JP2022150648A - Optical instrument - Google Patents

Abstract

To solve the problem in that: a step-up transformer has a magnetic circuit such as a coil therein and has a large outer diameter for a circuit component, and when the step-up transformer and a movable and bending flexible printed wiring board are arranged to overlap in a radial direction on the outside of a cam barrel, the outer diameter of an optical instrument is increased.SOLUTION: An optical instrument has: a lens holding frame that holds a lens; an actuator that drives the lens holding frame; a cam barrel that is rotatable centered on an optical axis; a lens barrel that is arranged on an inner periphery of the cam barrel; a connection member that connects the cam barrel and the lens barrel to each other; a circuit component that is arranged on a side face of the lens barrel and forms a power supply of the actuator; and a circuit board that is arranged on the side face of the lens barrel and electrically connects the actuator and the circuit component to each other. The circuit component is arranged to overlap a first connection member. The circuit board has a movable bent part between the connection part and the circuit component.SELECTED DRAWING: Figure 6

Description

The present invention relates to an optical device such as a digital still camera, a video camera, and an interchangeable lens, and more particularly to an optical device having an arrangement structure of circuit components forming a power supply for an actuator and a flexible printed wiring board.

2. Description of the Related Art Digital cameras, video cameras, and optical devices such as interchangeable lenses, for which miniaturization is demanded in recent years, are sometimes equipped with ultrasonic motors in order to realize high-speed and quiet autofocus functions. A drive power source for an ultrasonic motor requires a circuit component (hereinafter referred to as a step-up transformer) that boosts the supplied voltage and applies a desired AC voltage to the ultrasonic motor. Since the leakage magnetic flux from the step-up transformer causes magnetic noise, there is a demand for a configuration that reduces the leakage magnetic flux.

Patent Literature 1 discloses a driving device in which a boosting section is arranged at a position different from a holding substrate on which a control section and a switching section are mounted, and brought closer to a vibration actuator. According to the configuration described in Patent Document 1, it is possible to shorten the wiring for the high-voltage drive signal flowing between the boosting section and the vibration actuator, and to reduce the adverse effects of leakage magnetic flux.

Further, Japanese Patent Laid-Open No. 2002-200002 discloses an optical device in which circuit components constituting a power supply can be accommodated in a concave shape on the side surface of a lens barrel arranged on the inner circumference of a cam barrel. According to the configuration described in Patent Document 2, it is possible to reduce the overall length of the optical device while reducing magnetic noise.

JP 2013-179787 A JP 2020-187232 A

However, in the configuration disclosed in Patent Document 1, a step-up transformer, which is a step-up section, is arranged outside the cam tube, which is a driven body. Generally, a step-up transformer has a magnetic circuit such as a coil inside, and has a relatively large outer diameter as a circuit component. Therefore, when the technology described in Patent Document 1 is used, if the step-up transformer is arranged outside the cam cylinder, the outer diameter of the optical device becomes large.

Moreover, if the technique described in Patent Document 2 is used, the step-up transformer and the flexible printed wiring board that bends in a radial direction overlap with each other, resulting in an increase in the outer diameter of the optical device.

In view of the above problems, the present invention arranges a connection portion between the actuator and a circuit component that constitutes the power source of the actuator so as to overlap the cam roller in the circumferential direction, and a movable bending portion of a flexible cable is provided between the circuit component and the connection portion. provide an optical instrument for placing the

In order to achieve the above object, the present invention provides a lens holding frame for holding a lens, an actuator for driving the lens holding frame, a cam barrel rotatable about an optical axis, and a cam barrel on the inner circumference of the cam barrel. A lens barrel to be arranged, a connecting member that connects the cam barrel and the lens barrel, a circuit component that is arranged on the side surface of the lens barrel and constitutes a power supply for the actuator, and a circuit component that is arranged on the side surface of the lens barrel. and a circuit board for electrically connecting the actuator and the circuit component, the circuit component being arranged so as to at least partially overlap the first connecting member in the circumferential direction, and the circuit component on the circuit board. The connecting portion with the actuator is arranged so as to overlap at least a part of the second connecting member in the circumferential direction, and the circuit board has a movable bending portion between the connecting portion and the circuit component in the circumferential direction. Provide an optical instrument characterized by:

According to the present invention, the space on the side surface of the lens barrel can be used to dispose circuit components on the inner circumference of the cam barrel, and the miniaturization of the optical device can be realized.

