Optical device and imaging device

Abstract

To provide an optical device that is resistant against external impact.SOLUTION: A lens barrel 30 comprises: an imaging optical system that includes a plurality of optical elements; rear-side stationary barrel 12; a front-side stationary barrel 13 that is held by the rear-side stationary barrel 12; an FPC 26 that is arranged to extend over the rear-side stationary barrel 12 and the front-side stationary barrel 13; hook parts 12a, 12b that are provided on the rear-side stationary barrel 12 and regulate the position in a thickness direction of the FPC 26 and one position in a direction perpendicular to the thickness direction; and hook parts 13a, 13b that are provided on the front-side stationary barrel 13 and regulate the position in the thickness direction of the FPC 26 and the other position in the direction perpendicular to the thickness direction. Regulating the FPC 26 with the hook parts 12a, 12b and the hook parts 13a, 13b forms an FPC bent part 26d and holds the FPC 26.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an optical device and an imaging device. [Background technology]

[0002] A flexible printed circuit board (hereafter referred to as FPC) is built into the lens barrel to accommodate the layout of the actuators and position sensors. Because the FPC is thin, light, and flexible, it can be easily fixed to the lens barrel with, for example, double-sided tape.

[0003] For example, Patent Document 1 discloses a lens barrel having a configuration for fixing a PFC so as to suppress bending of an FPC in a guide tube fixed to a fixed barrel, and Patent Document 2 discloses a lens barrel having a configuration for fixing an FPC to a fixed member by providing a bending portion in order to prevent misalignment of a Hall element. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-191164 A [Patent Document 2] JP 2016-157040 A Summary of the Invention [Problem to be solved by the invention]

[0005] Simply fixing the FPC to suppress bending as in Patent Document 1, or simply fixing the FPC by providing a flexible section to absorb mounting misalignment as in Patent Document 2, could result in the FPC breaking due to the impact force applied to the lens barrel.

[0006] An object of the present invention is to provide an optical device that is resistant to external shocks. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a photographing optical system including an optical element, A device disposed radially outward of the imaging optical system No. 1 and the second cylindrical The material, before Note 1 and Second Cylindrical Materials Along the surface of A flexible printed circuit board is arranged the first and second cylindrical members are adjacent to each other in the optical axis direction, and the flexible printed circuit board is disposed so as to straddle a boundary between the first and second cylindrical members in the optical axis direction, The first Cylindrical Materials The surface of To teeth , the flexible printed circuit board Radial The location of In the optical axis direction On the other hand Side A first holding portion that regulates the position is established. , the second Cylindrical Materials The surface of To teeth , the flexible printed circuit board Radial The location of In the optical axis direction The other Side A second holding portion that regulates the position is established. , the first and Second holding part In between, The flexible printed circuit board has a bent portion. attitude It is characterized by the above. Effect of the Invention

[0008] According to the present invention, it is possible to provide an optical device that is resistant to external shocks. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view of a camera system according to a first embodiment of the present invention. [Diagram 2] 1 is a system block diagram of a camera system according to a first embodiment of the present invention. [Diagram 3] 3A and 3B are partial cross-sectional views showing a holding structure for an FPC 26 according to the first embodiment of the present invention. [Figure 4] 5A and 5B are partial cross-sectional views showing a holding structure for an FPC 26 according to a first modified example of the present invention. [Diagram 5]1A is a plan view of an FPC 26 according to a first embodiment of the present invention, FIG. 1B is a plan view of an FPC 26 according to a first modified example of the present invention, and FIG. 1C is a plan view of an FPC 26 according to a second modified example of the present invention. [Figure 6] 11 is a perspective view showing a holding state of an FPC 26 according to a second modified example of the first embodiment of the present invention. FIG. [Figure 7] FIG. 11 is a cross-sectional view of a moving lens group according to Example 2 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Example 1 The present invention will be described in detail below based on the embodiments of the drawings. FIG. 1 shows a cross-sectional view of a camera system including a lens barrel 30 (optical device) and a camera body 50 according to a first embodiment of the present invention. The lens barrel 30 shown in FIG. 1 is an interchangeable lens having an optical vibration isolation unit in a wide-angle (WIDE) shooting state, and has a variable magnification optical system (photographing optical system) consisting of seven groups. Each variable magnification optical system is a first lens group L1, a second lens group L2, a third lens group L3 and a fourth lens group L4 that move in a plane perpendicular to the optical axis (radial plane) to perform shake correction, and a fifth lens group L5, a sixth lens group L6, and a seventh lens group L7 that perform focusing by moving forward and backward in the direction of the optical axis OL. In addition, the first lens group L1 to the sixth lens group L6 each move forward and backward in the direction of the optical axis OL to perform a variable magnification operation. In this way, the lens barrel 30 is composed of a photographing optical system including a plurality of lens groups (optical elements).

