Lens barrel and image pickup apparatus

Abstract

A lens barrel and an image pickup apparatus. A lens barrel capable of maintaining a high-precision lens while achieving miniaturization, the lens barrel including a first lens and a second lens; a first lens frame holding the first lens and a second lens frame holding the second lens; and a first guide rod supporting the first lens frame such that the first lens frame is movable in the optical axis direction, in which the first lens frame includes a sleeve portion including a first hole portion and a second hole portion engaged with the first guide rod, and an opening portion formed between the first hole portion and the second hole portion, the second lens frame is provided with a third hole portion engaged with the first guide rod, and when the first guide rod is engaged with the first hole portion and the second hole portion of the first lens frame and the third hole portion of the second lens frame, the first lens frame and the second lens frame are positioned by the first guide rod in a direction perpendicular to the optical axis, and the third hole portion of the second lens frame is disposed within the opening portion of the sleeve portion.

Description

Technical Field

[0001] The invention relates to a lens barrel and an image pickup device. Background Art

[0002] In the prior art, in order to realize a high-quality zoom lens, it is known that a fixed lens for compensating imaging performance by refracting light is provided in addition to a movable zoom lens and a focus lens. In addition, generally, a lens frame holding the fixed lens may have a hole for positioning the lens frame relative to the housing, and the hole may first engage with a positioning boss provided on the housing, thereby positioning the fixed lens frame.

[0003] However, in the case of such a positioning structure, a space for the positioning boss provided in the housing is required, which makes the overall size of the lens barrel larger. On the other hand, in order to achieve high image quality, it is preferable to reduce the relative position deviation between the center of the fixed lens and the center of the zoom lens, that is, to hold the lens with high precision. However, when the fixed lens frame is positioned by the positioning boss provided in the housing, the positioning structure is different from the positioning structure of the zoom lens that is movable when positioned by engaging with the guide rod, so a relative position deviation is likely to occur between the centers of the two lenses.

[0004] Japanese Patent Publication No. 2014-006465 discloses a structure in which, when the lens holding frame is inserted into the drive head side of the drive motor, the position detection pulse plate attached to the screw portion of the drive motor and the lens holding frame overlap each other in the radial direction. In addition, Japanese Patent Publication No. 2018-180322 discloses a structure in which a notch is provided on the outside of the aperture unit so that a part of the lens drive motor head is located inside the outside of the aperture unit.

[0005] However, when the prior art disclosed in each of Japanese Patent Application Laid-Open No. 2014-006465 and Japanese Patent Application Laid-Open No. 2018-180322 is applied to a lens holding structure that enables high-precision lens holding while achieving miniaturization, it is difficult to achieve high-precision lens holding even if miniaturization is possible. Summary of the invention

[0006] In view of the above circumstances, an object of the present invention is to provide a lens barrel capable of achieving high-precision lens holding and miniaturization.

[0007] According to one aspect of the present invention, a lens barrel includes a first lens and a second lens; a first lens frame that holds the first lens and a second lens frame that holds the second lens; and a first guide rod that supports the first lens frame so that the first lens frame can move in the direction of the optical axis, wherein the first lens frame includes a sleeve portion, the sleeve portion includes a first hole portion and a second hole portion that are engaged with the first guide rod and an opening portion formed between the first hole portion and the second hole portion, the second lens frame is provided with a third hole portion that is engaged with the first guide rod, and when the first guide rod is engaged with the first hole portion and the second hole portion of the first lens frame and the third hole portion of the second lens frame, the first lens frame and the second lens frame are positioned in a direction perpendicular to the optical axis by the first guide rod, and the third hole portion of the second lens frame is arranged in the opening portion of the sleeve portion.

[0008] Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a configuration diagram showing an example of an image pickup apparatus according to an embodiment.

[0010] Figure 2 is an exploded perspective view showing the configuration of a zoom lens barrel according to an embodiment.

[0011] Figure 3 is a block diagram of an image pickup apparatus according to an embodiment.

[0012] Figure 4A and Figure 4B is a diagram showing details of a movable lens frame and a fixed lens frame according to an embodiment.

[0013] Figure 5 is a detailed view showing the movable lens frame and the fixed lens frame engaged with two guide rods.

[0014] Fig. 6A and Figure 6B : is a diagram showing a state in which the hole portion of the fixed lens frame is arranged in the opening of the sleeve portion of the movable lens frame.

[0015] Figure 7 1 is a diagram showing a state in which the fixed lens frame is fastened to the rear fixed frame with screws.

[0016] Fig. 8A and Figure 8B 2 is a diagram showing a state in which the zoom position of the movable lens frame is at the WIDE end position.

[0017] Fig. 9A and Fig. 9B 1 is a diagram showing a state where the zoom position of the movable lens frame is at the TELE end position.

