JP2021036282A - Optical device and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device capable of reducing the influence of noise and an imaging device using the same. SOLUTION: The FPC 37 has a conductive FPC holding sheet metal 38 for holding the FPC 37, a guide cylinder 19 for holding the FPC holding sheet metal 38 by an inner peripheral surface, and a printed circuit board 23 to which the FPC 37 is connected. Is an FPC that connects the FPC main body 37a held by the first surface 38a of the FPC holding sheet metal 38, the GND pattern 37b connected to the ground signal line of the printed circuit board 23, and the FPC main body 37a and the GND pattern 37b. The GND pattern 37b including the relay portion 37c is characterized in that the GND pattern 37b is narrowly held by the second surface 38b of the FPC holding sheet metal 38 and the guide cylinder 19. [Selection diagram] Fig. 4

Description

The present invention relates to an optical device and an imaging device using the same.

An optical device including an optical member such as a lens is known to have a drive unit for driving the optical member and a detection unit for detecting the position of the optical member. A flexible printed wiring board that can be deformed as the optical member moves is used to connect the drive unit or detection unit to the electric circuit board for controlling the drive unit.

Patent Document 1 discloses a configuration in which a flexible printed wiring board connects an electromagnetic diaphragm unit including a diaphragm motor and a blade detection element to a main circuit board. The flexible printed wiring board is held by the holding plate.

JP-A-2017-106950

However, when the flexible printed wiring board is held by the holding plate as in Patent Document 1, the electric charge of the holding plate fluctuates due to the drive signal of the diaphragm motor, and noise is superimposed on the detection signal line of the blade detection element due to the potential fluctuation. There is concern about doing so. If noise is superimposed on the detection signal line, there is a problem that the accuracy of position control of the optical member deteriorates.

An object of the present invention is to provide an optical device capable of reducing the influence of noise and an imaging device using the same.

The optical device of the present invention comprises a flexible substrate, a conductive holding member that holds the flexible substrate, a lens barrel member that holds the holding member by an inner peripheral surface, and a circuit board to which the flexible substrate is connected. The flexible substrate has a main body portion held by the first surface of the holding member, a connection portion connected to the ground signal line of the circuit board, and a relay connecting the main body portion and the connection portion. The connecting portion includes a portion, and the connecting portion is narrowly held by the second surface of the holding member and the lens barrel member.

It is possible to provide an optical device capable of reducing the influence of noise and an imaging device using the same.

It is sectional drawing of the state (TELE) in which the total length of the interchangeable lens which concerns on Example 1 is shortened. It is sectional drawing of the state (WIDE) in which the total length of the interchangeable lens which concerns on Example 1 is extended. It is a system block diagram of the interchangeable lens of Example 1 and the camera body. It is an exploded perspective view of a part of the interchangeable lens which concerns on Example 1. FIG. It is a development view of the FPC which concerns on Example 1. FIG. It is an enlarged perspective view in the holding state of FPC which concerns on Example 1. FIG. It is sectional drawing in the built-in state of FPC which concerns on Example 1. FIG. It is a partial cross-sectional view in the built-in state of FPC which concerns on Example 1. FIG. It is a partial cross-sectional view of FPC which concerns on Example 1. FIG. It is a partial cross-sectional view of FPC which concerns on Example 2. FIG. It is a development view of the main part of FPC which concerns on Example 2. FIG.

(Example 1)
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the direction of the optical axis indicated by the alternate long and short dash line in the drawing, the object side of the interchangeable lens 50 (optical device) having an optical system including a lens as an optical element is the front side, and the fixed side fixed to the camera body 70 by a bayonet. Defined as the rear side. The interchangeable lens 50 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a cross-sectional view of the interchangeable lens 50 in a state of TELE in which the total length of the interchangeable lens 50 is reduced. FIG. 2 is a cross-sectional view of the interchangeable lens 50 in a WIDE state in which the total length of the interchangeable lens 50 is extended. The group 1 lens 1 which is an optical member is held by the group 1 lens barrel 2. The 1st group lens barrel 2 is held by the 1st group adjustment ring 3, and the 1st group adjustment ring 3 moves the 1st group lens barrel 2 on the plane in the direction perpendicular to the optical axis direction and the optical axis direction for optical adjustment. .. The 1st group lens barrel 2 and the 1st group adjustment ring 3 are held by the 1st group base 4.

