JPH0980499A - Image blur correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure by simplifying an electrical connection. SOLUTION: In order to correct the image blur produced by a vibration, the image blur correcting device is provided with a blur correcting optical system 10 which can be moved so as to change the optical axis of a photographic optical system, a substrate 30 equipped with a pattern for transmitting an electrical signal, a position detecting part (slit 16, light emitting element 17 and light receiving element 18) for detecting the position of the blur correcting optical system 10. The light emitting element 17 of the position detecting part is installed on the substrate 30, and the element 17 is electrically connected to the pattern on the substrate 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image blur correction device for correcting image blur caused by camera shake in a camera or the like.

[0002]

2. Description of the Related Art As a conventional image blur correction device of this type,
In order to correct the image blur caused by the vibration of the camera at the time of shooting, some optical system of the shooting optical system (shake correction optical system) is moved in a direction substantially perpendicular to the optical axis, and It is known to change the optical axis of the system. FIG.
FIG. 1 is a sectional view showing an example of a conventional image blur correction device. The blur correction optical system 10 is held by a lens barrel 21. An electromagnetic actuator is arranged near the lens barrel 21. The electromagnetic actuator is for driving the lens barrel 21, that is, the shake correction optical system 10. The electromagnetic actuator includes a magnet 12 and a yoke 13.
And the coil 14 and the like. This coil 1
By causing a current to flow through the electromagnetic actuator 4, the electromagnetic actuator generates an electromagnetic force to drive the lens barrel 21.

Further, the image blur correction device is provided with a position detection device for detecting the position of the blur correction optical system 10. The position detecting device is composed of a slit 16, a light emitting element (IRED) 17, a light receiving element (PSD) 18, and the like. The slit 16 is provided integrally with the lens barrel 21, and a hole through which light can be transmitted is formed in a part thereof. The light emitting element 17 and the light receiving element 18 are arranged so as to face each other with the slit 16 interposed therebetween. The light emitting element 17 is attached to the fixing member 100. When the light is emitted from the light emitting element 17, the light passes through the slit 16 and is incident on the light receiving element 18. As a result, the movement of the slit 16, that is, the movement of the blur correction optical system 10 becomes the movement of the light incident on the light receiving element 18.

[0004]

However, the above-mentioned conventional image blur correction device has the following problems. First, in order to pass a current through the light emitting element 17, a vinyl line, a flexible printed circuit board (FPC) or the like must be connected to the light emitting element 17, and many parts must be used for the wiring member. There was a problem that it became complicated. Further, there is a problem that the assembling work becomes difficult and the failure rate increases due to the large number of parts.

Secondly, there are the following problems. FIG. 12 is a diagram showing a state of transmitted light of the position detection device. Light receiving element 1
Reference numeral 8 outputs an electric current according to the position of the center of gravity of the slit light on the light receiving surface, and calculates the electric current to obtain the shake correction optical system 1
The position of 0 is detected. In FIG. 12, D1 is the distance between the light emitting element 17 and the light receiving element 18, and D2 is the distance between the slit 16 and the light receiving element 18. When the slit 16 is directly below the light emitting element 17, that is, when the shake correction optical system 10 is at the drive center position, the position output of the light receiving element 18 and the center position of the slit 16 match ((a) in the figure). . However, when the blur correction optical system 10 is driven and the slit 16 is displaced from directly below the light emitting element 17, the position of the slit 16 and the position output of the light receiving element 18 do not match, and an error of δx1 occurs ((b) in the figure) ). This error is given by (Equation 1) .delta.x1 = D2.multidot.x / (D1-D2). Therefore, δ is proportional to the movement amount x of the slit 16.
x1 becomes large.

