CN109307969B - Optical unit with shake correction function - Google Patents
Optical unit with shake correction function Download PDFInfo
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- CN109307969B CN109307969B CN201810817070.4A CN201810817070A CN109307969B CN 109307969 B CN109307969 B CN 109307969B CN 201810817070 A CN201810817070 A CN 201810817070A CN 109307969 B CN109307969 B CN 109307969B
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- holder
- barrel member
- optical unit
- sensor cover
- movable body
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- 230000003287 optical effect Effects 0.000 title claims abstract description 100
- 230000007246 mechanism Effects 0.000 claims description 34
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 238000003384 imaging method Methods 0.000 description 10
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000000696 magnetic material Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
- H04N23/682—Vibration or motion blur correction
- H04N23/685—Vibration or motion blur correction performed by mechanical compensation
- H04N23/687—Vibration or motion blur correction performed by mechanical compensation by shifting the lens or sensor position
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Adjustment Of Camera Lenses (AREA)
- Studio Devices (AREA)
Abstract
The invention provides an optical unit with a shake correction function, which eliminates the duplication of parts and function and improves the performance. A movable body (16) is supported by a support body (17) so as to be freely swingable and is housed in the fixed body (15). A lens (18) is exposed at an opening of the subject side housing (13). The lens (18) is held by a barrel member (19) included in the movable body (16). A cylindrical portion (40c) of a holder (40) constituting the movable body (16) has a shape surrounding the outer periphery of the lens barrel member (19). A male screw is formed on the outer periphery of the barrel member (19), and a female screw fitted into the male screw of the barrel member (19) is formed on the inner periphery of the cylindrical portion (40 c). The mounting of the lens barrel member (19) to the holder (40) is performed by fitting the external thread with the internal thread, and the lens barrel member (19) is directly fixed to the holder (40).
Description
Technical Field
The present invention relates to an optical unit with a shake correction function mounted on a mobile terminal or a mobile body.
Background
As an optical unit with a shake correction function of this type, there is an optical unit disclosed in patent document 1, for example. The optical unit includes a movable body including an optical element, and a support body that swingably supports the movable body by a swing support mechanism. The support is configured as a fixed body with respect to the movable body, and houses the movable body while exposing a lens as an optical element to the subject side. The movable body includes an optical module and a holder holding the optical module from an outer circumferential side, and is generally shown in an exploded perspective view of fig. 1.
The optical module is configured by holding a lens barrel member 1 holding an optical element and a circuit board 3 enclosing an image pickup element 2 shown in fig. 1 on a sensor cover (sensor cover) 4. The lens barrel member 1 is attached to the sensor cover 4 by fitting an outer periphery thereof into an inner periphery of a cylindrical portion 4a formed in the center of the sensor cover 4 by a screw. Inside the cylindrical portion 4a, a rectangular opening 4b is formed through which subject light incident via the optical element enters the image pickup element 2. The holder 5 includes a cylindrical holding portion 5b formed at the center of the bottom plate portion 5a, and wall portions 5c erected on four sides of the bottom plate portion 5 a. The optical module is fixed to the holder 5 by holding the outer periphery of the cylindrical portion 4a of the sensor cover 4 to the inner periphery of the holding portion 5b of the holder 5.
On each wall portion 5c of the holder 5, a not-shown coil for swing driving is attached, and on each inner wall of the fixed body facing each coil for swing driving, a magnet for swing driving is attached. These swing driving coils and the swing driving magnets constitute a swing driving mechanism, and the movable body is swung by energizing the swing driving coils, thereby performing shake correction in the pitch (pitching) direction and the roll (rolling) direction.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent laid-open No. 2015-82072
Disclosure of Invention
[ problems to be solved by the invention ]
However, the conventional optical unit with the shake correction function is configured to be a movable body by assembling the optical module to a separately designed actuator (actuator) having the holder. Therefore, the technical study of the component structure of the conventional optical unit with the shake correction function as viewed from the entire movable body is not sufficient, and a technical problem of finding out an optical unit with improved performance remains.
[ means for solving problems ]
The present invention is an optical unit with a shake correction function, which is developed to solve the above-described problems, and includes: a movable body including a lens barrel member that holds an optical element, an image pickup element that receives subject light imaged by the optical element, and a holder that is provided so as to surround an outer periphery of the lens barrel member and to which one of a coil or a magnet constituting a swing drive mechanism is attached; and a fixed body for supporting the movable body via a swing support mechanism in a freely swinging manner and mounting the other of the coil and the magnet which form the swing drive mechanism; in the optical unit with shake correction function, the lens barrel member is directly fixed to the holder.
