JP2005181463A - Device for attaching image fluctuation sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical fluctuation preventive device equipped with an image fluctuation detection sensor so as to remove harmful vibration except for hand shake. <P>SOLUTION: The optical fluctuation preventive device absorbs high frequency vibration transmitted to a rigid substrate 11 with a hanging rubber 10 and prevents fluctuation from being propagated with a gyro sensor 3 by adhering a gyro substrate 6 attaching the gyro sensor 3 through a plurality of the hanging rubbers 10 to the rigid substrate 11. Furthermore, the harmful vibration transmitted to a fixed side holding cylinder 2 is attenuated with a support roller 14 and a depressing roller 18 to be removed with a rubber washer A15 and a rubber washer B16, and prevented from being transmitted to the rigid substrate 11. In addition, flexion produced in an intermediate of the rigid substrate 11 is prevented by sandwiching and supporting a rubber spacer 17 at the intermediate position of the rigid substrate 11, and the harmful vibration from the holding cylinder 2 is prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical image stabilizer, and more particularly to an image shake sensor mounting device for detecting vibration and executing an image shake correction operation.

  Conventionally, various devices for correcting image blur due to camera shake have been proposed, and a mechanism for moving a part of the correction lenses constituting the photographing lens in a direction perpendicular to the optical axis is, for example, an image blur in a camera. There has been proposed an image stabilization device that predicts image blur by detecting the camera shake acceleration that is the cause, and moves the lens in a perpendicular direction based on the prediction signal, thereby suppressing the image blur.

  The detection means for detecting the camera shake employs a method based on a detection means for detecting a signal generated in two vibration gyros arranged at right angles to the vertical and horizontal rotational shakes generated in the camera or the lens. A shake detection means that only has a vibration gyro is used to cause malfunctions due to harmful vibrations other than camera shake, such as shock vibration caused by mirror operation of single-lens reflex cameras and vibration during shutter and diaphragm operation. There was a thing.

There have already been applications for mounting devices for shake detection sensors for removing these harmful vibrations. For example, there have been applications for a device for attaching a shake detection sensor using a plurality of rubber bushes, a device for attaching a shake detection sensor via an elastic sheet or a flexible printed board, and the like.
Japanese Patent Laid-Open No. 02-170058 JP 05-107623 A

  The problem to be solved is that the mounting device that only absorbs vibration as in the above-described conventional example, the rigidity in the detection direction of the vibration gyro is weakened. Has the disadvantage of becoming complicated.

  The present invention makes it possible to use an elastic member excellent in absorbing harmful vibrations, and in order to maintain the shake detection capability, a gyro substrate to which a gyro sensor is attached is temporarily attached to a rigid substrate with elasticity through an elastic rubber, Furthermore, in order to prevent harmful vibrations from the mounting body, the rigid substrate is fixed in such a manner that the two positions at both ends of the rigid substrate are sandwiched by elastic rubber washers, and the middle is supported by sandwiching an elastic spacer. The solution was made with a heavy structure.

  The image shake sensor mounting device is effective in removing harmful vibrations without impairing the original shake detection capability.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of one embodiment of the mounting device of the present invention, FIG. 2 is a plan view of the mounting state, and FIG. 3 is a lens barrel showing the position of an image shake sensor installed in the lens barrel. It is sectional drawing.

  An image stabilization device is a suitable place to detect the amount of camera shake against camera shake caused by external factors transmitted to the photographer or the photographer when the photographer holds the camera with a lens barrel attached to the camera and takes a picture. A sensor is installed in the lens barrel, and the most effective lens in the lens group of the lens barrel is moved according to the signal from the sensor in a direction approximately perpendicular to the optical axis to compensate for the direction and amount of camera shake. This is a device that corrects image blur on the lens focal plane.

  However, as shown in FIG. 2, the camera shake sensor has two gyro sensors 3 arranged at right angles to the same plane, and a signal is generated by the acceleration received by each, and the direction and amount of the camera shake are generated by these two signals. For example, in a zoom lens composed of a 7-group lens shown in FIG. 3, the gyro sensor 3 is close to the camera mounting mount 5 and is in the optimum position shown in FIG. It is necessary to detect the direction and amount by the signal from the gyro sensor 3 by the camera shake obtained here, and the correction lens 4 of the third lens group G3 in the lens group is required to be approximately perpendicular to the optical axis 1. It is effective to prevent camera shake by moving it by an appropriate amount.

  As shown in FIG. 3, it is essential that the gyro sensor 3 is installed in a position that is close to the mount 5 to be attached to the camera, although it is essential that the original camera shake vibration can be detected faithfully. This is a position where sound and vibration such as the impact of mirror operation, shutter operation, etc. are easily transmitted, especially close to the installation location of drive motors for lens focus adjustment and aperture adjustment. Yes, each is susceptible to harmful vibration during driving.

  For this reason, the device attached to the lens barrel body of the gyro sensor 3 can faithfully sense a relatively low frequency effective vibration of 1 Hz to 12 Hz which is a hand vibration, and is harmful to a frequency higher than the relatively effective vibration including the noise of the operation. It must be an installation device that can remove vibrations.