FIG. 13 is a graph showing the position output of the light receiving element 18 with respect to the movement amount x of the slit 16 in the position detecting device, and the drive center position of the shake correction optical system 10 is taken as the origin. The dotted line shows the movement of the center of the slit 16. In the range shown as an effective stroke in FIG. 13, the amount of movement of the slit 16 and the position output of the light receiving element 18 are proportional, and position detection can be performed accurately within this stroke. Further, when the movement amount x of the slit 16 increases, the light emitting element 1
The light from 7 is eclipsed by the thickness of the slit 16, and when the amount of movement is further increased, the slit light is deviated from the light receiving element 18, so that the position output of the light receiving element 18 is not proportional to the movement amount x of the slit 16. . Therefore, even in the graph, the part where x is large is distorted.

In the image blur correction device shown in the conventional example, D1 cannot be lengthened due to its structure. Therefore, the slit light is deviated from the light receiving element 18 before the movement amount x of the slit 16 becomes too large. Also, D1
When is small, the influence of the light shading due to the thickness of the slit 16 becomes large. From the above, there is a problem that when D1 is small, the effective stroke in the figure is limited to a narrow range near the drive center position of the shake correction optical system 10.
As a result, when the drive amount of the shake correction optical system 10 is large, the position of the shake correction optical system 10 cannot be accurately detected, and the accuracy cannot be increased. On the other hand, when the drive amount of the blur correction optical system 10 is small, the correction range becomes small and the image blur correction effect is deteriorated.

An object of the present invention is, firstly, to simplify the electrical connection and simplify the structure. Secondly, a structure in which the distance between the light emitting element and the light receiving element is long is used to perform image blur correction with high accuracy.

[0009]

In order to solve the above-mentioned problems, the invention of claim 1 is movable so as to change the optical axis of the photographing optical system in order to correct the image blur caused by the vibration. An image blur correction device comprising: a blur correction optical system; a substrate having a pattern for transmitting an electric signal; and a position detection unit that detects the position of the blur correction optical system, wherein at least the position detection unit. Some of the constituent members are provided on the substrate and are electrically connected to the pattern on the substrate.

According to a second aspect of the present invention, in the image blur correction device according to the first aspect, the position detection section optically detects the position of the blur correction optical system by a light emitting element and a light receiving element. One of the light emitting element and the light receiving element is provided on the substrate and is electrically connected to the pattern on the substrate. According to a third aspect of the present invention, in the image blur correction device according to the first or second aspect, a drive force generation unit that generates an electromagnetic force for driving the blur correction optical system by a magnetic body and a coil is provided. A supporting member which is formed of an elastic material having conductivity and which is mounted so as to support the shake correction optical system and to connect the pattern on the substrate and the coil of the driving force generating unit. It is characterized by including.

According to a fourth aspect of the present invention, in the image blur correction apparatus according to the third aspect, the image blur correction apparatus is disposed between the substrate and the blur correction optical system, and is for attaching the magnetic body of the driving force generating section. A mounting plate is provided, the substrate is fixed to the mounting plate, and the constituent members of the driving force generation unit mounted on the substrate are arranged in an opening formed in the mounting plate. Is characterized by. According to a fifth aspect of the present invention, in the image blur correction device according to the third or fourth aspect, a driver circuit for the driving force generation unit is provided on the substrate.

[0012]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a first embodiment of an image blur correction device according to the present invention. In FIG. 1, an image blur correction device includes a blur correction optical system 10, a driving force generation unit (12, 13, 14, 15),
It is composed of a position detector (16, 17, 18) and the like. The blurring correction optical system 10 is a lens group that moves in a direction substantially perpendicular to the optical axis to correct image blurring during shooting. The blur correction optical system 10 is held by a lens barrel 21. Four support rods 11a to 11d are attached to the lens barrel 21 so as to surround the outer periphery of the shake correction optical system 10 at intervals of approximately 90 °. The support rod 11 is made of an elastic material having high conductivity.