The straight cylinder 5 is formed with a screw portion for attaching a filter (not shown) on the subject side. The straight cylinder 5 and the group 1 lens 1 move in and out as a unit with the zoom operation, but in the first embodiment, they are supported by different support structures (not shown) and move. The specifications of the interchangeable lens 50 and the like are printed on the decorative ring 6, and the decorative ring 6 is fixed to the straight cylinder 5 with screws and has an appearance.

The second group lens 7 (focus lens), which is an optical member, is held by the second group lens barrel 8 (focus unit, movable member), and the second group lens barrel 8 is moved along the optical axis direction by a straight-ahead guidance mechanism (not shown). It is supported so that it can move forward and backward. Then, the 2nd group lens 7 and the 2nd group lens barrel 8 are moved together by the ultrasonic motor unit 30 (ultrasonic motor), and the focusing operation is performed. This straight-ahead guidance mechanism uses two cylindrical members extending in the optical axis direction, so-called guide bars, one of which determines the tilt / eccentricity of the second group lens barrel 8 and the other the optical axis. Determine the rotation position around. The second group lens barrel 8 is supported so that it can move forward and backward along the guide bar.

The 3-group lens 9 is held by the 3-group lens barrel 10. The 4-group lens 11, which is an optical member, is held by the 4-group lens barrel 12. The 4-group unit 40 movably supports the 4-group lens barrel 12 on a plane perpendicular to the optical axis direction, and corrects so-called camera shake by moving the 4-group lens barrel 12, that is, the 4-group lens 11. It fulfills the optical anti-vibration function. The actuator for producing this optical vibration isolation function is a so-called voice coil motor, but a detailed description of its configuration is omitted.

The 5-group lens 13 is held by the 5-group lens barrel 14, and the 6-group lens 15 is held by the 6-group lens barrel 16. The 5th group lens barrel 14 is fixed to the 6th group lens barrel 16 with a screw (not shown). Each of the lens groups described above is not configured as one lens, but may be composed of a plurality of lens groups, but the details are omitted for convenience of explanation.

The diaphragm unit 17, which is an optical member for adjusting the amount of light, is fixed to the group 4 unit 40 and has a plurality of light-shielding blades. Then, a plurality of light-shielding blades of the diaphragm unit 17 are driven by a stepping motor (not shown) as a drive source, and a desired F value can be obtained. The above-mentioned 3rd group lens barrel 10 is sandwiched between the aperture unit 17 and the 4th group lens barrel 12 integrally fixed to the 4th group unit 40, but can be moved in the optical axis direction.

The sub-aperture unit 18, which is an optical member that cuts a predetermined flare light, is supported by the fourth group unit 40, and has a plurality of light-shielding blades inside like the aperture unit 17. Then, a plurality of light-shielding blades of the sub-aperture unit 18 are driven by a mechanical connection mechanism (not shown), and it is possible to change the plurality of light-shielding blades into an opening shape corresponding to the zoom positions of TELE to WIDE.

A guide cylinder 19 (lens barrel member) is provided, and a cam ring 20 rotatably engaged with the outer peripheral side of the guide cylinder 19 is further provided. A front fixing cylinder 22 is provided on the object side, a rear fixing cylinder 21 is provided on the camera body 70 side, and the front fixing cylinder 22 is fixed to the front side of the rear fixing cylinder 21 with screws. Further, a printed circuit board 23 (circuit board) on which a guide cylinder 19, an appearance cylinder 24, a mount 25, a lens driving IC, a microcomputer, and the like are arranged is fixed to the rear fixing cylinder 21.