1A is a front perspective view of an interchangeable lens and a digital camera according to an embodiment of the present invention; FIG. (b) is a rear perspective view of an interchangeable lens and a digital camera according to an embodiment of the present invention; 1 is a block diagram showing configurations of an interchangeable lens and a digital camera according to an embodiment of the present invention; FIG. 1 is a cross-sectional view of an interchangeable lens according to an embodiment of the present invention; FIG. 3 is an exploded perspective view of the focus group unit in the embodiment of the invention; FIG. (a) is a view of the focus group unit in the embodiment of the present invention as seen from the first cam roller side. (b) is a view of the focus group unit in the embodiment of the present invention as seen from the second cam roller side. 4 is a diagram for explaining a cross section of the focus group unit in the embodiment of the invention; FIG. FIG. 3 is a diagram for explaining wiring patterns of conductor layers of a flexible printed wiring board according to an embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals throughout the drawings indicate the same or corresponding parts. In this embodiment, an interchangeable lens, which is an example of an optical device, will be described.

FIG. 1 shows the appearance of an interchangeable lens (optical device) 101 and a digital camera (hereinafter referred to as a camera body) 1 to which the interchangeable lens 101 is detachably attached according to the present embodiment. 1(a) and 1(b) are perspective views showing the front side and the back side of the camera body 1, respectively. As shown in FIG. 1A, the optical axis direction in which the optical axis of the imaging optical system accommodated by the interchangeable lens 101 extends is the X-axis direction, and the directions orthogonal to this are the Z-axis direction (horizontal direction) and the Y-axis direction. (vertically). Hereinafter, the Z-axis direction and the Y-axis direction are collectively referred to as the Z/Y-axis direction. Also, the direction of rotation about the Z-axis is defined as the pitch direction, and the direction of rotation about the Y-axis is defined as the yaw direction. The pitch direction and yaw direction (hereinafter collectively referred to as pitch/yaw direction) are directions of rotation about two axes, the Z axis and the Y axis, which are perpendicular to each other.

As shown in FIG. 1A, a grip portion for the user to grip the camera body 1 by hand is provided on the left side (right side when viewed from the rear) of the camera body 1 when viewed from the front (object side). 2 is provided. A power supply operation unit 3 is arranged on the upper surface of the camera body 1 . When the user turns on the power operation unit 3 while the camera body 1 is in the power-off state, the camera body 1 is turned on and imaging becomes possible. When the user turns off the power operation unit 3 while the camera body 1 is in the power-on state, the camera body 1 is turned off.

Furthermore, a mode dial 4 , a release button 5 and an accessory shoe 6 are provided on the upper surface of the camera body 1 . The imaging mode can be switched by the user rotating the mode dial 4 . The shooting modes include a manual still image shooting mode that allows the user to arbitrarily set shooting conditions such as shutter speed and aperture value, an auto still image shooting mode that automatically obtains the appropriate amount of exposure, and a video shooting mode. A moving image capturing mode and the like are included. In addition, by half-pressing the release button 5, the user can instruct imaging preparation operations such as autofocus and automatic exposure control, and by fully-pressing, it is possible to instruct imaging. Accessories such as an external flash and an external viewfinder (EVF) (not shown) are detachably attached to the accessory shoe 6 . In addition, the camera body 1 is provided with an imaging device that photoelectrically converts (images) a subject image formed by the imaging optical system in the interchangeable lens 101 .

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 . As described above, the interchangeable lens 101 accommodates an imaging optical system that forms an image of a subject by forming an image of light from the subject. A zoom operation ring 103 is provided on the outer periphery of the interchangeable lens 101 and is rotatable around the optical axis by user operation. The outer periphery of the zoom operation ring 103 is knurled so that the user's hand does not slip during operation. When the user rotates the zoom operation ring 103 , the zoom group constituting the imaging optical system moves to a predetermined optical position corresponding to the angle of the zoom operation ring 103 . In this way, the user can take an image at a desired angle of view.