[0011] The first lens L1 is held by a first lens barrel 1. The first lens barrel 1 is held by a first base 2, and optical adjustment is performed by moving the first lens barrel 1 in the direction of the optical axis OL and on the radial plane.

[0012] The linear barrel 3 and the first lens group L1 move forward and backward together with the zoom operation, but in the first embodiment, they are supported by a separate support structure (not shown) and move. The cosmetic ring 4 has specifications of the lens barrel 30 printed on it, and the cosmetic ring 4 is fixed to the linear barrel 3 with screws and forms the outer appearance.

[0013] The second lens group L2 is held by a second lens group barrel 5. Optical adjustment is performed by moving the second lens group barrel 5 on the radial plane.

[0014] The aperture unit 6, which adjusts the amount of light, has a plurality of light-shielding blades. The plurality of light-shielding blades of the aperture unit 6 are driven by a stepping motor (not shown) as a drive source, making it possible to set a desired F-number.

[0015] The third lens group L3 moves within the radial plane to perform an optical vibration reduction function for correcting vibration. The function of the optical vibration reduction unit according to the embodiment of the present invention will be described later.

[0016] The fourth group lens L4 is held by a fourth group barrel 7. The fourth group barrel 7 is held by a focus group base 8, and optical adjustment is performed by moving the fourth group barrel 7 in the direction of the optical axis OL and in a direction perpendicular to the optical axis (radial direction).

[0017] The fifth group lens L5 (focus lens) is held by a fifth group barrel 9, which is supported so as to be movable forward and backward along the optical axis OL by a drive mechanism (e.g., an ultrasonic motor unit) and a linear guide mechanism (not shown), and a focusing operation is performed by the operation of the drive mechanism. This linear guide mechanism uses two cylindrical members that extend in the direction of the optical axis OL, so-called guide bars, one of which determines the inclination / eccentricity of the fifth group barrel 9, and the other determines the rotational position around the optical axis OL. The fifth group barrel 9 is supported so as to be movable forward and backward along the guide bar.

[0018] The sixth group lens L6 is held by a sixth group barrel 10. The sixth group barrel 10 is fixed to the focus group base 8 with screws.

[0019] The mount 11 has a bayonet portion for attaching the lens barrel 30 to the camera body 50, and is fixed to the rear fixed barrel 12 (first base member) with screws. The front fixed barrel 13 (second base member) is fixed to the subject side of the rear fixed barrel 12 with screws. Furthermore, fixed to the rear fixed barrel 12 are a guide barrel 14, an outer barrel 15, a lens driving IC, a printed circuit board 16 on which a microcomputer, etc. are arranged.

[0020] A seventh group barrel 17 that holds a seventh group lens L7 is fixed to the guide barrel 14 with screws. Furthermore, a cam barrel 18 that can only rotate around the optical axis OL by rollers (not shown) is fitted to the outer periphery of the guide barrel 14. In the first embodiment, the first group base 2, the rectilinear barrel 3, and the focus group base 8 are engaged with the guide barrel 14 and the cam barrel 18 by rollers, and the intersection between the guide groove in the optical axis OL direction provided on the guide barrel 14 and the cam groove provided on the cam barrel 18 moves as the cam barrel 18 rotates. Accordingly, the barrels and optical units of each group can advance and retreat in the direction of the optical axis OL.