A switch (not shown) capable of switching between MF⇔AF and IS mode is arranged on the outer peripheral surface of the appearance cylinder 24 fixed to the rear fixing cylinder 21 with screws. Further, a back cover 27 is fixed to the mount 25 fixed to the rear fixing cylinder 21 with screws, and a light-shielding line for cutting harmful light is arranged on the inner surface thereof. The mount cylinder 26 is sandwiched and fixed between the rear side fixing cylinder 21 and the mount 25, and like the back cover 27, a light-shielding line is arranged on the inner surface thereof. In the interchangeable lens 50 of the first embodiment, the focusing position on the image pickup unit 78 (image sensor) can be adjusted by changing the thickness of the mount cylinder 26 in the optical axis direction by processing or the like. The contact block 28 is connected to the printed circuit board 23 by a wiring (flexible board or the like) (not shown), and is fixed to the mount 25 with screws.

The focus operation ring 29 is arranged outside the front fixed cylinder 22 in the radial direction, and is rotatably supported at a fixed position about the front fixed cylinder 22 as an axis. When the focus operation ring 29 is rotated, a sensor (not shown) detects the rotation, drives the second group lens barrel 8 according to the amount of rotation, and controls focusing of the second group lens 7.

The ultrasonic motor unit 30 is a driving means of the second group lens barrel 8 and can move by itself by the ultrasonic vibration generated by the piezoelectric element. The group 2 lens barrel 8 and the ultrasonic motor unit 30 are engaged by a connecting mechanism (not shown), and the group 2 lens barrel 8 can move together with the ultrasonic motor unit 30.

The first base 31 of the second group lens 7 holds one end of the guide bar constituting the straight-ahead guidance mechanism described above. The second base 32 of the second group lens 7 holds the other end of the guide bar, the ultrasonic motor unit 30, and the position detection sensor. That is, the guide bar is sandwiched between the first base 31 and the second base 32 and fixed at a predetermined position.

The function operation ring 33 is rotatably supported at a fixed position about the front fixed cylinder 22 as an axis. After the function operation ring 33 is incorporated, the front cover 34 is fixed to the front fixing cylinder 22 with a fixing screw 36 which is a fixing member as a presser. Similar to the focus operation ring 29, the rotation amount of the function operation ring 33 is detected by a sensor (not shown). In the first embodiment, the aperture unit 17 can be controlled by the detected value and changed to an arbitrary F value. It is also possible to assign changes in shooting conditions different from the F value, such as ISO sensitivity and shutter speed, to the function operation ring 33.

A screw passage hole 29a for inserting the fixing screw 36 is provided on the outer peripheral surface of the focus operation ring 29. In the interchangeable lens 50 of the first embodiment, the focus operation ring 29 is already incorporated when the fixing screw 36 is screwed. Therefore, the fixing screw 36 can be inserted through the screw passage hole 29a provided in the focus operation ring 29.

The zoom operation ring 35 is rotatably supported by the rear fixed cylinder 21. A wave washer (not shown), which is a thrust urging member, has a thrust urging structure that urges the zoom operation ring 35 in the optical axis direction by being sandwiched between the zoom operation ring 35 and the rear fixed cylinder 21. Consists of. The PL cover washer (not shown) is arranged between the wave washer and the surface on the zoom operation ring 35 side.

Since the zoom operation ring 35 is made of a resin material by the mold, a parting line (hereinafter referred to as PL) in mold molding exists on the inner peripheral surface of the zoom operation ring 35. The PL cover washer is arranged so that minute steps and burrs generated in the PL do not come into contact with the wave washer. The cam ring 20 and the zoom operation ring 35 are connected by a zoom key (not shown), and when the user rotates the zoom operation ring 35, the cam ring 20 rotates. The position of the zoom operation ring 35 in the optical axis direction is determined by engaging a bayonet (not shown) described later with respect to the rear fixed cylinder 21.

Next, the position adjustment mechanism of each lens group will be described. On the second base 32 of the 1st group base 4 that holds the 1st group lens barrel 2 and the 1st group adjustment ring 3, the 3rd group lens barrel 10, the 2nd group lens barrel 8 and the 2nd group lens 7 that holds the ultrasonic motor unit 30. Each of the rollers (not shown) is arranged, and these rollers engage with the cam ring 20.