As shown in FIG. 1(b), a rear operation section 8 and a display section 9 are provided on the rear surface of the camera body 1. As shown in FIG. The back operation unit 8 includes a plurality of buttons and dials to which various functions are assigned. When the power of the camera 1 is on and the still image or moving image capturing mode is set, the display unit 9 displays a through image of the subject image captured by the image sensor. Also, the display unit 9 displays imaging parameters indicating imaging conditions such as shutter speed and aperture value, and the user operates the rear operation unit 8 while viewing the display to change the setting values of the imaging parameters. It is possible. The back operation unit 8 includes a playback button for instructing playback of the recorded captured image. When the user operates the playback button, the captured image is played back and displayed on the display unit 9 .

FIG. 2 is a block diagram showing the configuration of the interchangeable lens 101 and the camera body 1 according to this embodiment.

As shown in FIG. 2, the camera body 1 includes a power supply unit 10 that supplies power to the camera body 1 and the interchangeable lens 101, the power operation unit 3, the mode dial 4, the release button 5, the rear operation unit 8, and the display. and an operation unit 11 including the touch panel function of the unit 9 . Control of the entire system of the camera body 1 and the interchangeable lens 101 is performed by the camera control section 12 provided in the camera body 1 and the lens control section 104 provided in the interchangeable lens 101 cooperating with each other. The camera control unit 12 reads and executes computer programs stored in the storage unit 13 . At this time, the camera control unit 12 communicates various control signals, data, etc. with the lens control unit 104 via the communication terminal of the electrical contact 105 provided on the lens mount 102 . The electrical contact 105 includes a power terminal that supplies power from the power supply section 10 described above to the interchangeable lens 101 .

The imaging optical system included in the interchangeable lens 101 includes a zoom group 201 that is connected to the zoom operation ring 103 and moves in the optical axis direction to change the angle of view, and a shift lens that serves as an anti-vibration element that reduces image blur. It has an anti-vibration group 301 . The lens vibration reduction group 301 moves (shifts) the shift lens in the Z/Y axis directions orthogonal to the optical axis to perform vibration reduction operation to reduce image blur. The imaging optical system also has an aperture group 401 that performs light amount adjustment operation and a focus group 501 that includes a focus lens that moves in the optical axis direction to perform focus adjustment. Further, the interchangeable lens 101 further includes an anti-vibration drive unit 302 that drives a lens anti-vibration group 301 to shift the shift lens, an aperture drive unit 402 that drives an aperture group 401, and a focus group 501 that moves the focus lens. It has a focus driving unit 502 that causes the

The camera body 1 has a shutter unit 14, a shutter driving section 15, an imaging device 16, an image processing section 17, and the camera control section 12 described above. The shutter unit 14 controls the amount of light collected by the imaging optical system in the interchangeable lens 101 and exposed by the imaging device 16 . The imaging device 16 photoelectrically converts the subject image formed by the imaging optical system and outputs an imaging signal. The image processing unit 17 generates an image signal after performing various image processing on the imaging signal. The display unit 9 displays an image signal (through image) output from the image processing unit 17, displays imaging parameters as described above, and displays captured images recorded in the storage unit 13 or a recording medium (not shown). or play back.

The camera control unit 12 controls driving of the diaphragm group 401 and the shutter unit 14 via the diaphragm driving unit 402 and the shutter driving unit 15 according to the setting values of the diaphragm value and the shutter speed received from the operation unit 11 . In addition, the camera control unit 12 controls the driving of the focus group 501 according to the imaging preparation operation (half-press operation) in the operation unit 11 (release button 5). For example, when an autofocus operation is instructed, the focus detection unit 18 determines the focus state of the subject image formed by the imaging device 16 based on the image signal generated by the image processing unit 17, A focus signal is generated and transmitted to the camera control unit 12 . At the same time, the focus drive section 502 detects the current position of the focus group 501 and transmits the signal to the camera control section 12 via the lens control section 104 . The camera control unit 12 compares the focus state of the subject image with the current position of the focus group 501 , calculates the focus drive amount from the shift amount, and transmits the calculated amount to the lens control unit 104 . Then, the lens control unit 104 drives and controls the focus group 501 to the target position via the focus driving unit 502 to correct defocus of the subject image.

Further, when the automatic exposure control operation is instructed, the camera control section 12 receives the luminance signal generated by the image processing section 17 and performs photometric calculation. Based on this photometry calculation result, the camera control unit 12 controls driving of the diaphragm group 401 in accordance with the imaging instruction operation (full-press operation) on the operation unit 11 (release button 5). At the same time, the camera control section 12 controls driving of the shutter unit 14 via the shutter driving section 15 and performs exposure processing by the imaging device 16 .

