Optical apparatus

Abstract

[Problem] To provide a compact optical apparatus. [Solution] An optical apparatus (101) has: a first substrate (500) which has a main flat surface perpendicular to an optical axis (O); second substrates (600, 700) which each have a main flat surface parallel to the optical axis (O); and flexible printed substrates (800, 900). The first substrate (500) and the second substrates (600, 700) are joined to each other. As viewed from the optical axis direction, the second substrates (600, 700) overlap with the flexible printed substrates (800, 900).

Description

optical equipment

[0001] The present invention relates to optical instruments.

[0002] As functions such as autofocus and vibration isolation in optical devices such as interchangeable lenses improve, the size of the control circuits mounted on the circuit boards inside the optical devices increases, resulting in a larger area for the circuit boards.Patent Document 1 discloses an electric board mounting structure including at least one hard board substantially perpendicular to the optical axis, at least one hard board substantially parallel to the optical axis, and a board-to-board connector connecting both hard boards.

[0003] Japanese Patent Application Laid-Open No. 2003-172863

[0004] However, in the structure disclosed in Patent Document 1, the electrical boards cannot be arranged in a space-efficient manner, making it difficult to reduce the size of the optical device.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a compact optical device.

[0006] An optical device according to one aspect of the present invention comprises a first substrate having a main plane perpendicular to an optical axis, a second substrate having a main plane parallel to the optical axis, and a flexible printed circuit board, the first substrate and the second substrate being bonded to each other, and when viewed from the optical axis direction, the second substrate overlaps the flexible printed circuit board.

[0007] Other objects and features of the present invention will be described in the following embodiments.

[0008] According to the present invention, a small-sized optical device can be provided.

[0009] 1 is an external view of an imaging system according to this embodiment. FIG. 2 is a block diagram of an imaging system according to this embodiment. FIG. 3 is a cross-sectional view (retracted state) of an imaging system according to this embodiment. FIG. 4 is a cross-sectional view (extended state) of an imaging system according to this embodiment. FIG. 5 is a perspective view showing a state in which a first substrate, a second substrate, and a third substrate are joined together according to this embodiment. FIG. 6 is a rear view and a cross-sectional view of an interchangeable lens with the first substrate exposed according to this embodiment. FIG. 7 is a perspective view of the first substrate, the image pickup surface side zoom group, and the linear guide barrel according to this embodiment. FIG. 8 is a detailed view of a fixing portion of the linear guide barrel and the flexible printed circuit board according to this embodiment. FIG. 9 is a perspective view of the first substrate, the zoom group, and the flexible printed circuit board according to this embodiment. FIG. 10 is a rear view and a cross-sectional view of the first substrate and the flexible printed circuit board according to this embodiment. FIG. 11 is a side view and a cross-sectional view of the first substrate and the flexible printed circuit board according to this embodiment.

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the same components are given the same reference numerals, and duplicated explanations will be omitted. In this embodiment, an interchangeable lens (lens device) will be described as an example of an optical device, but this embodiment is not limited to this and can also be applied to other optical devices such as a lens-integrated camera.

[0011] 1A and 1B are external views of an image capturing system (camera system) 100 according to this embodiment, with Fig. 1A being a perspective view seen from the front side and Fig. 1B being a perspective view seen from the back side. The image capturing system 100 is configured with a camera body (digital camera) 1 and an interchangeable lens (lens device, optical equipment) 101 that is detachable from the camera body 1.

[0012] As shown in FIG. 1A, the optical axis direction along which the optical axis of the imaging optical system housed in the interchangeable lens 101 extends is defined as the X-axis direction, and two directions that are perpendicular to the optical axis and perpendicular to each other are defined as the Z-axis direction (horizontal direction) and the Y-axis direction (vertical direction). Hereinafter, the Z-axis direction and the Y-axis direction will be collectively referred to as the Z / Y-axis direction. Furthermore, the rotation direction around the Z-axis is defined as the pitch direction, and the rotation direction around the Y-axis is defined as the yaw direction. The pitch direction and yaw direction (pitch / yaw direction) are rotation directions around two axes, the Z-axis and the Y-axis, which are perpendicular to each other.