[0018] Fig. 10A and Fig. 10B is a diagram showing a state in which two guide rods, a fixed lens frame, an aperture unit, and a movable lens frame are combined and then inserted into a rear fixed frame, and the fixed lens frame is fastened to the rear fixed frame.

[0019] Fig.11 yes Fig. 10A and Fig. 10B A partial enlarged view of the state shown.

[0020] Fig. 12A and Fig. 12B It is shown from Fig. 10A and Fig. 10B The state shown is a diagram of a state in which the rear fixing frame is removed. DETAILED DESCRIPTION

[0021] Hereinafter, an embodiment for implementing the present invention will be described in detail with reference to the accompanying drawings. The embodiment to be described below is an example of a means for realizing the present invention, and should be appropriately modified or changed according to the configuration and various conditions of the device to which the present invention is applied, and the present invention is not limited to the following embodiment.

[0022] (First Embodiment)

[0023] Figure 1 is a structural diagram of a camera device according to the present embodiment. The camera device of the present embodiment is constructed to include a cover 2, a dome cover 3, a zoom lens barrel 4, an image sensor unit 5, and a pan / tilt rotating unit 6. In the present embodiment, the camera device is constructed as a network camera. More specifically, in the present embodiment, the camera device is constructed as a network surveillance camera.

[0024] The image sensor unit 5 holds the image sensor and is attached to the zoom lens barrel 4. The pan / tilt rotating unit 6 holds the zoom lens barrel 4 so that it can rotate in the panning, tilting and rotation directions. The dome cover 3 is fastened to the camera apparatus by a plurality of fastening screws 1 while being clamped between the cover 2 and the pan / tilt rotating unit 6.

[0025] Figure 2 An example of an exploded perspective view of a zoom lens barrel 4 according to the present embodiment is shown. The zoom lens barrel 4 according to the present embodiment has four lens groups. Lens 9 is a fixed group fixed (non-movable) in the optical axis direction. Zoom lens (first lens) 13 is a movable lens that moves in the optical axis direction to perform a variable magnification operation. Focus lens 22 moves in the optical axis direction to perform a focusing operation.

[0026] The fixed lens frame 8 is fixed to the front fixed frame (front fixed cylinder) 10 by screws 7. The front fixed frame 10 is connected to the rear fixed frame (rear fixed cylinder) 24 by screws (not shown).

[0027] The guide rod (second guide rod) 11 , the guide rod (first guide rod) 12 , the guide rod 19 , and the guide rod 20 are fixed in a state of being sandwiched between the front fixing frame 10 and the rear fixing frame 24 .

[0028] The movable lens frame (first lens frame) 14 holds the zoom lens 13 and is supported by the guide rod 12 to be movable in the optical axis direction. The U-shaped groove on the movable lens frame 14 engages with the U-shaped groove on the guide rod 11, thereby limiting the rotation of the movable lens frame 14 around the guide rod 12, that is, around the optical axis.

[0029] The rack 15 is fixed to the movable lens frame 14 while being urged in the optical axis direction and the rotation direction by a rack spring (not shown). The rack 15 is screwed to the screw portion of the stepping motor 25 and moves along the optical axis direction together with the movable lens frame 14 by the rotation of the screw portion.

[0030] The diaphragm unit 16 is fixed to a fixed lens frame (second lens frame) 17 holding a fixed lens (second lens) 18 by screws (not shown), and adjusts the amount of light incident on the zoom lens barrel 4 by changing the diaphragm diameter to a plurality of states.

[0031] The movable lens frame 21 holds the focusing lens 22 and is supported by the guide rod 19 to be movable in the optical axis direction. The U-shaped groove on the movable lens frame 21 engages with the U-shaped groove on the guide rod 20, thereby limiting the rotation of the movable lens frame 21 around the guide rod 19, that is, around the optical axis.

[0032] The rack 23 connected to the movable lens frame 21 is fixed to the movable lens frame 21 in a state where it is biased in the optical axis direction and the rotation direction by a rack spring (not shown). The rack 23 is screwed to the screw portion of the stepping motor 26 and moves along the optical axis direction together with the movable lens frame 21 by the rotation of the screw portion.

[0033] The filter moving frame 28 holds the infrared cut filter 29 and the glass member 30, and is supported by the guide rod 32 to be movable in the optical axis direction. The U-shaped groove on the filter moving frame 28 engages with the U-shaped groove on the guide rod 35, thereby limiting the rotation of the filter moving frame 28 around the guide rod 32, that is, around the optical axis.

[0034] The rack 31 connected to the filter moving frame 28 is fixed to the filter moving frame 28 in a state where it is urged in the optical axis direction and the rotation direction by a rack spring (not shown). The rack 31 is screwed to the screw portion of the stepping motor 27, and moves together with the filter moving frame 28 in a direction perpendicular to the optical axis by the rotation of the screw portion. By retracting the infrared cut filter 29 from the optical path, it is possible to image a subject even at night.