The camera body 1 has a pitch shake detection section 19 and a yaw shake detection section 20 as shake detection means capable of detecting image shake such as camera shake caused by the user. The pitch vibration detection unit 19 and the yaw vibration detection unit 20 use an angular velocity sensor (vibration gyro) and an angular acceleration sensor, respectively, to detect the pitch direction (rotational direction around the Z-axis) and the yaw direction (rotational direction around the Y-axis). It detects image blur and outputs a shake signal. The camera control unit 12 uses the shake signal from the pitch shake detection unit 19 to calculate the shift position of the lens stabilization group 301 (shift lens) in the Y-axis direction. Similarly, the camera control unit 12 uses the shake signal from the yaw shake detection unit 20 to calculate the shift position of the lens anti-vibration group 301 in the Z-axis direction. Then, the camera control unit 12 drives and controls the lens vibration reduction group 301 to the target position according to the calculated shift position in the pitch/yaw direction, and performs a vibration reduction operation to reduce image blurring during exposure or through image display. I do.

The interchangeable lens 101 has a zoom operation ring 103 for changing the angle of view of the imaging optical system, and a zoom detection unit 106 for detecting the angle of the zoom operation ring 103 . The zoom detection unit 106 detects the angle of the zoom operation ring 103 operated by the user as an absolute value, and is configured using, for example, a resistive linear potentiometer. Information on the angle of view detected by the zoom detection unit 106 is transmitted to the lens control unit 104 and reflected in various controls by the camera control unit 12 described above. On the other hand, part of such various information is recorded in the storage unit 13 or a recording medium together with the captured image.

Next, the positional relationship between the components of the interchangeable lens 101 and the camera body 1 will be described with reference to FIG.

FIG. 3 is a cross-sectional view on the XY plane including the optical axis in this embodiment, showing a zoom retracted state and a zoom extended state. Since the center line shown here substantially coincides with the optical axis determined by the imaging optical system, it is synonymous with the optical axis below.

As shown in FIG. 3, this embodiment employs a five-group configuration as an example of an imaging optical system. Each zoom group that has moved to a predetermined optical position corresponding to the angle of view forms an image of light from the subject on the imaging surface of the imaging device 16 . At this time, the zoom group 201 described above serves as the first zoom group, the lens stabilization group 301 serves as the second zoom group, the diaphragm group 401 serves as the third zoom group, and the focus group 501 serves as the fifth zoom group. Function. Also, the adjustment group 601 is arranged as a fourth zoom group. The adjustment group 601 is fixed by intentionally shifting its optical position to maintain the optical performance of the imaging optical system as a whole. By moving the adjustment group 601 to a desired position while checking the state of the overall optical performance, it is possible to cancel adverse effects such as manufacturing errors and assembly variations that occur in each component. Also, the protective glass 202 is for preventing the user from touching the lens group carelessly, and does not have an optical function, so it may be omitted. The present invention does not limit the configuration of the lens groups, and for example, a part of the lens groups may be fixed.

A fixed cylinder 109 is fixed to the lens mount 102 and is a fixed part that holds the main board 800 on which the lens control section 104 is mounted. Also, the rectilinear guide tube 107 is a fixed component that is fixed to the lens mount 102 via a fixed tube 109 . Bayonet claws (not shown) are arranged at equally divided positions on the outer peripheral surface of the rectilinear guide tube 107 . On the other hand, the inner peripheral surface of the cam cylinder 108 is provided with a peripheral groove (not shown). Further, the cam cylinder 108 is connected with the zoom operation ring 103 . When the zoom operation ring 103 is rotated, the cam barrel 108 rotates about the optical axis due to the engagement between the bayonet claw and the circumferential groove.

The rectilinear guide tube 107 is formed with a rectilinear guide groove that restricts the movement of each zoom group in the rotational direction and guides the rectilinear movement in the optical axis direction. The cam barrel 108 is formed with cam grooves having trajectories at different angles in the rotational direction corresponding to the respective zoom groups. On the other hand, each of the first to fifth zoom groups is provided with a cam follower, and each cam follower is engaged with the corresponding rectilinear guide groove and cam groove. When the user rotates the zoom operation ring 103, the cam barrel 108 rotates, and the cam follower advances and retreats the respective zoom groups simultaneously in the optical axis direction due to the engagement between the rectilinear guide groove and the cam groove.