[0013] A grip section 2 is provided on the left side of the camera body 1 as viewed from the front (the subject side) (the right side as viewed from the rear) for the user to hold the camera body 1 with their hand. A power operation section 3 is also provided on the top surface of the camera body 1. When the user turns on the power operation section 3 while the camera body 1 is in the power-off state, the camera body 1 is turned on and becomes capable of capturing images. When the user turns off the power operation section 3 while the camera body 1 is in the power-on state, the camera body 1 is turned off.

[0014] The top surface of the camera body 1 is provided with a mode dial 4, a release button 5, and an accessory shoe 6. The user can switch between imaging modes by rotating the mode dial 4. The imaging modes include a manual still image capture mode, in which the user can freely set imaging conditions such as shutter speed and aperture value; an auto still image capture mode, in which the camera automatically obtains the appropriate exposure; and a video capture mode for capturing video. The user can also half-press the release button 5 to initiate imaging preparation operations such as autofocus and autoexposure control, and fully press the button to initiate imaging. Accessories such as an external flash and an external viewfinder (EVF), not shown, can be detachably attached to the accessory shoe 6. The camera body 1 also includes an image sensor that photoelectrically converts (captures) a subject image formed by the imaging optical system within the interchangeable lens 101.

[0015] 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 houses an imaging optical system that forms an image of a subject by focusing light from the subject. The outer periphery of the interchangeable lens 101 is provided with a zoom ring 103 that can be rotated around the optical axis by user operation. The outer periphery of the zoom ring 103 is knurled to prevent the user's hand from slipping when operating it. When the user rotates the zoom ring 103, the zoom group that makes up the imaging optical system moves to a predetermined optical position corresponding to the angle of the zoom ring 103. This allows the user to take pictures at a desired angle of view.

[0016] As shown in FIG. 1B , the rear surface of the camera body 1 is provided with a rear operation unit 8 and a display unit 9. The rear operation unit 8 includes a plurality of buttons and dials to which various functions are assigned. When the camera 1 is powered on and the still image or video capture mode is set, the display unit 9 displays a through image of a subject captured by the image sensor. The display unit 9 also displays imaging parameters indicating imaging conditions such as shutter speed and aperture value (F-number). The user can change the settings of the imaging parameters by operating the rear operation unit 8 while viewing the display. The rear operation unit 8 includes a playback button for instructing playback of a recorded captured image. When the user operates the playback button, the captured image is played back and displayed on the display unit 9.

[0017] 2 is a block diagram showing the electrical and optical configuration of the imaging system 100. The camera body 1 has a power supply unit 10 that supplies power to the camera body 1 and the interchangeable lens 101, the power operation unit 3 mentioned above, a mode dial 4, a release button 5, and an operation unit 11 that includes the rear operation unit 8 and the touch panel function of the display unit 9. The camera body 1 and the interchangeable lens 101 as an entire system are controlled by a camera control unit 12 provided in the camera body 1 and a lens control unit 104 provided in the interchangeable lens 101, which work in conjunction with each other.

[0018] The camera control unit 12 reads and executes a computer program stored in the storage unit 13. In doing so, the camera control unit 12 communicates various control signals, data, and the like with the lens control unit 104 via a communication terminal of the electrical contacts 105 provided on the lens mount 102. The electrical contacts 105 include a power supply terminal that supplies power from the power supply unit 10 described above to the interchangeable lens 101.