[0035] The sensor holder 33 holds the image sensor unit 5 using screws (not shown) for the image element, and is fixed to the rear fixing frame 24 by screws 34 .

[0036] The origin position of the movement of the movable lens frames 14 and 21 in the optical axis direction is detected by a detector such as a photointerrupter (not shown) fixed to a flexible printed circuit (FPC) (not shown) by soldering. The FPC is connected to the aperture unit 16, the stepping motors 25, 26 and 27, and the photodetector (not shown), and is activated by powering on.

[0037] The photodetector is arranged on the moving area of ​​the movable lens frames 14 and 21. The positions of the movable lens frames 14 and 21 are controlled by the output of the photodetector and the number of driving pulses of the stepping motors 25 and 26. Lenses such as the lens 9, the zoom lens 13, the fixed lens 18, and the focusing lens 22 function as imaging lenses.

[0038] Figure 3 3 is a block diagram of an imaging device of the present embodiment. The imaging device is composed of, for example, a camera 36 installed outdoors and an operating unit (information processing device) 37 for operating the camera 36. The camera 36 and the operating unit 37 are connected to each other so that they can communicate with each other via a communication line 38. The camera 36 and the operating unit 37 can also constitute an imaging system.

[0039] The camera 36 includes a control unit 39, a panning drive unit 40, a tilting drive unit 41, a rotation drive unit 42, a zoom lens drive unit 43, a focus lens drive unit 44, an aperture drive unit 45, and a switching drive unit 46. The camera 36 also includes a first detection unit 47, a second detection unit 48, a first storage unit 49, a second storage unit 50, a first calculation unit 51, a second calculation unit 52, a third detection unit 53, a third storage unit 54, and a third calculation unit 55.

[0040] The control unit 39 includes a CPU, a memory (storage unit), a signal processing unit, etc., and is composed of at least one computer. The control unit 39 comprehensively controls the operation of the camera 36, ​​etc. according to the program stored in the memory. Specifically, the control unit 39 controls panning, tilting, rotation, etc. in the camera 36 according to a control signal (control command) output (transmitted) in response to an operation (input) from the operation unit 37. The number of CPUs and the number of memories included in the control unit 39 are not limited to one, but may be two or more.

[0041] The pan drive unit 40 controls the imaging direction (pan control) of the camera 36. The pan drive unit 40 is connected to the control unit 39. The pan drive unit 40 includes a driving mechanism such as a motor and a deceleration mechanism. The pan drive unit 40 changes the direction (imaging direction) of the camera 36 (changes the posture) by driving the driving mechanism based on a control signal (control command) output in response to the operation from the operation unit 37 and received via the control unit 39. The imaging direction that can be changed by the pan drive unit 40 is the pan direction (horizontal direction). The pan drive unit 40 also includes a sensor capable of angle detection. The sensor is also used as a pan angle detection unit that detects the pan angle of the camera 36. The detection result detected by the sensor of the pan drive unit 40 is transmitted to the control unit 39.

[0042] The tilt drive unit 41 controls the imaging direction (tilt control) of the camera 36. The tilt drive unit 41 is connected to the control unit 39. The tilt drive unit 41 is equipped with a drive mechanism such as a motor and a deceleration mechanism. The tilt drive unit 41 changes the direction (imaging direction) of the camera 36 (changes the posture) by driving the drive mechanism based on a control signal (control command) output in response to an operation from the operation unit 37 and received via the control unit 39. The imaging direction that can be changed by the tilt drive unit 41 is a tilt direction (vertical direction). The tilt drive unit 41 also includes a sensor capable of angle detection. The sensor is also used as a tilt angle detection unit that detects the tilt angle of the camera 36. The detection result detected by the sensor of the tilt drive unit 41 is transmitted to the control unit 39.

[0043] The rotation drive unit 42 controls the imaging direction (rotation control) of the camera 36. The rotation drive unit 42 is connected to the control unit 39. The rotation drive unit 42 is equipped with a driving mechanism such as a motor and a reduction mechanism. The rotation drive unit 42 changes the direction (imaging direction) of the camera 36 (changes the posture) by driving the driving mechanism based on a control signal (control command) output in response to the operation from the operation unit 37 and received via the control unit 39. The imaging direction that can be changed by the rotation drive unit 42 is the rotation direction. The rotation drive unit 42 also includes a sensor capable of angle detection. The sensor is also used as a rotation angle detection unit that detects the rotation angle of the camera 36. The detection result detected by the sensor of the rotation drive unit 42 is transmitted to the control unit 39.