As described above, the 4th group unit 40 is equipped with an actuator and an auxiliary aperture unit 18 for exerting an optical anti-vibration function, but is also equipped with an aperture unit 17 arranged in front of the 3rd group lens barrel 10. ing. Rolls (not shown) are arranged on the 6-group lens barrel 16 that holds the 4-group unit 40 and the 5-group lens barrel 14, and these rollers engage with the cam ring 20.

These rollers are engaged with cam grooves (not shown) provided on the cam ring 20 having different trajectories. The cam groove has a locus such that each lens group optically has a desired lens spacing at a desired zoom position. As the cam ring 20 rotates around the optical axis, the 1st group base 4, the 3rd group lens barrel 10, the 4th group unit 40, the 6th group lens barrel 16 and the 2nd base 32 are moved from the contracted TELE position shown in FIG. It can be arranged at the extended WIDE position shown in FIG. 2 and at any zoom position in between.

The rotation of the cam ring 20 is detected by a sensor (not shown), the zoom position according to the amount of rotation is determined from the detected signal by the IC mounted on the printed circuit board 23, and the focus and vibration isolation according to the zoom position are determined. , The aperture is controlled.

The interchangeable lens 50 of the first embodiment is detachably fixed to the camera body 70, which is an imaging device, with a mount 25 by a bayonet. When the interchangeable lens 50 is fixed to the camera body 70 by the mount 25, the printed circuit board 23 provided with the control means for controlling the operation of each lens group can communicate with the camera body 70 via the contact block 28.

The image pickup unit 78 is mounted on the camera body 70, and is an optical-electric conversion element (imaging element) such as CMOS or CCD that receives light from a subject that has passed through the interchangeable lens 50 and converts the light into an electric signal. Is.

FIG. 3 shows the electrical configuration of the camera system in the interchangeable lens 50 and the camera body 70. First, the control flow inside the camera body 70 will be described. The camera CPU 71 is composed of a microcomputer. The camera CPU 71 controls the operation of each part in the camera body 70. Further, when the interchangeable lens 50 is attached, the camera CPU 71 communicates with the lens CPU 51 provided in the interchangeable lens 50 via the lens-side electric contact 52 and the camera-side electric contact 72. The information (signal) transmitted by the camera CPU 71 to the lens CPU 51 includes drive amount information, parallel runout information, and focus runout information of the second group lens 7. Further, the information (signal) transmitted from the lens CPU 51 to the camera CPU 71 includes imaging magnification information. The lens-side electrical contact 52 and the camera-side electrical contact 72 include a contact for supplying power from the camera body 70 to the interchangeable lens 50.

The power switch 73 is a switch that can be operated by the photographer, and can start the camera CPU 71 and start supplying power to each actuator, sensor, or the like in the camera system. The release switch 74 is a switch that can be operated by the photographer, and has a first stroke switch SW1 and a second stroke switch SW2. The signal from the release switch 74 is input to the camera CPU 71. The camera CPU 71 enters the shooting preparation state in response to the input of the ON signal from the first stroke switch SW1. In the shooting preparation state, the photometric unit 75 measures the subject brightness and the focus detection unit 76 performs focus detection.

The camera CPU 71 calculates the aperture value of the aperture unit 17 and the exposure amount (shutter seconds) of the image sensor of the image pickup unit 78 based on the photometric result of the photometric unit 75. Further, the camera CPU 71 drives the 2nd group lens 7 and the 2nd group lens barrel 8 to obtain the focusing state with respect to the subject based on the focus information which is the detection result of the focal state of the photographing optical system by the focus detecting unit 76. Determine (including drive direction). The focus information is the defocus amount and the defocus direction. The drive amount information (drive amount information of the second group lens 7) is transmitted to the lens CPU 51. The lens CPU 51 controls the operation of each component of the interchangeable lens 50.

