JPH0980563A - Image stabilizer - Google Patents

Abstract

(57) Abstract: An elastic support member that supports a shake correction lens is securely fixed by soldering. Further, the number of assembling steps required for the terminal processing of the coil for driving the shake correction lens is reduced. A shake correction optical system (2) that moves so as to correct image shake, and a plurality of elastic support members (2) that support the shake correction optical system so as to be movable within a plane perpendicular to an optical axis of an image pickup apparatus.
0) and an electric substrate (21) for fixing the elastic supporting member, and the electric substrate is configured to have a through hole portion (22) for fixing the elastic supporting member. Further, a shake correction optical system (2) that moves so as to correct image shake, and an electromagnetic drive device (12, 1) for driving the shake prevention optical system.
3, 15) and the coil (1
4) and a coil support member (11) for supporting the coil, and the coil is configured to be integrally molded with the coil support member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image blur prevention device for preventing image blur due to camera shake in a camera or the like.

[0002]

2. Description of the Related Art Conventionally, as a shake preventing device of this type, in order to prevent shake caused by vibration of a camera at the time of photographing, a part of a photographing lens (a shake correction lens) is arranged in a direction perpendicular to an optical axis. Those that move are known.
Regarding the method of supporting the lens chamber, Japanese Patent Laid-Open No. 2-66536
The elastic supporting method described in Japanese Patent Publication is known.
Further, as a driving method for driving the correction lens, Japanese Patent Application Laid-Open No. HEI-3
An electromagnetic driving method as described in Japanese Patent Publication No. 186823 is known.

[0003]

As a drive unit for driving the shake correction lens, electromagnetic drive has been proposed in the past, but no consideration has been given to the coil fixing method. Regarding the method of fixing the coil, a method of adhering the coil to a support portion for supporting the coil is common,
Not only the number of assembling steps is increased, but also the terminal treatment of the coil after adhesion is required. The wire diameter of the coil was about 0.1 mmφ, and there were accidents in which the wire was caught and broken during assembly, or contacted with a fixing member during driving, resulting in wire breakage.

As a method of supporting the shake correction lens,
Japanese Unexamined Patent Publication No. 2-66536 proposes a supporting method using an elastic supporting member. The fixing method of the elastic supporting member is described by soldering, but details thereof are not considered.

The present invention has been made in view of the above-mentioned problems, and it is possible to securely fix an elastic support member that supports the shake correction lens by soldering, and to perform terminal treatment of a coil that drives the shake correction lens. The purpose is to reduce the number of assembly steps required.

[0006]

In order to achieve this object, a first aspect of the present invention relates to a shake correction optical system (2) which moves so as to correct image shake, and a shake correction optical system which is an optical axis of an image pickup apparatus. A plurality of elastic supporting members (20) movably supporting in a plane perpendicular to the electric substrate and an electric board (21) fixing the elastic supporting members.
And the electric substrate is configured to have a through hole portion (22) for fixing the elastic supporting member.

A second aspect of the invention is a shake correction optical system (2) that moves so as to correct image shake, an electromagnetic drive device (12, 13, 15) for driving the shake prevention optical system, and an electromagnetic drive device. The coil (14) which comprises a drive device and the coil support member (11) which supports a coil are provided, and a coil is comprised so that it may be integrally molded with a coil support member.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a conceptual diagram regarding camera shake. The shake of the camera 1 has 6 degrees of freedom and 3
It is divided into pitching, yawing, and rolling motions, which are rotational motions with degrees of freedom, and motions in the X, Y, and Z directions, which are translational motions with three degrees of freedom. Of these, the AF (autofocus) mechanism takes charge of the translational movement in the Z direction, and correction by the shake prevention device is not necessary. Further, regarding rolling, since the center of rotation thereof is inside the camera and the deterioration of the image is slight, correction of rolling shake is not particularly described in this embodiment. Further, the translational movements in the X and Y directions pose a problem when the photographing magnification is high, but in this embodiment, the translational movements will not be particularly described.

