[0078] In the first state (wide-angle end W, extremely close state N), the 6-group lens L6 (WN6) is positioned closer to the image plane than the 5-group lens L5 (W∞5) in the second state (wide-angle end W, infinity state ∞). Furthermore, in the first state (WN) when the focal distance is changed to the second focal distance (telephoto end T), the 6-group lens L6 (TN6) is positioned on the subject side compared to the 5-group lens L5 (T∞5) in the second state (W∞) when the focal distance is changed to the second focal distance (telephoto end T). That is to say, as... Figure 5 As shown in (a) and (b), at the wide-angle end W, the positional relationship between the five-lens L5 arrangement (W∞5) closest to the image plane and the six-lens L6 arrangement (WN6) closest to the subject is the opposite of the positional relationship at the telephoto end T. This allows the five-lens L5 to move further towards the image plane, and the six-lens L6 to move further towards the subject, enabling greater movement within the range of the guide rods 151, 161, or the motor moving cylinder 100.

[0079] (5) Effect

[0080] In a lens barrel 2 where the 5-group lens L5 and the 6-group lens L6 are moved in the same direction from the extremely near N state to the infinite ∞ state, the positional relationship between the infinite state (W∞5) of the 5-group lens L5 at the wide-angle end W and the extremely near state (WN6) of the 6-group lens L6, as well as the positional relationship between the infinite state (T∞5) of the 5-group lens L5 at the telephoto end T and the extremely near state (TN6) of the 6-group lens L6, changes.

[0081] Therefore, the guide rods 151, 152, 161, and 162 that guide the 5-group lens L5 and the 6-group lens L6 can be used more effectively, thereby enabling the lens barrel 2 to be miniaturized and thinned.

[0082] (6) Figure 6 This diagram illustrates the movement of the 5-group lens L5 in its extremely close N state, the movement of the 6-group lens L6 in its infinite ∞ state, and the movement of the motor moving cylinder 100 when the focal distance is changed from the wide-angle end W to the telephoto end T.

[0083] In the extremely close N state, the movement amount of the 5-group lens L5 when the focal distance is changed from the wide-angle end W to the telephoto end T is set to XX1. In the infinity ∞ state, the movement amount of the 6-group lens L6 when the focal distance is changed from the wide-angle end W to the telephoto end T is set to YY1. In addition, the movement amount of the motor moving cylinder 100 when the focal distance is changed from the wide-angle end W to the telephoto end T is set to ZZ.

[0084] In the implementation method, such as Figure 6 As shown in (a), when the movement amount XX1 of the 5-group lens L5 is greater than the movement amount YY1 of the 6-group lens L6, the movement amount ZZ of the motor moving cylinder 100 is as follows: Figure 6 As shown in (b), the movement ZZ of the motor moving cylinder 100 is greater than the movement ZZ of the 5-lens L5 when the movement XX1 is smaller than the movement YY1 of the 6-lens L6.

[0085] (6) Effect

[0086] By setting the movement trajectory of the motor moving cylinder 100 in this way, it is possible to reduce Figure 5 X1 and Y2 in (b).

[0087] (7) If the lens barrel 2 is changed from the wide-angle end W to the telephoto end T, the motor moving barrel 100 moves in the direction of the optical axis OA. In addition, the 5-group lens L5 and the 6-group lens L6 move relative to the motor moving barrel 100 via the 5-group drive unit 5M and the 6-group drive unit 6M.

[0088] At this time, the fifth lens group L5 and the sixth lens group L6 move in one direction relative to the motor moving cylinder 100. That is, regarding the positional relationship between the fifth lens group L5 and, for example, the cam pin 101 of the motor moving cylinder 100, they are always moving away from each other when zooming is performed while the focus is at infinity ∞. Similarly, regarding the positional relationship between the sixth lens group L6 and, for example, the cam pin 101 of the motor moving cylinder 100, they are also always moving away from each other when zooming is performed while the focus is at infinity ∞.

[0089] However, it is not limited to this. The positional relationship between the 5-group lens L5 and the 6-group lens L6 and the cam pin 101 of the motor moving cylinder 100 can also remain close or fixed when zooming in the state of focusing at infinity ∞.

[0090] Furthermore, the positional relationship between the 5 groups of lenses L5 and the 6 groups of lenses L6 at extremely close N and the motor moving cylinder 100 can be adjusted so that the focus remains constant, either close to or far from the focus point at infinity ∞.

[0091] (7) Effect

[0092] If the positional relationship between the 5-group lens L5 and the 6-group lens L6 and the motor moving cylinder 100 is zoomed when the lens is focused at infinity ∞, and there is a situation where the lens moves in the opposite direction instead of in one direction (there is a situation where it turns around and returns), the 5-group drive unit 5M and the 6-group drive unit 6M rotate in the opposite direction.

[0093] Therefore, the loosening between the drive unit 5M for group 5 and the drive unit 6M for group 6 and the lead screw may cause a corresponding delay.

[0094] However, in the implementation, the 5M drive unit for group 5 and the 6M drive unit for group 6 always rotate in one direction, so there is no loosening or movement delay.

