Optical Machines

Abstract

To provide an optical apparatus with which an increase in size attributable to the arrangement of circuit components is suppressed.SOLUTION: Provided is an optical apparatus comprising a lens barrel 550, a lens, a lens holding frame for holding the lens, a guide member for guiding the lens holding frame in the direction of the optical axis, an actuator for driving the lens holding frame in the direction of the optical axis, and a circuit component for supplying electric power to the actuator. The lens holding frame and the guide member are arranged inward of the outer circumference of the lens barrel, and the circuit component and the actuator are arranged so as to overlap in part in the direction of the optical axis when each of these are projected from a direction orthogonal to the optical axis to the optical axis. At least a portion of the circuit component is arranged within a range where the lens holding frame is movable in the direction of the optical axis.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to optical instruments. [Background technology]

[0002] Some optical devices such as digital cameras, video cameras, and interchangeable lenses are equipped with vibration actuators (ultrasonic motors) as driving devices for various drive mechanisms in order to achieve high speed and quiet autofocus functions. The driving power source for the vibration actuator requires circuit components such as a step-up transformer that boosts the voltage supplied from a battery or the like and applies a predetermined AC voltage to the vibration actuator.

[0003] However, it is known that leakage flux from the step-up transformer causes magnetic noise, and when such magnetic noise is superimposed on the imaging signal, the image quality of the image is degraded. Therefore, for example, Patent Document 1 discloses a drive device in which a step-up unit is arranged in a position different from the holding board on which the control unit and the switching unit are mounted, and the step-up unit and the vibration actuator are arranged close to each other. With this configuration, it is possible to shorten the wiring of the high-voltage drive signal flowing between the step-up unit and the vibration actuator, thereby making it possible to reduce the impact of induced noise and leakage flux on the imaging element. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-179787 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the driving device described in Patent Document 1, the step-up transformer is disposed outside the cam barrel, which is the driven body. Since the step-up transformer has a magnetic circuit such as a coil inside, the external shape is generally relatively large for a circuit component. Therefore, if the step-up transformer is disposed outside the cam barrel, there is a risk that the diameter of the entire lens barrel including the cam barrel will become large.

[0006] An object of the present invention is to provide an optical device capable of suppressing an increase in size due to the arrangement of circuit components. [Means for solving the problem]

[0007] The optical device according to the present invention includes a linear guide barrel that guides a zoom lens group in an optical axis direction, a lens barrel arranged on an inner circumference side of the linear guide barrel, a lens holding frame that holds a focus lens, a guide member that guides the lens holding frame in the optical axis direction, an actuator that drives the lens holding frame in the optical axis direction, and a power supply to the actuator. Step-up transformer and a flexible printed wiring board on which the lens holding frame and the guide member are mounted, the lens holding frame and the guide member being disposed inside the outer periphery of the lens barrel, and all components of the actuator being disposed inside the outer periphery of the lens barrel and disposed in a space between an inner circumferential surface of the linear guide barrel and a side surface of the lens barrel when viewed from the optical axis direction. Step-up transformer is disposed in a space between the inner peripheral surface of the linear guide barrel and the side surface of the lens barrel when viewed from the optical axis direction, and is disposed in the optical axis direction when viewed from a direction perpendicular to the optical axis. Step-up transformer is arranged on a side surface of the barrel so as to overlap a portion of the actuator. Effect of the Invention