The camera shake motion is monitored by an angular velocity sensor. As the angular velocity sensor, a piezoelectric vibration type angular velocity sensor that detects a Coriolis force generated by rotation is used. Two angular velocity sensors are used: an angular velocity meter for detecting pitching shake and an angular velocity meter for detecting yawing shake. Although an angular acceleration sensor may be used instead of the angular velocity sensor, it is necessary to integrate the output twice in order to convert the angular acceleration signal into angle information. Since it is difficult to accurately obtain the integration constant during this integration, it is difficult to actually use the angular accelerometer as a shake sensor. Also, it is desirable in the system to use an angle sensor instead of the angular velocity sensor, but there is no highly accurate angle sensor that can be mounted on a camera.

In this embodiment, the output of the angular velocity meter is used to detect pitching shake and yawing shake, and the internal optical system is driven in a plane orthogonal to the optical axis so as to cancel the image shake, thereby causing image shake. Is suppressed.

FIGS. 2 and 3 show an image blur correction method when the camera causes pitching blur. FIG.
[Fig. 3] is a schematic cross-sectional view when the camera is not shaken. Reference numeral 1 in the figure denotes a camera body. The subject A forms an image on the film surface B via the shake correction lens 2. FIG. 3 is a schematic cross-sectional view when the camera pitches. When the camera 1 causes pitching, the image formed at the position B on the film surface 8 moves to the position B ′. This is blur on the film surface. This blur can be corrected by driving the shake correction lens 2 in a direction perpendicular to the optical axis. The correction mechanism is shown below.

When the camera 1 causes pitching, the pitching angular velocity meter 3 monitors the pitching angular velocity of the camera. The signal from the angular velocity meter 3 is input to the angular velocity sensor processing circuit 101 and converted into a target drive position signal for the shake correction lens 2. On the other hand, the position of the shake correction lens 2 is
It is monitored by the position detecting element 5. Position detection element 5
The position signal monitored by is input to the control unit 103 through the position detection unit processing circuit 102. Control unit 10
In No. 3, from the target drive position signal of the shake correction lens obtained from the angular velocity sensor (position detecting element 5) and the current position signal indicating the current position of the shake correction lens 2, the difference between these two signals is made small. A control signal is sent to the driver circuit 104. The driver circuit 104 receives the control signal and drives the actuator 4 for driving the shake correction lens 2. By driving the shake correction lens 2 in this manner, the image position can be kept constant even if the camera causes pitching.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a perspective view showing an embodiment of the image blur correction device according to the present invention.

In FIG. 4, the drive unit for driving the shake correction lens in the Y direction is a coil 14y and a magnet 1.
2y and yokes 13y and 15y. Similarly, the drive unit that drives the shake correction lens in the X direction is
Coil 14x, magnet 12x (not shown), yoke 1
It is composed of 3x (not shown) and 15x. Coil 1
4x and 14y are molded integrally with a lens chamber 11 for fixing the shake correction lens 2.

The details of the drive unit are shown in FIG. In FIG. 5, reference numeral 12 is a magnet polarized and polarized in two poles,
Reference numerals 13 and 15 are yokes made of a material having a high magnetic permeability such as iron, and 14 is a coil wound around a direction parallel to the optical axis. The magnet 12 which is polarized and polarized in two poles is attached to the yoke 13 by the magnetic force of the magnet 12. A yoke 15 is attached so as to sandwich the coil 14 so as to face the magnet 12. The magnet 12, the yokes 13 and 15 form a magnetic circuit indicated by a dashed arrow. When a current is applied to the coil 14 in the magnetic force line, an electromagnetic force is generated in a direction (solid arrow direction) perpendicular to the direction of the current flow and the magnetic force line direction according to Fleming's left-hand rule.

Therefore, as shown in FIG. 4, the magnet 1
2 and coil 14 are placed, coil 14x
When energized, a force in the x-axis direction will be generated. Similarly, the y-axis drive actuator including the magnet 12y, the yoke 13y, and the coil 14y generates a force in the y-axis direction when the coil 14y is energized.

