Optical equipment

Abstract

To provide an optical apparatus that has two lens barrels for correcting image blur and can be miniaturized.SOLUTION: An optical apparatus includes: a first lens barrel that holds a first optical system for correcting image blur; a second lens barrel that holds a second optical system for correcting the image blur; a base member that is disposed between the first lens barrel and the second lens barrel and supports the first lens barrel and the second lens barrel; a first drive portion that moves the first lens barrel in a direction orthogonal to an optical axis; a second drive portion that moves the second lens barrel in the direction orthogonal to the optical axis; a first damper member that is disposed between the first lens barrel and the base member; and a second damper member that is disposed between the second lens barrel and the base member. The first and second damper members are disposed at a position where at least parts of the damper members overlap each other when viewed from an optical axis direction.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to an optical device, and particularly to an optical device capable of correcting image blur.

Background Art

[0002] Conventionally, in order to prevent image blur caused by camera shake or the like, a device has been proposed that detects shake information of a camera or a lens device by shake detection means and cancels the shake optically or electronically according to the detection result to realize image blur correction. Further, in recent optical devices such as digital cameras, video cameras, and interchangeable lenses, with the increase in the opportunity to shoot videos, further improvement in image blur correction performance has been demanded. Among them, in order to improve the effect of image blur correction, there has been a conventional technique in which two lenses for image blur correction are mounted to expand the correction angle and improve optical performance.

[0003] For example, in Patent Document 1, there are a first and a second lens for image blur correction, and a technique is disclosed in which the second lens for image blur correction is moved in a direction orthogonal to the optical axis so as to correct the imaging position deviation that occurs when the first lens for image blur correction is moved in a direction orthogonal to the optical axis.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0005] However, in the conventional technique disclosed in Patent Document 1, since an anti-rotation mechanism and a damper mechanism are not mounted, depending on the relative relationship among the center of gravity of the moving group, the thrust of the driving device that moves the moving group, and the spring force of the spring member that holds the moving group centered, the moving group may rotate and oscillate. As a countermeasure against this oscillation, there is a first countermeasure of mounting an anti-rotation mechanism.

[0006] However, in a configuration with two image shake correction lenses, if an anti-rotation mechanism is also incorporated, the image shake correction device becomes larger in the optical axis direction, considering the two image shake correction lenses and the added size of the anti-rotation mechanism. A second solution is to incorporate a damper mechanism to simply prevent oscillation. In this case, following conventional technology, it would be necessary to arrange two damper mechanisms with a phase difference in the radial direction, raising concerns that the image shake correction device would become larger in diameter.

[0007] Therefore, the object of the present invention is to provide an optical instrument that has two lens barrels for correcting image shake and can be miniaturized. [Means for solving the problem]

[0008] To achieve the above objective, one aspect of the optical instrument of the present invention is: A first lens barrel holding a first optical system for correcting image shake, A second lens barrel holding a second optical system for correcting image shake, A base member positioned between the first lens barrel and the second lens barrel, supporting the first lens barrel and the second lens barrel, A first drive unit that moves the first lens barrel in a direction perpendicular to the optical axis, A second drive unit moves the second lens barrel in a direction perpendicular to the optical axis, A first damper member is disposed between the first lens barrel and the base member, The device comprises a second damper member positioned between the second lens barrel and the base member, The first damper member and the second damper member are characterized by being positioned so that at least a portion of them overlap when viewed from the optical axis direction. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide an optical instrument that has two lens barrels for correcting image shake and can be miniaturized. [Brief explanation of the drawing]

[0010] [Figure 1] This is a block diagram showing the electrical and optical configuration of the interchangeable lens 200 in Example 1 and the digital camera (hereinafter referred to as the camera body 100) to which the interchangeable lens 200 is detachably attached. [Figure 2] This is a view of the shift lens barrel 303a and the components mounted on the shift lens barrel 303a in Example 1, as seen from the image plane side (camera side). [Figure 3] This is a view of the shift barrel 303b and the components mounted on the shift barrel 303b in Example 1, as seen from the subject side (object side). [Figure 4] This is a view from the subject side of the base member 302 and the components mounted on the base member 302 in Example 1. [Figure 5] Figure 4 shows a cross-sectional view (AA) of the image shake correction unit 300 near gels 304ab and 304bb. [Figure 6] Figure 4 is a cross-sectional view of the image shake correction unit 300 near coils 301aa and 301ba. [Figure 7] Figure 4 is a cross-sectional view of the CC area near Hall elements 311aa and 311ba of the image shake correction unit 300. [Figure 8] This is a cross-sectional view of the image shake correction unit 300 near gels 304ab and 304bb in Example 2. [Figure 9] Figure 8 is a diagram illustrating the UV irradiation of gel 304ab. [Figure 10] Figure 8 is a view of the image plane (camera side). [Figure 11] This is a cross-sectional view of the area around coil 301aa and coil 301ba in Example 2. [Figure 12] This is a cross-sectional view of the image shake correction unit 300 in Example 2, near Hall IC 311ac and Hall IC 311bc. [Figure 13] This is a cross-sectional view of the image shake correction unit 300 according to Example 3, near gels 304ab and 304bb.