Further, the camera CPU 71 starts the shift drive of the 4th group lens barrel 12, that is, the control of the vibration isolation operation when the predetermined shooting mode is set. When the ON signal from the second stroke switch SW2 is input, the camera CPU 71 transmits an aperture drive command to the lens CPU 51, and sets the aperture unit 17 to the previously calculated aperture value. Further, the camera CPU 71 transmits an exposure start command to the exposure unit 77 to perform an operation of retracting a mirror (not shown) and an operation of opening a shutter (not shown), and the image sensor of the image sensor 78 performs photoelectric conversion of the subject image. That is, the exposure operation is performed.

The image pickup signal from the image pickup unit 78 is digitally converted by the signal processing unit in the camera CPU 71, further subjected to various correction processes, and output as an image signal. The image signal (data) is recorded and stored in the image recording unit 79 in a semiconductor memory such as a flash memory or a recording medium such as a magnetic disk or an optical disk.

Next, the control flow inside the interchangeable lens 50 will be described. The MF ring rotation detection unit 53 detects the rotation of the focus operation ring 29, and the ZOOM ring rotation detection unit 54 detects the rotation of the zoom operation ring 35.

The IS drive unit 55 includes a drive actuator of the fourth group lens barrel 12 that performs vibration isolation operation and a drive circuit thereof. The AF drive unit 56 performs AF drive of the second group lens barrel 8 through an AF motor (ultrasonic motor unit 30) according to the drive amount information of the second group lens 7 transmitted from the camera CPU 71.

The electromagnetic aperture drive unit 57 is controlled by the lens CPU 51 that receives an aperture drive command from the camera CPU 71 to operate the aperture unit 17 in an open state corresponding to a specified aperture value.

The angular velocity sensor 58 is mounted on the interchangeable lens 50 and connected to the printed circuit board 23. The angular velocity sensor 58 detects the angular velocities of the vertical (pitch direction) runout and the lateral (yaw direction) runout, which are the angular velocities of the camera system, and outputs the detected values as angular velocity signals to the lens CPU 51. The lens CPU 51 electrically or mechanically integrates the angular velocity signals in the pitch direction and the yaw direction from the angular velocity sensor 58, and the amount of displacement in each direction, the amount of runout in the pitch direction and the amount of runout in the yaw direction (collecting these). Is called the amount of angular velocity.)

The lens CPU 51 controls the IS drive unit 55 based on the combined displacement amount of the above-mentioned angular runout amount and parallel runout amount to shift drive the 4th group lens barrel 12, and performs angle runout correction and parallel runout correction. Further, the lens CPU 51 controls the AF drive unit 56 based on the amount of focus shake to drive the group 2 lens barrel 8 in the optical axis direction to correct the focus shake.

Next, the details regarding the holding configuration of the FPC 37 (flexible substrate) and the FPC holding sheet metal 38 (holding member) will be described. FIG. 4 is an exploded perspective view of the interchangeable lens 50 for explaining the holding configuration of the FPC 37 and the FPC holding sheet metal 38. FIG. 5 is a developed view of the FPC 37. FIG. 6 is a perspective view showing a state in which the FPC 37 is held by the FPC holding sheet metal 38. FIG. 7 is a cross-sectional view of a state in which the FPC 37 and the FPC holding sheet metal 38 are incorporated, and FIG. 8 is a partial cross-sectional view of a part of FIG. 7. Further, FIG. 9 is a cross-sectional view taken along the cross-sectional line IX-IX shown in FIG.

The ultrasonic motor unit 30 is electrically connected to the printed circuit board 23 via the FPC 37 by another FPC (not shown). As shown in FIG. 5, a position detection sensor 39 is mounted on the FPC 37, and the position detection sensor 39 is electrically connected to the printed circuit board 23. The portion of the FPC 37 on which the position detection sensor 39 is mounted is fixed to the second base 32.