Previously, the following technical problems have been found: the lens barrel member is repeatedly held on the movable body by fixing the sensor cover to the holder after being mounted on the sensor cover. The present invention has been made to solve the above-described technical problems, and has a structure in which a lens barrel member is directly fixed to a holder without a sensor cover. According to the present configuration, a sensor cover member interposed between the lens barrel member and the holder is not required, and thus, repetition of parts and repetition of functions are eliminated, and performance of the optical unit can be improved. That is, the material cost is reduced to the extent of an unnecessary member, so that the product cost of the optical unit can be reduced. Further, by filling the space around the barrel member where the extra member exists, the movable body, and even the optical unit, can be made smaller and lighter. The weight reduction of the movable body can reduce the power required for the swing drive mechanism, and the power consumption of the optical unit can be reduced. Further, by utilizing the space around the barrel member where the extra member once exists, it is possible to provide a large barrel member in the movable body, and it is possible to realize high pixelation of an image that can be obtained in the optical unit without changing the outer dimension.
Further, the holder of the present invention has a cylindrical portion surrounding the outer periphery of the lens barrel member, and the outer periphery of the lens barrel member is directly fixed to the inner periphery of the cylindrical portion.
According to the present configuration, an unnecessary member can be reduced in the radial direction of the lens barrel member, and a space can be filled or secured in the radial direction of the lens barrel member. Further, the cylindrical member of the outer periphery of the barrel member and the cylindrical member of the inner periphery of the cylinder portion of the holder are fitted and fixed to each other, whereby the barrel member can be reliably and stably held by the holder.
In the present invention, a male screw is formed on the outer periphery of the barrel member, and a female screw fitted into the male screw is formed on the inner periphery of the cylindrical portion of the holder.
According to the present configuration, the lens barrel member has a variable relative position with respect to the holder by the screw action of the external thread and the internal thread. Therefore, the optical element held by the barrel member advances and retreats relative to the holder in accordance with the pitch of the screw, and the distance from the imaging element is adjusted. Therefore, the distance between the optical element and the image pickup element can be adjusted with improved resolution, and the focus adjustment can be performed with high accuracy. Further, the outer periphery of the lens barrel member and the inner periphery of the holder are screwed to hold the lens barrel member on the holder, so that the contact area between the lens barrel member and the holder is increased, and thus the fixation between the lens barrel member and the holder can be made firm.
In addition, conventionally, a lens barrel member is assembled to a sensor cover on which an image pickup device is mounted, thereby constituting an existing optical module. Therefore, if the specification of the lens barrel member is changed, the specification of the male screw formed on the outer periphery of the lens barrel member is changed, and therefore, the sensor cover and the image pickup device, which are integrally assembled to the lens barrel member and in which the female screw matching the specification of the male screw of the lens barrel member is formed, must also be changed together with the lens barrel member. However, according to the present configuration, since the movable body is not configured using an existing optical module using a sensor cover, the specification of the lens barrel member can be changed by changing the specification of the female screw formed in the holder in accordance with the specification of the new male screw of the lens barrel member.
The sensor cover of the present invention is fixed to the holder on the side opposite to the object and integrally provided on the holder, and includes an opening through which the object light is incident on the image pickup device and a covering portion formed around the opening and covering the image pickup device.
According to the present configuration, since the portion of the image pickup element other than the portion on which the subject light is incident is covered with the covering portion of the sensor cover, the excessive light does not enter the image pickup element as stray light.
The holder of the present invention is provided with a sensor cover as a member integrated with the holder on the side of the opposite object, the sensor cover including an opening through which the object light is incident on the imaging element and a covering portion formed around the opening to cover the imaging element.
According to the present configuration, since the image pickup element portion other than the portion on which the subject light is incident is also covered by the covering portion of the sensor cover, the excessive light does not enter the image pickup element as stray light. Further, since the sensor cover is formed as a member integrated with the holder, the number of components does not increase, and thus the product cost of the optical unit can be reduced.
In the sensor cover of the present invention, the cover portion has a boss formed on a surface thereof facing the holder, and the holder has a hole or a recess formed in a surface thereof facing the cover portion, into which the boss is fitted.
According to this configuration, the boss formed in the covering portion of the sensor cover is fitted into the hole or the recess formed in the holder, and the sensor cover is fixed to the holder, whereby the optical element held by the holder and the image pickup element held by the sensor cover can be easily positioned relative to each other.
The sensor cover of the present invention has a cylindrical portion that surrounds the opening and is vertically provided on the holder side and fitted to the holder.
According to this configuration, the cylindrical portion standing on the holder side of the sensor cover is fitted to the holder, and the sensor cover is fixed to the holder, whereby the optical element held by the holder and the imaging element held by the sensor cover can be easily positioned relative to each other.