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described using examples with reference to the drawings. However, the present invention is not limited to the following examples. In each figure, the same members or elements are given the same reference numerals, and redundant descriptions are omitted or simplified. In addition, in this embodiment, an interchangeable lens will be described as an example of an optical device. However, the present invention can also be applied to other lens-integrated cameras, cameras mounted on moving bodies such as vehicles, drones, and robots, and various modifications and changes are possible within the scope of the gist of the present invention.

Example

[0012] Hereinafter, an interchangeable lens having an image blur correction device according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a functional block diagram showing the electrical and optical configurations of an interchangeable lens 200 in Embodiment 1 and a digital camera (hereinafter referred to as a camera body 100) to which the interchangeable lens 200 is detachably attached.

[0013] In addition, some of the functional blocks shown in FIG. 1 are realized by causing a CPU as a computer (not shown) included in a camera control unit 107 of an optical device to execute a computer program stored in a memory as a storage medium (not shown). However, some or all of them may be realized by hardware. As the hardware, a dedicated circuit (ASIC), a processor (reconfigurable processor, DSP), or the like can be used.

[0014] Furthermore, each of the functional blocks shown in FIG. 1 does not have to be built in the same housing, and may be constituted by separate devices connected via signal paths to each other. Furthermore, the CPU, which is built into the camera control unit 107, functions as a control means that controls the operation of each part of the camera body 100 and interchangeable lens 200 based on computer programs stored in the memory, which is a storage medium.

[0015] In this embodiment, the optical axis direction is defined as the X-axis direction, and the directions perpendicular to it are defined as the Z-axis direction (horizontal direction) and the Y-axis direction (vertical direction). The rotation direction around the Z-axis is defined as the pitch direction, and the rotation direction around the Y-axis is defined as the yaw direction.

[0016] The camera body 100 includes a power supply unit 110 that supplies power to the camera body 100 and the interchangeable lens 200, and an operation unit 108 that includes a power operation unit (not shown), a shooting mode dial, a shutter release button, a rear operation unit, and a touch panel function for the display unit 105. The system, including the camera body 100 and the interchangeable lens 200, is controlled by the cooperation of a camera control unit 107 provided in the camera body 100 and a lens control unit 203 provided in the interchangeable lens 200.

[0017] The camera control unit 107 communicates with the lens control unit 203 via a communication terminal of an electrical contact 204 provided on a lens mount (not shown), which provides various control signals and data. The electrical contact 204 includes a power terminal that supplies power from the power supply unit 110 to the interchangeable lens 200. Details about the camera body 100 will be described later.

[0018] The interchangeable lens 200 is mechanically and electrically connected to the mount on the camera body 100 via a lens mount (not shown). The interchangeable lens 200 houses an imaging optical system, such as a lens, that focuses light from the subject to form an image of the subject.

[0019] The interchangeable lens 200 has a zoom operation ring 201 on its outer circumference that can be rotated around the optical axis by user operation to change the angle of view of the imaging optical system. The interchangeable lens 200 also has a zoom detection unit 202 that detects the angle of the zoom operation ring 201. The zoom detection unit 202 detects the angle of the zoom operation ring 201 operated by the user as an absolute value and is configured, for example, using a resistive linear potentiometer.

[0020] When the zoom operation ring 201 is rotated by the user, the information regarding the angle of view detected by the zoom detection unit 202 is transmitted to the lens control unit 203. As a result, the zoom lens group 205 moves in the optical direction to a predetermined specified position corresponding to the angle of the zoom operation ring 201, within the range from the wide-angle end to the telephoto end of the zoom lens group 205. In this way, the user can take pictures at the desired angle of view.

[0021] Furthermore, the information regarding the field of view detected by the zoom detection unit 202 is reflected in various controls performed by the camera control unit 107. On the other hand, some of this information is recorded along with the captured image in the storage unit 113 or a recording medium (not shown).

[0022] The interchangeable lens 200 further includes an image shake correction unit 300 which includes a shift lens as an image shake correction element, and an image shake correction drive unit 301 for driving the image shake correction unit 300. The image shake correction unit 300 has shift lenses 306a and 306b as image shake correction elements, and the image shake correction drive unit 301 reduces image shake by moving (shifting) these image shake correction elements in the Y and Z axis directions which are orthogonal to the optical axis (X axis). Alternatively, the optical system may be configured to reduce image shake by tilting it with respect to the optical axis.

[0023] Furthermore, the interchangeable lens 200 includes an aperture group 400 that performs light intensity adjustment and an aperture drive unit 401 that drives the aperture group 400. Furthermore, the interchangeable lens 200 has a focus group 500 that includes a focus lens that moves in the optical axis direction to adjust the focus. The outer circumference of the interchangeable lens 200 is provided with a focus ring (not shown) that can be rotated about the optical axis by user operation.

[0024] When the focus ring is rotated by the user, the rotation detection unit detects the amount of rotation of the focus ring and drives the focus drive unit 501 via the lens control unit 203, causing the focus group 500 to move in the optical axis direction (X axis direction). By moving the focus group 500 along the optical axis, the focus can be adjusted, allowing the user to take pictures at the desired focus.

