JP4545296B2 - Blur correction device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shake correction apparatus for correcting shake due to camera shake or the like mounted on a camera or the like.
[0002]
[Prior art]
Conventionally, in order to prevent camera shake, various optical devices including a shake correction device that corrects an imaging position by moving a correction lens in a direction perpendicular to the optical axis according to camera shake have been proposed. In order to move the lens in a plane perpendicular to the lens, a driving device is provided in two directions, and the lens is moved and controlled at an arbitrary position by dividing the driving force into two components. At that time, as disclosed in JP-A-3-188430 and JP-A-10-254012, a guide shaft, a parallel key and a keyway for guiding the correction lens so as not to rotate around the optical axis are applied. Mechanisms have been used.
[0003]
[Problems to be solved by the invention]
However, if a mechanism such as a guide shaft or a keyway is used, a guide is required in each direction because of two-way components, so there is a wide range for two guide shafts and two keyway mechanisms. Space was taken up. Therefore, it has been an obstacle to make the apparatus compact.
[0004]
[Means for Solving the Problems]
The present invention aims to solve such problems and make the apparatus compact, and corrects a blur correction lens, a mirror chamber holding the correction lens, and a right angle in a plane perpendicular to the optical axis. And a guide using a gear for restricting rotation around the optical axis, and the guide is provided using the rack and gear provided in the mirror chamber. It is a correction device.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
According to the configuration of the present invention, the mirror lens holding the correction lens receives a force from the two-direction driving device, and the correction lens moves in an arbitrary direction. At this time, the correction lens is guided by rotating the gear in the first direction so that the correction lens does not rotate, and is guided by sliding the gear and rack tooth surfaces instead of the keyway in the second direction. The lens shifts. In the second direction, the gear shaft may be used as a guide for shifting.
[0006]
【Example】
DESCRIPTION OF EMBODIMENTS Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.
[0007]
1 to 4 are schematic views showing the configuration of an embodiment of the present invention. FIG. 1 is a plan view showing a portion of a shake correcting device, and FIG. 2 is a cross-sectional view taken along line AA in FIG. 3 is a sectional view taken along the line BB in FIG. 1 showing the periphery of the guide, and FIG. 4 is a sectional view taken along the line CC in FIG. 1 showing the periphery of the position detection element. In FIG. 1, illustration of the electronic substrate 12, the yoke 6, and the magnet 5 is omitted.
[0008]
As shown in FIG. 1, the shake correction apparatus is composed of a main body 4 and a mirror chamber 2. The mirror chamber 2 holds a shake correction lens 1, and coils 3A and 3B of a voice coil motor are bonded to each other.
[0009]
In addition, the mirror chamber 2 is restricted from moving in the optical axis direction by a roller 7 so that a surface perpendicular to the optical axis can be moved. A gear shaft base 9 for allowing the gear shaft 8 to rotate is attached to the main body 4. Gears 10 are press-fitted into both ends of the gear shaft 8.
[0010]
FIG. 2 is a cross-sectional view showing the periphery of the voice coil motor. A yoke 6 to which a magnet 5 is bonded is attached to the main body 4 in a paired state with the coil 3B interposed therebetween to form a voice coil motor 20B. Furthermore, they are arranged so as to be arranged at right angles in the form of a voice coil motor.
[0011]
As shown in the cross-sectional view showing the periphery of the guide in FIG. 3, here, a force acts in the X direction by the voice coil motor to move the blur correction lens 1. The rack 2a formed in the gear 10 and the mirror chamber 2 is engaged with each other, and the tooth surface just acts as a keyway. Therefore, the vibration reduction lens 1 slides in the X direction and guides the movement in the X direction. .
[0012]
Further, when a force is applied in the Y direction by the voice coil motor to move the blur correction lens 1, the gear 10 is rotated together with the gear shaft 8, so that the blur correction lens 1 is sent out in the Y direction and moved in the Y direction. To guide.
[0013]
Although the description has been made so that the force of the voice coil motor works along the guide direction, even if a force is applied in the middle direction between the X axis and the Y axis, the force is decomposed into XY components by the guide. The correction lens 1 does not rotate in the optical axis direction. In other words, even if a force is applied in the middle of the X axis and the Y axis, the gear 10 slides along the tooth surface in the X axis direction and rotates in the Y axis direction to feed out the vibration reduction lens 1. As a result, the input direction of the voice coil motor is shifted.
[0014]
As shown in the cross-sectional view around the position detection element in FIG. 4, the movement of the blur correction lens 1 is detected by the light emitting element 11 attached to the mirror chamber 2 and the light receiving element 13 attached to the electronic substrate 12. Are controlled by a CPU (not shown).
[0015]
In this embodiment, the first driving force generator that drives in the first direction and the second driving force that drives the correction lens in the second direction perpendicular to the first direction. The generator is described with a voice coil motor.
[0016]
As described in the operation, the gear shaft 8 may be used as a guide instead of using the tooth surface of the gear 10 as a guide.
[0017]
Further, although the gear shaft 8 is disposed at a position of 45 degrees with respect to the coils 3A and 3B, since only one shaft is sufficient, it may be disposed anywhere.
[0018]
In the present embodiment, a description has been given of a configuration in which a rack is provided in the lens barrel 2 and the gear shaft 8 and the gear shaft base 9 are disposed in the main body 4. However, a rack is provided in the main body 4, and the gear shaft 8 and the gear shaft base 9 are provided. The lens barrel 2 may be disposed.
[0019]
【The invention's effect】
As described above, according to the configuration of the present invention, the guide is performed by the rotation of the gear and the sliding of the tooth surface or the gear shaft. For this reason, since the space where a pair of guides is usually required is the same space as one guide, the apparatus is made compact. In addition, there are less restrictions on the arrangement of the guides, and there is a degree of freedom in design, for example, a position detection element that detects the movement of the vibration reduction lens and a roller that restricts the lens in the optical axis direction. Come out.
[Brief description of the drawings]
FIG. 1 is a plan view showing a portion of a shake correction apparatus according to an embodiment of the present invention.
2 is a cross-sectional view taken along the line AA of FIG. 1 showing the periphery of the voice coil motor.
3 is a cross-sectional view taken along the line BB in FIG. 1 showing the periphery of the guide.
4 is a cross-sectional view taken along the line CC of FIG. 1 showing the periphery of the position detection element.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shake correction lens 2 Mirror chamber 2a Rack 3a Coil 3b Coil 4 Main body 5 Magnet 6 Yoke 7 Roller 8 Gear shaft 9 Gear shaft base 10 Gear 11 Light emitting element 12 Electronic substrate 13 Light receiving element 20 Voice coil motor

Claims (1)

A correction lens that corrects blur, a mirror chamber that holds the correction lens, a first driving force generator that drives the correction lens in a first direction on a plane substantially perpendicular to the optical axis, and a first direction And a second driving force generator for driving the correction lens in a second direction perpendicular to the optical axis, the mirror chamber around the optical axis on a plane substantially perpendicular to the optical axis A blur correction device characterized in that the rotation is controlled by a gear.

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