In the present invention, the sensor cover is fixed to the holder by an adhesive.
According to the present configuration, after the relative positioning of the lens barrel member and the holder is performed, the sensor cover and the holder can be fixed to each other with an adhesive. Further, when the lens barrel member and the holder are screwed to each other, the adhesive enters the gap of the fitting portion of the lens barrel member and the holder to fill the gap and fix the lens barrel member and the holder to each other, thereby preventing rattling.
In the swing drive mechanism of the present invention, the coil is attached to the holder, and the magnet is attached to the holder.
According to the present configuration, by mounting the coil constituting the swing driving mechanism on the holder, the weight of the movable body can be reduced as compared with the case where the magnet constituting the swing driving mechanism is mounted on the holder. Therefore, the driving power required for the swing driving mechanism is reduced, so that the power consumption of the optical unit can be reduced. Further, by attaching a magnet constituting the swing drive mechanism to the fixed body and forming the fixed body with a magnetic material such as metal, the fixed body can be used as a yoke (yoke). Therefore, it is not necessary to form the holder using a magnetic material such as metal as a yoke, and the holder may be formed using resin. Therefore, the holder can be made lightweight while reducing the driving power required for the swing driving mechanism, and the female screw can be easily formed on the holder.
[ Effect of the invention ]
According to the optical unit with shake correction function of the present invention, a sensor cover member interposed between the barrel member and the holder is not required, and thus repetition of parts and repetition of functions are eliminated, and the performance of the optical unit can be improved.
Drawings
Fig. 1 is an exploded perspective view of a movable body supported by a support body in a conventional optical unit with a shake correction function.
Fig. 2 is an external perspective view of an optical unit with a shake correction function according to an embodiment of the present invention.
Fig. 3 is an exploded perspective view of an optical unit with a shake correction function according to an embodiment.
Fig. 4 is an external perspective view of a support body that supports a movable body in an optical unit with a shake correction function according to an embodiment.
Fig. 5 is an exploded perspective view of the optical unit with shake correction function according to the embodiment in which the movable body is separated from the support body.
Fig. 6 is an exploded perspective view of a movable body in the optical unit with shake correction function according to the embodiment.
Fig. 7 is an exploded perspective view schematically showing a movable body of each member shown in fig. 6.
Fig. 8(a) is a plan view schematically showing a movable body of each member shown in fig. 6, and fig. 8(b) is a sectional view.
Description of the symbols
1. 19: lens barrel member
2. 41: image pickup device
3. 43: circuit board
4. 42: sensor cover
4 a: cylindrical part
4b, 42 a: opening part
5. 40: holding device
5a, 40 a: floor part
5 b: holding part
5c, 40 b: wall part
11: optical unit (optical unit) with shake correction function
12: cylindrical case
13: object side housing
13 a: annular groove
14: anti-object side housing
15: fixing body
16: movable body
17: support body
17 a: body member
17a 1: circular ring part
17a 2: longitudinal frame part
17a 3: main body part
18: lens (optical element)
20: retainer
21. 45, and (2) 45: plate spring
22: ball bearing
23: coil for tumble drive
30: coil for swing drive
31: magnet for swing drive
32a, 32b, 33: flexible printed circuit board 40 c: barrel part
40 d: hole(s)
42 b: covering part
42 c: boss
44: screw nail
L: optical axis
R1: 1 st axis
R2: 2 nd axis
+ X: one side in the X-axis direction
-X: the other side in the X-axis direction
+ Y: one side in the Y-axis direction
-Y: the other side in the Y-axis direction
+ Z: one side in the Z-axis direction
-Z: the other side in the Z-axis direction
Detailed Description
Next, a description will be given of an embodiment of an optical unit with a shake correction function for carrying out the present invention.
(integral constitution)
Fig. 2 is an external perspective view of the optical unit 11 with shake correction function according to the embodiment of the present invention, and fig. 3 is an exploded perspective view.
In this specification, the 3 axes of XYZ are directions orthogonal to each other, one side in the X axis direction is represented by + X, the other side in the X axis direction is represented by-X, one side in the Y axis direction is represented by + Y, the other side in the Y axis direction is represented by-Y, one side in the Z axis direction is represented by + Z, and the other side in the Z axis direction is represented by-Z. The Z-axis direction is a direction along the optical axis L of an optical element mounted on the movable body 16 in a state where the movable body 16 of the optical unit 11, which will be described later, is not swung. The + Z direction is an object side (object side) in the direction of the optical axis L, and the-Z direction is an image side (opposite object side) in the direction of the optical axis L.