[0095] Furthermore, since the lens barrel 2 is more likely to be zoomed at infinity compared to the extremely close state, it is sufficient to set it to not rotate in reverse at infinity, as in the implementation method. However, it can also be set to not rotate in reverse at the extremely close state, or it can be set to not rotate in reverse at both the infinity and extremely close states.

[0096] In the above embodiments, it is described that the first focal distance is set to the wide-angle end W and the second focal distance is set to the telephoto end T, but it is not limited to this. For example, it can be a state where the first focal distance is the middle (middle) 1 and the second focal distance is the middle (middle) 2, which has a focal distance longer than the middle (middle) 1.

[0097] Furthermore, in the above embodiment, it was described that the five lens groups L5 are arranged on the side closest to the subject when the subject distance N is extremely close at the wide-angle end W and on the side closest to the image plane when the subject distance ∞ is infinity, but this is not a limitation. For example, they can also be arranged on the side closest to the subject when the subject distance is infinity ∞ and on the side closest to the image plane when the subject distance is extremely close N.

[0098] Furthermore, it was explained that when the 6-group lens L6 is at the first focal distance (wide-angle end W) and the second focal distance (telephoto end T), it is positioned on the side closest to the subject when the subject distance is extremely close (N), and on the side closest to the image plane when the subject distance is infinity (∞), but it is not limited to this. For example, it can also be positioned on the side closest to the subject when the subject distance is infinity (∞), and on the side closest to the image plane when the subject distance is extremely close (N).

[0099] Furthermore, the implementation is not limited to the above-described embodiments; any combination thereof is also possible.

Claims

1. A lens barrel, comprising: A moving cylinder that moves along the optical axis by changing the focal distance; The first drive unit provided by the movable cylinder; The first lens moves relative to the moving cylinder along the optical axis via the first driving unit; The second drive unit of the movable cylinder; and The second lens is movable relative to the moving cylinder along the optical axis by the second driving unit, and is positioned on the image-plane side compared to the first lens. The amount of movement of the second lens relative to the moving barrel when the focal distance is changed to the second focal distance in the first state where the second lens is positioned on the side closest to the image plane with the first focal distance is smaller than the amount of movement of the second lens relative to the moving barrel in the second state where the focal distance is changed to the second focal distance in the second state where the second lens is positioned on the side closest to the subject compared to the first state with the first focal distance.

2. The lens barrel according to claim 1, wherein, The amount of movement of the second lens relative to the moving cylinder when the focal distance is changed to the second focal distance in the first state is smaller than the amount of movement of the first lens relative to the moving cylinder when the focal distance is changed to the second focal distance in the first state.

3. The lens barrel according to claim 1, wherein, The amount of movement of the first lens relative to the moving cylinder when the focal distance is changed to the second focal distance in the second state is smaller than the amount of movement of the first lens relative to the moving cylinder when the focal distance is changed to the second focal distance in the first state.

4. The lens barrel according to claim 1, wherein, The amount of movement of the first lens relative to the moving cylinder when the focal distance is changed to the second focal distance in the second state is smaller than the amount of movement of the second lens relative to the moving cylinder when the focal distance is changed to the second focal distance in the second state.

5. The lens barrel according to claim 1, wherein, The first lens in the second state is positioned closer to the subject compared to the first lens in the first state.

6. The lens barrel according to claim 1, wherein, The first lens in the first state is positioned closer to the subject than the second lens in the second state. The first lens, when the focal distance is changed to the second focal distance in the first state, is positioned on the image-plane side compared to the second lens, when the focal distance is changed to the second focal distance in the second state.

7. The lens barrel according to claim 1, wherein, The movable cylinder has a cam follower. When the focal distance is changed in either the first state or the second state, the second lens moves relative to the cam follower in a predetermined direction.

8. The lens barrel according to claim 1, wherein, The amount of movement of the movable cylinder in a first specific case is greater than the amount of movement of the movable cylinder in a second specific case. The first specific case is when the amount of movement of the first lens when the focal distance is changed to the second focal distance in the first state is greater than the amount of movement of the second lens when the focal distance is changed to the second focal distance in the second state. The second specific case is when the amount of movement of the first lens when the focal distance is changed to the second focal distance in the first state is smaller than the amount of movement of the second lens when the focal distance is changed to the second focal distance in the second state.

9. A lens barrel, comprising: A moving cylinder that moves along the optical axis by changing the focal distance; The first drive unit provided by the movable cylinder; The first lens moves relative to the moving cylinder along the optical axis via the first driving unit; The second drive unit of the movable cylinder; and The second lens is movable relative to the moving cylinder along the optical axis by the second driving unit, and is positioned on the image-plane side compared to the first lens. The amount of movement of the second lens relative to the moving cylinder when the focal distance is changed to the second focal distance in the first state where the second lens is positioned on the side closest to the image plane with the first focal distance is smaller than the amount of movement of the first lens relative to the moving cylinder when the focal distance is changed to the second focal distance in the first state.

10. A camera device comprising a lens barrel according to any one of claims 1 to 9.

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