JP7618733B2 - Optical Instruments - Google Patents

Description

The present invention relates to optical equipment.

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

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 placed in a position different from the holding board on which the control unit and switching unit are mounted, and the step-up unit and the vibration actuator are placed close to each other. With this configuration, it is possible to shorten the wiring for the high-voltage drive signal flowing between the step-up unit and the vibration actuator, thereby reducing the impact of induced noise and leakage flux on the imaging element.

JP 2013-179787 A

However, in the drive device described in Patent Document 1, the step-up transformer is placed outside the cam barrel, which is the driven body. Step-up transformers have a magnetic circuit such as a coil inside, and therefore generally tend to have a relatively large external size for a circuit component. Therefore, placing the step-up transformer outside the cam barrel could result in the entire lens barrel, including the cam barrel, becoming larger in diameter.

The present invention aims to provide an optical device that can suppress the increase in size caused by the arrangement of circuit components.

The optical device of the present invention is an optical device comprising a linear guide tube that guides a zoom lens group in the optical axis direction, a barrel arranged on the inner side of the linear guide tube, 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 flexible printed wiring board mounted with a step-up transformer that supplies power to the actuator, wherein the lens holding frame and the guide member are arranged inside the outer periphery of the barrel, all of the components of the actuator are arranged inside the outer periphery of the barrel and are arranged in the space between the inner surface of the linear guide tube and the side of the barrel when viewed from the optical axis direction, and the step-up transformer mounted on the flexible printed wiring board is arranged in the space between the inner surface of the linear guide tube and the side of the barrel when viewed from the optical axis direction, and is arranged on the side of the 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.

The present invention provides an optical device that reduces the size caused by the arrangement of circuit components.

1 is a perspective view of the appearance of a digital single-lens reflex camera according to an embodiment of the present invention; FIG. 2 is a block diagram showing the electrical and optical configurations of the camera body and the interchangeable lens. 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. 1 is a cross-sectional view showing a schematic configuration of a digital single-lens reflex camera with an interchangeable lens extended. FIG. 2 is an exploded perspective view of a focus group unit arranged in the interchangeable lens. FIG. 2 is a side view of the focus group unit. 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. 2 is a cross-sectional view of the interchangeable lens taken along a plane perpendicular to the optical axis.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Here, a so-called digital single-lens reflex camera will be taken as an example of 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, Fig. 1(a) is a view from the front side, and Fig. 1(b) is 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.

For ease of explanation, as shown in FIG. 1, 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. 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.

Inside the camera body 1, there is an image sensor 16 (see FIG. 2) that photoelectrically converts (captures) the subject image formed by the 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 a grip section 2 for the user to hold the camera body 1 with his/her hand. On the top surface of the camera body 1, there are 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 on and off. 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 the imaging conditions such as the shutter speed and the aperture value can be set arbitrarily, an auto still image imaging mode in which the appropriate exposure amount is automatically obtained, and a video imaging mode for video imaging, but these are only examples. When the release button 5 is half-pressed, the camera control section 12 (see FIG. 2) built into the camera body 1 starts imaging preparation operations such as autofocus and automatic exposure control. When the release button 5 is fully pressed, the camera control unit 12 executes an image capture operation. The accessory shoe 6 allows the attachment and detachment of accessories such as an external strobe device or an external viewfinder device (EVF).

The interchangeable lens 101 is mechanically and electrically connected to the camera mount 7 provided on the camera body 1 via the lens mount 102. An imaging optical system that focuses light from a subject on the image sensor 16 is housed inside the interchangeable lens 101. A zoom ring 103 that can rotate around the 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, the 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.

The rear side of the camera body 1 is provided with a rear side operation section 8 and a display section 9. The rear side operation section 8 includes a number 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, and menus for setting various settings such as the operating conditions of the digital single-lens reflex camera 100.

2 is a block diagram showing the electrical and optical configuration 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 memory 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, an electrical contact 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 for elements common to both FIG. 1 and FIG. 2, and elements already described with reference to FIG. 1 will not be described here.

The power supply unit 10 supplies power to the camera body 1 and the interchangeable lens 101. The operation unit 11 includes the power operation unit 3, the mode dial 4, the release button 5, the rear operation unit 8, and the 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 memory 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.