  The present solution solved from this viewpoint will be described with reference to FIG. 2 which is an installation plan view of the gyro sensor 3 and FIG. 1 which is a partial cross-sectional view of the gyro sensor 3. 8 is packaged in a sensor case 9 and is installed at right angles to the lower plane of the gyro substrate 6 which is a printed circuit board so that the sensor case 9 can be attached together. The upper surface of the gyro sensor 3 A flexible printed circuit board 7 is attached to take out signals from the four terminals 3 ′ and connect them to a circuit that can be operated.

  A gyro substrate 6 to which a flexible printed circuit board 7 on which the gyro sensor 3 is mounted is attached to an arc-shaped rigid substrate 11 made of a metal plate such as an iron plate via a plurality of suspension rubbers 10, and two gyro sensors 3 and A gyro substrate 6 including a flexible printed circuit board 7 is suspended in a state of being suspended from a rigid substrate 11. This exhibits the effect of absorbing the high-frequency vibration transmitted to the rigid substrate 11 by the hanging rubber 10 and preventing it from propagating by the gyro sensor 3.

  As shown in FIG. 2, holes 11 ′ are machined in two places on both ends of the rigid substrate 11, and screwed into attachment holes A <b> 2 a of two screw holes of the holding cylinder 2 that is a fixing portion of the lens barrel. The rigid substrate 11 is fixed to two standing pillars A12 with two holding screws 19 through holes 11 '. As shown in the sectional view of FIG. 1, a plastic support is provided at the center of the pillar A12. The roller 14 is inserted, and the rigid substrate 11 is sandwiched between the rubber washer A15 and the rubber washer B16, which are elastic bodies. The center of the pressing roller 18 is formed with a hole in the center and the center protruding as shown in the figure. Is inserted into the hole 11 ′ of the rigid substrate 11, and is screwed into the center screw portion of the column A 12 so as to press the support roller 14 through the center hole of the holding roller 18 with the holding screw 19 from above. Ri are marked.

  By doing so, since the rigid substrate 11 does not directly contact the support column A12 and the holding screw 19, harmful vibration transmitted to the holding cylinder 2 on the fixed side is transmitted to the support column A12. It is attenuated and further removed by the rubber washer A15 and the rubber washer B16 to prevent it from being transmitted to the rigid substrate 11.

  In addition, when a large impact is applied to the lens barrel, the rigid substrate 11 is rigidly fixed to prevent both ends of the rigid substrate 11 from being bent in the middle of the rigid substrate 11 and harmful vibrations from the holding tube 2. A support roller 14 is inserted in the center by a column B13 which is screwed into a mounting hole B2b of a screw hole in the holding cylinder 2 at an intermediate position of the substrate 11, and further supported with a rubber spacer 17 interposed therebetween. ing.

  The gyro sensor 3 with respect to the effective image shake vibration among the vibrations received by the lens barrel by the image shake sensor mounting device disposed on the holding cylinder 2 on the fixed side of the lens barrel having the above-described configuration, The image vibration is transmitted to the rigid substrate 11 through the column B13, and further to the gyro substrate 6 including the flexible printed circuit board 7 on which the gyro sensor 3 is mounted through the suspension rubber 10 suspended from the rigid substrate 11. First, the rigid substrate 11 is first supported by the support roller 14, the pressing roller 18, the rubber washer A15, the rubber washer B16, and the rubber spacer 17 from the support column A12 and the support column B13. Protect, but the harmful vibrations that are not removed from the rigid substrate 11 Completely absorbed by Chakugomu 10, it is impossible transmitted to the gyro substrate 6. Since the vibration-proof double structure is thus provided, it is possible to install the gyro sensor 3 that protects the gyro sensor 3 from harmful vibration and can detect only effective image vibration.

  The present invention can be applied to a device that requires vibration isolation in industry, and is particularly suitable for a device that seeks an effect of following vibration for low frequency vibration and blocking vibration for high frequency vibration.

It is sectional drawing of one Example of the attachment apparatus of this invention. It is a top view of the attachment state of this invention. It is a lens barrel sectional view showing the position of an image blur sensor installed in a lens barrel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical axis 2 Holding cylinder 3 Gyro sensor 4 Correction lens 5 Mount 6 Gyro substrate 7 Flexible printed circuit board 8 Protection sheet 9 Sensor case 10 Suspension rubber 11 Rigid substrate 12 Prop A
13 Prop B
14 Support roller 15 Rubber washer A
16 Rubber washer B
17 Rubber spacer 18 Pressing roller 19 Pressing screw

Claims (1)

  In a vibration detecting means that is installed in a fixed part in the lens barrel and has two image shake detection sensors arranged at right angles on the substrate for detecting vibration applied to the lens barrel, the substrate is elastically In a form in which an elastic spacer is sandwiched between the two fixed portion attachment means and the rigid substrate that are attached to the rigid substrate made of metal through a member, and attached to the rigid substrate in a form that is held by elastic rubber. An apparatus for attaching an image shake sensor, characterized by comprising means for supporting.

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