[0025] The camera body 100 includes a shutter unit 101, a shutter drive unit 102, an image sensor 103, an image processing unit 104, a display unit 105, an operation unit 108, an accessory shoe 109, a power supply unit 110, and a camera control unit 107. Furthermore, it includes a pitch shake detection unit 111, a yaw shake detection unit 112, and a memory unit 113.

[0026] The shutter unit 101 controls the amount of light received by the image sensor 103 via the imaging optical system in the interchangeable lens 200 and the exposure time. The image sensor 103 converts the subject image formed by the imaging optical system into an image signal and outputs an image processing signal. The image processing unit 104 performs various image processing on the image processing signal and then generates an image signal. The display unit 105 displays the image signal (through image) output from the image processing unit 104, displays shooting parameters, and plays back and displays the image recorded in the storage unit 113 or a recording medium (not shown).

[0027] The camera control unit 107 controls the focus drive unit 501 in response to shooting preparation operations on the operation unit 108 (such as half-pressing the shutter release button). The focus detection unit 106 determines the focus state of the subject image formed by the image sensor 103 based on, for example, the contrast of the image signal generated by the image processing unit 104, generates a focus signal, and transmits it to the camera control unit 107. At the same time, the focus drive unit 501 transmits information regarding the current position of the focus group 500 to the camera control unit 107.

[0028] The camera control unit 107 compares the focus state of the subject image with the current position of the focus group 500, calculates the focus drive amount from the amount of deviation, and transmits it to the lens control unit 203. The lens control unit 203 then moves the focus group 500 to the target position in the optical axis direction via the focus drive unit 501, thereby correcting the focus deviation of the subject image.

[0029] The focus drive unit 501 includes a focus motor and a position detection unit for detecting the position of the focus group 500. Generally, a stepping motor, which is a type of actuator, is often used as the focus motor. In this case, since the stepping motor can only control the relative amount of drive, a photointerrupter is used to move the focus group 500 to the origin position and perform the origin detection process.

[0030] Furthermore, a DC motor equipped with an encoder, an ultrasonic motor, or a voice coil motor may be used as the actuator. In addition, while a photointerrupter directly receives light emitted from a light-emitting part with a light-receiving part, a photoreflector that receives reflected light from a reflective surface or a brush that detects a signal electrically by contacting a conductive pattern may be used instead.

[0031] Furthermore, the camera control unit 107 controls the driving of the aperture group 400 and the shutter unit 101 via the aperture drive unit 401 and the shutter drive unit 102, according to the aperture value and shutter speed settings received from the operation unit 108. For example, when automatic exposure control is instructed, the camera control unit 107 receives the luminance signal generated by the image processing unit 104 and performs photometering calculations.

[0032] Based on the photometric calculation results, the camera control unit 107 controls the aperture drive unit 401 in response to shooting instruction operations on the operation unit 108 (such as fully pressing the release button). At the same time, the camera control unit 107 controls the drive of the shutter unit 101 via the shutter drive unit 102 and performs exposure processing by the image sensor 103.

[0033] The pitch shake detection unit 111 and the yaw shake detection unit 112 each use an angular velocity sensor (vibration gyro) and an angular acceleration sensor to detect image shake in the pitch direction (rotational direction around the Z axis) and yaw direction (rotational direction around the Y axis), respectively, and output shake signals. The camera control unit 107 uses the shake signals from the pitch shake detection unit 111 to calculate the shift position in the Y axis direction of the image shake correction elements (shift lenses 306a and 306b) of the image shake correction unit 300.

[0034] Similarly, the camera control unit 107 uses the yaw shake detection unit 112 to calculate the shift position of the image shake correction elements (shift lenses 306a and 306b) of the image shake correction unit 300 in the Z-axis direction. Then, the camera control unit 107 moves the image shake correction elements (shift lenses 306a and 306b) of the image shake correction unit 300 to the target position in the Y / Z axis direction via the image shake correction drive unit 301 according to the calculated pitch / yaw direction shift position. By moving the image shake correction elements (shift lenses 306a and 306b) to the target position, image shake during through-image display during exposure is reduced.

[0035] Next, the configuration of the image shake correction unit 300 will be explained in detail using Figures 2 to 7. Figure 2 shows the shift lens barrel 303a and the components mounted on the shift lens barrel 303a in Example 1, viewed from the image plane side (camera side). Figure 3 shows the shift barrel 303b and the components mounted on the shift barrel 303b in Example 1, viewed from the subject side (object side).

[0036] Figure 4 is a view of the base member 302 and the components mounted on the base member 302 in Example 1, as seen from the subject side. Figure 5 is a cross-sectional view (AA) of the image shake correction unit 300 near gels 304ab and 304bb in Figure 4. Figure 6 is a cross-sectional view of the BB area near coils 301aa and 301ba of the image shake correction unit 300 in Figure 4. Figure 7 is a cross-sectional view of the CC area near Hall elements 311aa and 311ba of the image shake correction unit 300 in Figure 4.

[0037] As shown in Figures 2 to 7, the image shake correction unit 300 of this embodiment is equipped with two image shake correction elements (shift lens 306a and shift lens 306b). Each image shake correction element is held by a shift lens barrel 303a and a shift lens barrel 303b, and image shake correction is performed by moving the shift lens barrel 303a and a shift lens barrel 303b in the Y-axis and Z-axis directions, respectively.