The driving force generating portion drives the blur correction optical system 10 by an electromagnetic force and therefore generates a driving force. The driving force generator includes the yokes 13 and 15 and the magnet 12
And a coil 14. Further, these constituent members include the yokes 13a and 15a for driving the shake correction optical system 10 in the X-axis direction, the magnet 12a, and the coil 14a, and the yoke 13 for driving the Y-axis direction.
b, 15b, the magnet 12b, and the coil 14b.

FIG. 2 is a plan view showing in detail the blur correction optical system 10, the lens barrel 21, and the like. In FIG. 2, the coil 14
Are attached to the lens barrel 21. And coil 1
4a and 14b are arranged so as to deviate from each other by approximately 90 ° (in a direction substantially orthogonal to each other). The lens barrel 21 includes conductor portions 14a-1, 14a-2, and 14b electrically connected to the coil 14.
-1, and 14b-2 are provided, and these terminals and the support rods 11a to 11d are electrically connected, respectively.

In FIG. 1, a top plate 19 and a bottom plate 20 are arranged on both sides of the shake correction optical system 10 in the optical axis direction. A yoke 15 is attached to the top plate 19. The bottom plate 20 also has a magnet 12 and a yoke 13.
Is attached. The magnet 12 and the yokes 13 and 15 are arranged to face the coil 14 with an appropriate gap.

The position detector is a light emitting device 17 (IRED).
And a light receiving element 18 (PSD) and a slit 16. The slit 16 is formed with a hole through which the light emitted from the light emitting element 17 can be transmitted. The slits 16a and 16b are provided integrally with the lens barrel 21, respectively, and are arranged at an angle of about 90 ° around the optical axis (see FIG. 2). The light emitting element 17 is fixed to the substrate 30. The light receiving element 18 is fixed to the bottom plate 20. The light emitting element 17 and the light receiving element 18 include the slit 16
Are arranged opposite to each other.

A substrate 30 is arranged outside the top plate 19 (on the side opposite to the shake correction optical system 10). FIG. 3 is a plan view showing the substrate 30 in detail. The substrate 30 and the top plate 19 are screwed together by screws 40a to 40d.
The conductor terminal 33 (33a to 33) is provided at one end of the substrate 30.
d) and 37 (37a to 37d) are adhered. Then, on the substrate 30, patterns 32 (32 a to 32) electrically connected to the conductor terminals 33 and 37, respectively.
d) and 36 (36a to 36d) are formed. The patterns 32 and 36 are for transmitting electric signals, and holes 31a to 31d and holes 35a to 35d are formed at the other ends of the patterns 32 and 36, respectively. Then, the support rods 11a to 11d are passed through the holes 31a to 31d, respectively, and soldered and fixed.
Therefore, the support rod 11 and the pattern 32 are electrically connected. As a result, the electrical signal supplied to the conductor terminal 33 is transmitted to the pattern 32 of the substrate 30, the support rod 11, and the conductor portions 14a-1, 14a-2, 14b-1, and 14b-.
2 is transmitted to the coil 14.

Further, the light emitting element 17 is provided in the holes 35a and 35b.
The light emitting element 17b is fixed by soldering the light emitting element 17b to the holes 35c and 35d. Therefore, the light emitting element 17 and the pattern 35 are electrically connected. As a result, the electric signal supplied to the conductor terminal 37 is transmitted to the pattern 35 of the substrate 30.
And is transmitted to the light emitting element 17. Therefore, with the above configuration, many wiring members are not used, the number of parts is reduced, the structure is simplified, and the assembly is facilitated, and then the electronic signal is transmitted to the coil 14 and the light emitting element 17. Will be able to. Moreover, since the number of parts is reduced, the failure rate can be reduced.