The optical unit 11 includes a fixed body 15 including a cylindrical housing 12, an object side housing 13, and an opposite object side housing 14. The cylindrical case 12 has a substantially octagonal outer shape and is formed of a magnetic material. The object side housing 13 is assembled from the + Z direction side (object side) with respect to the cylindrical housing 12, and the reverse object side housing 14 is assembled from the-Z direction side (reverse object side) with respect to the cylindrical housing 12. The object side housing 13 and the counter object side housing 14 are formed of a resin material.
The movable body 16 is supported and housed by a support 17 inside the fixed body 15. The lens 18 is exposed at an opening of the subject side housing 13. The lens 18 is held by a barrel member 19 included in the movable body 16.
(rotation support mechanism and Rolling drive mechanism)
The support 17 presses the end surface of the object side to the object side housing 13 side by a plate spring 21 via an annular retainer (retainer)20, and the annular retainer 20 holds a plurality of balls, not shown, in parallel in the circumferential direction. Thus, the spherical body held by the holder 20 is sandwiched between the annular groove 13a of the object side housing 13 and an annular groove, not shown, provided on the object side end face of the support 17, and the support 17 causes the object side end face to slide on the end face of the object side housing 13 via the plurality of spherical bodies. The plate spring 21 has both ends in its longitudinal direction fixed to the bottom of the anti-object side housing 14. The support body 17 includes a ball bearing 22 on the anti-object side, and the ball bearing 22 is fixed to the bottom of the anti-object side housing 14 via a plate spring 21. The holder 20 and the ball bearing 22 constitute a rotation support mechanism that supports the support body 17 rotatably around the Z axis.
A tumble driving coil 23 is provided on the opposite object side of the support 17, and a tumble driving magnet, not shown, is provided on the + Z side of the leaf spring 21 on the opposite object side housing 14, opposite the tumble driving coil 23. The tumble driving coil 23 and the tumble driving magnet constitute a tumble driving mechanism.
(swing supporting mechanism and swing driving mechanism)
Further, a gimbal mechanism (not shown) is provided as a swing support mechanism between the movable body 16 and the support body 17, the gimbal mechanism supporting the movable body 16 on the support body 17 so as to be swingable around a1 st axis line R1 and around a2 nd axis line R2, the 1 st axis line R1 and the 2 nd axis line R2 being orthogonal to the Z-axis direction and being inclined at 45 degrees with respect to the X-axis direction and the Y-axis direction. The swing support mechanism includes: two 1 st swing support portions provided at diagonal positions on the 1 st axis R1 on the outer periphery of the movable body 16; two 2 nd swing support portions provided at diagonal positions on the 2 nd axis R2 on the inner periphery of the support body 17; and a movable frame, not shown, supported by the 1 st and 2 nd rocking support portions, surrounding the outer periphery of the movable body 16. Balls are fixed at four positions around the movable frame, and the balls are in point contact with contact springs respectively held on the 1 st rocking support portion and the 2 nd rocking support portion. The contact spring supported by the 1 st swing support portion is elastically deformable in the 1 st axis R1 direction, and the contact spring supported by the 2 nd swing support portion is elastically deformable in the 2 nd axis R2 direction. Therefore, the movable frame is supported in a rotatable state about the 1 st axis R1 and about the 2 nd axis R2.
The swing drive coils 30 are attached to both sides of the movable body 16 in the X-axis direction and both sides of the movable body in the Y-axis direction, respectively. Swing drive magnets 31 are attached to the opposite inner walls of the tubular case 12 in the X-axis direction and the opposite inner walls in the Y-axis direction, respectively, so as to oppose the respective swing drive coils 30. The coil 30 for swing drive and the magnet 31 for swing drive constitute a swing drive mechanism. The swing driving magnet 31 may be mounted on the support 17, which is a fixed body, with respect to the movable body 16, instead of being mounted on the cylindrical case 12.
(correction of shaking)
The optical unit 11 includes a flexible printed circuit board 32a, a flexible printed circuit board 32b, and a flexible printed circuit board 33.
The flexible printed circuit board 32a is electrically connected to each tumble drive coil 23, and the flexible printed circuit board 32b is electrically connected to each swing drive coil 30. The flexible printed circuit board 33 is electrically connected to a circuit board 43, which will be described later, held by the movable body 16. Note that the flexible printed circuit board 32a, the flexible printed circuit board 32b, and the flexible printed circuit board 33 are illustrated only in fig. 1, and are omitted in other drawings.