[0038] Here, the shifting lens barrel 303a functions as a first lens barrel that holds a first optical system (shift lens 306a) for correcting image shake. The shifting lens barrel 303b functions as a second lens barrel that holds a second optical system (shift lens 306b) for correcting image shake. A base member 302 is positioned between the first and second lens barrels, and the base member 302 supports both the first and second lens barrels.

[0039] By using two image stabilization elements to correct image stabilization, a larger correction angle can be obtained compared to using one element, thereby improving the image stabilization effect. Since the basic configuration of the shift tube 303a is the same as that of the shift tube 303b, we will mainly describe one side of the shift tube 303a, and omit the explanation of the overlapping configuration in the shift tube 303b.

[0040] The image shake correction unit 300 includes an image shake correction drive unit 301 that moves the shift lens barrel 303a and the shift lens barrel 303b respectively, and a position detection unit that detects the positions of each. The image shake correction drive unit 301 uses a voice coil motor. Coils 301aa and 301ab are arranged in the shift lens barrel 303a at a 90° angle when viewed from the camera side, as shown in Figure 2, and the two coils are bonded and fixed to the shift lens barrel 303a.

[0041] Specifically, two coils are fixed to the shift tube 303a using, for example, a UV-curing adhesive. A predetermined gap is provided between the two coils and the base member 302 in the X-axis (optical axis) direction, and the drive magnets 301c, 301d, 301e, and 301f are arranged on the base member 302 so as to face each of the two coils.

[0042] Therefore, for example, when current is passed through coil 301aa, thrust is generated in the Y-axis direction according to Fleming's left-hand rule, and the shift tube 303a can be moved in the Y-axis direction. Similarly, when current is passed through coil 301ab, the shift tube 303a can also be moved in the Z-axis direction. The shift tube 303b can also be moved in the Y-axis and Z-axis directions using the image shake correction drive unit 301, similar to the shift tube 303a.

[0043] Here, coils 301aa and 301ab, along with drive magnets 301c, 301d, 301e, and 301f, function as a first drive unit that moves the first telescope tube in a direction perpendicular to the optical axis. Coils 301ba and 301bb, along with drive magnets 301c, 301d, 301e, and 301f, function as a second drive unit that moves the second telescope tube in a direction perpendicular to the optical axis. Furthermore, drive magnets 301c to 301f function as a common drive unit for the first and second drive units.

[0044] Thus, in this embodiment, a base member 302 is placed between the shift lens barrel 303a and the shift lens barrel 303b, and the first drive unit and the second drive unit are arranged so that at least a portion of them overlap when viewed along the optical axis of the interchangeable lens. Therefore, as shown in Figure 6, it is possible to share a part of the image shake correction drive unit 301 (drive magnets 301c to 301f). That is, by placing drive magnets 301c, 301d and 301e, 301f on the base member 302, they can be shared as a common drive unit, thus allowing for a miniaturization of the overall configuration.

[0045] The range of movement of the shifting lens barrel 303a is physically restricted by its mechanical end. As shown in Figure 5, the range of movement is restricted by the contact between the mechanical end 303ae on the shifting lens barrel 303a side and the mechanical end 302ae on the base member 302 side. The same applies to the shifting lens barrel 303b. The range of movement restricted by this mechanical end is wider than the optically required range of movement.

[0046] The amount of movement of the shift lens barrel 303a is calculated by the camera control unit 107 from the amount of camera shake, the optical specifications (focal length) of the interchangeable lens 200, the relationship between the amount of movement of the shift lens 306a and the image shake correction amount, and the position information of the shift lens 306a in the Z-axis / Y-axis direction. Based on the aforementioned information, the camera control unit 107 calculates the amount of movement of the shift lens barrel 303a necessary to reduce image shake caused by camera shake, etc., and sets this calculated value as the target value.

[0047] Furthermore, as mentioned above, the amount of shake, such as camera shake, is detected in the pitch direction (rotation direction around the Z axis) and yaw direction (rotation direction around the Y axis) using an angular velocity sensor (vibration gyro) and an angular acceleration sensor. In addition, the relationship between the amount of movement of the shift lens 306a and the amount of image shake correction is optical design information.

[0048] Furthermore, the Z-axis / Y-axis position of the shift lens 306a is detected, for example, using a Hall element and a sensor magnet as magnetic sensors. Specifically, Hall elements 311aa and 311ab (see Figure 2) are placed in the shift lens barrel 303a. Then, a gap is provided in the X-axis direction between the two Hall elements, and four sensor magnets are placed on the base member 302 so as to face each of the two Hall elements.

[0049] As shown in Figure 4, the four sensor magnets are sensor magnet 311c, sensor magnet 311d, sensor magnet 311e, and sensor magnet 311f, each fixed to the base member 302 with adhesive. Alternatively, the sensor magnets may be insert-molded into the base member 302.

[0050] The Hall element 311aa is held in a predetermined position in the detection direction by the Hall element holder 303aa, and is biased by the Hall element holder 303ab of the double-supported beam to prevent displacement in the detection direction. The double-supported beam may be changed to a single-supported beam, and biasing may be applied with a weaker force. Also, as shown in Figure 2, the Hall element 311ab is positioned at a phase rotated 90° relative to the Hall element 311aa and is held by the shifting lens barrel 303a in a similar manner.