When an electric signal is supplied to the conductor terminals 33a and 33b of the substrate 30, the electric signal is transmitted to the coil 14a, and the electromagnetic force generated by the yokes 13a and 15a of the driving force generating portion, the magnet 12a, and the coil 14a causes The shake correction optical system 10 is driven in the X-axis direction. Similarly, when an electric signal is supplied to the conductor terminals 33c and 33d of the substrate 30,
It is transmitted to the coil 14b, and the yoke 13 of the driving force generator is generated.
The shake correction optical system 10 is driven in the Y-axis direction by the electromagnetic force generated by b, 15b, the magnet 12b, and the coil 14b. That is, the blur correction optical system 10 is driven in a direction substantially perpendicular to the optical axis to correct the image blur.

The support rod 11 for supporting the substrate 30 and the top plate 19
The vicinity where is fixed is fixed by a screw 40. In this way, the substrate 30 is in close contact with the top plate 19 at the position where the support rod 11 is fixed. As a result, the effective lengths of the support bars 11a to 11d become equal. Therefore, even if the shake correction optical system 10 moves, the tilt of the shake correction optical system 10 can be prevented,
The optical performance can be kept good. When the image blur correction device is mass-produced, even if the distortion of the substrate 30 varies, the variation in optical performance can be eliminated.

The movement of the blur correction optical system 10 in the X-axis direction is
The light is detected by the light emitting element 17a, the slit 16a, and the light receiving element 18a of the position detector. That is, the light emitting element 1
The light emitted from 7a passes through the slit 16a,
It is incident on the light receiving element 18a. The light receiving element 18a detects the position of the center of gravity of the light passing through the slit 16a, and outputs a current accordingly. Similarly, the movement of the shake correction optical system 10 in the Y-axis direction is detected by the light emitting element 17b, the slit 16b, and the light receiving element 18b of the position detector.

FIG. 4 is a sectional view of the image blur correction device showing a section taken along the center line of FIG. The top plate 19 is provided with a hole into which the light emitting element 17 is inserted. Further, the bottom plate 20 is provided with a hole into which the light receiving element 18 is inserted, and the light receiving element 18 is arranged in this hole. Therefore, with such a structure, the light emitting element 1
The distance D1 'between 7 and the light receiving element 18 can be made longer than the distance D1 (FIG. 11) in the conventional example. FIG. 5 is a diagram showing a state of transmitted light of the position detecting device in the present embodiment, and corresponds to FIG. 12 in the conventional example. As described above, comparing FIG. 5 with FIG. 12, D1 '> D1. Further, since D2 hardly changes between this embodiment and the conventional example, from (Equation 1),
x1 '<δx1.

Therefore, when the movement amount of the slit 16 is x, x + δx1 '<x + δx1. This allows
In the conventional position detecting device, even if the amount of movement x is such that the slit light is deviated from the light receiving element 18 and the position cannot be detected, in the position detecting device of the present embodiment, the slit light is removed from the light receiving element 18. The position can be detected. Further, since the distance between the light emitting element 17 and the light receiving element 18 is long, it is possible to reduce the influence of the beam eclipse due to the thickness of the slit 16.

FIG. 6 is a graph showing the position output of the light receiving element 18 with respect to the movement amount x of the slit 16 in the position detecting device of this embodiment, and corresponds to FIG. 13 in the conventional example. Light-emitting element 1 compared to the conventional example
Since the distance between 7 and the light receiving element 18 can be lengthened, δx1 in (Equation 1) can be reduced, and the influence of light eclipse due to the thickness of the slit 16 can be reduced. As a result, the effective stroke can be widened. As a result, the amount of movement of the blur correction optical system 10 can be increased. Further, it becomes possible to correct even a large blurring that could not be corrected in the past, and the image blurring correction effect can be enhanced.

FIG. 7 is a front view and a back view showing a substrate 30 'in the second embodiment of the image blur correction device according to the present invention. The substrate 30 'is a double-sided substrate having a pattern formed on both sides. In FIG. 7, the same parts as those of the substrate 30 (FIG. 3) of the first embodiment are designated by the same reference numerals.
The conductor terminals 35a ′ to 35d ′ are terminals for mounting the light emitting element 17. By using such a double-sided substrate, the chip type light emitting element 17 can be used. In the second embodiment, the conductor terminal 35a '.
A chip type light emitting element is directly soldered to ~ 35d '.