Next, with reference to FIGS. 4 to 7, characteristic parts constituting the present invention will be described in detail.

FIG. 4 is an exploded perspective view showing the focus group unit 500 and the main board 800 in the present embodiment, as viewed obliquely from the front.

As shown in FIG. 4, the focus group unit 500 includes a lens barrel 510, a focus group 501 housed therein, and an adjustment group unit 600. As shown in FIG. A direct-acting vibration wave motor (hereinafter referred to as a vibration wave motor) 503 , which is a type of ultrasonic motor, is mounted on the top surface of the lens barrel 510 as an actuator forming part of the focus driving unit 502 . The lens barrel 510 is held so as to be linearly movable in the optical axis direction by the action of the cam barrel 108 and the linear guide barrel 107 .

The vibration wave motor 503 has a long axis in the optical axis direction, and moves the focus group 501 in the optical axis direction via a connecting member (not shown) according to an instruction from the lens control unit 104 . The vibration wave motor 503 is composed of a motor movable portion 504 having a vibrator and a motor fixed portion 505 having a friction member. A vibrator is composed of a vibrating plate having a frictional contact portion and a piezoelectric element fixed to the back surface of the vibrating plate with an adhesive or the like. The diaphragm is pressed into contact with the friction member at the friction contact portion. On the other hand, circuit components are electrically connected to the piezoelectric element via a flexible printed wiring board 700 (circuit board). Specifically, by connecting the driving flexible printed wiring board 507 electrically connected to the piezoelectric element to the driving connector 702a mounted on the connection portion 702, the flexible printed wiring board 700 and the main substrate 800 Electrical connection with circuit components becomes possible. The distance between the circuit component and the connecting portion 702 increases as the focal length moves to the telephoto side.

When a two-phase AC voltage is applied as a drive signal to the piezoelectric element, vibration of a frequency in the ultrasonic range (ultrasonic vibration) is excited. As a result, a resonance phenomenon occurs in the vibrator, the vibrator is deformed, and an elliptical motion occurs in the frictional contact portion. At this time, when the frequency and phase of the two-phase AC voltage applied to the piezoelectric element are changed, the rotational direction of the elliptical motion and the elliptical ratio are changed. Thus, the lens control unit 104 can control the traveling wave generated in the vibrating body, and drives and controls the focus group 501 to the target position. A focus driving unit 502 generates a driving pulse of a relatively high frequency, and the circuit is switched by this driving pulse.

Further, the lens barrel 510 is provided with cam rollers 511 that engage with the cam barrel 108 (not shown), and three cam rollers are arranged at intervals of 120° in the circumferential direction, including locations not shown.

The flexible printed circuit board 700 is attached to the lens barrel 510 and has a board connection portion 703 that connects to a connector (not shown) mounted on the main board 800 . Furthermore, it has a movable bending portion 704 so that it can be integrated with the lens barrel 510 to advance and retreat in the optical axis direction when the user rotates the zoom operation ring 103 .

FIG. 5 is a diagram for explaining the flexible printed wiring board 700 in this embodiment.

FIG. 5A is a side view of the focus group unit 500 and the main substrate 800 as seen from the first cam roller 511 side. FIG. 5B is a side view of the focus group unit 500 and the main board 800 as seen from the second cam roller 512 side.

As shown in FIGS. 5A and 5B, the flexible printed wiring board 700 includes a circuit mounting section 701 on which a step-up transformer 701a and an inductor 701b, which are part of the circuit that constitutes the power source of the focus driving section 502, are mounted, It is composed of a connecting portion 702 on which a drive connector 702a is mounted, a substrate connecting portion 703 and a movable bending portion 704. FIG.

The circuit mounting portion 701 forms a plane perpendicular to the image sensor 16, is arranged so as to overlap at least a part of the first cam roller 511 in the circumferential direction, and is located closer to the subject than the first cam roller 511 in the optical axis direction. placed. The connection portion 702 is arranged so as to overlap at least a part of the second cam roller 512 in the circumferential direction, and is arranged closer to the subject than the second cam roller 512 in the optical axis direction.

FIG. 6 is a cross-sectional view of FIG. 5B showing a plane perpendicular to the optical axis in this embodiment, viewed from the object side.