As shown in FIG. 4, the movement of the shake correction lens 2 is monitored by the optical position detecting devices 18x and 18y which are separately installed in the x-axis direction and the y-axis direction.
A PSD (Position Seneitive Device), which is a composite photodiode, is used for the optical position detection device 18. In the lens chamber 11 for fixing the shake correction lens 2,
A slit 16 made of a composite material having a low infrared reflectance on the surface is attached. x-axis direction detection slit 1
A slot is formed in 6x in the y-axis direction. Also, y
A slot is formed in the axial direction detection slit 16y in the x-axis direction.

The light projected by the IRED 17x passes through a slit 16x attached to the lens chamber 11 and enters a one-dimensional PSD 18x for position detection. Lens room 1
The movement of the slit 16x attached to No. 1, that is, the movement of the shake correction lens 2 becomes the movement of light incident on the one-dimensional PSD 18x. When the distance between the IRED and the PSD is long and the distance between the slit and the PSD is short, the length of the PSD detection portion is short, which is good, and the PSD can be downsized. But I
If the distance between the RED and the PSD is increased, the absolute amount of light incident on the PSD is reduced, which causes S / N deterioration. Normally, the distance between the slit and the PSD is made as close as possible to the non-contacting limit, and the distance between the IRED and the PSD is arranged as far as the S / N allows.

A lens chamber 11 for holding the shake correction lens 2
Are cantilevered by four elastic support members 20 having high conductivity. The elastic support member 20 having high conductivity is
It refers to a copper alloy such as beryllium copper or phosphor bronze, or an elastic supporting member other than a copper alloy, which has been subjected to a highly conductive surface treatment such as gold plating or nickel plating. These elastic support members 20 are attached to a copper piece 19 that is integrally inserted into the lens chamber 11. The copper piece 19 has a hole in the optical axis direction, and the elastic support member 20 is soldered through the hole. The inner diameter of the hole provided in the copper piece 19 is
The diameter of the elastic support member is +0.5 mm or less.

This is because if the diameter of the hole is too large, the solder will flow into the elastic range of the elastic support member.
Clear the clearance between the inner diameter of the hole and the outer diameter of the elastic support member.
By setting the thickness to 5 mm or less, it is possible to prevent the solder from flowing into the elastic range of the elastic support member. When solder adheres to the elastic range of the elastic support member, the spring constant of the elastic support member changes, and the primary resonance frequency of the lens chamber 11 and the spring mass system formed by the elastic support member changes. Further, variations in the elastic ranges of the four elastic support members 20 cause tilting of the shake correction lens 2 when the lens chamber 11 moves in a plane orthogonal to the optical axis. This is because the lens chamber 11 has 4
This is because it is supported by the elastic support member 20 of the book and forms a kind of link mechanism.

FIG. 6 shows a graph of the amount of displacement of the lens chamber in the optical axis direction with respect to the amount of movement when the lens chamber moves in a plane orthogonal to the optical axis (in the shake correction drive plane). Figure 6
Therefore, when the length of the elastic support member is 8 mm and the shake correction lens moves by 1.0 mm, the displacement amount in the optical axis direction is about 70 μm. Also, when solder adheres to the elastic support member and the length of the elastic portion is 6 mm, the displacement amount of the shake correction lens in the optical axis direction becomes 100 μm. Solder adheres to one of the four elastic supporting members, and the length of the elastic portion is 8 mm to 6 mm.
If the distance between the elastic support members is 20 mm, the shake correction lens will be tilted up to 5 min when driven by 1.0 mm. In order to prevent the adhesion of the solder, the clearance between the diameter of the hole provided in the copper piece 19 and the diameter of the elastic supporting member is set to 0.5 mm or less, so that the adhesion of the solder to the elastic portion is prevented and the shake correction lens can be accurately operated. It becomes possible to drive.

FIG. 7 shows the structure inside the mold of the lens chamber 11. The copper pieces 19a to 19d that are integrally inserted into the lens chamber 11 are configured to be connected to the ends of the coils 14x or 14y inside the lens chamber 11. That is, the copper pieces 19a and 19b are located at both ends of the y-axis direction driving coil 14y, and the copper pieces 19c and 19d are formed.
Are connected to both ends of the x-axis direction driving coil 14x inside the mold. The connecting parts are copper pieces 19a to 1
The end of the coil 14x or 14y is entangled with 9d and then soldered. The wire diameter of the coil is a thin copper wire having a diameter of about 0.1 mm. If it is exposed to the outside, it may be caught during assembly, or may come into contact with the fixing member when the correction lens 2 is driven and cut. If the coil 14x or 14y is broken, the correction lens 2 cannot be driven. By passing the end of the coil 14x or 14y through the inside of the mold, it becomes possible to prevent such an accident.