[0019] The imaging optical system of the interchangeable lens 101 includes a zoom group 110 that is connected to the zoom operation ring 103 and moves in the optical axis direction to change the angle of view, and a lens vibration reduction group 115 that includes a shift lens as an image stabilization element that reduces image blur. The lens vibration reduction group 115 performs vibration reduction operation to reduce image blur by moving (shifting) the shift lens in the Z / Y axis directions perpendicular to the optical axis O. The imaging optical system also includes an aperture group (aperture diaphragm) 201 that adjusts the amount of light, and a focus group 112 that is a movable lens group including a focus lens that moves in the optical axis direction to adjust the focus. The interchangeable lens 101 also includes an image stabilization driver 402 that drives the lens vibration reduction group 115 to shift the shift lens, an aperture driver 202 that drives the aperture group 201, and a focus driver 302 that drives the focus group 112 to move the focus lens.

[0020] The camera body 1 includes a shutter unit 14, a shutter driver 15, an image sensor 16, an image processor 17, and the camera controller 12. The shutter unit 14 controls the amount of light collected by the imaging optical system within the interchangeable lens 101 and exposed to the image sensor 16. The image sensor 16 includes a CMOS (Complementary Metal-Oxide-Semiconductor) sensor and outputs an image signal by photoelectrically converting a subject image (optical image) formed by the imaging optical system. The image processor 17 performs various image processing on the image signal and then generates an image signal. The display 9 displays the image signal (through image) output from the image processor 17, displays the imaging parameters described above, or plays back and displays captured images recorded in the memory unit 13 or a recording medium (not shown).

[0021] The camera control unit 12 controls the driving of the aperture group 201 and the shutter unit 14 via the aperture drive unit 202 and the shutter drive unit 15 in accordance with the setting values ​​of the aperture value and shutter speed received from the operation unit 11. The camera control unit 12 also controls the driving of the focus group 112 in accordance with the image capture preparation operation (half-press operation) on the operation unit 11 (release button 5).

[0022] For example, when an autofocus operation is instructed, the focus detection unit 18 determines the focus state of the subject image formed by the image sensor 16 based on the image signal generated by the image processing unit 17, generates a focus signal, and sends it to the camera control unit 12. At the same time, the focus drive unit 302 detects the current position of the focus group 112 and sends that signal to the camera control unit 12 via the lens control unit 104. The camera control unit 12 compares the focus state of the subject image with the current position of the focus group 112, calculates the focus drive amount from the amount of deviation, and sends it to the lens control unit 104. The lens control unit 104 then controls the drive of the focus group 112 to the target position via the focus drive unit 302, and corrects the focus deviation of the subject image.

[0023] Furthermore, when an automatic exposure control operation is instructed, the camera control unit 12 receives a luminance signal generated by the image processing unit 17 and performs a photometric calculation. Based on the result of the photometric calculation, the camera control unit 12 controls the drive of the aperture group 201 in response to an image capture instruction operation (full press operation) on the operation unit 11 (release button 5). At the same time, the camera control unit 12 controls the drive of the shutter unit 14 via the shutter drive unit 15 and performs exposure processing using the image sensor 16.

[0024] The camera body 1 has a pitch shake detection unit 19 and a yaw shake detection unit 20 as shake detection means capable of detecting image shake due to hand shake or the like by the user. The pitch shake detection unit 19 and the yaw shake detection unit 20 each use an angular velocity sensor (vibration gyro) and an angular acceleration sensor to detect image shake in the pitch direction (rotation direction around the Z axis) and the yaw direction (rotation direction around the Y axis) and output a shake signal. The camera control unit 12 calculates the shift position of the lens vibration isolation group 115 (shift lens) in the Y axis direction using the shake signal from the pitch shake detection unit 19. Similarly, the camera control unit 12 calculates the shift position of the lens vibration isolation group 115 in the Z axis direction using the shake signal from the yaw shake detection unit 20. Then, the camera control unit 12 controls the drive of the lens vibration isolation group 115 to a target position according to the calculated shift positions in the pitch and yaw directions, and performs an image stabilization operation to reduce image shake during exposure and through-image display.