[0051] Furthermore, in this embodiment, as described above, the drive magnet, which is part of the image shake correction drive unit 301, is shared as a common drive unit, and part of the position detection unit (sensor magnet) is also shared between the first and second lens barrels, thus enabling further miniaturization.

[0052] Specifically, as shown in Figure 7, the sensor magnets 311c and 311d, and the sensor magnets 311e and 311f shown in Figure 4, are used interchangeably as Hall elements for magnetic sensors in the shift lens barrel 303a and the shift lens barrel 303b. Note that 312a and 312b are flexible substrates.

[0053] The camera control unit 107 calculates the amount of movement required to move the shift lens barrel 303a from the difference between the aforementioned target value and the position information of the shift lens barrel 303a. Based on the calculated amount of movement, the lens control unit 203 drives the shift lens barrel 303a to the target position via the image shake correction drive unit 301.

[0054] Furthermore, as shown in Figure 2, three balls (rolling balls 307aa, 307ab, and 307ac) are sandwiched between the base member 302 and the shifting lens barrel 303a, determining the position and tilt of the shifting lens barrel 303a in the X-axis direction relative to the base member 302. In addition, the shifting lens barrel 303a is biased in the +X-axis direction relative to the base member 302 by tension springs 308aa (Figure 6) and 308ab (Figure 5), and the three balls are sandwiched by the biasing force of these tension springs.

[0055] The two tension springs (tension spring 308aa and tension spring 308ab) are attached to the spring attachment parts 303af and 303ag on the shifting lens barrel 303a (Figure 2) and to the spring attachment parts 302ac and 302ad on the base member 302 (Figure 4), respectively. The spring biasing force of the tension springs holds the shifting lens barrel 303a in place from the base member 302. As shown in Figure 2, the spring attachment parts 303af and 303ag are positioned such that the angle between the optical axis and the line segment connecting each attachment part is 180°. In other words, the spring attachment parts 303af and 303ag are positioned at opposite phases with respect to the optical axis.

[0056] In this embodiment, damper members are placed between the shift lens barrel 303a and the base member 302, and between the shift lens barrel 303b and the base member 302, as countermeasures against vibration damping and rotation prevention issues of the shift lens barrel of the image shake correction unit 300. Furthermore, this embodiment employs a configuration suitable for miniaturization in order to mount these damper members.

[0057] Specifically, as shown in Figure 2, gels 304aa and 304ab are positioned in the shifting tube 303a at opposite ends of the optical axis, and gel pins 302aa and 302ab, as shown in Figure 4, are inserted into the two gels, respectively, and fixed to them. The gel pins are positioned to protrude from the base member 302, and a reaction force is generated by the gel pins when the shifting tube 303a moves along the Z-axis / Y-axis. Here, gels 304aa and 304ab function as a first damper member positioned between the first tube and the base member. Also, gel pins 302aa and 302ab function as receiving parts for the first damper.

[0058] Furthermore, gel pins 302ba (not shown) and 302bb (shown in Figure 5) are positioned at the same phase on the image plane side (camera side) of gel pins 302aa and 302ab, which are located on the subject side of the base member 302, so as to protrude from the base member 302. Gel pins 302ba and 302bb are then inserted into gels 304ba and 304bb, respectively. Here, gels 304ba and 304bb function as second damper members positioned between the second lens barrel and the base member. Gel pins 302ba and 302bb also function as receiving parts for the second damper.

[0059] Thus, in this embodiment, the first damper member and the second damper member are mounted on the first lens barrel and the second lens barrel, respectively, and the receiving portion for the first damper and the receiving portion for the second damper are provided on the base member 302.

[0060] The gel is positioned as shown in Figure 2 to suppress oscillation of the image shake correction unit 300 and rotation (rolling) of the shifting lens barrel 303a when the shifting lens barrel 303a moves along the Z-axis / Y-axis. However, it may be positioned in a different location depending on the characteristics of oscillation and rotation. A photocurable resin is used as the gel; for example, UV-curable silicone gel is used.

[0061] Furthermore, in this embodiment, in order to prevent the gel from flowing out before hardening, gel sheets 305aa (not shown) and 305ab (shown in Figure 5) are installed on gels 304aa and 304ab of the shift barrel 303a, respectively. Here, gel sheets 305aa and 305ab function as first damper sheets.

[0062] Regarding the gel configuration and arrangement, the shifting lens barrel 303b has the same configuration as the shifting lens barrel 303a. As mentioned above, since the phase of the image shake correction drive unit 301 and the position detection unit are the same, the gels 304ba and 304bb in Figure 3 have the same phase as the gels 304aa and 304ab in Figure 2.

[0063] Furthermore, to prevent gel leakage, gel sheet 305ba (not shown) and gel sheet 305bb in Figure 5 are similarly positioned in the same phase as gel sheet 305aa and gel sheet 305ab. Here, gel sheet 305ba and gel sheet 305bb function as second damper sheets, and the first damper sheet and the second damper sheet are each positioned on opposite sides of the base member 302.