[0008] According to the present invention, it is possible to provide an optical device in which an increase in size due to the arrangement of circuit components is suppressed. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view of the appearance of a digital single-lens reflex camera according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a block diagram showing the electrical and optical configurations of the camera body and the interchangeable lens. [Diagram 3] 1 is a cross-sectional view showing a schematic configuration of a digital single-lens reflex camera with an interchangeable lens in a retracted state. [Figure 4] 1 is a cross-sectional view showing a schematic configuration of a digital single-lens reflex camera with an interchangeable lens extended. [Diagram 5] FIG. 2 is an exploded perspective view of a focus group unit arranged in the interchangeable lens. [Figure 6] FIG. 2 is a side view of the focus group unit. [Figure 7] FIG. 11 is a cross-sectional view showing a state in which the focus group is disposed at an end of its range of movement. [Figure 8] 2 is a cross-sectional view of the interchangeable lens taken along a plane perpendicular to the optical axis. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, a so-called digital single-lens reflex camera will be taken as an optical device according to the present invention, but the present invention is not limited to this. FIG. 1 is an external perspective view of a digital single-lens reflex camera 100 according to an embodiment of the present invention, with FIG. 1(a) being a view from the front side and FIG. 1(b) being a view from the rear side. The digital single-lens reflex camera 100 comprises a camera body 1 and an interchangeable lens 101 (lens barrel) that is detachable from the camera body 1.

[0011] For ease of explanation, the X-axis direction is defined as parallel to the optical axis of the imaging optical system (not shown) housed in the interchangeable lens 101, as shown in Fig. 1. When the X-axis is parallel to the horizontal direction, the direction perpendicular to the X-axis in the horizontal plane is defined as the Z-axis direction, and the direction parallel to the vertical direction is defined as the Y-axis 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.

[0012] Inside the camera body 1, there is provided an imaging element 16 (see FIG. 2) that photoelectrically converts (captures) a subject image formed by an imaging optical system in the interchangeable lens 101. On the left side of the camera body 1 when the digital single-lens reflex camera 100 is viewed from the front side, there is provided a grip section 2 for a user to hold the camera body 1 with his / her hand. On the top surface of the camera body 1, there are provided a power operation section 3, a mode dial 4, a release button 5, and an accessory shoe 6. The power operation section 3 switches the power of the camera body 1 between an on state and an off state. The imaging mode is switched according to the rotation operation of the mode dial 4. The imaging modes include a manual still image imaging mode in which imaging conditions such as a shutter speed and an aperture value can be arbitrarily set, an auto still image imaging mode in which an appropriate exposure amount is automatically obtained, and a video imaging mode for capturing videos, which are just a few examples. When the release button 5 is half-pressed, a camera control section 12 (see FIG. 2) built into the camera body 1 starts imaging preparation operations such as autofocus and auto exposure control. When the release button 5 is fully pressed, the camera control unit 12 executes an image capturing operation. The accessory shoe 6 allows attachment and detachment of accessories such as an external strobe device and an external viewfinder device (EVF).

[0013] The interchangeable lens 101 is mechanically and electrically connected to a camera mount 7 provided on the camera body 1 via a lens mount 102. An imaging optical system that forms an image of light from a subject on an imaging element 16 is housed inside the interchangeable lens 101. A zoom ring 103 that can rotate around an optical axis is provided on the outer periphery of the interchangeable lens 101. The outer periphery of the zoom ring 103 is formed in a knurled shape so that the user's hand does not slip when rotating the zoom ring 103. When the zoom ring 103 is rotated, a zoom group that constitutes the imaging optical system in the interchangeable lens 101 moves to an optical position corresponding to the rotation angle of the zoom ring 103, and the imaging angle of view changes.

[0014] The rear surface of the camera body 1 is provided with a rear surface operation section 8 and a display section 9. The rear surface operation section 8 includes a plurality of buttons and dials to which various functions are assigned. The display section 9 displays a through image of the subject image captured by the image sensor 16, a playback image when the captured image is played back, a menu for setting various operating conditions of the digital single-lens reflex camera 100, and the like.

[0015] 2 is a block diagram showing the electrical and optical configurations of the camera body 1 and the interchangeable lens 101. The camera body 1 has an accessory shoe 6, a display unit 9, a power supply unit 10, an operation unit 11, a camera control unit 12, a storage unit 13, a shutter unit 14, a shutter drive unit 15, an image sensor 16, an image processing unit 17, and a focus detection unit 18. The interchangeable lens 101 has a zoom operation ring 103, a lens control unit 104, electrical contacts 105, a zoom detection unit 106, a first zoom group 201, a lens vibration isolation group 301, a vibration isolation drive unit 302, an aperture 401, an aperture drive unit 402, a focus group 501, and a focus drive unit 502. Note that the same reference numerals are used to designate common elements between FIG. 1 and FIG. 2, and explanations of elements already explained with reference to FIG. 1 will be omitted here.