When a current is applied to each of the tumble drive coils 23 through the flexible printed circuit board 32a, a magnetic driving force in the tumble direction is generated between each of the tumble drive coils 23 and each of the tumble drive magnets. The subject image captured by the camera module is an image blur in the roll direction around the Z axis detected by a gyroscope (gyroscope) included in the movable body 16, which is obtained by rotating the support body 17 around the Z axis with respect to the fixed body 15 by the magnetic driving force in the roll direction. When a current is applied to each of the swing driving coils 30 through the flexible printed circuit board 32b, a magnetic driving force is generated between each of the swing driving coils 30 and each of the swing driving magnets 31. The subject image captured by the camera module is made to swing relative to the support 17 about the 1 st axis R1 and about the 2 nd axis R2 by these magnetic driving forces, thereby correcting image shake in the pitch direction around the X axis and the yaw (yaw) direction around the Y axis detected by the gyroscope included in the movable body 16.
(constitution of support body and Movable body)
Fig. 4 is an external perspective view of the movable body 16 supported on the support 17 when viewed from the opposite side to the subject. Fig. 5 is an exploded perspective view of the support body 17 and the movable body 16 separated from each other when viewed from the opposite object side. In these figures, the circuit board 43 provided on the side of the movable body 16 opposite to the object is not shown.
The support 17 includes a main body member 17a positioned on the outer peripheral side of the movable body 16, and a not-shown floor member fixed to the main body member 17a from the opposite object side so as to face the movable body 16. The body member 17a and the bottom plate member are made of resin. The body member 17a includes a circular ring portion 17a1 sandwiching the holder 20 with the object side housing 13, a vertical frame portion 17a2 extending from four places of the circular ring portion 17a1 to the opposite object side, and a body portion 17a3 coupled to each vertical frame portion 17a2 on the opposite object side. A window portion is formed between the adjacent vertical frame portions 17a 2.
The movable body 16 is shown in an exploded perspective view from the side opposite to the object in fig. 6, and includes a barrel member 19 that holds the lens 18 as an optical element, a holder 40 to which the coil 30 for swing driving is attached, an image pickup device 41 that is packaged on a circuit board 43 described later, and a sensor cover 42 that covers the image pickup device 41. The image pickup device 41 receives the subject light formed by the lens 18 and outputs an electric signal of the subject light formed on the circuit board 43 of the package.
Fig. 7 is an exploded perspective view schematically showing each member constituting the movable body 16, and the movable body 16 is viewed from the object side. Fig. 8(a) is a plan view schematically showing the movable body 16 constituting the member, and fig. 8(b) is a sectional view taken along line b-b of fig. 8 (a). In fig. 7 and fig. 8(a) and 8(b), the same reference numerals are given to the same parts as those in fig. 6. As shown in fig. 7, 8(a) and 8(b), the image pickup device 41 is mounted on a circuit board 43. The sensor cover 42 includes an opening 42a through which subject light enters the image pickup device 41, and a covering portion 42b formed around the opening 42a to cover the image pickup device 41. The cover 42b has a rectangular cylindrical shape, and a circuit board 43 in which the image pickup device 41 is mounted is fixed to an opposite object-side end face of the cover 42b by three screws 44 (see fig. 5), and the component mounting face is covered with the cover 42 b.
The holder 40 includes: a bottom plate portion 40a which surrounds the outer periphery of the lens barrel member 19, is made of resin, and has a substantially octagonal shape when viewed in the Z-axis direction; four wall portions 40b erected on both sides of the bottom plate portion 40a in the X-axis direction and the Y-axis direction, respectively, in the + Z direction; and a cylindrical portion 40c centered on the Z-axis at the center of the bottom plate portion 40 a. The swing driving coils 30 are attached to the wall portions 40b at four locations as shown in fig. 5, and the swing driving coils 30 are exposed to the window portions formed between the vertical frame portions 17a2 of the support 17 as shown in fig. 4.
A plate spring 45 shown in fig. 5 is bridged between the object-side annular end surface of the cylindrical portion 40c and the opposite object-side annular end surface of the annular portion 17a1 of the support 17. The plate spring 45 defines a reference posture of the movable body 16 with respect to the support body 17. That is, when the swing driving coil 30 is not driven, the posture of the movable body 16 is maintained in the reference posture in which the optical axis L (see fig. 2) of the lens 18 held by the movable body 16 coincides with the Z axis by the leaf spring 45.
The sensor cover 42 is made of resin similarly to the holder 40, and is fixed to the holder 40 on the side opposite to the subject as shown in fig. 8(a) and 8(b), and is integrally provided on the holder 40. The sensor cover 42 is fixed to the holder 40 by an adhesive in the present embodiment. As shown in fig. 7, the sensor cover 42 has a pair of bosses 42c formed diagonally across an opening 42a on a surface of the cover portion 42b facing the holder 40. The holder 40 has a pair of holes 40d formed in a surface of the bottom plate portion 40a facing the cover portion 42b, into which the bosses 42c are fitted. The pair of holes 40d may be a pair of recesses, not shown, into which the bosses 42c are fitted.