As shown in FIG. 6, the movable bending portion 704 is arranged between the circuit mounting portion 701 and the connecting portion 702 in the circumferential direction. That is, in the circumferential direction, the movable bent portion 704 is arranged between the first cam roller 511 and the second cam roller 512, and the circuit mounting portion 701, the connection portion 702, and the movable bent portion 704 have different lens barrels in the circumferential direction. placed on the face. A lens holding frame 520 holds a lens. The lens holding frame 520 is linearly driven in the optical axis direction by the action of the focus driving section 502 .

A lens barrel 510 with a wide range of movement in the optical axis direction, such as a super-telephoto zoom lens, needs to secure a wide flat surface 510a for allowing the integrally movable movable bending portion 704 to move in the direction of the optical axis. be. However, since the cam rollers are arranged in the lens barrel 510 at intervals of 120 degrees in the circumferential direction, if an attempt is made to ensure a sufficient flat surface in the optical axis direction at the phase where the cam rollers are present in the circumferential direction, the total length of the lens barrel 510 becomes This leads to an increase in the size of the interchangeable lens 101 itself. Therefore, in this embodiment, the circuit mounting portion 701 and the connection portion 702 are arranged at the phase where the cam rollers are arranged in the circumferential direction of the lens barrel 510, and the plane for the movable bending portion 704 is arranged at the phase where the cam rollers are not arranged in the circumferential direction. to place. Thus, in this embodiment, the space is effectively utilized, and the size reduction of the lens barrel 510 and the interchangeable lens 101 is realized. Furthermore, by arranging the circuit mounting portion 701, the connecting portion 702, and the movable bending portion 704 on different surfaces of the lens barrel 510, for example, the circuit mounting portion 701 and the movable bending portion 704 do not overlap in the radial direction, and the size can be reduced in the radial direction. It is also effective in making

Next, the step-up transformer 701a will be described.

A resonance circuit composed of the step-up transformer 701a and the inductor 701b makes it possible to output a voltage higher than the voltage supplied to the lens control unit 104. FIG. When power is supplied through the flexible printed circuit board 700, the step-up transformer 701a generates magnetic flux in the direction of the winding axis of the coil provided therein. In this embodiment, as an example, the case of generating magnetic flux in the thickness direction (701c direction) of the step-up transformer 701a is shown. If such a magnetic flux is generated in the process of the imaging device 16 generating and outputting an imaging signal, the fluctuation may be superimposed on the imaging signal as magnetic noise, degrading the image quality. More specifically, when the magnetic noise reaches the imaging device 16, a magnetic field that changes at high frequency penetrates the signal line of the pixel charge information from which the imaging signal is extracted. As a result, magnetism is generated in the signal line due to electromagnetic induction, and as a result, noise is generated in the signal line for pixel charge information.

Therefore, in this embodiment, the arrangement of the step-up transformer 701a is devised so that the generated magnetic flux is not perpendicular to the imaging surface. Specifically, since the magnetic flux generated by the step-up transformer 701a is directed in the direction 701c shown in FIG. 6, the step-up transformer 701a is arranged so that the direction 701c is directed to the optical axis. Further, by forming the cam cylinder 108 with a conductive metal, it is possible to reduce the magnetic flux leaking from the outer peripheral side of the cam cylinder 108 in the direction 701c. The magnetic flux generated from the step-up transformer 701a tries to pass through the cam cylinder 108 made of metal, but if the magnetic flux density changes in the process, an eddy current is generated by electromagnetic induction. As a result, the magnetic flux penetrating the cam cylinder 108 is reduced, making it possible to reduce magnetic noise.

FIG. 7 is a diagram for explaining the wiring pattern of the conductor layer of the flexible printed wiring board 700 in this embodiment.

As shown in FIG. 7, the flexible printed wiring board 700 is roughly composed of two wires for transmitting drive signals for driving the drive motor 503 .

A first wiring 710 is a wiring pattern from the substrate connection portion 703 to the boost coil 701a, and transmits a drive signal from the main substrate 800 having the lens control portion 104 to the circuit components such as the boost transformer 701a and the inductor 701b. The second wiring 720 is a wiring pattern of the drive connector 702a from the booster coil 701a, outputs a voltage higher than the voltage supplied to the main substrate 800 by the resonance circuit of the booster transformer 701a and the inductor 701b, and A drive signal is transmitted to 503 .