[0016] The power supply unit 10 supplies power to the camera body 1 and the interchangeable lens 101. The operation unit 11 includes a power operation unit 3, a mode dial 4, a release button 5, a rear operation unit 8, and a touch panel function of the display unit 9. The shutter unit 14 controls the amount of light (exposure) that passes through the imaging optical system in the interchangeable lens 101 and is irradiated onto the imaging element 16. The imaging element 16 is specifically a CMOS sensor or the like, and photoelectrically converts the subject image formed by the imaging optical system to output an imaging signal. The image processing unit 17 generates an image signal (image data) by performing various image processing on the imaging signal. The generated image data is stored in the storage unit 13. The focus detection unit 18 uses the image signal generated by the image processing unit 17 to determine the focus state of the subject image formed on the imaging element 16, generates a focus signal, and transmits it to the camera control unit 12.

[0017] The camera control unit 12 comprehensively controls the operation of each block provided in the camera body 1. Furthermore, the lens control unit 104 comprehensively controls the operation of each block provided in the interchangeable lens 101. The overall operation of the digital single-lens reflex camera 100 is controlled by mutual communication between the camera control unit 12 and the lens control unit 104. At that time, the camera control unit 12 and the lens control unit 104 communicate various control signals, data, and the like via a communication terminal of an electrical contact 105 provided in the lens mount 102 and a communication terminal of an electrical contact provided in the camera mount 7. Note that the electrical contact 105 includes a power supply terminal that supplies power from the power supply unit 10 to the interchangeable lens 101.

[0018] The storage unit 13 stores computer programs executed by the camera control unit 12, parameters necessary for executing the computer programs, and also stores captured images (still image data, moving image data). The camera control unit 12 reads out and executes the computer programs stored in the storage unit 13.

[0019] The pitch shake detection unit 19 and the yaw shake detection unit 20 detect image shake such as camera shake. The pitch shake detection unit 19 and the yaw shake detection unit 20 detect image shake in the pitch direction (rotation direction around the Z axis) and the yaw direction (rotation direction around the Y axis) using an angular velocity sensor (vibration gyro) and an angular acceleration sensor (not shown), respectively, and output a shake detection signal. The camera control unit 12 calculates the shift position of the lens vibration isolation group 301 in the Y axis direction using the shake detection signal from the pitch shake detection unit 19. Similarly, the camera control unit 12 calculates the shift position of the lens vibration isolation group 301 in the Z axis direction using the shake signal from the yaw shake detection unit 20. The camera control unit 12 drives the lens vibration isolation group 301 to a target position according to the calculated shift positions in the pitch direction and the yaw direction, and performs a shake isolation operation to reduce image shake during exposure or during through image display.

[0020] The first zoom group 201, the lens vibration isolation group 301, and the focus group 501 constitute an imaging optical system in the interchangeable lens 101. Details of the imaging optical system of the interchangeable lens 101 will be described later. The first zoom group 201 is connected to the zoom operation ring 103, and moves in the optical axis direction according to the rotation angle of the zoom operation ring 103, thereby changing the imaging angle of view.

[0021] The zoom detection unit 106 is configured using, for example, a resistive linear potentiometer, and detects the rotation angle of the zoom operation ring 103 as an absolute value. Information about the angle of view detected by the zoom detection unit 106 is transmitted to the lens control unit 104, and then transmitted from the lens control unit 104 to the camera control unit 12, and used for various controls by the camera control unit 12. A part of the information about the angle of view is stored in the storage unit 13 together with the captured image.