The cylinder 40c of the holder 40 has a shape surrounding the outer periphery of the lens barrel member 19. The barrel member 19 is fixed directly to the holder 40 by fixing the outer periphery to the inner periphery of the cylindrical portion 40 c. In the present embodiment, a male screw is formed on the outer periphery of the barrel member 19, and a female screw fitted into the male screw of the barrel member 19 is formed on the inner periphery of the cylindrical portion 40 c. The mounting of the lens barrel member 19 to the holder 40 is performed by fitting the external thread with the internal thread.
(Effect)
In the conventional optical unit with a shake correction function, the following technical problems have been found: after the lens barrel member 1 shown in fig. 1 is mounted on the sensor cover 4, the sensor cover 4 is fixed to the holder 5, and the sensor cover 4 and the holder 5 are repeatedly held to the movable body in the radial direction on the outer periphery of the lens barrel member 1. In order to solve the above-described technical problem, the optical unit 11 with shake correction function according to the present embodiment is configured such that the lens barrel member 19 is directly fixed to the holder 40 without passing through the sensor cover 42, as shown in fig. 7, 8(a) and 8 (b).
According to the optical unit with shake correction function 11 of the present embodiment as described above, the member of the cylindrical portion 4a of the sensor cover 4 interposed between the barrel member 1 and the holder 5 of the conventional optical unit with shake correction function shown in fig. 1 is not required, and therefore, the repetition of the parts of the cylindrical portion 4a and the holding portion 5b and the repetition of the function of fixing the barrel member 1 and the cylindrical portion 4a and the function of fixing the cylindrical portion 4a and the holding portion 5b are eliminated, and the performance of the optical unit 11 can be improved.
That is, the material cost is reduced by the cylindrical portion 4a corresponding to the extra member, so that the product cost of the optical unit 11 can be reduced. Further, by filling the space where the extra member around the lens barrel member 19 exists, the movable body 16 and the optical unit 11 can be made smaller and lighter. In the present embodiment, the cylindrical portion 4a of the conventional optical unit with the shake correction function is reduced as an extra member in the radial direction of the lens barrel member 19, so that the space can be filled in the radial direction of the lens barrel member 19, and the optical unit 11 can be reduced in size and weight. By reducing the weight of the movable body 16, the power required for the swing drive mechanism including the swing drive coil 30 and the swing drive magnet 31 can be reduced, and the power consumption of the optical unit 11 can be reduced. Further, by utilizing the space that the cylindrical portion 4a exists around the lens barrel member 19 in the radial direction, a space can be secured in the radial direction of the lens barrel member 19, and a large lens barrel member 19 can be provided in the movable body 16. Therefore, high pixelation of an image obtainable in the optical unit 11 can be achieved without changing the outer dimensions. Further, the inner periphery of the cylindrical portion 40c of the holder 40 and the cylindrical member of the outer periphery of the lens barrel member 19 are fitted and fixed to each other, whereby the lens barrel member 19 can be reliably and stably held by the holder 40.
Further, according to the optical unit 11 with shake correction function of the present embodiment, the relative position of the barrel member 19 with respect to the holder 40 can be changed by the screw action of the external screw thread thereof with the internal screw thread of the cylindrical portion 40 c. Therefore, the lens 18 held by the barrel member 19 advances and retracts with respect to the holder 40 in accordance with the pitch of the screw thread, and the distance from the imaging element 41 is adjusted. Therefore, the distance between the lens 18 and the image pickup device 41 can be adjusted with improved resolution, and the focus adjustment can be performed with high accuracy. Further, the outer periphery of the lens barrel member 19 is screwed into the inner periphery of the cylindrical portion 40c of the holder 40 to hold the lens barrel member 19 on the holder 40, so that the contact area between the lens barrel member 19 and the holder 40 is increased, and thus the fixation between the lens barrel member 19 and the holder 40 can be made firm.
In addition, the lens barrel member 1 is previously assembled to the sensor cover 4 on which the imaging element 2 is mounted, together to constitute an existing optical module. Therefore, if the specification of the lens barrel member 1 is changed, the specification of the male screw formed on the outer periphery of the lens barrel member 1 is changed, and therefore the sensor cover 4 and the imaging element 2, which are assembled together to the lens barrel member 1 and have the female screw formed on the cylindrical portion 4a in accordance with the specification of the male screw of the lens barrel member 1, must also be changed together with the lens barrel member 1. However, according to the present embodiment, since the movable body 16 is configured without using an existing optical module using the sensor cover 4, the specification of the lens barrel member 19 can be changed by changing the specification of the female screw formed in the cylindrical portion 40c of the holder 40 in accordance with the specification of the new male screw of the lens barrel member 19. The specification of the female screw formed in the cylindrical portion 40c of the holder 40 can be easily changed by replacing a part (part) of the die for molding the holder 40, which is a female screw portion of the ferrule (mounting), and thus the lens barrel member 19 including various lenses 18 can be easily handled.