The camera control unit 12 comprehensively controls the operation of each block provided in the camera body 1. 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, etc. via a communication terminal of the electrical contact 105 provided in the lens mount 102 and a communication terminal of the electrical contact provided in the camera mount 7. The electrical contact 105 includes a power terminal that supplies power from the power supply unit 10 to the interchangeable lens 101.

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

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 yaw direction, and performs an anti-shake operation to reduce image shake during exposure and during through image display.

The first zoom group 201, the lens vibration reduction group 301, and the focus group 501 constitute the imaging optical system of 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.

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, where it is used for various controls by the camera control unit 12. A portion of the information about the angle of view is stored in the memory unit 13 together with the captured image.

The lens vibration reduction group 301 includes a shift lens as a vibration reduction element that reduces image blur. The vibration reduction drive unit 302 performs vibration reduction 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 drive 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 drive unit 502 performs focus adjustment (focusing operation) by moving the focus lens 510 in the optical axis direction. The focus drive unit 502 is composed of a vibration actuator (described later) that moves the focus lens 520 in the optical axis direction, and a drive circuit for driving the vibration actuator.

In the digital single-lens reflex camera 100, the camera control unit 12 controls the driving of the shutter unit 14 via the shutter drive unit 15 according 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 drive 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 drive unit 502 based on the instruction of 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 drive unit 502 and transmits the detection signal to the camera control unit 12.

The camera control unit 12 calculates the focus drive amount (the movement amount of the focus group 501) from the deviation amount 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 the luminance signal generated by the image processing unit 17, and controls the drive of the aperture group 401 according to the 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.

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 general 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 and 2 are given the same reference numerals, and descriptions of these will be omitted.

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 the third zoom group, and the focus group 501 functions as the 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 the subject on the imaging surface of the image sensor 16.

Note that, although the imaging optical system of the interchangeable lens 101 here has a six-group configuration, 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).

The interchangeable lens 101 has a linear guide tube 107 and a cam tube 108. The linear 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 effect of magnetic noise generated by the focus drive unit 502 on the image sensor 16. The linear 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 peripheral surface of the linear guide tube 107. The cam tube 108 is arranged on the outer peripheral side of the linear guide tube 107 and is connected to the zoom operation ring 103, and is held rotatably around the optical axis. In addition, a circumferential groove (not shown) that engages with the bayonet claw of the linear guide tube 107 is provided on the inner peripheral 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.

The linear guide tube 107 has linear guide grooves for moving each zoom group in the optical axis direction while restricting rotation. On the other hand, the cam tube 108 has cam grooves for moving each zoom group in the optical axis direction, which are formed at a predetermined angle with respect to the rotation direction of the cam tube 108. Each of the first to sixth zoom groups has a cam follower, and each cam follower engages with the corresponding linear guide groove and cam groove. When the zoom operation ring 103 is rotated, the cam tube 108 rotates, and the cam followers provided in each zoom group move within the linear guide grooves provided in the linear guide tube 107 and the cam grooves provided in the cam tube 108, causing each zoom group to advance and retreat in the optical axis direction.

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 stored 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 approximately parallel to the optical axis O, and the vibration prevention portion is slidably fitted with a sub-guide 570 (second guide member) arranged approximately 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 6-group holding frame 206b. The 6-group holding frame 206b holds the 6-group lens 206a. In this way, the focus lens holding frame 520 is supported between the lens barrel 550 and the sixth group holding frame 206b so that it can 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.

The lens barrel 550 is connected to the sixth group holding frame 206b by the main guide 560 and the sub-guide 570. As described above, each zoom group can move in the optical axis direction due to 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 together with the sixth zoom group 206 (see Figures 3 and 4).

A linear drive type vibration actuator 507 is mounted on the side (outer peripheral surface) of the lens barrel 550 as an actuator constituting part of the focus drive unit 502. The vibration actuator 507 has a long axis in the optical axis direction, and is equipped 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 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 will be omitted.