[0044] The zoom lens driving unit 43 controls the position of the zoom lens 13 by moving the movable lens frame 14 that holds the zoom lens 13 in the optical axis direction. The zoom lens driving unit 43 is composed of a driving mechanism such as a stepping motor, and the stepping motor 25 is used as the zoom lens driving unit 43 in the present embodiment. The zoom lens driving unit 43 is connected to the control unit 39. The zoom lens driving unit 43 changes the position of the zoom lens by driving the stepping motor 25 based on a control signal (control command) output in response to an operation from the operation unit 37 and received via the control unit 39. The zoom lens driving unit 43 also includes a first detection unit 47. The first detection unit 47 detects the number of driving pulses of the stepping motor 25. The detection result detected by the first detection unit 47 is transmitted to the control unit 39.

[0045] The focus lens driving unit 44 controls the position of the focus lens 22 by moving the movable lens frame 21 holding the focus lens 22 in the optical axis direction. The focus lens driving unit 44 is composed of a driving mechanism such as a stepping motor, and the stepping motor 26 is used as the focus lens driving unit 44 in the present embodiment. The focus lens driving unit 44 is connected to the control unit 39. The focus lens driving unit 44 changes the position of the focus lens by driving the stepping motor 26 based on a control signal (control command) output in response to an operation from the operation unit 37 and received via the control unit 39. The focus lens driving unit 44 also includes a second detection unit 48. The second detection unit 48 detects the number of drive pulses of the stepping motor 26. The detection result detected by the second detection unit 48 is also transmitted to the control unit 39.

[0046] The aperture driving unit 45 adjusts the amount of light incident on the zoom lens barrel 4 by changing the aperture diameter into a plurality of states. In the present embodiment, the aperture unit 16 is used as the aperture driving unit 45.

[0047] The switching drive unit 46 controls switching between the infrared cut filter 29 and the glass member 30. The switching drive unit 46 is connected to the control unit 39. The switching drive unit 46 switches between the infrared cut filter 29 and the glass member 30 by driving of a drive mechanism (not shown) based on a control signal (control command) output in response to an operation from the operation unit 37 and received via the control unit 39. The switching drive unit 46 also includes a detection unit composed of a sensor or the like, which detects the position of the filter moving frame 28 holding the infrared cut filter 29. The detection result detected by the detection unit is transmitted to the control unit 39.

[0048] The first storage unit 49 stores the number of driving pulses of the stepper motor 25. The first storage unit 49 is connected to the control unit 39. The second storage unit 50 stores the number of driving pulses of the stepper motor 26. The second storage unit 50 is connected to the control unit 39. The control unit 39 is also able to read the information stored in the first storage unit 49 and the second storage unit 50 at any time.

[0049] The first calculation unit 51 calculates the number of driving pulses of the zoom lens driving unit 43 to drive to a predetermined position based on the detection result obtained by the first detection unit 47 and the number of driving pulses of the stepping motor 25 stored in the first storage unit 49. The first calculation unit 51 is connected to the control unit 39. The second calculation unit 52 calculates the number of driving pulses of the focus lens driving unit 44 to drive to a predetermined position based on the detection result obtained by the second detection unit 48 and the number of driving pulses of the stepping motor 26 stored in the second storage unit 50. The second calculation unit 52 is connected to the control unit 39.

[0050] The third detection unit 53 detects the position of the driving arm from the brightness difference value of the aperture. The third detection unit 53 is connected to the control unit 39. The third storage unit 54 stores the preset rotation angle position of the driving arm. The third storage unit 54 is connected to the control unit 39. The third calculation unit 55 calculates the difference value based on the detection result of the driving arm position detected by the third detection unit 53 and the rotation angle position of the driving arm stored in the third storage unit 54. The third calculation unit 55 is connected to the control unit 39.

[0051] Based on the calculation result of the third calculation unit 55 , the control unit 39 causes the diaphragm driving unit 45 to drive the diaphragm blades held by the driving arm so that an optimum amount of light is incident on the image sensor in the image sensor unit 5 .

[0052] The operation unit 37 includes a CPU 101 , a ROM 102 , a RAM 103 , a display unit 104 , an operation unit 105 , and a communication unit 106 .

[0053] The CPU 101 is a central processing unit that reads a control program stored in a read-only memory (ROM) 102 and executes various processes. The ROM 102 is a nonvolatile memory that stores programs for the camera 36 and the operation unit 37, other programs (control programs) required for control, and various data.

[0054] A random access memory (RAM) 103 is a volatile memory and is used as a main memory and a temporary storage area such as a work area of ​​the CPU 101. The RAM 103 also temporarily stores various data such as image and video data. The display unit 104 is composed of a display device such as a monitor or a display, and displays, for example, images and videos taken by the camera 36.

