Electromagnetic driving module and camera device using the same

• US 9,989,726 B2
• Filed: 10/17/2016
• Issued: 06/05/2018
• Est. Priority Date: 11/23/2015
• Status: Active Grant

• Current Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Original Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Inventors: Huang, Shih-Ting, Liao, Yu-Huai, Chan, Yi-Liang, Moto, Ichitai
• Primary Examiner(s): PINKNEY, DAWAYNE
• Application Number:
  US15/295,374
• Publication Number:
  US 20170146769A1
• Time in Patent Office: 596 Days
• Field of Search: 359697-698, 359694, 359808, 359811-830
• CPC Class Codes: G02B 7/04 with mechanism for focusing or varying magnification
• CPC Class Codes: G03B 2205/0069 using electromagnetic actuators, e.g. voice coils
• CPC Class Codes: G03B 3/10 Power-operated focusing
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing
• CPC Class Codes: H01F 2007/062 Details of terminals or connectors for electromagnets
• CPC Class Codes: H01F 2007/068 using printed circuit coils
• CPC Class Codes: H01F 7/064 Circuit arrangements for actuating electromagnets circuit arrangements for obtaining special operating characteristics H01F7/18; driving circuits for electromagnets making use of a switching regulator H01H47/325
• CPC Class Codes: H01F 7/08 with armatures
• CPC Class Codes: H01H 2219/066 Lens
• CPC Class Codes: H01H 50/021 structurally combining a relay and an electronic component, e.g. varistor, RC circuit auxiliary switch inserting resistor during closure H01H50/543

Abstract

An electromagnetic driving device is provided, which includes a movable member, a stationary member, a driving magnet, a driving coil, a conductive layer, and an external terminal. The movable member and the stationary member are arranged separate from each other along a main axis. The driving magnet is positioned on the movable member. The driving coils are arranged corresponding to the driving magnet and are disposed in the stationary member. The conductive layer is electrically connected to the driving coils and is disposed in the stationary member. The external terminal is exposed by the fixed member and electrically connected to the conductive layer. The thickness of the external terminal is different from the thickness of the conductive layer.

Claims

1. An electromagnetic driving assembly, comprising:

a movable member;

a fixed member spaced apart from the movable member, wherein the movable member and the fixed member are arranged along a main axis;

a driving magnet disposed on the movable member;

a driving coil formed in the fixed member and arranged to correspond to the driving magnet;

a conductive layer formed in the fixed member and electrically connected to the driving coil; and

a terminal exposed by the fixed member and electrically connected to conductive layer, wherein the thickness of the terminal is different from the thickness of the conductive layer, and the driving coil, the conductive layer and the terminal are embedded in the fixed member.

2. The electromagnetic driving assembly as claimed in claim 1, wherein the thickness of the terminal in a direction that is perpendicular to the main axis is greater than the thickness of the conductive layer in a direction that is parallel to the main axis.

3. The electromagnetic driving assembly as claimed in claim 1, wherein the fixed member comprises:

a coil substrate, wherein the driving coil is positioned in the coil substrate; and

a lower substrate, wherein the conductive layer is positioned in the lower substrate and arranged at a position that is near the coil substrate, and the terminal is exposed by the lower substrate.

4. The electromagnetic driving assembly as claimed in claim 1, wherein the fixed member comprises:

a coil substrate, wherein the driving coil is positioned in the coil substrate; and

a lower substrate, wherein the conductive layer is positioned in the lower substrate, and the terminal is exposed by the lower substrate, wherein a bottom surface of the coil substrate and a top surface of the lower substrate are formed integrally.

5. The electromagnetic driving assembly as claimed in claim 4, wherein the coil substrate and the lower substrate are made of the same material.

6. The electromagnetic driving assembly as claimed in claim 1, wherein the fixed member comprises a plurality of insulation layers, and the conductive layer is sandwiched between the insulation layers.

7. The electromagnetic driving assembly as claimed in claim 1, further comprising a position sensor, wherein the position sensor is disposed underneath a top surface of the fixed member, or the position sensor is flush with the top surface of the fixed member.

8. The electromagnetic driving assembly as claimed in claim 7, wherein a positioning recess is formed on the top surface of the fixed member, and the position sensor is disposed in the positioning recess.

9. The electromagnetic driving assembly as claimed in claim 1, further comprising a wire connecting the fixed member to the movable member, and a connected recess is formed on the top surface of the fixed member, wherein one end of the wire is fixed in the connected recess.

10. The electromagnetic driving assembly as claimed in claim 1, wherein a projection of the driving coil in a direction that is parallel to the main axis is located outside of the conductive layer.

11. The electromagnetic driving assembly as claimed in claim 1, wherein the fixed member comprises an extending portion extending in a direction that is parallel to the main axis, wherein the terminal is exposed by a lateral surface of the extending portion away from the main axis and is covered by a lateral surface of the extending portion near the main axis.

12. A camera device, comprising:

an electromagnetic driving assembly comprising;

a movable member;

a fixed member spaced apart from the movable member, wherein the movable member and the fixed member are arranged along a main axis;

a driving magnet disposed on the movable member;

a driving coil formed in the fixed member and arranged to correspond to the driving magnet;

a conductive layer formed in the fixed member and electrically connected to the driving coil; and

a terminal exposed by the fixed member and electrically connected to conductive layer, wherein the thickness of the terminal is different from the thickness of the conductive layer, and the driving coil, the conductive layer and the terminal are embedded in the fixed member; and

a lens assembly positioned in the movable member, wherein the optical axis of the lens assembly is aligned with the main axis.