As shown in FIG. 4, the FPC 37 is held by the FPC holding sheet metal 38. Details regarding the holding configuration of the FPC 37 and the FPC holding sheet metal 38 will be described later. The position of advance / retreat of the group 2 lens barrel 8 is detected by the position detection sensor 39 which is a detection means, and a position detection signal is output. By driving and controlling the ultrasonic motor unit 30 so as to move the group 2 lens barrel 8 by a predetermined amount based on the position detection signal, it is possible to move to a desired focusing position.

The FPC holding sheet metal 38 is a conductive metal sheet metal, and has a hook portion 38d formed on one end side and a tip spring portion 38e formed on the other end side. Further, as shown in FIG. 9, the FPC holding sheet metal 38 has a first surface 38a to which the FPC main body portion 37a is attached and a surface opposite to the first surface 38a, and is a GND pattern 37b (connection portion). A second surface 38b with which is provided. Then, as shown in FIG. 6, a plurality of protrusions 38c are formed on the second surface 38b along the longitudinal direction of the FPC holding sheet metal 38.

As shown in FIG. 5, the FPC37 is a single-sided flexible substrate in which the back side of the paper surface is the back surface and the base material side, and the front side of the paper surface is the front surface, and the conductor of each signal pattern is one at one end of the FPC 37. The part is exposed. The motor drive signal line 37d (drive signal line, first signal line) is a wiring through which a drive signal for driving the ultrasonic motor unit 30 connected via another FPC (not shown) is passed. The sensor output signal line 37e (detection signal line, second signal line) is connected to the position detection sensor 39 and is a wiring through which the sensor output signal is passed. Both the motor drive signal line 37d and the sensor output signal line 37e are provided adjacent to the FPC main body 37a. The GND pattern 37b is connected to a GND signal line (ground signal line) provided on the printed circuit board 23, and one surface (insulating surface) is composed of an insulator (covered with an insulating layer) and the other surface. The (conductive surface) is composed of a conductor. That is, the conductor is exposed on the other side. The FPC relay unit 37c connects the FPC main body unit 37a and the GND pattern 37b, and the GND pattern 37b is provided via the FPC relay unit 37c in a direction orthogonal to the longitudinal direction of the FPC main body unit 37a.

The FPC 37 is held by sticking the surface of the FPC main body 37a to the first surface 38a of the FPC holding sheet metal 38 with a double-sided tape or an adhesive (not shown). The GND pattern 37b abuts on the second surface 38b on the side opposite to the first surface 38a of the FPC holding sheet metal 38 to which the FPC main body 37a is attached by bending the FPC relay portion 37c once. There is.

As shown in FIGS. 6 and 9, the width B of the GND pattern 37b is narrower than the width A of the FPC main body 37a in the lateral direction. Further, the width B of the GND pattern 37b is narrower than the width C of the FPC holding sheet metal 38. With such a configuration, the width A of the FPC main body 37a and the width C of the FPC holding sheet metal 38 can be made smaller than, for example, as compared with the case where the FPC main body 37a is provided with the GND pattern 37b in which the conductor is exposed. Can be done. Therefore, it is possible to avoid the device from becoming large and improve the space efficiency. Although the figure is shown in FIG. 9 with a gap between the parts for easy understanding, the FPC main body 37a is actually attached to the FPC holding sheet metal 38 with double-sided tape or the like as described above. , There are almost no gaps as shown. Further, there is no gap between the protrusion 38c and the GND pattern 37b and between the GND pattern 37b and the guide cylinder 19 in a state of being in contact with each other.

As shown in FIGS. 7 to 9, the FPC holding sheet metal 38 is held on the inner peripheral surface 19a of the guide cylinder 19 with the first surface 38a to which the FPC main body 37a is attached as the inner diameter side of the interchangeable lens 50. ing. The GND pattern 37b arranged on the second surface 38b of the FPC holding sheet metal 38 is sandwiched between the protrusion 38c and the inner peripheral surface 19a of the guide cylinder 19. The FPC holding sheet metal 38 is made of an elastic metal sheet metal, and the hook portion 38d and the tip spring portion 38e are charged (biased) with respect to the guide cylinder 19. Then, the protrusion 38c is held in a state of being pressed against the inner diameter side of the guide cylinder 19 by the urging force F1 by the hook portion 38d and the urging force F2 by the tip spring portion 38e. Therefore, the GND pattern 37b is sandwiched between the protrusion 38c and the guide cylinder 19 in a state of being in pressure contact with each other, and the GND pattern 37b and the protrusion 38c can be surely brought into contact with each other to ensure continuity.