[0055] The operation unit 105 is constituted by an input device such as a keyboard and a mouse. By operating the operation unit 105, instructions for panning, tilting, and rotating operations of the camera 36, ​​opening and closing of the aperture blades in the aperture unit 16, and switching of the infrared cut filter can be given. The operator can operate the operation unit 105 while confirming the video shot by the camera 36 on the screen of the display unit 104 so as to image the subject at a desired magnification, and can display the imaged subject on the display unit 104. The communication unit 106 performs communication processing such as transmission of a control signal (control command) to the camera 36 in a wired or wireless manner via a network.

[0056] Although not shown in the figure, the operation unit 37 includes a storage device (storage section). The storage device stores various data, various programs, etc. The storage device is a non-volatile storage device such as an HDD, a flash memory, or an SD card. The storage device is used as a permanent storage area for the OS, various programs, and various data, and is also used as a short-term storage area for various data.

[0057] The functions and processing of the camera 36 and the operation unit 37 are realized by the CPU 101 reading a program stored in the ROM 102 or a storage device and executing the program. As another example, the CPU 101 may read a program stored in a recording medium such as an SD card instead of the ROM 102.

[0058] In the present embodiment, the operation unit 37 performs each process of the camera 36 and the operation unit 37 by causing one processor (CPU 101) to use one storage (ROM 102), but other configurations may be adopted. For example, the processes of the camera 36 and the operation unit 37 may also be performed by cooperatively operating a plurality of processors, a plurality of RAMs, ROMs, and storage devices. In addition, some processes may be performed using hardware loops. In addition, the functions and processes of the camera device may be implemented using a processor other than a CPU. In addition, for example, a graphics processing unit may be used instead of a CPU.

[0059] Figure 4A and Figure 4B is a diagram showing an example of details of the movable lens frame 14 and the fixed lens 18 . Figure 4A 1 is a diagram showing an example of details of the movable lens frame 14 that holds the zoom lens 13 when viewed from the imaging surface side (image sensor side). The movable lens frame 14 in the present embodiment includes a sleeve portion 59 for engaging with the guide rod 12 .

[0060] The sleeve portion 59 is provided with a first hole portion 60 and a second hole portion 61 for engaging with the guide rod 12 on one side. The first hole portion 60 is provided toward the imaging surface side of the sleeve portion 59, and the second hole portion 61 is provided toward the subject side of the sleeve portion 59. In addition, the sleeve portion 59 has an opening 64 between the first hole portion 60 and the second hole portion 61. The opening 64 is an opening portion of the sleeve portion 59 formed between the first hole portion 60 and the second hole portion 61 when viewed from the inside in a direction perpendicular to the optical axis OA.

[0061] The sleeve portion 59 is connected to the rack 15 and is screwed to the rack 15 using a screw portion (not shown) of the stepping motor 25 , and thus the zoom lens 13 can be linearly moved in the direction of the optical axis OA.

[0062] Figure 4B Detailed view of the fixed lens frame 17 holding the fixed lens 18 when viewed from the imaging surface side. The fixed lens frame 17 includes a hole portion (third hole portion) 62 for engaging with the guide rod 12 and a long hole portion (fourth hole portion) 63 for engaging with the guide rod 11. The hole portion 62 is capable of limiting the position of the fixed lens frame 17 in a vertical plane (in a plane perpendicular to the optical axis OA) relative to the optical axis OA. The long hole portion 63 is provided to limit the rotation direction of the fixed lens frame 17 relative to the optical axis OA.

[0063] Figure 5 1 is a detailed view showing a state in which the movable lens frame 14 and the fixed lens frame 17 are simultaneously engaged with each other through the guide rods 11 and 12 . Figure 5 Also shown is a perspective view of a state in which the movable lens frame 14 and the fixed lens frame 17 are simultaneously engaged with each other by the guide rods 11 and 12 when viewed from the imaging surface side.

[0064] like Figure 5As shown, the movable lens frame 14 and the fixed lens frame 17 are engaged with each other through the guide rod 11 and the guide rod 12, so that the hole portion 62 of the fixed lens frame 17 is combined with the opening 64 provided in the sleeve portion 59 (the hole portion 62 is fitted into the opening 64). Then, the guide rod 12 is engaged with the movable lens frame 14 and the fixed lens frame 17, so that the two lens frames (the movable lens frame 14, the fixed lens frame 17) are simultaneously positioned in a plane perpendicular to the optical axis OA or in a direction perpendicular to the optical axis with the guide rod 12 as a reference. Engaging the guide rod 12 with the movable lens frame 14 and the fixed lens frame 17 represents a state in which the guide rod 12 is engaged with each of the first hole portion 60 and the second hole portion 61 of the movable lens frame 14 and the hole portion 62 of the fixed lens frame 17.