In general, wiring for drive signals tends to affect adjacent wirings with noise, so it is desirable to reduce the influence of noise on adjacent wirings by increasing the distance between the wirings. Both the first wiring 710 and the second wiring 720 are for driving signals, but the second wiring 720 has a high voltage due to the voltage boosting coil 701a described above, so that the adjacent wirings are more affected by noise. It is considered to be. Therefore, the flexible printed wiring board 700 is devised by providing a hole 705 between the first wiring 710 and the second wiring 720 so that the first wiring 710 and the second wiring 720 do not run side by side. is doing.

Further, if the distance between the first wiring 710 and the second wiring 720 is increased more than necessary, the flat surface 510a on the lens barrel 510 for allowing the movable bending portion 704 to advance and retreat in the optical axis direction may be inadvertently displaced. As a result, the entire length of the lens barrel 510 is extended. Therefore, by making the first wiring 710 close to the second wiring 720 only at the arc portion 710a, the noise effect of the second wiring 720 on the first wiring 710 can be reduced, and the lens barrel 510 can be made compact. enable

Further, by providing the hole portion 705, the flexible width of the bent portion 706 connecting the circuit mounting portion 701 and the movable bent portion 704 can be narrowed. This makes it easier to bend the circuit mounting portion 701 and the movable bending portion 704 when attaching them to different surfaces of the lens barrel 510, thereby improving assembly.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist. For example, instead of the flexible printed wiring board 700, a hard board based on a rigid base material such as glass epoxy may be employed. Further, the applications of the step-up transformer 701a and the inductor 701b are not limited, and they may be part of a circuit that constitutes a power source such as a stepping motor or a voice coil motor as an example of an actuator that drives a lens group.

1 Digital Camera Body 16 Imaging Device 101 Interchangeable Lens 103 Zoom Operation Ring 108 Cam Tube 510 Lens Tube 511 First Cam Roller 512 Second Cam Roller 700 Flexible Printed Wiring Board 701 Circuit Mounting Section 702 Connecting Section 703 Board Connecting Section 704 Movable Bending Section 705 hole portion 710 first wiring 710a arc portion 720 second wiring 800 main board

Claims (9)

a lens holding frame that holds a lens;
an actuator that drives the lens holding frame;
a cam cylinder rotatable about the optical axis;
a lens barrel arranged on the inner periphery of the cam barrel;
a connecting member that connects the cam barrel and the lens barrel;
a circuit component arranged on the side surface of the lens barrel and constituting a power supply for the actuator;
a circuit board arranged on a side surface of the lens barrel and electrically connecting the actuator and the circuit component;
The circuit component is arranged so as to overlap at least a portion of the first connecting member in the circumferential direction,
a portion of the circuit board connected to the actuator is arranged so as to at least partially overlap a second connecting member in the circumferential direction;
1. An optical device according to claim 1, wherein said circuit board has a movable bent portion between said connection portion and said circuit component in a circumferential direction. 2. An optical instrument according to claim 1, wherein said lens barrel holds said actuator. 3. The optical apparatus according to claim 1, wherein both the circuit component and the connecting portion are arranged so as to overlap the actuator in the optical axis direction. Furthermore, having a main substrate,
The circuit board has first wiring that connects the main board and the circuit component, and second wiring that connects the circuit component and the actuator,
4. An optical device according to claim 1, wherein a hole is provided between said first wiring and said second wiring. Furthermore, having a main substrate,
The circuit board has first wiring that connects the main board and the circuit component, and second wiring that connects the circuit component and the actuator,
the first wiring has an arc portion,
5. The optical device according to claim 1, wherein the second wiring is adjacent to the first wiring at the arc portion. 6. The optical apparatus according to claim 1, wherein the lens holding frame is linearly driven in the optical axis direction by the action of the actuator. 7. The lens barrel is held so as to be linearly movable in the direction of the optical axis by the action of the cam barrel and a guide barrel 107 arranged on the inner circumference of the cam barrel. 2. The optical instrument according to item 1. the circuit component and the connecting portion are provided closer to the subject than the connecting member in the optical axis direction,
8. The optical apparatus according to claim 1, wherein the circuit component and the connecting portion become distant from the imaging surface as the focal length moves to the telephoto side. 9. The optical device according to any one of claims 1 to 8, wherein the circuit board is a flexible printed wiring board.

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