By applying a two-phase AC voltage with a predetermined phase difference to the piezoelectric element through the flexible printed wiring board 580, a resonance phenomenon can be caused in the vibrator, causing elliptical motion in the frictional contact area. The elliptical motion caused in the frictional contact area causes the frictional contact area to apply a thrust force (frictional driving force) to the contact body, and in the vibration actuator 507, the reaction force that the frictional contact area receives from the contact body causes the movable part 508 having the vibrator to move in the optical axis direction.

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), so that the movable part 508 and the focus lens holding frame 520 move together in the optical axis direction. At this time, by changing the frequency and phase of the two-phase AC voltage applied to the piezoelectric element, the rotation direction and elliptical ratio of the elliptical motion can be changed, and the moving direction and moving speed of the movable part 508 can be controlled. The lens control unit 104 can control the traveling wave generated in the vibrating body, and can move the focus group 501 in the optical axis direction to reach the target position.

The circuit components mounted on the flexible printed wiring board 580 to supply power to the piezoelectric element include a step-up transformer 590. The 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 with a pulse signal generated at a predetermined frequency, and boosts the switched voltage with 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.

The step-up transformer 590 generates magnetic noise. When the magnetic noise reaches the image sensor 16, a high-frequency changing magnetic field passes through the signal line for pixel charge information that extracts the image signal. This generates magnetism due to electromagnetic induction within the signal line, which results in noise being generated in the signal line for pixel charge information. If magnetic noise is thus superimposed on the image signal during the process in which the image sensor 16 generates and outputs the image signal, it can degrade image quality.

The following describes an arrangement of the focus group unit 500 that can solve this problem and also reduce the diameter of the interchangeable lens 101. FIG. 6 is a side view of the focus group unit 500. FIG. 7(a) is a cross-sectional view showing the focus group 501 disposed at one end of the moving range MR. FIG. 7(b) is a cross-sectional view showing the focus group 501 disposed at the other end of the moving range MR. FIG. 8 is a cross-sectional view of the interchangeable lens 101 in a plane perpendicular to the optical axis O.

When viewed from the optical axis direction as shown in FIG. 8, the lens barrel 550 is disposed on the inner periphery side of the linear guide barrel 107, and has a roughly cylindrical shape that follows the inner diameter of the linear guide barrel 107. The focus lens holding frame 520, the main guide 560, and the sub-guide 570 are disposed inside the outer periphery of the lens barrel 550 (the circumscribed circle of the lens barrel 550 centered on the optical axis).

The step-up transformer 590 and the vibration actuator 507 are arranged on the outer peripheral side surface of the lens barrel 550 so as not to protrude outward from the outer periphery of the lens barrel 550 (the circumscribing circle of the lens barrel 550 centered on the optical axis) when viewed from the optical axis direction as shown in FIG. 8. On the other hand, when focusing on the position of the step-up transformer 590 in the optical axis direction, as shown in FIG. 6, the step-up transformer 590 is arranged on the outer peripheral side surface of the lens barrel 550 at a position where at least a part of it overlaps with the vibration actuator 507 in the optical axis direction. In other words, the step-up transformer 590 and the 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.

As shown in Figures 7(a) and 7(b), at least a portion 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 the moving range MR. When attention is paid to the circumferential phase of the step-up transformer 590, the main guide 560, and the sub guide 570, as shown in Figure 8, 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.

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 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 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, but 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.

The present invention has been described above in detail based on preferred embodiments thereof, but the present invention is not limited to these specific embodiments, and various forms within the scope of the gist of the 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 structure, but the present invention is not limited to this.

REFERENCE SIGNS LIST 1 camera body 100 digital single-lens reflex camera 101 interchangeable lens 107 linear guide barrel 108 cam barrel 500 focus group unit 501 focus group 502 focus drive section 507 vibration actuator 520 focus lens holding frame 550 lens barrel 560 main guide 570 sub-guide 590 step-up transformer

Claims (7)

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. The optical device according to claim 1, characterized in that the linear guide tube is made of a conductive material. 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. The optical device according to claim 3, characterized in that the lens barrel can move in the optical axis direction as the cam barrel rotates due to the engagement between the cam barrel and the linear guide barrel. The optical device according to claim 3 or 4, characterized in that the cam barrel is made of a conductive material. The optical device according to any one of claims 1 to 5, characterized in that the actuator is a vibration type actuator having a vibrating body and a contact body that contacts the vibrating body. 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.