[0022] The lens vibration-proof group 301 includes a shift lens as a vibration-proof element that reduces image blur. The vibration-proof driving unit 302 performs vibration-proof operation to reduce image blur by displacing (shifting) the shift lens in the Z-axis direction and the Y-axis direction perpendicular to the optical axis. The aperture group 401 adjusts the amount of light passing through the imaging optical system. The aperture driving unit 402 drives the aperture group 401. The focus group 501 includes a focus lens 510 (see FIG. 5) that is arranged so as to be movable in the optical axis direction. The focus driving unit 502 performs focus adjustment (focusing operation) by moving the focus lens 510 in the optical axis direction. The focus driving unit 502 is composed of a vibration actuator (described later) that moves the focus lens 520 in the optical axis direction, and a driving circuit for driving the vibration actuator.

[0023] In the digital single-lens reflex camera 100, the camera control unit 12 controls the driving of the shutter unit 14 via the shutter driving unit 15 in response to the aperture value and shutter speed instructed from the operation unit 11. In addition, the lens control unit 104 controls the driving of the aperture group 401 via the aperture driving unit 402. When the camera control unit 12 detects an image capture preparation operation (half-press operation) on the operation unit 11 (release button 5), the lens control unit 104 controls the focus driving unit 502 based on an instruction from the camera control unit 12 to drive the focus group 501. For example, when an autofocus operation is instructed, the focus detection unit 18 detects the defocus amount based on the image signal generated by the image processing unit 17 and transmits the detected defocus amount to the camera control unit 12. At the same time, the lens control unit 104 detects the current position of the focus group 501 by the focus driving unit 502 and transmits the detection signal to the camera control unit 12.

[0024] The camera control unit 12 calculates a focus drive amount (amount of movement of the focus group 501) from the amount of deviation between the focus state of the subject image and the current position of the focus group 501, and transmits the calculated focus drive amount to the lens control unit 104. The lens control unit 104 controls the focus drive unit 502 according to the received focus drive amount to move the focus group 501 to the target position. This corrects the focus deviation of the subject image. When an automatic exposure control operation is instructed, the camera control unit 12 performs a photometry calculation based on a luminance signal generated by the image processing unit 17, and controls the drive of the aperture group 401 according to an image capture instruction operation (full press operation) of the operation unit 11 (release button 5) based on the photometry calculation result. At the same time, the camera control unit 12 controls the drive of the shutter unit 14 via the shutter drive unit 15, and performs exposure processing by the image sensor 16.

[0025] Next, the positional relationship between the interchangeable lens 101 and the components in the camera body 1 will be described. Figures 3 and 4 are cross-sectional views showing the schematic configuration of the digital single-lens reflex camera 100, taken along a section that includes the optical axis O of the interchangeable lens 101 and is parallel to the Y axis. In Figure 3, the interchangeable lens 101 is in a retracted state, and in Figure 4, the interchangeable lens is in an extended state. Note that, of the elements shown in Figures 3 and 4, elements that have already been described with reference to Figures 1 or 2 are given the same reference numerals, and description of these will be omitted.

[0026] The imaging optical system has a first zoom group 201, a second zoom group 202, a third zoom group 203, a fourth zoom group 204, a sixth zoom group 206, a lens vibration isolation group 301, a focus group 501, and an aperture group 401. The aperture group 401 and the lens vibration isolation group 301 function as a third zoom group, and the focus group 501 functions as a fifth zoom group. Each zoom group moves to a predetermined optical position according to the angle of view, and forms an image of light from a subject on the imaging surface of the image sensor 16.

[0027] In this example, the imaging optical system of the interchangeable lens 101 is configured with six groups, but the configuration of the imaging optical system is not limited to this. For example, the lens vibration isolation group 301 and the focus group 501 may function as a second zoom group, and some of the lens groups may be fixed in the optical axis direction (X-axis direction).