[0025] The interchangeable lens 101 has a zoom 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 ring 103. The zoom detection unit 106 detects the angle of the zoom ring 103 operated by the user as an absolute value, and is configured using, for example, a resistive linear potentiometer. Information about the angle of view detected by the zoom detection unit 106 is sent to the lens control unit 104 and reflected in various controls by the camera control unit 12 described above. Meanwhile, some of the various pieces of information are recorded in the storage unit 13 or a recording medium together with the captured image.

[0026] Next, the positional relationship of the components of the imaging system 100 will be described with reference to Figures 3 and 4. Figures 3 and 4 are cross-sectional views of the imaging system 100 on the XY plane including the optical axis, with Figure 3 showing the zoom retracted state of the interchangeable lens 101 and Figure 4 showing the zoom extended state.

[0027] This embodiment employs a seven-group configuration as an example of an imaging optical system. Each zoom group moves to a predetermined optical position corresponding to the angle of view, and forms an image of light from a subject on the imaging surface of the image sensor 16. In this case, the focus group 112 functions as the second zoom group, and the lens vibration reduction group 115 functions as the fifth zoom group. The imaging optical system also includes a first zoom group 111, an aperture group 201, a third zoom group 113, a fourth zoom group 114, a sixth zoom group 116, and a seventh fixed group 117.

[0028] The zoom group 110 of the imaging optical system has an object-side zoom group 110a and an image plane-side zoom group 110b. The object-side zoom group 110a includes a first zoom group 111. The image plane-side zoom group 110b includes a second zoom group 112, a third zoom group 113, a fourth zoom group 114, a fifth zoom group 115, a sixth zoom group 116, and an aperture group 201, which are connected to one another.

[0029] Note that this embodiment does not limit the configuration of the lens groups, and for example, the vibration reduction lens group 115 may function as a third zoom group. Also, some of the lens groups may not be movable but may be fixed.

[0030] The linear guide barrel 107 is a fixed part that is fixed to a fixed barrel 109 and to the lens mount 102 via the fixed barrel 109. Bayonet claws (not shown) are arranged at equal intervals on the outer peripheral surface of the linear guide barrel 107. Meanwhile, a circumferential groove (not shown) is provided on the inner peripheral surface of the cam barrel 108. Furthermore, the cam barrel 108 is connected to 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 claws and the circumferential groove.

[0031] The linear guide barrel 107 is formed with linear guide grooves that restrict the movement of each zoom group in the rotational direction and guide their linear movement in the optical axis direction. The cam barrel 108 is also formed with cam grooves that correspond to the object-side zoom group 110a and the imager-side zoom group 110b, each with a different angle of rotational locus. The object-side zoom group 110a and the imager-side zoom group 110b are each provided with a cam follower, and each cam follower engages with its corresponding linear guide groove and cam groove. When the user rotates the zoom operation ring 103, the cam barrel 108 rotates, and the cam followers engage with the linear guide grooves and cam grooves to move the object-side zoom group 110a and the imager-side zoom group 110b forward and backward along their respective loci in the optical axis direction.

[0032] 5A and 5B are perspective views showing a state in which the first substrate 500, the second substrate 600, and the third substrate 700 that constitute the lens control unit 104 are bonded together. Figures 5A and 5B show views from different viewpoints.

[0033] The first substrate 500 has a main plane that is approximately perpendicular to the optical axis O. The second substrate 600 has a main plane that is approximately parallel to the optical axis O. The third substrate 700 has a main plane that is approximately parallel to the optical axis O. Here, "approximately perpendicular" or "approximately parallel" is not limited to a configuration in which each substrate is strictly perpendicular or parallel to the optical axis O, but also means a configuration that can be evaluated as being substantially perpendicular or parallel.

[0034] Reference numeral 501 denotes a first joining portion that joins the first substrate 500 and the second substrate 600 by solder. Reference numeral 502 denotes a second joining portion that joins the first substrate 500 and the third substrate 700 by solder. Reference numeral 503 denotes a first connector that is a connection portion with a flexible printed circuit board (not shown). The flexible printed circuit board will be described later. Reference numeral 504 denotes a second connector that is a connection portion with the flexible printed circuit board. Reference numeral 505 denotes a microcomputer, which is an electrical element.