In the molding of the lens chamber 11, first, the ends of the coils 14x and 14y are entwined with the copper pieces 19a to 19d and soldering is performed. At this time, the copper pieces 19a to 19d need to have holes for positioning on the mold and a sufficient size for fixing to the mold. Next, coils 14x and 14y
The end of which the copper pieces 19a to 19d are attached is fixed to a mold, and a resin is poured into the mold to perform molding. Finally, the copper piece 19a
Cut an extra portion of ~ 19d. By molding the lens chamber 11 in this manner, the ends of the coils 14x and 14y are not exposed to the outside, and the coils 14x and 1 are not exposed.
It is possible to manufacture subassemblies including 4y terminal processing.

As shown in FIG. 4, the elastic support member 20 is fixed to the through hole 22 of the electric board 21 by soldering. FIG. 8 shows a cross section of a mounting portion between the elastic supporting member 20 and the electric board 21. The elastic support member 20 is soldered through a through hole 22 provided in the electric board 21. When soldering is performed on a normal pattern (a pattern without through holes), a moment is generated on the pattern surface in the direction in which the pattern is distorted each time the correction lens 2 is driven, and as the driving is repeated, Like 9
The pattern may be distorted from the electric substrate 21. The correction lens 2 is tilted due to the pattern being sharp and the resolution is lowered. By using the through hole instead of the normal pattern, it is possible to prevent the pattern from being rippled and to maintain the support accuracy of the correction lens 2. Further, the clearance between the inner diameter of the through hole and the diameter of the elastic supporting member is preferably 0.5 mm or less. This is the same as the reason why the clearance between the inner diameter of the holes of the copper pieces 19a to 19d and the outer diameter of the elastic supporting member 20 is 0.5 mm or less, and prevents the solder from adhering to the elastic region of the elastic supporting member 20. This is because.

As shown in FIG. 4, the through hole 22 corresponds to the electric board 2.
It is electrically connected to the pattern 23 on the upper surface 1. Therefore, by supplying an electric current from the pattern 23, the coils 14x and 14y are energized via the elastic supporting member 20.

According to the embodiment described above, firstly,
A shake correction optical system that moves so as to correct image shake caused by shake of the image pickup apparatus, and a plurality of elastic support members and elastic supports that support the shake correction optical system so as to be movable in a plane perpendicular to the optical axis of the image pickup apparatus. Since the electric board for fixing the member and the through hole for fixing the elastic supporting member are provided in the electric board, the shake correcting lens can be stably maintained and the durability of the shake correcting apparatus can be increased.

Secondly, since the clearance between the inner diameter of the through hole and the outer diameter of the elastic support member is 0.5 mm or less, the performance of the shake correction device can be kept uniform.

Thirdly, a shake correction optical system that moves so as to correct image shake caused by shake of the image pickup device, an electromagnetic drive device for driving the shake prevention optical system, and a coil that constitutes the electromagnetic drive device. Since the coil and the coil are integrally molded with the supporting member that supports the coil, the assemblability of the shake correction apparatus is improved.

Fourthly, since the coil supporting member also serves as the lens chamber of the shake correcting optical system, the assemblability of the shake correcting apparatus is improved.

Fifth, since the terminal for supplying a current to the coil and the terminal of the coil are electrically connected through the terminal and the inside of the coil supporting member, the yield of the shake correcting apparatus is improved and the reliability is improved. Can be increased.

Sixth, a plurality of elastic supporting members that support the shake correction optical system so as to be movable in a plane perpendicular to the optical axis of the image pickup device and the terminals are integrally molded with the coil supporting member, and the elastic supporting members are attached to the terminals. Is fixed, the yield of the shake correction apparatus can be improved and the reliability can be increased.