[0028] The interchangeable lens 101 has a rectilinear guide tube 107 and a cam tube 108. The rectilinear guide tube 107 and the cam tube 108 are made of a conductive material, specifically a metal material, and as will be described in detail later, this makes it possible to reduce the influence of magnetic noise generated in the focus drive unit 502 on the image sensor 16. The rectilinear guide tube 107 is fixed to the lens mount 102 via a fixed tube (not shown). Bayonet claws (not shown) are arranged at equal intervals on the outer circumferential surface of the rectilinear guide tube 107. The cam tube 108 is arranged on the outer circumferential side of the rectilinear guide tube 107 and is connected to the zoom operation ring 103, and is held so as to be rotatable around the optical axis. In addition, a circumferential groove (not shown) that engages with the bayonet claw of the rectilinear guide tube 107 is provided on the inner circumferential surface of the cam tube 108. Since the bayonet claws are engaged with the inside of the circumferential groove, when the zoom operation ring 103 is rotated, the cam tube 108 rotates around the optical axis.

[0029] The linear guide barrel 107 has linear guide grooves for linearly moving each zoom group in the optical axis direction while restricting rotation. On the other hand, the cam barrel 108 has cam grooves for moving each zoom group in the optical axis direction, the cam grooves being at a predetermined angle with respect to the rotation direction of the cam barrel 108. Each of the first to sixth zoom groups has a cam follower, and each cam follower is engaged with the corresponding linear guide groove and cam groove. When the zoom operation ring 103 is rotated, the cam barrel 108 rotates, and the cam followers provided in each zoom group move within the linear guide grooves provided in the linear guide barrel 107 and the cam grooves provided in the cam barrel 108, so that each zoom group advances and retreats in the optical axis direction.

[0030] Next, the configuration of the focus group unit including the focus group 501 will be described. FIG. 5 is an exploded perspective view of the focus group unit 500. The focus group unit 500 has a lens barrel 550, and the focus group 501 is housed inside the lens barrel 550. The focus group 501 includes a focus lens 510 and a focus lens holding frame 520 that holds the focus lens 510. The focus lens holding frame 520 has a sleeve portion and a vibration prevention portion. The sleeve portion is slidably fitted with a main guide 560 (first guide member) arranged substantially parallel to the optical axis O, and the vibration prevention portion is slidably fitted with a sub-guide 570 (second guide member) arranged substantially parallel to the main guide 560. The axial ends of the main guide 560 and the sub-guide 570 are supported by the lens barrel 550 and the sixth group holding frame 206b. The sixth group holding frame 206b holds the sixth group lens 206a. In this way, the focus lens holding frame 520 is supported between the lens barrel 550 and the six-group holding frame 206b so as to be able to move smoothly in the optical axis direction, while being positioned in the Y-axis direction and the Z-axis direction by the main guide 560 and the sub-guide 570.

[0031] The lens barrel 550 is connected to the sixth group holding frame 206b by a main guide 560 and a sub guide 570. As described above, each zoom group can move in the optical axis direction by the engagement between the cam barrel 108 and the linear guide barrel 107, so the lens barrel 550 can move linearly in the optical axis direction integrally with the sixth zoom group 206 (see FIGS. 3 and 4).

[0032] A linear drive type vibration actuator 507 is mounted on the side (outer peripheral surface) of the lens barrel 550 as an actuator constituting a part of the focus drive unit 502. The vibration actuator 507 has a long axis in the optical axis direction, and is provided with a movable part 508 having a vibrating body, and a fixed part 509 having a contact body (friction member). The vibrating body has an elastic body having a frictional contact part (protrusion part) with the contact body, and a piezoelectric element fixed with an adhesive or the like to the surface of the elastic body opposite to the surface on which the frictional contact part is provided. A flexible printed wiring board 580 that supplies power to the piezoelectric element is attached to the lens barrel 550, and various circuit components for driving the vibrating body are mounted on the flexible printed wiring board 580. Note that the internal structure of the vibration actuator 507 is not directly related to the present invention, so a detailed description thereof will be omitted.