FIG. 8 is an exploded perspective view showing a third embodiment of the image blur correction device according to the present invention. The third embodiment is different from the first embodiment (FIG. 1) in that the light emitting element 17 is attached to the bottom plate 20 side and the light receiving element 18 is provided.
Is attached to the substrate 30 ″. FIG.
FIG. 9A is a front view and a rear view showing the substrate 30 ″ of FIG. The substrate 30 ″ is a double-sided substrate having a pattern formed on both sides. In FIG. 9, the substrate 3 according to the first embodiment
The same parts as 0 (FIG. 3) are denoted by the same reference numerals. Conductor terminals 45a to 45h are provided on the substrate 30 ″. The light receiving element 18b is attached to the conductor terminals 45a to 45d.
However, the light receiving element 18a is attached to the conductor terminals 45e to 45h,
Each is soldered. Conductor terminals 45b and 45
c is electrically connected to the conductor terminals 47b and 47c via the patterns 46b and 46c, respectively. Similarly, the conductor terminals 45f and 45h are connected to the conductor terminals 47f and 47h via the patterns 46f and 46h, respectively.
It is electrically connected to h. Also, the conductor terminal 45d
And 45g are both electrically connected to the conductor terminal 48 through the pattern 46d.

The anode of the light receiving element 18b is soldered to the conductor terminals 45b and 45c, and the anode of the light receiving element 18a is soldered to the conductor terminals 45f and 45h. The light receiving element 18 outputs a current from the anode according to the position of the slit light on the light receiving surface. Since the anode of the light receiving element 18 and the conductor terminal 47 are electrically connected to each other on the substrate 30 '', the light receiving element 1 is connected to the light receiving element 1 from the conductor terminal 47.
You can read 8 outputs. In addition, the conductor terminal 45a
And 45d are soldered to the cathode of the light receiving element 18b, and the conductor terminals 45e and 45g are soldered to the cathode of the light receiving element 18a. Of these, the conductor terminals 45d and 45
The cathode attached to g is commonly connected to the conductor terminal 48, and a bias voltage can be applied from the conductor terminal 48 to the two light receiving elements 18a and 18b. The cathodes of the light receiving elements 18a and 18b may not be commonly used, and bias voltages may be separately applied to them.

As described above, by mounting the support rod 11 and the two light receiving elements 18a and 18b on the same substrate 30 '', one FPC having nine patterns is formed on the conductor terminals 33, 47 and 48. It becomes possible to drive the shake correction optical system 10 and to perform electrical processing around the light-receiving element 18 by mounting it on the. Therefore, as compared with the conventional example, the number of parts of the image blur correction device is reduced, and the number of failures can be reduced.

FIG. 10 is a sectional view of the image blur correction device showing a section taken along the center line of FIG. 10, those parts which are the same as those corresponding parts in FIG. 4 are designated by the same reference numerals. In this embodiment, the shape of the lens barrel 21 is different from that of the first embodiment so that the distance between the slit 16 and the light receiving element 18 is substantially the same as that of the first embodiment. This is to prevent δx1 from increasing as D2 becomes longer and the effective stroke from becoming narrower in (Equation 1). In FIG. 10, the light receiving element 18 attached to the substrate 30 '' is
It is arranged so as to enter a hole formed in the top plate 19. Further, the light emitting element 17 is arranged so as to enter a hole formed in the bottom plate 20. As a result, the distance D1 '' between the light emitting element 17 and the light receiving element 18 can be increased as compared with the conventional example. Therefore, it is possible to improve the accuracy of the position detection unit and increase the drive amount of the shake correction optical system 10. As a result, it becomes possible to correct a large blur that cannot be corrected by the conventional technique.