In the configuration in which the FPC main body 37a having the motor drive signal line 37d and the sensor output signal line 37e is attached to the FPC holding sheet metal 38, the FPC holding sheet metal 38 and the motor drive signal line 37d are electrostatically charged with the insulating layer of the FPC 37 interposed therebetween. Has capacity. Further, the FPC holding sheet metal 38 and the sensor output signal line 37e also have a capacitance with the insulating layer of the FPC 37 interposed therebetween. Therefore, if the FPC holding sheet metal 38 is not connected to the ground, when the motor drive signal line 37d is energized to drive the ultrasonic motor unit 30, the electric charge in the FPC holding sheet metal 38 swings and a potential difference occurs. Sometimes. Due to the potential fluctuation of the FPC holding sheet metal 38, the potential of the sensor output signal line 37e also fluctuates, and noise is superimposed on the sensor output signal. Therefore, there is a concern that the accuracy of the position control of the second group lens barrel 8 deteriorates and the control cannot be performed correctly.

In the first embodiment, the GND pattern 37b is pressed against the FPC holding sheet metal 38 to ensure conduction, and the FPC holding sheet metal 38 is connected to the ground via the FPC 37. Therefore, it is possible to prevent noise caused by the drive signal for driving the ultrasonic motor unit 30 from being superimposed on the sensor output signal, and to prevent deterioration of the accuracy of position control of the second group lens barrel 8.

As a method of connecting the FPC holding sheet metal 38 to the ground, a lead wire may be used separately, or the guide cylinder 19 may be separately grounded after the FPC holding sheet metal 38 is screwed to the guide cylinder 19 whose surface treatment has been partially peeled off. Methods such as connecting are also conceivable. However, the number of parts and the number of assembly steps increase, resulting in an increase in cost. Further, when the guide cylinder 19 is made of resin or the like and is non-conductive, the above method is not effective. The configuration of the first embodiment has an excellent effect that noise countermeasures can be taken without increasing the number of parts, assembling man-hours, and cost.

(Example 2)
Example 2 of the present invention will be described with reference to FIGS. 10 and 11. Since the configuration of the interchangeable lens 50 is basically the same as that of the first embodiment, the parts having the same configuration are designated by the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted and only the different parts will be described.

The second embodiment is different from the first embodiment in that the FPC 237 is held by the FPC holding sheet metal 38. FIG. 10 is a cross-sectional view of the FPC 237 according to the second embodiment. FIG. 11 is a development view of a main part of FPC237. The FPC 237 of the second embodiment includes an FPC relay portion 237c in which the GND pattern 237b extends in a direction away from the FPC 237, and a first FPC bending portion 237c1 and a second FPC bending portion 237c2 at both ends of the FPC relay portion 237c. It is configured. The FPC 237 is held in a state where the back surface of the FPC main body 237a is attached to the FPC holding sheet metal 38 with a double-sided tape or an adhesive (not shown). That is, in the attachment of the FPC 237 of the second embodiment, the surfaces of the FPC main body portion 237a attached to the FPC holding sheet metal 38 are upside down with respect to the first embodiment. Therefore, in order to bring the conductor of the GND pattern 237b into contact with the surface of the FPC holding sheet metal 38 to which the FPC main body portion 237a is attached, the first FPC bending portion 237c1 and the second FPC bending It is necessary to bend the portion 237c2 twice. In order to bend twice in this way, the distance between the first FPC bending portion 237c1 and the second FPC bending portion 237c2 is long. Then, by bending twice as described above, the surface where the conductor of the GND pattern 237b is exposed can be brought into contact with the FPC holding sheet metal 38. Similar to the first embodiment, the width of the GND pattern 237b is narrower than the width of the FPC main body 237a. Further, the width of the GND pattern 237b is also narrower than the width of the FPC holding sheet metal 38.