[0064] Thus, when viewed from the subject side (X-axis direction), gel 304aa in Figure 2 and gel 304ba in Figure 3 are in the same phase and overlap. Similarly, gel 304ab in Figure 2 and gel 304bb in Figure 3 are in the same phase and overlap. In other words, the first damper member and the second damper member are positioned so that at least a portion of them overlap when viewed from the optical axis direction. Therefore, the device can be miniaturized. Furthermore, since gel pins 302ba and 302bb are positioned on the back side (image plane side) with the same phase as gel pins 302aa and 302ab, the device can be further miniaturized.

[0065] Furthermore, UV (ultraviolet) irradiation to cure the gel is performed using the UV irradiator 313, irradiating from both the subject side and the image plane side, as shown in Figure 5. The gel sheets (305aa, 305ab, 305ba, 305bb) transmit at least the ultraviolet light irradiated from the UV irradiator 313. Therefore, there are no shapes between the UV irradiator 313 and the gel that obstruct the UV irradiation path, and the generation of outgassing due to incomplete curing of the gel can be suppressed.

[0066] According to this embodiment, in an interchangeable lens 200 equipped with two image shake correction elements, the degree of freedom in gel placement can be increased by arranging gels on both shifting lens barrels with the base member 302 in between, thereby enabling miniaturization. Furthermore, miniaturization can be further achieved by matching the phase of the gel pins.

[0067] Furthermore, by placing the gel on both sides of the shift barrel, it is possible to suppress uncured gel during UV irradiation, which also helps to address the problem of lens fogging due to outgassing caused by uncured gel. As a result, it is possible to provide an optical instrument that achieves both improved image shake correction and a smaller diameter, while also providing high reliability against lens fogging caused by outgassing. [Examples]

[0068] Next, with reference to Figures 8 to 12, a replacement lens having an image shake correction device according to Embodiment 2 of the present invention will be described. Figure 8 is a cross-sectional view of the image shake correction unit 300 near gels 304ab and 304bb in Example 2. In Example 2, the gels for the shift tube 303a are referred to as gels 304aa and 304ab, as in Example 1, and the gels for the shift tube 303b are referred to as gels 304ba and 304bb, as in Example 1.

[0069] However, in Embodiment 2, gels 304aa and 304ab are positioned on the base member 302 opposite the shifting lens barrel 303a. Also, gels 304ba and 304bb are positioned on the base member 302 opposite the shifting lens barrel 303b. Conversely, the gel pins inserted into gels 304aa and 304ab are provided on the shifting lens barrel 303a side, and the gel pins inserted into gels 304ba and 304bb are provided on the shifting lens barrel 303b side.

[0070] Specifically, the first damper member and the second damper member are each provided on the base member 302, and the receiving portion for the first damper member and the receiving portion for the second damper member are each provided on the first lens barrel and the second lens barrel.

[0071] Figure 9 is a diagram illustrating the UV irradiation of gel 304ab in Figure 8. Figure 10 is a view of Figure 8 from the image plane side (camera side). Figure 11 is a cross-sectional view of the vicinity of coils 301aa and 301ba in Example 2. Figure 12 is a cross-sectional view of the vicinity of Hall ICs 311ac and 311bc of the image shake correction unit 300 in Example 2.

[0072] In Example 2, a configuration is adopted in which lens 317 is positioned between two image shake correction elements (shift lens 306a, shift lens 306b), as shown in Figure 8. Lens 317 is held by base member 302. Holding methods include heat crimping, adhesive bonding, and retaining ring holding.

[0073] In Example 2, as described above, the gel is placed on the base member 302. The shift tubes 303a and 303b, and the gels 304aa, 304ab, 304ba, and 304bb, which suppress oscillation of each, are placed on the base member 302. As shown in Figure 8, gels 304ab and 304bb are placed on the base member 302, offset in the direction of the optical axis. Furthermore, gels 304ab and 304bb are placed in the same phase when viewed from the subject side (X-axis direction), and the two gels are placed so as to overlap.

[0074] A gel sheet 305ab is placed between the two gels (gel 304ab and gel 304bb) to suppress the outflow of gel before it hardens. Gel pins 303al and 303bl are inserted into the two gels (gel 304ab and gel 304bb) from the shift tube 303a and shift tube 303b, respectively, so that they can receive the gel reaction force when the shift tube moves.

[0075] By offsetting two gels (gel 304ab and gel 304bb) on the base member 302 in the direction of the optical axis and arranging them in the same phase when viewed along the optical axis, one gel sheet can be eliminated, making it possible to shorten the overall length of the image shake correction unit 300 in the direction of the optical axis.

[0076] In Example 2, for gel curing, first, as shown in Figure 9, without the shift barrel 303b and gel 304bb, gel 304ab is placed on gel sheet 305ab and gel 304ab, and gel 304ab is cured with UV irradiator 313. Gel sheet 305ab transmits at least the ultraviolet light irradiated from UV irradiator 313. Therefore, as in Example 1, there is virtually no concern about the gel remaining uncured.