[0065] Similar to the guide rod 12, the guide rod 11 is engaged with the movable lens frame 14 and the fixed lens frame 17, thereby limiting the rotation (rotation position) of the two lens frames around the optical axis in a plane perpendicular to the optical axis OA or in a direction perpendicular to the optical axis. That is, in a state where the rotation around the optical axis OA is limited by the guide rod 11, the movable lens frame 14 and the fixed lens frame 17 are positioned by the guide rod 11. Engaging the guide rod 11 with the movable lens frame 14 and the fixed lens frame 17 means a state where the U-shaped groove on the guide rod 11 is engaged with the U-shaped groove on the movable lens frame 14, and the guide rod 11 is engaged with the long hole portion 63 of the fixed lens frame.

[0066] Furthermore, the guide rods 11 and 12 are engaged with the movable lens frame 14 and the fixed lens frame 17 , so that the hole portion 62 of the fixed lens frame 17 is arranged (disposed) in (within) the opening 64 of the sleeve portion 59 .

[0067] Then, the guide rods 11 and 12 are engaged with the movable lens frame 14 and the fixed lens frame 17, so that when viewed in the direction of the optical axis OA, the first hole portion 60 and the second hole portion 61 of the sleeve portion 59 and the hole portion 62 of the fixed lens frame 17 are arranged to overlap each other. For this reason, both the movable lens frame 14 and the fixed lens frame 17 are positioned by the same guide rod (guide rod 12). With this configuration, the outer shape of the zoom lens barrel 4 can be reduced in the radial direction (direction perpendicular to the optical axis).

[0068] Since both the movable lens frame 14 and the fixed lens frame 17 are positioned by the same guide rod (guide rod 12), relative positional deviation can be reduced with respect to the center of the zoom lens 13 and the center of the fixed lens 18. Thus, decentering accuracy, which is important for high image quality, can be improved.

[0069] Fig. 6A and Figure 6B1 is a diagram showing a state in which the hole portion 62 of the fixed lens frame 17 is arranged in the opening 64 of the sleeve portion 59 of the movable lens frame 14 . Fig. 6A 1 is a side view showing a state in which the hole portion 62 of the fixed lens frame 17 is arranged in the opening 64 of the sleeve portion 59 of the movable lens frame 14 . Figure 6B It is along Fig. 6A A cross-sectional view taken along line XX in FIG. Fig. 6A FIG. 14 is a diagram of the movable lens frame 14 viewed from the imaging surface side in the state. Specifically, Figure 6B 1 is a diagram (front view) showing a state in which the hole portion 62 of the fixed lens frame 17 is engaged with the opening 64 of the sleeve portion 59 of the movable lens frame 14 when viewed from the imaging surface side to the object side in the direction of the optical axis OA.

[0070] In this way, in the present embodiment, the hole portion 62 of the fixed lens frame 17 engages with the guide rod 12 while ensuring a clearance with the sleeve portion 59 so as not to interfere with the sleeve portion 59 of the movable lens frame 14 .

[0071] For this reason, even when the movable lens frame 14 moves in the direction of the optical axis OA, the movable lens frame 14 can move without interfering with the fixed lens frame 17. In this way, in the present embodiment, the position of the zoom lens 13 that changes the zoom magnification and the position of the movable lens frame 14 can be changed with a small relative position deviation, so that a high image quality zoom lens can be realized.

[0072] Figure 7 1 is a diagram showing a state in which the fixed lens frame 17 is fastened to the rear fixed frame 24 using screws (not shown). Specifically, the diagram shows a state in which the hole portion 62 of the fixed lens frame 17 is engaged with the opening 64 of the sleeve portion 59 of the movable lens frame 14. In addition, the diagram shows a state in which the lens assembly engaged with the guide rods 11 and 12 is further engaged with the rear fixed frame 24 and the fixed lens frame 17 is fastened to the rear fixed frame 24 using screws (not shown).

[0073] In this way, the fixed lens frame 17 is held at a fixed position relative to the rear fixed frame 24 , but the movable lens frame 14 is movable in the direction of the optical axis OA.

[0074] Fig. 8A and Figure 8B A state in which the zoom position of the movable lens frame 14 is at the WIDE end position is shown. Fig. 8A 1 is a diagram of the movable lens frame 14 viewed from the subject side. Figure 8B It is along Fig. 8A1 is a sectional view taken along line YY in FIG. 1 , and is an example of a side view showing a state where the zoom position of the movable lens frame 14 is at the WIDE end.

[0075] Fig. 9A and Fig. 9B 1 is a diagram showing a state where the zoom position of the movable lens frame 14 is at the TELE end. Fig. 9A 1 is a diagram of the movable lens frame 14 viewed from the subject side. Fig. 9B It is along Fig. 9A 1 is a cross-sectional view taken along line ZZ in FIG. 1 and shows an example of a side view of a state where the zoom position of the movable lens frame 14 is at the position of the TELE end. Fig. 8A , Figure 8B , Fig. 9A and Fig. 9B Components on the subject side including the front fixing frame 10 are omitted.