[0035] Reference numeral 506 denotes a first substrate inner diameter, which is the inner diameter of the first substrate 500. Reference numeral 507 denotes a first substrate outer diameter, which is the outer diameter of the first substrate 500. Reference numeral 508 denotes a first substrate width, which corresponds to the difference (inner / outer diameter difference) between the outer diameter (first substrate outer diameter 507) and inner diameter (first substrate inner diameter 506) of the first substrate 500, which have the same center. Reference numeral 509 denotes a first screw hole for fixing the first substrate 500 to the inside of the interchangeable lens 101. Reference numeral 510 denotes a second screw hole for fixing the first substrate 500 to the inside of the interchangeable lens 101.

[0036] Reference numeral 601 denotes an anti-vibration driving IC (Integrated Circuit) that controls the anti-vibration driving unit 402 shown in FIG. 2. The anti-vibration driving IC 601 is an electric element. Reference numeral 602 denotes a second substrate width corresponding to the contact length between the second substrate 600 and the first substrate 500. Reference numeral 701 denotes a focus driving IC that controls the focus driving unit 302 shown in FIG. 2. The focus driving IC 701 is an electric element. Reference numeral 702 denotes a third substrate width corresponding to the contact length between the third substrate 700 and the first substrate 500.

[0037] The first connector 503, the second connector 504, and the microcomputer 505 are mounted on the main plane of the first substrate 500. The first substrate inner diameter 506 and the first substrate outer diameter 507 have the same center (optical axis O). The first substrate 500 is arc-shaped, and the substrate center is on the optical axis O of the lens, which is an optical element. An anti-vibration driving IC 601 is mounted on the second substrate 600. A focus driving IC 701 is mounted on the third substrate 700. The first substrate width 508 is smaller than both the second substrate width 602 and the third substrate width 702.

[0038] The width of each substrate needs to be wider than one side of the IC, which is the electrical element to be mounted. Therefore, by mounting a large electrical element on the second substrate 600 or the third substrate 700, it is possible to narrow the first substrate width 508. As a result, it is possible to reduce the first substrate outer diameter 507. Furthermore, solder-joining the first substrate 500 and the second substrate 600 can reduce the space occupied by the connector required to mount the connector compared to connector jointing. As a result, it is possible to achieve a smaller interchangeable lens 101.

[0039] Fig. 6(a) is a rear view of the interchangeable lens 101 with the first substrate 500 exposed. Fig. 6(b) is a cross-sectional view taken along line A-A in Fig. 6(a). 800 is a first flexible printed circuit board that is electrically connected to the vibration isolation drive unit 402 shown in Fig. 2. 801 is a first fixed portion where the first flexible printed circuit board 800 is fixed to the linear guide barrel 107. 802 is a first moving portion that moves in accordance with the movement of the image pickup surface side zoom group 110b. 803 is a first bent portion of the first flexible printed circuit board 800.

[0040] 2. Reference numeral 901 denotes a second fixed portion where the second flexible printed circuit board 900 is fixed to the linear guide barrel 107. Reference numeral 902 denotes a second moving portion that moves in accordance with the movement of the zoom group 110b. Reference numeral 903 denotes a second bent portion of the second flexible printed circuit board 900.

[0041] Reference numeral 1000 denotes a first substrate fixing screw that fixes the first substrate 500 to the fixed barrel 109. The first flexible printed circuit board 800 is electrically connected to the first substrate 500 by a first connector 503. A control signal from the lens control unit 104 is output to the vibration isolation drive unit 402 via the first flexible printed circuit board 800. The second flexible printed circuit board 900 is electrically connected to the first substrate 500 by a second connector 504. A control signal from the lens control unit 104 is output to the focus drive unit 302 via the second flexible printed circuit board 900.