[0077] On the other hand, since a portion of the shift tube 303b forms a wall for the gel 304bb, uncuring can be suppressed by installing three notches 303bm in the shift tube 303b as shown in Figure 10 and irradiating each notch 303bm with UV light. Alternatively, a transparent section may be provided instead of the notches 303bm.

[0078] Furthermore, in Embodiment 2, as shown in Figure 11, the image shake correction drive unit 301 increases the magnetic force by placing drive magnets facing each other and arranging coils 301aa and 301ba between them. In addition, the efficiency of the magnetic circuit is improved by providing a yoke.

[0079] Specifically, as shown in Figure 11, the coil 301aa is arranged so as to be sandwiched between the drive magnets 301c and 301d, and the drive magnets 301ac and 301ad.

[0080] Furthermore, the drive magnets 301ac and 301ad are magnetically attached to a yoke 314a, which reduces leakage flux and improves the efficiency of the magnetic circuit. By providing the image shake correction drive unit 301 with such opposing magnet configuration, high thrust can be achieved, and the power consumption of the image shake correction unit 300 can be reduced. Alternatively, it can accommodate an increase in the mass of the shift lens 306a.

[0081] In the aforementioned opposing magnet configuration, for example, a strong magnetic attraction force acts between the drive magnet 301c and the drive magnet 301ac. By positioning the yoke shaft 315aa between the yoke 314a and the receiving member 316 so that this magnetic attraction force is received by the receiving member 316, a metal member, rather than the resin base member 302, deformation of the base member 302 due to the magnetic attraction force is prevented.

[0082] The yoke shaft 315aa is made of, for example, brass. The opposite yoke 314b is similarly supported by the yoke shaft 315ba. By arranging three yoke shafts in a balanced manner for each yoke, the tilting of the yoke and fluctuations in the gap between the magnet and the coil are suppressed.

[0083] In Example 2, a Hall IC is used for the position detection unit of the shift lens barrel. Specifically, as shown in Figure 12, a sensor magnet 311c is placed on the base member 302, and a Hall IC 311ac is placed on the shift lens barrel 303a to detect the position of the shift lens barrel 303a in the Y-axis and Z-axis directions. The sensor magnet 311c is also positioned to face the Hall IC 311bc placed on the opposite shift lens barrel 303b, so it can be used interchangeably with the Hall IC 311bc.

[0084] Furthermore, 303ah and 303ai are Hall IC holders for holding Hall IC 311ac, and 303bh and 303bi are Hall IC holders for holding Hall IC 311bc.

[0085] According to this embodiment, in an interchangeable lens 200 equipped with two image shake correction elements, the gels 304ab and 304bb on the base member 302 are offset in the optical axis direction and arranged in the same phase when viewed along the optical axis, thereby eliminating one gel sheet. Consequently, the overall length of the image shake correction unit 300 in the optical axis direction can be shortened. Furthermore, by providing a notch 303bm in the shift barrel 303b, UV irradiation of the gel 304bb is possible, preventing it from remaining uncured.

[0086] Furthermore, by employing an opposing magnet configuration, high thrust can be achieved, reducing the power consumption of the image shake correction unit 300. Alternatively, it can accommodate an increase in the mass of the shift lens 306a. Therefore, it is possible to achieve both improved image shake correction effectiveness and a shorter overall length, while also suppressing lens fogging problems due to outgassing, thus providing a highly reliable optical instrument. [Examples]

[0087] Next, with reference to Figure 13, an interchangeable lens having an image shake correction device according to Embodiment 3 of the present invention will be described. Figure 13 is a cross-sectional view of the image shake correction unit 300 according to Embodiment 3, near gels 304ab and 304bb. In Embodiment 3, the image shake correction drive unit 301 is further miniaturized by changing the position where the tension spring is attached compared to Embodiment 1.

[0088] As shown in Figure 13, a spring hook portion 310ab is provided on the cover member 310a, and a spring hook portion 310bb is provided on the cover member 310b, and a tension spring 308ab is attached to both spring hook portions. As a result, both cover members are spring-biased in the direction in which the tension spring 308ab is compressed.

[0089] Three balls (rolling balls 307ad, 307ae, and 307af) are positioned between the shifting lens barrel 303a and the cover member 310a. Additionally, three balls (rolling balls 307bd, 307be, and 307bf) are positioned between the shifting lens barrel 303b and the cover member 310b.

[0090] In this configuration, the cover member 310a is biased to prevent it from separating from the base member 302, so the shift lens barrel 303a is also biased in the X-axis direction via rolling balls to prevent it from separating from the base member 302. On the other hand, since no biasing force acts in the Y-axis and Z-axis directions, the image shake correction drive unit 301 can be miniaturized.

[0091] Furthermore, the spring hook portion 310aa and tension spring 308bb, which are not shown, are positioned approximately 180° in phase with respect to the spring hook portion 310ab and tension spring 308ab, with respect to the optical axis.

[0092] According to this embodiment, when the shift lens barrel moves (shifts) in the Y-axis and Z-axis directions, the spring biasing force of the tension spring in the Y-axis and Z-axis directions does not act, so it is not necessary to add that spring biasing force to the thrust of the drive unit. Therefore, the image shake correction drive unit 301 can be miniaturized and power consumption can be reduced.