[0076] exist Fig. 8A and Figure 8B , the zoom position of the movable lens frame 14 engaged with the guide rod 11 and the guide rod 12 is maintained at the position of the WIDE end. The hole portion 62 of the fixed lens frame 17 inserted into (arranged in) the opening 64 of the sleeve portion 59 of the movable lens frame 14 is fixed to the rear fixed frame 24, so that the fixed lens frame 17 does not move in the direction of the optical axis OA. Even when the movable lens frame 14 moves in the direction of the optical axis OA, the hole portion 62 of the fixed lens frame 17 is arranged in the opening 64 of the sleeve portion 59 of the movable lens frame 14, so that the movable lens frame 14 and the fixed lens frame 17 do not interfere with each other.

[0077] exist Fig. 9A and Fig. 9B , the zoom position of the movable lens frame 14 engaged with the guide rods 11 and 12 is maintained at the position of the TELE end. The hole portion 62 of the fixed lens frame 17 inserted into (arranged in) the opening 64 of the sleeve portion 59 of the movable lens frame 14 is fixed to the rear fixed frame 24, so that the fixed lens frame 17 does not move in the direction of the optical axis OA. Even when the movable lens frame 14 moves in the direction of the optical axis OA, the hole portion 62 of the fixed lens frame 17 is arranged in the opening 64 of the sleeve portion 59 of the movable lens frame 14, so that the movable lens frame 14 and the fixed lens frame 17 do not interfere with each other.

[0078] In this way, when the movable lens frame 14 moves in the direction of the optical axis OA according to the zoom magnification, the hole portion 62 of the fixed lens frame 17 has been inserted into the opening 64 of the sleeve portion 59 of the movable lens frame 14. That is, because the hole portion 62 of the fixed lens frame 17 is located at a position straddling the sleeve portion 59 of the movable lens frame 14, interference between the movable lens frame 14 and the fixed lens frame 17 is avoided.

[0079] With this structure, the efficiency of the configuration space for the components is improved relative to the outer dimensions of the zoom lens barrel 4, and the zoom lens barrel 4 in the present embodiment can be made smaller in the radial direction. As described above, the movable lens frame 14 and the fixed lens frame 17 are engaged with the guide rod 12, so that the movable lens frame 14 and the fixed lens frame 17 are positioned in a plane perpendicular to the optical axis OA or in a direction perpendicular to the optical axis OA. For this reason, with the guide rod 12 as a reference, the relative position deviation between the two lens frames (the movable lens frame 14 and the fixed lens frame 17) can be suppressed.

[0080] Fig. 10A and Fig. 10B 1 is a diagram showing a state in which two guide rods, the fixed lens frame 17 , the aperture unit 16 , and the movable lens frame 14 are combined and then inserted into the rear fixed frame 24 , and the fixed lens frame 17 is fastened to the rear fixed frame 24 . Fig. 10A 1 is a diagram showing a state in which the guide rods 11 and 12, the fixed lens frame 17, the aperture unit 16, and the movable lens frame 14 are incorporated into the rear fixed frame 24. Fig. 10A and Fig. 10B In the embodiment, the fixed lens frame 17 is fastened to the rear fixed frame 24 using screws (not shown). Fig. 10B is along Fig. 10A The cross-sectional view is taken along the line SS in Fig. 10A FIG. 1 is a diagram of the movable lens frame 14 as viewed from the subject side in a state of FIG. Fig.11 yes Fig. 10B A partial enlarged view of P in .

[0081] Fig.11 The portion surrounded by the dotted line is the area where the first hole portion 60 and the second hole portion 61 through which the guide rod 12 of the movable lens frame 14 passes are located. Fig.11 As shown, a portion of the outer periphery of the outer portion 65 of the aperture unit 16 is inserted into the opening 64 of the sleeve portion 59 so as to overlap with the area where the first hole portion 60 and the second hole portion 61 through which the guide rod 12 of the movable lens frame 14 passes when viewed from the subject side along the direction of the optical axis OA.

[0082] In this manner, the outer portion 65 of the aperture unit 16 is arranged to be inserted into the opening 64 of the sleeve portion 59 provided in the movable lens frame 14 , and thus the size of the zoom lens barrel 4 in the radial direction can be further reduced.

[0083] Fig. 12A and Fig. 12B It shows that the rear fixing frame 24 has been Fig. 10A and Fig. 10B A diagram of the state shown with the state removed. Fig. 12A It shows that the rear fixing frame 24 has been Fig. 10A Example of a side view of the removed state. Fig. 12B yes Fig. 12A An example of a stereogram (component stereogram).