[0042] The second substrate 600 is disposed more inward than the first fixed portion 801 with respect to the optical axis O. Furthermore, the second substrate 600, the first fixed portion 801, and the first moving portion 802 are disposed substantially parallel to one another. This allows the second substrate 600 to be disposed in a gap formed by the first fixed portion 801, the first bending portion 803, and the first moving portion 802, which will be described later. This enables a space-efficient substrate arrangement, and enables the interchangeable lens 101 to be made smaller.

[0043] The third substrate 700 is disposed more inward than the second fixed portion 901 with respect to the optical axis O. Furthermore, the third substrate 700, the second fixed portion 901, and the second moving portion 902 are disposed substantially parallel to one another. This allows the third substrate 700 to be disposed in a gap formed by the second fixed portion 901, the second bending portion 903, and the second moving portion 902, which will be described later. This enables a space-efficient substrate arrangement, and enables the interchangeable lens 101 to be made smaller.

[0044] 6( a) and 6(b), the first substrate 500 is disposed in the dead space on the periphery of the lens (optical element) or the lens holding barrel (optical element holding barrel). This allows each substrate to be disposed in the barrel with good spatial efficiency, making it possible to achieve a compact interchangeable lens 101. Furthermore, as shown in FIG. 5(b), the compactness of the interchangeable lens 101 can also be achieved by reducing the outer diameter 507 of the first substrate.

[0045] 7 is a perspective view of the first substrate 500, the imager side zoom group 110b, and the linear guide barrel 107. As shown in Fig. 7, the first flexible printed circuit board 800 connected to the first substrate 500 is disposed inside the linear guide barrel 107, and is connected to the vibration isolation drive unit 402 via the imager side zoom group 110b. As shown in Fig. 7, the second flexible printed circuit board 900 connected to the first substrate 500 is disposed inside the linear guide barrel 107, and is connected to the focus drive unit 302 via the imager side zoom group 110b.

[0046] 8(a) to 8(c) are detailed views of the fixing portion of the linear guide barrel 107 and the flexible printed circuit board (second flexible printed circuit board 900). FIG. 8(a) shows a perspective view of the second flexible printed circuit board 900, the linear guide barrel 107, the first board 500, and the third board 700 as viewed from inside the linear guide barrel 107. FIG. 8(b) shows a perspective view of the fixing portion of the second flexible printed circuit board 900 and the linear guide barrel 107 as viewed from inside the linear guide barrel 107. FIG. 8(c) shows a perspective view of the second flexible printed circuit board 900, the first board 500, and the third board 700 as viewed from inside the linear guide barrel 107.

[0047] Reference numeral 901a denotes an engaging portion of the second flexible printed circuit board 900 with the linear guide barrel 107. Reference numeral 902a denotes an engaging portion of the second flexible printed circuit board 900 with the zoom group 110. Reference numeral 107a denotes an engaging portion of the linear guide barrel 107. As shown in FIGS. 8A to 8C , the engaging portion 901a of the second flexible printed circuit board 900 and the engaging portion 107a of the linear guide barrel 107 engage with each other, and the second fixed portion 901 is fixed to the linear guide barrel 107. As shown in FIG. 8C , the second bent portion 903 is formed by folding back the extending portion of the second fixed portion 901 and extending it to the second moving portion 902. The first flexible printed circuit board 800 is configured similarly to the second flexible printed circuit board 900.

[0048] 9A and 9B are perspective views of the first substrate 500, the zoom group 110, and flexible printed circuit boards (first flexible printed circuit board 800 and second flexible printed circuit board 900). Fig. 9A is a diagram showing the retracted state of the image plane side zoom group 110b. Fig. 9B is a diagram showing the extended state of the image plane side zoom group 110b.