[0093] Although the present invention has been described in detail above based on preferred embodiments, the present invention is not limited to the above embodiments, and various modifications are possible based on the spirit of the invention, and these modifications are not excluded from the scope of the present invention. Furthermore, the configurations of the above embodiments 1 to 3 may be combined as appropriate. Furthermore, the disclosure of this embodiment includes the following: (Composition 1) A first lens barrel holding a first optical system for correcting image shake, A second lens barrel holding a second optical system for correcting image shake, A base member positioned between the first lens barrel and the second lens barrel, supporting the first lens barrel and the second lens barrel, A first drive unit that moves the first lens barrel in a direction perpendicular to the optical axis, A second drive unit moves the second lens barrel in a direction perpendicular to the optical axis, A first damper member is disposed between the first lens barrel and the base member, The device comprises a second damper member positioned between the second lens barrel and the base member, An optical device characterized in that the first damper member and the second damper member are positioned so that at least a portion of them overlap when viewed from the direction of the optical axis. (Configuration 2) The first damper member and the second damper member are mounted on the first lens barrel and the second lens barrel, respectively. The optical device according to configuration 1, characterized in that the receiving portion for the first damper member and the receiving portion for the second damper member are provided on the base member. (Composition 3) The first damper member and the second damper member are each provided with a first damper sheet and a second damper sheet, respectively. The optical device according to configuration 1 or 2, characterized in that the first damper sheet and the second damper sheet are each arranged on opposite sides of the base member. (Composition 4) The optical instrument according to any one of configurations 1 to 3, characterized in that the first drive unit and the second drive unit include a common drive unit, and the common drive unit is provided on the base member. (Composition 5) The optical device according to configuration 4, characterized in that the common drive unit is a magnet. (Composition 6) The optical instrument according to any one of configurations 1 to 5, characterized in that the first drive unit and the second drive unit overlap in at least a portion when viewed from the direction of the optical axis. (Composition 7) The first damper member and the second damper member are each provided on the base member, The optical instrument according to configuration 1, characterized in that the receiving portion for the first damper member and the receiving portion for the second damper member are provided in the first lens barrel and the second lens barrel, respectively. (Composition 8) The first lens barrel and the second lens barrel are each equipped with a magnetic sensor. The optical device according to any one of configurations 1 to 7, characterized in that a common sensor magnet is provided on the base member. (Composition 9) The optical instrument according to any one of configurations 1 to 8, characterized in that the first damper member and the second damper member each contain gel. (Composition 10) The optical device according to configuration 9, characterized in that it has gel pins inserted into the gel of the first damper member and the second damper member, respectively. (Composition 11) The optical instrument according to configuration 9 or 10, characterized in that the gel contains a photocurable resin. [Explanation of symbols]

[0094] 100...Camera body 103...Image sensor 200... Interchangeable lenses 201... Zoom control ring 301aa...coil 301ab...coil 301c... Drive Magnet 301d... Drive Magnet 301e... Drive Magnet 301f... Drive Magnet 301ba...coil 301bb...coil 302...Base component 303a····Shifting Telescope Tube 303b... Shift-shifted telescope tube 304aa····gel 304ab····gel 304ba····gel 304bb····gel 306a····Shift lens 306b····Shift lens

Claims

1. A first lens barrel holding a first optical system for correcting image shake, A second lens barrel holding a second optical system for correcting image shake, A base member positioned between the first lens barrel and the second lens barrel, supporting the first lens barrel and the second lens barrel, A first drive unit that moves the first lens barrel in a direction perpendicular to the optical axis, A second drive unit that moves the second lens barrel in a direction perpendicular to the optical axis, A first damper member is disposed between the first lens barrel and the base member, The device comprises a second damper member positioned between the second lens barrel and the base member, An optical device characterized in that the first damper member and the second damper member are positioned so that at least a portion of them overlap when viewed from the direction of the optical axis.

2. The first damper member and the second damper member are mounted on the first lens barrel and the second lens barrel, respectively. The optical device according to claim 1, characterized in that the receiving portion for the first damper member and the receiving portion for the second damper member are provided on the base member.

3. The first damper member and the second damper member are each provided with a first damper sheet and a second damper sheet, respectively. The optical device according to claim 1, characterized in that the first damper sheet and the second damper sheet are each arranged on opposite sides of the base member.

4. The optical device according to claim 1, characterized in that the first drive unit and the second drive unit include a common drive unit, and the common drive unit is provided on the base member.

5. The optical device according to claim 4, characterized in that the common drive unit is a magnet.

6. The optical device according to claim 1, characterized in that the first drive unit and the second drive unit overlap in at least a portion when viewed from the optical axis direction.

7. The first damper member and the second damper member are each provided on the base member, The optical instrument according to claim 1, characterized in that the receiving portion for the first damper member and the receiving portion for the second damper member are provided in the first lens barrel and the second lens barrel, respectively.

8. The first lens barrel and the second lens barrel are each equipped with a magnetic sensor. The optical device according to claim 1, characterized in that a common sensor magnet is provided on the base member.

9. The optical instrument according to any one of claims 1 to 8, characterized in that the first damper member and the second damper member each contain gel.

10. The optical instrument according to claim 9, characterized in that the gel contains a photocurable resin.

Images