Further, according to the optical unit 11 with shake correction function of the present embodiment, since the portion of the image pickup device 41 other than the portion where the subject light enters through the opening 42a is covered by the covering portion 42b of the sensor cover 42, the excessive light does not enter the image pickup device 41 as stray light.
Further, according to the optical unit 11 with shake correction function of the present embodiment, the boss 42c formed on the covering portion 42b of the sensor cover 42 is fitted into the hole 40d or the recess formed on the holder 40, and the sensor cover 42 is fixed to the holder 40, whereby the lens 18 held by the holder 40 and the imaging element 41 held by the sensor cover 42 can be easily positioned relative to each other.
In the optical unit 11 with shake correction function according to the present embodiment, since the sensor cover 42 is fixed to the holder 40 by an adhesive, the sensor cover 42 and the holder 40 can be fixed to each other by an adhesive after the lens barrel member 19 and the holder 40 are positioned relative to each other. In the present embodiment, since the lens barrel member 19 and the holder 40 are screwed into each other, the adhesive enters the gap between the fitting portions of the lens barrel member 19 and the holder 40, and fills the gap to fix the lens barrel member 19 and the holder 40 to each other, thereby preventing rattling.
(modification example)
In the optical unit 11 with shake correction function according to the present embodiment, the coil 30 for swing drive constituting the swing drive mechanism is attached to the holder 40, and the magnet 31 for swing drive is attached to the fixed body 15, but the coil 30 for swing drive may be attached to the fixed body 15, and the magnet 31 for swing drive may be attached to the holder 40. However, according to the optical unit 11 with shake correction function of the present embodiment in which the coil 30 for swing drive is attached to the holder 40 and the magnet 31 for swing drive is attached to the fixed body 15, the coil 30 for swing drive is attached to the holder 40, whereby the weight of the movable body 16 can be reduced as compared with the case where the magnet 31 for swing drive is attached to the holder 40. Therefore, the driving power required for the swing driving mechanism is reduced, so that the power consumption of the optical unit 11 can be reduced. Further, as in the present embodiment, by attaching the swing driving magnet 31 to the fixed body 15 and forming the fixed body 15 with a magnetic material such as metal, the fixed body 15 can be used as a yoke. Therefore, the holder 40 does not need to be formed of a magnetic material such as metal as a yoke, but may be formed of resin. Therefore, the holder 40 can be made lightweight while reducing the driving power required for the swing driving mechanism, and the female screw can be easily formed on the holder 40.
In the optical unit 11 with shake correction function according to the present embodiment, the sensor cover 42 and the holder 40 are configured as separate bodies, and the sensor cover 42 is integrally attached to the holder 40. However, the holder 40 may be configured to include, as a member integrated with the holder 40, a sensor cover, not shown, including an opening 42a through which subject light enters the imaging device 41 and a covering portion 42b formed around the opening 42a and covering the imaging device 41, on the side opposite to the subject. According to the present configuration, since the portion of the image pickup device 41 other than the portion on which the subject light is incident is also covered by the covering portion 42b of the sensor cover portion, the excessive light does not enter the image pickup device 41 as stray light. Further, since the sensor cover is formed as a member integrated with the holder 40, the number of components is not increased, and thus the product cost of the optical unit 11 can be reduced.
In the optical unit 11 with shake correction function according to the present embodiment, a case will be described in which the surface of the sensor cover 42 on which the opening 42a is formed flat. However, the sensor cover 42 may be configured to include a cylindrical portion that surrounds the opening 42a and is erected on the holder 40 side on the surface of the sensor cover 42 where the opening 42a is formed, and the outer circumference of the cylindrical portion 40c of the holder 40 may be fitted to the inner circumference thereof, and the Z axis may be set as the central axis. In this case, the height of the cylindrical portion is set to be low, so that the fitting of the barrel member 19 and the cylindrical portion 40c by the screw is not hindered, and the height does not reach the screw fitting portion. According to the present configuration, the cylindrical portion standing on the holder 40 side of the sensor cover 42 is fitted into the holder 40, and the sensor cover 42 is fixed to the holder 40, whereby the lens 18 held by the holder 40 and the image pickup device 41 held by the sensor cover 42 can be easily positioned relative to each other even without the boss 42c and the hole 40 d.