Seventh, the terminal has a hole for fixing the elastic support member, and the clearance between the inner diameter of the terminal and the outer diameter of the elastic support member is 0.5 mm or less, so that the performance of the shake correction device is uniform. Can be kept at

[0034]

As described above, according to the image shake correcting apparatus of the present invention, the shake correcting optical system (2) that moves so as to correct the image shake, and the shake correcting optical system are perpendicular to the optical axis of the image pickup apparatus. Elastic support members (20) for movably supporting in a flat plane
And an electric substrate (21) for fixing the elastic supporting member, and the through hole portion (22) for fixing the elastic supporting member is provided on the electric substrate, so that the elastic supporting member for supporting the shake correction lens is provided. It becomes possible to securely fix it by soldering.

Further, a shake correction optical system (2) that moves so as to correct image shake, an electromagnetic drive device (12, 13, 15) for driving the shake prevention optical system, and an electromagnetic drive device are configured. The coil (14) and the coil supporting member (11) for supporting the coil are provided, and the coil is formed integrally with the coil supporting member. Therefore, it is necessary to process the coil driving the shake correction lens. It is possible to reduce the number of assembly steps.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an image blur correction device.

FIG. 2 is a block connection diagram showing an example of an image blur correction device.

FIG. 3 is a block connection diagram showing an example of an image blur correction device.

FIG. 4 is a block connection diagram showing an embodiment of an image blur correction device according to the present invention.

FIG. 5 is a top view showing an embodiment of the image blur correction device according to the present invention.

FIG. 6 is a characteristic diagram showing an embodiment of an image blur correction device according to the present invention.

FIG. 7 is a plan view showing an embodiment of an image blur correction device according to the present invention.

FIG. 8 is a front view showing an embodiment of the image blur correction device according to the present invention.

FIG. 9 is a front view showing an embodiment of the image blur correction device according to the present invention.

[Explanation of symbols]

 1 camera 2 shake correction lens 3 pitching angular velocity meter 4 actuator 5 position detection element 8 film surface 11 lens chamber 12 magnet 13 yoke 14 coil 15 yoke 16 slit 17 IRED 18 optical position detection device (PSD) 19 copper piece 20 elastic support member 21 Electric Board 22 Through Hole 23 Pattern

Claims (7)

[Claims] 1. A shake correction optical system that moves so as to correct image shake, a plurality of elastic support members that movably support the shake correction optical system in a plane perpendicular to an optical axis of an image pickup apparatus, and the elasticity. An image blur correction device, comprising: an electric board for fixing a supporting member, wherein the electric board has a through hole portion for fixing the elastic supporting member. 2. The elastic member according to claim 1, wherein the through hole portion and the elastic supporting member are fixed by soldering, and a clearance between an inner diameter of the through hole portion and an outer diameter of the elastic supporting member is such that the solder is elastic. An image blur correction device having a gap that does not flow to the outer periphery of a support member. 3. A shake correction optical system that moves so as to correct image shake, an electromagnetic drive device for driving the shake prevention optical system, a coil that constitutes the electromagnetic drive device, and a support for the coil. An image blur correction device, comprising: a coil supporting member for forming the coil, wherein the coil is integrally molded with the coil supporting member. 4. The image blur correction device according to claim 3, further comprising a lens chamber for holding a lens of the image blur correction optical system, wherein the coil support member also serves as the lens chamber. 5. The coil supporting member according to claim 3, wherein the coil supporting member has a terminal for passing an electric current through the coil, and an end of the coil is electrically connected to the terminal through the inside of the coil supporting member. An image blur correction device characterized by being provided. 6. The elastic support member according to claim 5, further comprising an elastic support member that supports the shake correction optical system so as to be movable in a plane perpendicular to an optical axis of the image pickup device, and the terminal is integral with the coil support member. The image blur correction device is characterized in that the elastic support member is fixed to the terminal. 7. The terminal according to claim 6, wherein the terminal has a hole for fixing the elastic supporting member, the terminal and the elastic supporting member are fixed by soldering, and the inner diameter of the terminal and the elastic member are fixed. The image blur correction device is characterized in that the clearance from the outer diameter of the support member is a gap in which solder does not flow out to the outer periphery of the elastic support member.