CN-122003630-A - Optical element driving device, camera module, and camera mounting device

Abstract

The optical element driving device includes a movable unit, a driving unit that includes an ultrasonic motor that includes a laminate in which a plurality of piezoelectric elements are laminated, and drives the movable unit in a predetermined direction, and a shaft portion that extends in the predetermined direction and is disposed opposite the laminate, and the driving unit includes two contact portions that are in contact with the laminate and the shaft portion and are disposed on the laminate so as to sandwich the shaft portion.

Inventors

• KAIBARA SHOKICHI
• UJIIE HIROYUKI
• OSAKA TOMOHIKO
• TAKANASHI RYO
• Kumagai kyogo

Assignees

• 三美电机株式会社

Dates

Publication Date

20260508

Application Date

20241206

Priority Date

20231228

Claims (13)

1. 1. An optical element driving device is characterized by comprising: A movable section that houses an optical element; A driving part having an ultrasonic motor including a laminate in which a plurality of plate-like elements including piezoelectric elements are laminated, and driving the movable part in a predetermined direction A shaft portion extending in the predetermined direction and disposed so as to face the laminate, The driving section has two contact sections that are in contact with the laminated body and the shaft section and are disposed on the laminated body so as to sandwich the shaft section.
2. 2. The optical element driving apparatus according to claim 1, wherein, The contact portion group formed by the two contact portions is arranged in plural in the predetermined direction.
3. 3. The optical element driving apparatus according to claim 1, wherein, The laminated body has a receiving portion for receiving the contact portion at a portion facing the shaft portion.
4. 4. An optical element driving apparatus according to claim 3, wherein, Through holes are formed in at least the surface layer of the laminate, At least a part of the receiving portion is a space portion of the through hole.
5. 5. The optical element driving apparatus according to claim 4, wherein, The laminate includes a first piezoelectric element having the through hole and a second piezoelectric element including an electrode portion.
6. 6. The optical element driving apparatus according to claim 1, wherein, The contact surface of the contact portion with the shaft portion is formed in a spherical shape.
7. 7. The optical element driving apparatus according to claim 1, wherein, The rolling part is configured to sandwich the shaft part between the rolling part and the contact part.
8. 8. The optical element driving apparatus according to claim 7, wherein, The device further comprises a guide part for guiding the rolling of the rolling part.
9. 9. The optical element driving device according to claim 8, wherein, The rolling part is provided with a plurality of ball parts, The guide portion of the plurality of ball members of the guide portion includes a region where the ball members face the shaft portion, and is configured to roll around the plurality of ball members.
10. 10. The optical element driving device according to claim 9, wherein, The guide portion includes a partition portion configured to partition a region in which the ball member faces the shaft portion and a region in which the ball member does not face the shaft portion.
11. 11. The optical element driving apparatus according to claim 7, wherein, The surface of the shaft portion facing the contact portion is flat, The surface of the shaft portion facing the rolling portion is formed in an arc shape.
12. 12. A camera module, comprising: The optical element driving device of claim 1; an element part including an optical element held by the movable part, and And an imaging unit that images the object image formed by the element unit.
13. 13. A camera mounting apparatus is an information device or a transport device, and is characterized by comprising: the camera module of claim 12, and And a shooting control part for processing the image information obtained by the camera module.

Description

Optical element driving device, camera module, and camera mounting device Technical Field The present invention relates to an optical element driving device, a camera module, and a camera mounting device. Background Conventionally, a camera module mounted on a thin camera mounting device such as a smart phone is known. Such a camera module is known to include an optical element driving device having a zoom function for enlarging or reducing an object image. For example, patent document 1 discloses a structure including a fixed lens into which light from an object is incident, two movable lenses into which light bent by the fixed lens is incident, and a lens driving unit for moving the two movable lenses in the direction of the optical axis. In addition, from the viewpoint of downsizing of the optical element driving device, an ultrasonic motor including a piezoelectric element is being studied as a driving source of a movable lens. Among ultrasonic motors, for example, a composite resonance type ultrasonic motor in which a plurality of piezoelectric elements are laminated is known (for example, refer to patent document 2). Such an ultrasonic motor can move the movable lens by generating two resonances (buckling resonance and telescopic resonance) at the same time. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2018-36416 Patent document 2 Japanese patent application laid-open No. 2011-186073 Disclosure of Invention Problems to be solved by the invention However, in such an ultrasonic motor, a portion that receives vibration of the ultrasonic motor is required on the optical element driving device side. Therefore, a structure is desired in which the portion receiving the vibration and the ultrasonic motor are stably brought into contact. The invention aims to provide an optical element driving device, a camera module and a camera mounting device, wherein the optical element driving device can enable an ultrasonic motor and a part receiving vibration of the ultrasonic motor to be stably contacted. Means for solving the problems An optical element driving device includes a movable section that houses an optical element, a driving section that includes an ultrasonic motor that includes a laminate in which a plurality of plate-like elements including piezoelectric elements are laminated, and a shaft section that extends in the predetermined direction and is disposed so as to face the laminate, The driving section has two contact sections that are in contact with the laminated body and the shaft section and are disposed on the laminated body so as to sandwich the shaft section. The camera module of the present invention includes the optical element driving device, an element section including an optical element held by the movable section, and an imaging section that images an object image imaged by the element section. The camera mounting device of the present invention is a camera mounting device as an information device or a conveying device, and includes the camera module, and a shooting control unit for processing image information obtained by the camera module. Effects of the invention According to the present invention, the ultrasonic motor and the portion receiving the vibration of the ultrasonic motor can be brought into stable contact. Drawings Fig. 1A is a diagram showing a smart phone having a camera module mounted thereon. Fig. 1B is a diagram showing a smart phone mounted with a camera module. Fig. 2 is a view schematically showing a camera module according to a first embodiment of the present invention. Fig. 3 is a diagram schematically showing the structure of the camera module according to the first embodiment in a side view. Fig. 4 is a perspective view showing a portion of the driving portion and the shaft portion. Fig. 5 is a perspective view showing a part of the driving section. Fig. 6 is a cross-sectional view of a contact portion of the driving portion and the shaft portion. Fig. 7 is a view of the contact portion and the shaft portion from the X-direction side. Fig. 8 is a perspective view of a housing portion provided in the camera module of the second embodiment. Fig. 9 is an exploded perspective view of the housing portion. Fig. 10A is a perspective view showing a pressing portion of the urging portion. Fig. 10B is a view showing a contact portion between the pressing portion and the ultrasonic motor. Fig. 11 is a cross-sectional view showing a contact portion between the shaft portion and the rolling portion. Fig. 12 is a view showing the guide holding portion. Fig. 13 is a view showing a holding portion of the rolling portion of the guide holding portion. Fig. 14 is a view showing the guide support portion. Fig. 15 is a diagram for explaining the operation of the second embodiment. Fig. 16 is a diagram showing a shaft portion according to a modification. Fig. 17A is a diagram showing an automobile mounted with a camera module. Fig.