[0021] A switch (not shown) for switching between MF (manual focus) and AF (autofocus) and IS mode is disposed on the outer peripheral surface of the outer tube 15 fixed to the rear fixed tube 12 with a screw. A gyro sensor (angular velocity sensor 39) (not shown) fixed to the outer tube 15 is connected to the printed circuit board 16. The gyro sensor detects the angular velocity of each of the vertical (pitch direction) shake and the horizontal (yaw direction) shake, which are the angular shake of the camera system. A back cover 19 is fixed to the mount 11 fixed to the rear fixed tube 12 with a screw.

[0022] The mount barrel 20 is fixed by being sandwiched between the rear fixed barrel 12 and the mount 11. In the lens barrel 30 of the first embodiment, the focal position on the imaging section 58 (imaging element) can be adjusted by adjusting the thickness of the mount barrel 20 in the direction of the optical axis OL by processing or the like.

[0023] A contact block (not shown) is connected to the printed circuit board 16 by wiring (not shown) (such as a flexible printed circuit board), and is fixed to the mount 11 with screws.

[0024] The focus operation ring 21 (operation member) is disposed radially outside the front fixed barrel 13 and is supported in a fixed position so as to be rotatable about the front fixed barrel 13. When the focus operation ring 21 is rotated, a sensor (not shown) detects the rotation and drives the fifth group barrel 9 according to the amount of rotation, thereby controlling the focusing of the fifth group lens L5.

[0025] The function operation ring 22 (operation member) is disposed radially outside the front fixed barrel 13 and is supported rotatably at a fixed position with the front fixed barrel 13 as an axis, and when the photographer operates the function operation ring 22, a desired shooting state can be set. The front cover 23 is fixed to the front fixed barrel 13 with screws (not shown) and restricts the movement of the function operation ring 22 toward the subject. When the photographer rotates the function operation ring 22, the rotation (movement) is detected by a sensor (detection means) (not shown), and a signal from the detection means is transmitted to a shooting control means (not shown) by a flexible printed circuit board. The shooting control means controls the aperture unit 6 according to the amount of rotation and changes it to a desired F-number (shooting state). In the first embodiment, it is also possible to assign a change in a shooting condition other than the F-number, such as ISO sensitivity or shutter speed, to the function operation ring 22.

[0026] The zoom operation ring 24 (operation member) is rotatably supported by the rear fixed barrel 12. A wave washer 25, which is a thrust biasing member, is sandwiched between the zoom operation ring 24 and the rear fixed barrel 12, thereby constituting a thrust biasing structure that biases the zoom operation ring 24 in the optical axis direction.

[0027] The flexible printed circuit board supplies power to the actuators and sensors and transmits sensor signals, and is referred to in this specification as FPC 26. In the first embodiment, the FPC 26 serves to transmit signals for detecting the rotation of the above-mentioned function operation ring 22 and focus operation ring 21 to the printed circuit board 16. When the FPC 26 is disposed inside the lens barrel 30, it is partially attached along the inner surfaces of the front fixed barrel 13 and the rear fixed barrel 12 with double-sided tape, adhesive, or the like.

[0028] The reinforcing plates 27a and 27b hold the FPC 26 at a desired position, separately from the double-sided tape described above. In detail, the reinforcing plates 27a and 27b are held by the hook parts 12a and 12b (first holding parts) and the hook parts 13a and 13b (second holding parts) that hold the FPC 26, which will be described later. By this holding method, an FPC bent part 26d is formed between the two reinforcing plates 27a and 27b, and the FPC 26 is maintained in a partially bent state. The details of this mounting method will be described later. When the lens barrel 30 is zoomed, the rectilinear barrel 3 moves along the optical axis OL toward the focal plane (in this figure, toward the camera body 50), but of course the FPC bent part 26d and the rectilinear barrel 3 do not interfere with each other.

[0029] The cam barrel 18 and the zoom operation ring 24 are connected by a zoom key (not shown), and when the photographer rotates the zoom operation ring 24, the cam barrel 18 rotates. The position (thrust position) of the zoom operation ring 24 in the direction of the optical axis OL is determined by bayonet engagement (not shown) with the rear fixed barrel 12.