[0033] A two-phase AC voltage having a predetermined phase difference is applied to the piezoelectric element through the flexible printed wiring board 580, thereby causing a resonance phenomenon in the vibrator and generating an elliptical motion in the frictional contact portion. The elliptical motion generated in the frictional contact portion causes the frictional contact portion to apply a thrust force (frictional driving force) to the contact portion, and in the vibration actuator 507, the reaction force that the frictional contact portion receives from the contact portion causes the movable portion 508 having the vibrator to move in the optical axis direction.

[0034] The fixed part 509 is fixed to the lens barrel 550. The movable part 508 is connected to the focus lens holding frame 520 via a rack 530 (connecting member), and therefore the movable part 508 and the focus lens holding frame 520 move together in the optical axis direction. At this time, the direction of rotation of the elliptical motion and the elliptical ratio can be changed by changing the frequency and phase of the two-phase AC voltage applied to the piezoelectric element, thereby controlling the direction and speed of movement of the movable part 508. The lens control unit 104 can control the traveling wave generated in the vibration body, and can move the focus group 501 in the optical axis direction to reach the target position.

[0035] The circuit components mounted on the flexible printed wiring board 580 to supply power to the piezoelectric element include a step-up transformer 590. Step-up transformer 590 is one of the electrical components constituting the focus driver 502, and generates a voltage higher than the voltage supplied to the lens control unit 104 to supply power to the piezoelectric element. The drive circuit constituting the focus driver 502, for example, switches a DC voltage circuit using a pulse signal generated at a predetermined frequency, and boosts the switched voltage using the step-up transformer 590 to generate a sine wave voltage to be applied to the piezoelectric element. However, the configuration of the focus driver 502 is not limited to this configuration.

[0036] Step-up transformer 590 generates magnetic noise. When the magnetic noise reaches image sensor 16, a magnetic field that changes at high frequency passes through the signal line for pixel charge information that extracts the image signal. This generates magnetism due to electromagnetic induction in the signal line, which results in noise in the signal line for pixel charge information. If magnetic noise is thus superimposed on the image signal during the process in which image sensor 16 generates and outputs the image signal, it may cause degradation of image quality.

[0037] An arrangement of focus group unit 500 that can solve this problem and also realize a reduction in the diameter of interchangeable lens 101 will be described below. FIG. 6 is a side view of focus group unit 500. FIG. 7(a) is a cross-sectional view showing a state in which focus group 501 is arranged at one end of movement range MR. FIG. 7(b) is a cross-sectional view showing a state in which focus group 501 is arranged at the other end of movement range MR. FIG. 8 is a cross-sectional view of interchangeable lens 101 in a plane perpendicular to optical axis O.

[0038] 8, when viewed from the optical axis direction, barrel 550 is disposed on the inner periphery side of linear guide barrel 107, and has a generally cylindrical shape that follows the inner diameter of linear guide barrel 107. Focus lens holding frame 520, main guide 560, and sub-guide 570 are disposed inside the outer periphery of barrel 550 (the circumscribed circle of barrel 550 centered on the optical axis).

[0039] Step-up transformer 590 and vibration actuator 507 are arranged on the outer peripheral side surface of barrel 550 so as not to protrude outward from the outer periphery of barrel 550 (the circumscribing circle of barrel 550 centered on the optical axis) when viewed from the optical axis direction as shown in Fig. 8. Meanwhile, focusing on the position of step-up transformer 590 in the optical axis direction, step-up transformer 590 is arranged on the outer peripheral side surface of barrel 550 at a position where at least a part of it overlaps with vibration actuator 507 in the optical axis direction as shown in Fig. 6. In other words, step-up transformer 590 and vibration actuator 507 are arranged so as to overlap when each is projected onto the optical axis from a direction perpendicular to the optical axis.

