Vibration motor and lens drive mechanism

Abstract

The present invention provides a vibrating motor and a lens driving mechanism. The vibrating motor can press the vibrating body toward the driving body side in a stable state, thereby improving the driving efficiency. The lens driving mechanism uses the vibrating motor so that it can effectively use The lens moves. In order to achieve this object, the following vibrating motor is adopted, which vibrates the vibrating body, and presses the vibrating body on the driven body, so as to transmit the vibration of the vibrating body as a driving force, and is characterized in that it has: a vibrating body, which On the side of one end side, there is a protruding output part, and the output part is arranged in contact with the driven body; the pressing mechanism, on the side of the other end side of the vibrating body, is pressed to the driven body side The vibrating body, and the pressurizing mechanism is provided with a pressurizing correction part rotatably provided at the contact position between it and the vibrating body, and the pressurizing mechanism presses the vibrating body to a predetermined direction through the pressurizing correcting part. Apply pressure in the direction.

Description

technical field [0001] The invention relates to a vibrating motor and a lens driving mechanism. The vibrating motor vibrates a vibrating body, and presses the vibrating body on a driven body, thereby transmitting the vibration of the vibrating body as a driving force. The lens driving mechanism The lens is moved in the optical axis direction using the vibration motor. Background technique [0002] One of the driving sources of various devices including a movable mechanism is a vibration motor. The vibration motor vibrates the vibrating body with the output part, thereby generating an elliptical rotational motion on the output part. By pressing the output part on the driven body, the friction force between the two drives Deliver momentum. Among vibration motors, ultrasonic motors can achieve low speed and high torque, are excellent in quietness, and are suitable for small size and light weight, so they are used for, for example, the autofocus function of cameras, scanning e...

AI Technical Summary

Problems solved by technology

In particular, in the case of a lens drive mechanism, etc., due to the limitation of the installation position, when the pressurizing mechanism of the vibration motor cannot be arranged on the same straight line as the contact portion between the driven body 200 and the output part 101, The pressing force from the pressing mechanism tends to become unstable

[0007] In addition, in the case of an ultrasonic motor, since the piezoelectric element used as a vibrating body has hysteresis between the applied voltage and the displacement amount, the positional relationship between the pressurizing mechanism and the vibrating body assumed in a static state sometimes slightly off

As a result, there is a problem that the force acting from the pressing mechanism to the vibrating body is dispersed, and the pressing cannot be performed in an optimal state, thereby reducing the driving efficiency. Therefore, further improvement is required.

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