[0030] The rotation of the cam barrel 18 is detected by a sensor (not shown), and the zoom position corresponding to the amount of rotation is determined from the detected signal by an IC mounted on the printed circuit board 16, and focus, vibration reduction, and aperture control are performed according to the zoom position.

[0031] Lens barrel 30 of Example 1 is detachably bayonet-fixed to camera body 50, which is an imaging device, by mount 11. When lens barrel 30 is fixed to camera body 50 by mount 11, printed circuit board 16, which controls the operation of each lens group, becomes capable of communicating with camera body 50 via a contact block (not shown).

[0032] The imaging unit 58 is mounted on the camera body 50 and is an optical-electrical conversion element (imaging element) such as a CMOS or CCD that receives light from a subject that has passed through the lens barrel 30 and converts the light into an electrical signal.

[0033] FIG. 2 is a system block diagram of a camera system composed of a lens barrel 30 and a camera body 50. First, the control flow in the camera body 50 will be described. The camera CPU 52 is composed of a microcomputer. The camera CPU 52 controls the operation of each part in the camera body 50. When the lens barrel 30 is attached, the camera CPU 52 communicates with the lens CPU 32 provided in the lens barrel 30 via the lens side electrical contact 31 and the camera side electrical contact 51. The information (signal) that the camera CPU 52 transmits to the lens CPU 32 includes drive amount information, translation shake information, and focus shake information of the fifth group lens L5. The information (signal) that the lens CPU 32 transmits to the camera CPU 52 includes imaging magnification information. The lens side electrical contact 31 and the camera side electrical contact 51 include contacts for supplying power from the camera body 50 to the lens barrel 30.

[0034] The power switch 53 is a switch that can be operated by the photographer, and can start the camera CPU 52 and start the power supply to each actuator, sensor, etc. in the camera system. The release switch 54 is a switch that can be operated by the photographer, and has a first stroke switch SW1 and a second stroke switch SW2. A signal from the release switch 54 is input to the camera CPU 52. In response to the input of an ON signal from the first stroke switch SW1, the camera CPU 52 enters a shooting preparation state. In the shooting preparation state, the luminance of the subject is measured by the photometry unit 55, and the focus detection unit 56 detects the focus.

[0035] The camera CPU 52 calculates the aperture value of the aperture unit 6 and the exposure amount (shutter time) of the image sensor of the imaging section 58 based on the photometry result by the photometry section 55. The camera CPU 52 also determines the drive amount (including the drive direction) of the fifth group lens L5 and the fifth group barrel 9 to obtain a focused state for the subject based on focus information (defocus amount and defocus direction) which is the detection result of the focus state of the photographing optical system by the focus detection section 56. The drive amount information (drive amount information of the fifth group lens L5) is transmitted to the lens CPU 32. The lens CPU 32 controls the operation of each component of the lens barrel 30.

[0036] Furthermore, when the camera CPU 52 is in a predetermined shooting mode, it starts to control the shift drive of the shift lens barrel constituting the optical vibration isolation unit, i.e., the vibration isolation operation. When an ON signal is input from the second stroke switch SW2, the camera CPU 52 sends an aperture drive command to the lens CPU 32, and sets the aperture unit 6 to the aperture value previously calculated. The camera CPU 52 also sends an exposure start command to the exposure section 57, and causes it to perform a retraction operation of a mirror (not shown) and an opening operation of a shutter (not shown), and causes the image sensor of the image pickup section 58 to perform photoelectric conversion of the subject image, i.e., an exposure operation.

[0037] The imaging signal from the imaging unit 58 is converted into a digital signal by a signal processing unit in the camera CPU 52, and then subjected to various correction processes before being output as an image signal. The image signal (data) is recorded and stored in an image recording unit 59, such as a semiconductor memory, such as a flash memory, a magnetic disk, or an optical disk.

[0038] Next, a control flow in the lens barrel 30 will be described. The F ring rotation detection unit 33 (detection means) includes the function operation ring 22 and a sensor (not shown) that detects its rotation. The MF ring rotation detection unit 34 includes the focus operation ring 21 and a sensor (not shown) that detects its rotation. The ZOOM ring rotation detection unit 35 includes the zoom operation ring 24 and a sensor (not shown) that detects its rotation.