[0040] 7(a) and 7(b), at least a part of the step-up transformer 590 is disposed within a range in which the focus group 501 can move while being guided by the main guide 560 and the sub guide 570, that is, within a moving range MR. Focusing on the circumferential phase of the step-up transformer 590, the main guide 560, and the sub guide 570, the step-up transformer 590 is disposed at a phase that avoids the vibration actuator 507, the main guide 560, and the sub guide 570 in the circumferential direction, as shown in FIG.

[0041] In this way, in the interchangeable lens 101, the vibration actuator 507 and the step-up transformer 590 are arranged by effectively utilizing the space in the optical axis direction and the circumferential direction of the lens barrel 550. This makes it possible to suppress the increase in diameter (upsizing) of the interchangeable lens 101 or to reduce the diameter (downsizing) of the interchangeable lens 101. In addition, since the cam barrel 108 and the linear guide barrel 107 are made of a metal material, it is possible to reduce the magnetic flux leaking from the outer periphery. In other words, the magnetic flux generated by the step-up transformer 590 tries to pass through metal, which is a conductor, and if a change in magnetic flux density occurs in the process, an eddy current is generated by electromagnetic induction. As a result, the magnetic flux penetrating the cam barrel 108 and the linear guide barrel 107 is reduced, making it possible to reduce the effect of magnetic noise on the image sensor 16, thereby making it possible to suppress deterioration in image quality.

[0042] Although the present invention has been described in detail above based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the gist of the present invention are also included in the present invention. Furthermore, each of the above-mentioned embodiments merely shows one embodiment of the present invention, and each embodiment can be appropriately combined. For example, in the above embodiment, the imaging optical system of the interchangeable lens 101 is configured as a six-group configuration, but the present invention is not limited to this. [Explanation of symbols]

[0043] 1 Camera body 100 Digital SLR Camera 101 Interchangeable Lenses 107 Straight guide tube 108 Cam barrel 500 focus group units 501 Focus Group 502 Focus drive unit 507 Vibration Actuator 520 Focus lens holding frame 550 Telescope tube 560 Main Guide 570 Sub Guide 590 Step-up transformer

Claims

1. a linear guide barrel that guides the zoom lens group in the optical axis direction; a lens barrel disposed on the inner peripheral side of the linear guide barrel; a lens holding frame for holding a focus lens; a guide member that guides the lens holding frame in the optical axis direction; an actuator that drives the lens holding frame in the optical axis direction; a flexible printed wiring board mounted with a step-up transformer for supplying power to the actuator, the lens holding frame and the guide member are disposed inside the outer periphery of the lens barrel, all components of the actuator are disposed inside the outer periphery of the barrel, and are disposed in a space between an inner periphery of the linear guide barrel and a side surface of the barrel when viewed from the optical axis direction, an optical device characterized in that the step-up transformer mounted on the flexible printed wiring board is disposed in a space between an inner surface of the linear guide tube and a side surface of the lens barrel when viewed from the optical axis direction, and is disposed on the side surface of the lens barrel so that a portion of the step-up transformer overlaps with the actuator in the optical axis direction when viewed from a direction perpendicular to the optical axis.

2. 2. The optical device according to claim 1, wherein the linear guide barrel is made of a conductive material.

3. A cam barrel is provided which is rotatable around an optical axis, 3. The optical device according to claim 1, wherein the cam barrel is disposed on an outer circumferential side of the linear guide barrel.

4. 4. The optical device according to claim 3, wherein the lens barrel is movable in the optical axis direction in accordance with rotation of the cam barrel due to engagement between the cam barrel and the linear guide barrel.

5. 5. The optical device according to claim 3, wherein the cam barrel is made of a conductive material.

6. 6. The optical device according to claim 1, wherein the actuator is a vibration type actuator having a vibrating body and a contact body that comes into contact with the vibrating body.

7. The vibration actuator includes: a movable portion that holds the vibrating body and is connected to the lens holding frame; a fixing portion to which the contact body is fixed and which is attached to the lens barrel; 7. The optical device according to claim 6, wherein the lens holding frame and the movable portion move integrally in the optical axis direction by a reaction force generated when the vibrating body exerts a thrust on the contact body.

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