[0049] 9(a) and 9(b), a description will be given of the gap formed by the second fixed portion 901, the second bent portion 903, and the second movable portion 902. Reference numeral 904 denotes an excess portion formed between the engaging portion 902a of the second flexible printed circuit board 900 and the second bent portion 903. Reference numeral 804 denotes an excess portion of the first flexible printed circuit board 800 formed in the same configuration as the excess portion 904.

[0050] 9A and 9B, the positions of the extra length portions 804 and 904 move. As a result, even if the image plane side zoom group 110b moves, the first fixed portion 801 and the second fixed portion 901 do not expand or contract. As a result, failures due to breakage of the first fixed portion 801 and the second fixed portion 901 can be avoided.

[0051] On the other hand, the first bent portion 803 and the second bent portion 903 are necessary for the movement of the excess length portions 804, 904. Therefore, a space is required in the radial direction of the interchangeable lens 101 for arranging the first flexible printed circuit board 800 and the second flexible printed circuit board 900. Furthermore, the first flexible printed circuit board 800 and the second flexible printed circuit board 900 extend in the optical axis direction so that they can follow the image pickup surface side zoom group 110b, which moves in the optical axis direction. In this embodiment, the second substrate 600 and the third substrate 700 are disposed in the gap formed by the second fixed portion 901, the second bent portion 903, and the second moving portion 902. At this time, the second substrate 600 is not in contact with the first moving portion 802, and the third substrate 700 is not in contact with the second moving portion 902. This configuration enables a space-efficient substrate arrangement, thereby achieving a compact interchangeable lens 101.

[0052] FIG. 10(a) is a rear view of the first substrate 500, the first flexible printed circuit board 800, and the second flexible printed circuit board 900. FIG. 10(b) is a cross-sectional view taken along line B-B in FIG. 10(a). FIG. 11(a) is a side view of the first substrate 500, the second substrate 600, the third substrate 700, the first flexible printed circuit board 800, and the second flexible printed circuit board 900. FIG. 11(b) is a cross-sectional view taken along line C-C in FIG. 11(a). For ease of explanation, FIGS. 10(a), (b) and 11(a), (b) will be used together for explanation.

[0053] 10( a) and 10(b) and 11(a) and 11(b) , when viewed from the optical axis direction (on a projection plane perpendicular to the optical axis O), the second substrate 600 is disposed more inward (closer to the optical axis O) than the first fixed portion 801 with respect to the optical axis O. When viewed from the optical axis direction, the second substrate 600 is disposed so as to overlap with the first bent portion 803. When viewed from the optical axis direction, the second substrate 600 is disposed so as to overlap with the first movable portion 802. This allows the second substrate 600 to be disposed in a space formed by the first fixed portion 801, the first bent portion 803, and the first movable portion 802. As a result, the second substrate 600 can be disposed with high spatial efficiency.

[0054] As shown in FIGS. 10( a) and 10(b) and 11(a) and 11(b), when viewed from the optical axis direction (on a projection plane perpendicular to the optical axis O), the third substrate 700 is disposed inward (closer to the optical axis O) with respect to the optical axis O than the second fixed portion 901. When viewed from the optical axis direction, the third substrate 700 is disposed so as to overlap with the second bent portion 903. When viewed from the optical axis direction, the third substrate 700 is disposed outward (farther from the optical axis O than the second movable portion 902) with respect to the optical axis O. This allows the third substrate 700 to be disposed in a space formed by the second fixed portion 901, the second bent portion 903, and the second movable portion 902. As a result, the third substrate 700 can be disposed with high spatial efficiency.

[0055] With this configuration, even if the first substrate width 508 is reduced, it is possible to mount electrical elements such as ICs by utilizing the gap to position the second substrate 600 and the third substrate 700. Therefore, the first substrate width 508 can be reduced, thereby realizing a more compact interchangeable lens 101.