[0039] The IS driver 36 includes a drive actuator for the shift barrel that performs the vibration isolation operation and its drive circuit. The AF driver 37 performs AF drive of the fifth group barrel 9 through an AF motor (ultrasonic motor unit) in accordance with drive amount information of the fifth group lens L5 transmitted from the camera CPU 52.

[0040] The electromagnetic aperture driver 38 is controlled by the lens CPU 32 which receives an aperture drive command from the camera CPU 52, and operates the aperture unit 6 to an open state corresponding to a specified aperture value.

[0041] The angular velocity sensor 39 detects the angular velocities of vertical and horizontal shake, which are angular shake of the camera system, and outputs the detected values ​​as angular velocity signals to the lens CPU 32. The lens CPU 32 electrically or mechanically integrates the angular velocity signals in the pitch and yaw directions from the angular velocity sensor 39 to calculate the pitch direction shake amount and yaw direction shake amount (collectively referred to as angular shake amount), which are the amounts of displacement in the respective directions.

[0042] The lens CPU 32 controls the IS driver 36 based on the composite displacement amount of the angular shake amount and the translational shake amount described above to shift and drive the shift barrel, thereby performing angular shake correction and translational shake correction. Also, the lens CPU 32 controls the AF driver 37 based on the focus shake amount to drive the fifth group barrel 9 in the optical axis direction, thereby performing focus shake correction.

[0043] Next, a holding structure for holding the FPC 26 on the front fixed barrel 13 and the rear fixed barrel 12 will be described with reference to Figs. 3(A), (B) and 5(A). Figs. 3(A) and (B) are enlarged partial cross-sectional views showing the holding structure (holding state) of the FPC 26. Fig. 5(A) is a plan view of the FPC 26 according to the first embodiment. On the surface of the FPC 26, rectangular reinforcing plates 27a and 27b are provided at a certain interval so as to be perpendicular to the longitudinal direction of the FPC 26. The rear fixed barrel 12 is provided with hook portions 12a and 12b for holding the FPC 26, and the reinforcing plate 27a is housed in the hook portions 12a and 12b, thereby restricting the position of the FPC 26 in the thickness direction and one of the positions in the direction perpendicular to the thickness direction (the direction of the optical axis OL). Similarly, the front fixed barrel 13 is provided with hook portions 13a and 13b for holding the FPC 26, and the reinforcing plate 27b is housed in the hook portions 13a and 13b, thereby restricting the position of the FPC 26 in the thickness direction and the other position in the direction perpendicular to the thickness direction (the direction of the optical axis OL). That is, the FPC 26 is arranged and held so as to straddle the rear fixed barrel 12 and the front fixed barrel 13 (see FIG. 6). Note that, although the hook portions 12a and 12b are actually arranged as a pair, the hook portion 12a is shown as a representative in the drawings for the sake of explanation, and the hook portion 12b is omitted. Similarly, the hook portions 13a and 13b are shown as a representative with the hook portion 13a shown.

[0044] Since the reinforcing plates 27a and 27b are arranged at a fixed interval in the direction of the optical axis OL on the FPC 26, only the flexible sheet-like FPC 26 is between the reinforcing plates 27a and 27b. Therefore, when assembling the FPC 26, as shown in Fig. 3(A), the sheet portion 26c of the FPC 26 between the reinforcing plates 27a and 27b is pinched with fingers or a special tool, and the FPC 26 is slid between the hook portions 12a and 13a and the rear fixed tube 12. Naturally, when the fingers are released (or the special tool is removed), the sheet portion 26c between the reinforcing plates 27a and 27b forms a bending portion (FPC bending portion 26d), resulting in the holding state shown in Fig. 3(B).