The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and the following various modifications are possible within an equivalent range. For example, the position detecting unit including the light emitting element 17, the slit 16, and the light receiving element 18 is an optical means, but the position may be detected by means other than this means. For example, there is one using a magnetic sensor such as an MR sensor. If the image blur correction device has enough space, the driver circuit of the actuator may be fixed to the substrate 30 or the like. It should be noted that the image blur correction device according to the present embodiment can be applied to other image capturing devices in addition to the camera.

[0031]

According to the present invention, many wiring members are not used, the number of parts can be reduced, the structure can be simplified, and the assembly can be simplified. Furthermore, since the number of parts is reduced, the failure rate can be reduced. Further, according to the third aspect of the invention, the distance between the light emitting element and the light receiving element can be increased, so that the position can be detected even when the image blur is large. Further, it is possible to reduce the influence of light beam eclipse due to the thickness of the slit.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of an image blur correction device according to the present invention.

FIG. 2 is a plan view showing in detail a blur correction optical system 10, a lens barrel 21 and the like.

FIG. 3 is a plan view showing the substrate 30 in detail.

FIG. 4 is a cross-sectional view of the image blur correction device showing a cross section taken along the center line of FIG.

5 is a diagram showing a state of transmitted light of the position detection device in the embodiment of FIG.

6 is a graph showing the position output of the light receiving element 18 with respect to the movement amount x of the slit 16 in the position detecting device of the embodiment of FIG.

7A and 7B are a front view and a rear view showing a substrate 30 ′ in a second embodiment of the image blur correction device according to the present invention.

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

9 is a front view and a back view showing the substrate 30 ″ of FIG.

10 is a cross-sectional view of the image blur correction device showing a cross section taken along the center line of FIG.

FIG. 11 is a sectional view showing an example of a conventional image blur correction device.

FIG. 12 is a diagram showing a state of transmitted light of a position detection device.

FIG. 13 is a graph showing the position output of the light receiving element 18 with respect to the movement amount x of the slit 16 in the position detecting device.

[Explanation of symbols]

 10 Shake Correction Optical System 11 Support Rod 12 Magnet 13 Yoke 14 Coil 15 Yoke 16 Slit 17 Light-Emitting Element 18 Light-Receiving Element 19 Top Plate 20 Bottom Plate 21 Lens Tube 30 Substrate

Claims (5)

[Claims] 1. A blur correction optical system that is movable so as to change the optical axis of a photographing optical system to correct an image blur caused by vibration, and a substrate having a pattern for transmitting an electric signal. An image blur correction device comprising a position detection unit that detects the position of the blur correction optical system, wherein at least a part of the component members of the position detection unit is provided on the substrate, and the pattern on the substrate is provided. An image blur correction device characterized in that it is electrically connected to. 2. The image blur correction device according to claim 1, wherein the position detector optically detects a position of the blur correction optical system by a light emitting element and a light receiving element. Alternatively, one of the light receiving elements is provided on the substrate and is electrically connected to the pattern on the substrate. 3. The image blur correction device according to claim 1, wherein a magnetic force and a coil generate a driving force generation unit that generates an electromagnetic force for driving the blur correction optical system, and a conductive member. And a supporting member that is formed of an elastic material that has a property of supporting the blur correction optical system and that is mounted so as to connect the pattern on the substrate and the coil of the driving force generating unit. An image blur correction device characterized by the above. 4. The image blur correction device according to claim 3, further comprising a mounting plate disposed between the substrate and the blur correction optical system for mounting the magnetic body of the driving force generation unit, The image is characterized in that the substrate is fixed to the attachment plate, and the constituent members of the driving force generation unit attached to the substrate are arranged in an opening formed in the attachment plate. Image stabilization device. 5. The image blur correction device according to claim 3 or 4, wherein a driver circuit of the driving force generation unit is provided on the substrate.