Although the figure is shown in FIG. 10 with a gap provided between the parts for easy understanding, the FPC main body 237a is actually attached to the FPC holding sheet metal 38 with double-sided tape or the like, and is shown. There is almost no such gap. Further, there is no gap between the protrusion 38c and the GND pattern 237b and between the first FPC bending portion 237c1 and the second FPC bending portion 237c2 and the guide cylinder 19 in a state of contact.

Similar to the first embodiment, the FPC holding sheet metal 38 is held by being pressed against the inner peripheral surface 19a of the guide cylinder 19 with the surface to which the FPC main body 237a is attached on the inner diameter side. The GND pattern 237b sandwiched between the protrusion 38c and the guide cylinder 19 is also sandwiched in a state of being pressed against the inner peripheral surface 19a between the protrusion 38c and the guide cylinder 19 as in the first embodiment. Therefore, the GND pattern 237b and the protrusion 38c can be reliably brought into contact with each other to ensure continuity.

By adopting the configuration of the second embodiment, even if the surfaces of the FPC main body 237a attached to the FPC holding sheet metal 38 are upside down with respect to the first embodiment, noise superposition is caused as in the first embodiment. The effect can be obtained. Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

19 Guide tube (lens barrel member)
19a Inner peripheral surface 23 Printed circuit board (circuit board)
37 FPC (Flexible Substrate)
37a FPC main body (main body)
37b GND pattern (connection part)
37c FPC relay section (relay section)
38 FPC holding sheet metal (holding member)
38a First surface 38b Second surface 50 Interchangeable lens (optical device)

Claims (15)

Flexible board and
A conductive holding member for holding the flexible substrate and
A lens barrel member that holds the holding member by the inner peripheral surface, and
It has a circuit board to which the flexible board is connected.
The flexible substrate comprises a main body portion held by the first surface of the holding member, a connection portion connected to the ground signal line of the circuit board, and a relay portion connecting the main body portion and the connection portion. Including
The optical device is characterized in that the connecting portion is sandwiched between the second surface of the holding member and the lens barrel member. The optical device according to claim 1, wherein the connecting portion abuts on the second surface in a state where the relay portion is bent once. The optical device according to claim 1, wherein the connecting portion abuts on the second surface in a state where the relay portion is bent twice. The optical device according to any one of claims 1 to 3, wherein the connecting portion includes a conductive surface that abuts on the second surface. The optical device according to claim 4, wherein the connecting portion includes an insulating surface provided on a side opposite to the conductive surface. The optical device according to any one of claims 1 to 5, wherein the holding member has elasticity, and the connecting portion is pressed against the lens barrel member by an urging force due to the elasticity. The optical device according to any one of claims 1 to 6, wherein the width of the connecting portion is narrower than the width of the main body portion. The optical device according to any one of claims 1 to 7, wherein the width of the connecting portion is narrower than the width of the holding member. The optical device according to any one of claims 1 to 8, wherein the connecting portion is provided via the relay portion in a direction orthogonal to the longitudinal direction of the main body portion. The optical device according to any one of claims 1 to 9, wherein the relay unit includes a ground signal line. The optical device according to any one of claims 1 to 10, wherein the second surface includes a protrusion, and the connection portion abuts on the protrusion. Optical members and
A driving means for moving the optical member and
It has a detecting means for detecting the position of the optical member, and has
The optics according to any one of claims 1 to 11, wherein the main body includes a first signal line connected to the driving means and a second signal line connected to the detecting means. apparatus. The optical device according to claim 12, wherein the circuit board includes a control means for controlling the drive means. The optical device according to claim 12 or 13, wherein the driving means is an ultrasonic motor driven by ultrasonic vibration. An imaging device comprising the optical device according to any one of claims 1 to 14.

Images