[0045] At this time, the reinforcing plate 27a abuts against the hook portion 12a, and the movement in the upward direction of the paper is restricted. Similarly, the reinforcing plate 27b abuts against the hook portion 13a, and the movement in the upward direction of the paper is restricted. The length of the FPC 26 at the portion where the reinforcing plates 27a and 27b are provided is set to be longer than the interval (restriction range) between the hook portion 12a and the hook portion 13a in the direction of the optical axis OL. Therefore, the FPC 26 is held between the reinforcing plates 27a and 27b while being bent, that is, while the FPC bent portion 26d is formed. In the first embodiment, the FPC 26 is restricted by the hook portion 12a and the hook portion 13a, and the FPC bent portion 26d is formed in the FPC 26, and the FPC 26 is held. Furthermore, since the thickness direction is also restricted, the FPC 26 does not float up, and the inner diameter R of the FPC bent portion 26d is determined. To remove the FPC 26, for example, the FPC bent portion 26d can be pulled with a tool such as tweezers, and the FPC can be easily removed.

[0046] (Variation 1) Next, a first modified example of the FPC 26 according to the first embodiment will be described with reference to Figs. 4(A), (B) and 5(B). Figs. 4(A) and (B) are enlarged partial cross-sectional views showing the holding structure (holding state) of the FPC 26 of the first modified example. Fig. 5(B) is a plan view of the FPC 26 of the first modified example. The FPC 26 of the first embodiment has reinforcing plates 27a and 27b arranged at a certain interval, whereas the FPC 26 of the first modified example does not have the reinforcing plates 27a and 27b. The FPC 26 of the first modified example has two ears 26a and 26b formed at an interval along the optical axis OL in a direction perpendicular to the optical axis OL. The FPC 26 has a restoring force that returns its bending to its original state, so that the ears 26a and 26b are held by the hooks 12a and 13a as shown in Fig. 4(B), and thus the FPC 26 can be held in a state in which the FPC bent portion 26d is formed.

[0047] Next, the effect of this embodiment will be described. When an inertial force or an external force due to an impact or the like (such as when the photographer drops the camera) is applied to the lens barrel 30, the front fixed barrel 13 and the rear fixed barrel 12 may be deformed. In that case, if the FPC 26 is fixed to the front fixed barrel 13 and the rear fixed barrel 12 with double-sided tape or the like as in the past in order to prevent the flexible FPC 26 from floating up, this deformation may apply a force to the FPC 26, which may cause the FPC 26 to break. In addition, the front fixed barrel 13 and the rear fixed barrel 12 have fixing screws, and if the amount of deformation is small, the possibility of the FPC 26 being damaged may be low. However, this may reduce the degree of freedom in arranging the fixing screws, and measures such as increasing the number of fixing screws may be required.

[0048] There is also a method of fixing the FPC 26 while allowing it to float, as in the prior art. However, there is a concern that interference with other components may occur, and the device may become larger if a sufficient gap is provided between the FPC 26 and other components. Furthermore, there is a risk that unnecessary light may escape through the sufficient gap and enter the imaging element, causing degradation of image quality.

[0049] In the first embodiment, the range for pressing the FPC 26 with a double-sided tape or the like is partial, and the FPC bent portion 26d is formed by an attachment method utilizing the hook portions 12a and 13a and the reinforcing plates 27a and 27b, so that the FPC 26 is prevented from being broken. According to the first embodiment of the present invention, an optical device having a simple structure and being resistant to external impacts can be provided.

[0050] (Modification 2) Next, a second modification of the FPC 26 according to the first embodiment will be described with reference to FIGS. 5(C) and 6. FIG. 5(C) is a plan view of a second modification of the FPC 26 according to the first embodiment of the present invention. FIG. 6 is a perspective view showing the holding state of the FPC 26 according to the first embodiment and the second modification of the present invention. A concave groove 12c (concave groove portion) having a width W1 is provided on the inner surface of the rear fixing cylinder 12, and the FPC 26 is routed inside the concave groove 12c. Similarly, a concave groove 13c (concave groove portion) having a width W2 is provided on the inner surface of the front fixing cylinder 13, and the FPC 26 is routed inside the concave groove 13c. The FPC bent portion 26d between the reinforcing plate 27a and the reinforcing plate 27b has a width H0 in the first embodiment. And in the first embodiment, the relationship among the width W1, the width W2, and the width H0 is the following inequality (1). H0 < W1 and H0 < W2 ···(1)