In the optical unit 11 with shake correction function according to the present embodiment, the sensor cover 42 and the holder 40 are fixed by an adhesive. However, the sensor cover 42 and the holder 40 may be mechanically fixed to each other by mechanically coupling the sensor cover 42 and the holder 40 with a hook (hook) portion, for example. According to the present configuration, the sensor cover 42 and the holder 40 are fixed to each other more firmly, and the impact strength (impact strength) when the optical unit 11 is dropped or the like is improved.
Industrial applicability
The optical unit 11 with a shake correction function according to the present embodiment is used in an optical device such as a camera-equipped mobile phone, a drive recorder (drive recorder), or a motion camera (action camera) or a wearable camera (wearable camera) mounted on a mobile body such as a helmet (helmet), a bicycle, or a radio control helicopter (radio control helicopter), for example. In such an optical apparatus, if the optical apparatus shakes during shooting, the captured image is disturbed, but the optical unit 11 with shake correction function according to the present embodiment can prevent the captured image from shaking by swinging the movable body 16 with respect to the support body 17 to correct the shake as described above.
Claims (8)
1. An optical unit with a shake correction function, comprising:
a movable body including a lens barrel member that holds an optical element, an image pickup element that receives subject light imaged by the optical element, and a holder that is provided around an outer periphery of the lens barrel member and to which one of a coil or a magnet constituting a swing drive mechanism is mounted; and
a fixed body for supporting the movable body via a swing support mechanism in a freely swinging manner and mounting the other of the coil and the magnet constituting the swing drive mechanism;
in the optical unit with shake correction function, the barrel member is directly fixed to the holder,
a sensor cover fixed on a counter-object side of the holder and integrally provided on the holder, the sensor cover including an opening portion through which the object light is incident to the image pickup element and a covering portion formed around the opening portion to cover the image pickup element,
the sensor cover has a boss formed on a surface of the cover portion facing the holder, and the holder has a hole or a recess formed on a surface facing the cover portion, into which the boss is fitted.
2. The optical unit with shake correcting function according to claim 1, characterized in that: the holder has a cylindrical portion surrounding the outer periphery of the barrel member, the outer periphery of the barrel member being directly fixed on an inner periphery of the cylindrical portion.
3. An optical unit with shake correcting function according to claim 2, characterized in that: the barrel member has an external thread formed on the outer periphery, and the holder has an internal thread formed on the inner periphery of the cylindrical portion and fitted into the external thread.
4. The optical unit with shake correcting function according to claim 1, characterized in that: the sensor cover has a cylindrical portion surrounding the periphery of the opening portion, standing on the holder side, and fitted to the holder.
5. The optical unit with shake correcting function according to claim 1, characterized in that: the sensor cover is fixed to the holder by an adhesive.
6. The optical unit with shake correcting function according to claim 1, characterized in that: the coil of the swing driving mechanism is mounted on the holder, and the magnet of the swing driving mechanism is mounted on the fixed body.
7. The optical unit with shake correcting function according to claim 1, characterized in that: the sensor cover is fixed to the holder by an adhesive.
8. An optical unit with a shake correcting function according to claim 7, characterized in that: the coil of the swing driving mechanism is mounted on the holder, and the magnet of the swing driving mechanism is mounted on the fixed body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017144159A JP2019028112A (en) | 2017-07-26 | 2017-07-26 | Optical unit with tremor correction function |
| JP2017-144159 | 2017-07-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109307969A CN109307969A (en) | 2019-02-05 |
| CN109307969B true CN109307969B (en) | 2021-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810817070.4A Active CN109307969B (en) | 2017-07-26 | 2018-07-24 | Optical unit with shake correction function |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2019028112A (en) |
| KR (1) | KR102137985B1 (en) |
| CN (1) | CN109307969B (en) |
| TW (1) | TWI679485B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7270474B2 (en) * | 2019-06-14 | 2023-05-10 | ニデックインスツルメンツ株式会社 | Optical unit with anti-shake function |
| JP7270473B2 (en) * | 2019-06-14 | 2023-05-10 | ニデックインスツルメンツ株式会社 | Optical unit with anti-shake function |
| JP7344679B2 (en) | 2019-06-14 | 2023-09-14 | ニデックインスツルメンツ株式会社 | Optical unit with shake correction function |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201910894A (en) | 2019-03-16 |
| KR102137985B1 (en) | 2020-07-27 |
| TWI679485B (en) | 2019-12-11 |
| JP2019028112A (en) | 2019-02-21 |
| CN109307969A (en) | 2019-02-05 |
| KR20190012125A (en) | 2019-02-08 |
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