[0084] The wall portion 66 of the first hole portion 60 through which the guide rod 12 of the movable lens frame 14 is provided is indicated by a circular area indicated by a dotted line, which indicates an area corresponding to an extension of a lens holding portion that holds the zoom lens 13 .

[0085] As described above, the zoom lens barrel 4 in the present embodiment includes a light detector (not shown) such as a photointerrupter held by the rear fixed frame 24. A wing portion (plate portion, light shielding portion) 68 that shields light emitted from the light detector is provided near the second hole portion 61 through which the guide rod 12 of the movable lens frame 14 passes.

[0086] In the present embodiment, the wing 68 is a plate member that blocks light emitted from the photodetector. In this way, the photodetector can detect the position of the movable lens frame 14 using the wing 68.

[0087] The wing portion 68 and the wall portion 66 of the first hole portion 60 through which the guide rod 12 of the movable lens frame 14 is provided (which can be considered as a part of the first hole portion 60) are configured to span the outer portion 65 of the aperture unit 16. That is, when viewed in a direction perpendicular to the optical axis, the plate portion (wing portion 68) that blocks the light detector and a part of the hole portion 62 of the fixed lens frame 17 overlap each other.

[0088] With the above-described configuration, the efficiency of space is improved in the radial direction of the zoom lens barrel 4. In this way, in the present embodiment, both the movable lens frame 14 and the fixed lens frame 17 are positioned in a plane perpendicular to the optical axis OA or in a direction perpendicular to the optical axis with the same guide rod as a reference. Therefore, it is possible to suppress the relative positional deviation between two or more lens frames with the guide rod 12 as a reference, while reducing the size in the radial direction of the zoom lens barrel 4, and provide a high image quality zoom lens barrel.

[0089] As described above, in the present embodiment, it is possible to provide a zoom lens barrel (lens barrel) which is smaller than a lens barrel in the related art and has a structure capable of high-precision lens holding.

[0090] Although the preferred embodiments of the present invention have been described above using the examples and drawings, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist of the present invention.

[0091] While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

[0092] This application claims the benefit of Japanese Patent Application No. 2023-179364 filed on October 18, 2023, the entire contents of which are incorporated herein by reference.

Claims

1. A lens barrel, comprising: a first lens and a second lens; A first lens frame holding the first lens and a second lens frame holding the second lens; as well as a first guide rod supporting the first lens frame so that the first lens frame can move in the optical axis direction, wherein The first lens frame includes a sleeve portion including a first hole portion and a second hole portion engaged with the first guide rod and an opening portion formed between the first hole portion and the second hole portion, The second lens frame is provided with a third hole portion engaged with the first guide rod, and, When the first guide rod is engaged with the first hole portion and the second hole portion of the first lens frame and the third hole portion of the second lens frame, the first lens frame and the second lens frame are positioned in a direction perpendicular to the optical axis by the first guide rod, and the third hole portion of the second lens frame is arranged in the opening portion of the sleeve portion.

2. The lens barrel according to claim 1, further comprising a second guide rod, the second guide rod restricting the rotation of the first lens around the optical axis, in, The first lens frame and the second lens frame are positioned by the first guide rod in a state where rotation about an optical axis is restricted by the second guide rod.

3. The lens barrel according to claim 1, further comprising a second guide rod which restricts the rotation of the first lens around the optical axis, wherein The second lens frame is provided with a fourth hole portion engaged with the second guide rod, and, The rotation of the second lens frame around the optical axis is restricted by engaging the second guide rod with the fourth hole portion.

4. The lens barrel according to claim 1, wherein: The first hole portion of the first lens frame overlaps with the second hole portion and the third hole portion of the second lens frame when viewed in the optical axis direction.

5. The lens barrel according to claim 1, wherein: The first hole portion is arranged on the imaging surface side of the sleeve portion in the optical axis direction, and The second hole portion is provided on the subject side of the sleeve portion in the optical axis direction.

6. The lens barrel according to claim 1, further comprising: a second guide rod, which limits the rotation of the first lens around the optical axis; and A fixed frame holds the first guide rod and the second guide rod.

7. The lens barrel according to claim 1, further comprising an aperture unit fixed to the second lens frame, in, When the first guide rod is engaged with the first and second hole portions of the first lens frame and the third hole portion of the second lens frame, a portion of the aperture unit is inserted into the opening portion.

8. The lens barrel according to claim 1, further comprising a light detector for detecting a position of the first lens frame, in, The first lens frame is provided with a light shielding portion that shields light from the photodetector.

9. The lens barrel according to claim 8, wherein: The light shielding portion overlaps a portion of the third hole portion when viewed in a direction perpendicular to the optical axis.

10. A camera device, comprising: Image sensor; and The lens barrel according to claim 1.

Images