[0051] Also, there is a gap between the straight cylinder 3 of the lens barrel 30 and the front cover 23 (see FIG. 1), and unnecessary light incident from the gap passes through the inside of the front fixing cylinder 13 and the rear fixing cylinder 12 and reaches the imaging unit 58, which may deteriorate the optical performance. Furthermore, since the concave grooves 12c and 13c having the widths W1 and W2 are formed, a space expands inside the lens barrel 30, and unnecessary light is more likely to enter. Therefore, by expanding the width H0 of the FPC bent portion 26d to the width H1 as in the second modification, the relationship of the inequality (1) is changed to the following inequality (2). H1 > W1 and H1 > W2 ···(2)

[0052] Inequality (2) means that width H1 of FPC bent portion 26d is wider than widths W1 and W2 of grooves 12c and 13c. This relationship makes it possible to overlap widths W1 and W2 with FPC bent portion 26d having width H1, and therefore allows unwanted light passing through widths W1 and W2 to be blocked by FPC bent portion 26d.

[0053] According to the second modification, in addition to the effects of the first embodiment, it is possible, with a simple configuration, to block unnecessary light from the outside passing through the lens barrel 30. Furthermore, by coloring the FPC bent portion 26d black, the light blocking effect can be enhanced.

[0054] Example 2 7 is a cross-sectional view of a moving lens group according to Example 2 of the present invention. Below, configurations different from Example 1 will be described in detail, and descriptions of the same configurations will be omitted. In Example 1, the FPC 26 is held by the front fixed barrel 13 and the rear fixed barrel 12, which do not move, but in Example 2, the FPC 226 is fixed to the moving group 240.

[0055] In the second embodiment, the lens group L is held by a moving group 240 (moving member) and is movable in the direction of the optical axis OL. A roller 241 is fixed to the moving group 240 and is provided to engage with the guide cylinder 14 and the cam cylinder 18. The roller 241 is held by the guide cylinder 14 so as to be movable along the direction of the optical axis OL, engages with a cam groove (not shown) provided in the cam cylinder 18, and is movable in the direction of the optical axis OL along the locus of the cam groove (not shown) as the cam cylinder 18 rotates. Such rollers 241 are provided in a total of three places in the moving group 240, and are movable in the direction of the optical axis OL while maintaining the tilt of the moving group 240 with respect to the optical axis OL, i.e., the eccentric position.

[0056] The front moving base 213 (second base member) is a member that holds the lens group L. The rear moving base 212 (first base member) is a member that holds the rollers 241. The front moving base 213 is fixed to the rear moving base 212, and these members form the moving group 240. The front moving base 213 and the rear moving base 212 are also moving members that move to a desired optical position in response to shooting.

[0057] The moving group 240 is equipped with sensors and actuators that require electrical current, such as a temperature sensor (not shown), and therefore the FPC 226 is routed around the outer surface of the moving group 240. The FPC 226 is routed across the front moving base 213 and the rear moving base 212 for the convenience of arranging the sensors and actuators. Therefore, in order to prevent the FPC 226 from breaking even if the front moving base 213 or the rear moving base 212 is deformed by the inertial force or external force described above, it is necessary to form an FPC bent portion 226d and hold the FPC 226 as in the first embodiment. In the second embodiment, the FPC 226 is restricted by the hook portion 212a (first holding portion) and the hook portion 213a (second holding portion) that hold the FPC 226, so that the FPC 226 is formed with an FPC bent portion 226d and held. Furthermore, reinforcing plates 227a and 227b may be utilized as necessary. That is, the FPC 226 is disposed and held so as to straddle the front moving base 213 and the rear moving base 212. Note that, although the hook portion 212a is actually a pair of two hook portions 212a and 212b, for the sake of explanation, the drawings show only the hook portion 212a as a representative and omit the display of the hook portion 212b. Similarly, the hook portions 213a and 213b are also shown as a representative with the hook portion 213a being shown.