[0056] 10(a) and 10(b) and 11(a) and 11(b), when viewed from the optical axis direction, the anti-vibration driving IC 601 is not disposed between the second substrate 600 and the first moving section 802. For example, the anti-vibration driving IC 601 is disposed between the second substrate 600 and the first fixed section 801. This makes it possible to reduce the clearance with peripheral components in the event of a drop or impact, compared to when the anti-vibration driving IC 601 is disposed between the second substrate 600 and the first moving section 802. This improves space efficiency and makes it possible to reduce the size of the interchangeable lens 101.

[0057] In each embodiment, for example, the lens control unit 104 may be configured with the first substrate 500 and the second substrate 600 without using the third substrate 700. Furthermore, in each embodiment, the first substrate width 508 may be larger than the second substrate width 602 or the third substrate width 702. Furthermore, in each embodiment, the first flexible printed circuit board 800 or the second flexible printed circuit board 900 may be connected to a fixed lens group whose position in the optical axis direction is fixed. Furthermore, in each embodiment, the first substrate 500 does not have a perfect arc shape, and a portion of the first substrate inner diameter 506 or the first substrate outer diameter 507 may have an irregular shape, such as a straight line.

[0058] As described above, the optical device of this embodiment realizes a space-efficient arrangement and layout of the substrates, making it possible to provide a compact optical device.

[0059] 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 changes are possible within the scope of the gist of the present invention.

[0060] In this embodiment, two substrates (second substrate 600 and third substrate 700) parallel to the optical axis are bonded to the first substrate 500, but this is not limiting. For example, only one substrate or three or more substrates may be bonded to the first substrate 500. Furthermore, the second substrate 600 and the third substrate 700 may be interchangeable, and at least one of the two substrates may be referred to as the second substrate.

Claims

1. An optical device comprising: a first substrate having a main plane perpendicular to an optical axis; a second substrate having a main plane parallel to the optical axis; and a flexible printed circuit board, wherein the first substrate and the second substrate are bonded to each other; and when viewed from the optical axis direction, the second substrate overlaps with the flexible printed circuit board.

2. The optical device according to claim 1, further comprising a lens group that moves in the optical axis direction, and the flexible printed circuit board is electrically connected to the lens group.

3. The optical device according to claim 1 or 2, wherein the flexible printed circuit board has a fixed portion, a moving portion and a bending portion.

4. The optical device according to claim 3, characterized in that, when viewed from the optical axis direction, the second substrate is disposed at a position closer to the optical axis than the fixed portion.

5. The optical device according to claim 3 or 4, characterized in that, when viewed from the optical axis direction, the second substrate overlaps with the bent portion.

6. An optical device according to any one of claims 3 to 5, characterized in that, when viewed from the optical axis direction, the second substrate overlaps with the moving portion.

7. An optical device as claimed in any one of claims 3 to 5, characterized in that, when viewed from the optical axis direction, the second substrate is positioned farther from the optical axis than the moving portion.

8. An optical device according to any one of claims 3 to 7, characterized in that the second substrate is not in contact with the moving portion.

9. An optical device as claimed in any one of claims 1 to 8, characterized in that the first substrate has a first substrate width corresponding to the difference between an outer diameter and an inner diameter having the same center, the second substrate has a second substrate width corresponding to a contact length with the first substrate, and the first substrate width is smaller than the second substrate width.

10. An optical device according to any one of claims 1 to 9, characterized in that an electric element is mounted on the second substrate.

11. An optical device as claimed in any one of claims 1 to 10, characterized in that, when viewed from the optical axis direction, the first substrate is arranged on the outer periphery of an optical element or an optical element holding barrel.

12. The optical device according to claim 10, characterized in that, when viewed from the optical axis direction, the electrical element is not disposed between the second substrate and the moving portion of the flexible printed circuit board.

13. The optical device according to any one of claims 1 to 12, wherein the first substrate and the second substrate are joined to each other by soldering.

14. An optical instrument according to any one of claims 1 to 13, characterized in that the optical instrument is a lens arrangement.

15. The optical device according to any one of claims 1 to 13, characterized in that the optical device is an imaging device.

Images