[0058] In the second embodiment, the FPC bent portion 226d is formed to be located between the moving group 240 and the guide tube 14, and prevents the FPC 226 from breaking, and also serves to block unwanted light entering between the moving group 240 and the guide tube 14. Of course, the FPC bent portion 226d may be configured to be located inside the moving group 240, but detailed explanation of this configuration will be omitted. The FPC 226 arranged in the moving group 240 is U-shaped, and the U-shaped portion rolls in accordance with the movement of the moving group 240, so that the FPC 226 is routed to the guide tube 14, which is a fixed part, without applying a load that may cause breakage to the FPC 226. Then, it can be connected to the printed circuit board 16.

[0059] Although the preferred embodiments and modifications of the present invention have been described above, the present invention is not limited to these embodiments and modifications, and various modifications and changes are possible within the scope of the gist of the present invention. Furthermore, the lens barrel 30 to which the embodiments and modifications of the present invention are applied is used in an imaging device equipped with an image sensor that captures an image formed by the lens barrel 30, or in a camera system equipped with an imaging device body equipped with an image sensor and to which the lens barrel 30 can be detached. [Explanation of symbols]

[0060] 12 Rear fixed cylinder (first base member) 12a, 12b Hook portion (first holding portion) 12c Concave groove (concave groove part) 13 Front fixed cylinder (second base member) 13a, 13b Hook portion (second holding portion) 13c Concave groove (concave groove part) 14 Guide tube 18 Cam barrel 21 Focus operation ring (operation member) 22 Function operation ring 23 Front cover 26, 226 FPC (flexible printed circuit board) 26d, 226d FPC bending part 27a Reinforcement plate 27b Reinforcement plate 30 Lens barrel (optical device) 212 Rear moving base (first base member) 213 Front moving base (second base member) 240 Moving group (moving parts) H1 width W1, W2 width

Claims

1. an imaging optical system including an optical element; First and second cylindrical members disposed radially outward from the photographing optical system; a flexible printed circuit board disposed along a surface of the first and second cylindrical members, the first and second cylindrical members are adjacent to each other in the optical axis direction, the flexible printed circuit board is disposed so as to straddle a boundary between the first and second cylindrical members in an optical axis direction, a first holding portion is provided on the surface of the first cylindrical member to regulate a radial position of the flexible printed circuit board and a position of one side of the flexible printed circuit board in an optical axis direction; a second holding portion is provided on the surface of the second cylindrical member to regulate a radial position of the flexible printed circuit board and a position of the other side in the optical axis direction; 2. An optical device comprising: a flexible printed circuit board having a bent portion formed between the first and second holding portions.

2. The optical device as described in claim 1, characterized in that the bent portion is black.

3. At least one of the first and second cylindrical members is provided with a recess in which the flexible printed circuit board is disposed, 3. The optical device according to claim 1, wherein the width of the bent portion is greater than the width of the recessed portion.

4. An operating member operated by a user; A detection means for detecting the movement of the operating member; a control means for changing a state of the photographing optical system in response to a signal from the detection means; 4. The optical device according to claim 1, wherein the flexible printed circuit board transmits the signal from the detection means to the control means.

5. An optical device described in any one of claims 1 to 4, characterized in that the first and second cylindrical members are fixed cylinders.

6. 5. The optical device according to claim 1, wherein the first and second cylindrical members are movable in an optical axis direction.

7. 7. The optical device according to claim 1, wherein the flexible printed circuit board is provided with a reinforcing plate that is held by each of the first and second holding portions.

8. 8. The optical device according to claim 7, wherein the width of the reinforcing plate is wider than the width of the flexible printed circuit board.

9. An optical device described in any one of claims 1 to 8, characterized in that the second retaining portion overlaps the boundary when viewed in a radial direction.

10. An optical device as described in any one of claims 1 to 9, characterized in that a mount that is detachable from an imaging device is fixed to the image side of the first tubular member, and the second tubular member is fixed to the subject side of the first tubular member.

11. 11. An imaging apparatus comprising: the optical device according to claim 1; and an imaging element for capturing an image formed by the optical device.

Images