Actuator Power Feeding Circuit Board Side Mounting
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Solution Overview
Problem
Existing actuators with fixed power feeding circuit boards protrude from the case, increasing the outside dimension and complicating assembly due to potential disconnection of coil wires during assembly.
Innovation Solution
An actuator design featuring a power feeding circuit board fixed to the coil holder with a retracted side face, incorporating a slack portion for the coil wire, which is adhesive-fixed to prevent disconnection and minimize protrusion, allowing for reduced overall dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power feeding circuit board is fixed to the case so as to protrude from the case, then the circuit board can be securely mounted and connected, but the outside dimension of the actuator is increased
Solution Approach 1:
The power feeding circuit board is rotated 90 degrees relative to the coil holder, changing its orientation from a protruding configuration to a side-mounted configuration. This dimensional reorientation allows the circuit board to be securely fixed to the side surface of the coil holder without increasing the actuator's length in the vibration direction, thus resolving the contradiction between mounting reliability and compact outside dimensions
Solution Approach 2:
Instead of making the circuit board protrude from the end face of the coil holder, the invention inverts the mounting approach by fixing the circuit board to the side surface of the coil holder. This inverted configuration maintains secure mounting while eliminating the protrusion that would increase the actuator's outside dimension
2Ease of manufacture
If the coil wire is connected directly without slack portion, then the assembly process is simpler, but the coil wire is easily disconnected during assembly
Solution Approach 1:
A slack portion is intentionally provided in the coil wire before connection to the power feeding circuit board. This pre-built slack acts as a cushion that prevents excessive tension and potential disconnection during the assembly process, thereby improving connection reliability without significantly complicating the manufacturing procedure
3Device complexity
If the power feeding circuit board is fixed with the end face aligned with the coil holder end face, then the structure is simpler, but the solder and adhesive greatly protrude from the end face
Solution Approach 1:
The power feeding circuit board is oriented perpendicular to the coil holder's main axis, mounting it on the side surface rather than the end face. This dimensional change in orientation prevents solder and adhesive from protruding significantly from the end face, achieving a cleaner appearance without substantially increasing structural complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces the outside dimensions of the actuator while enhancing assembly reliability by preventing coil wire disconnection and minimizing adhesive protrusion, thus improving the actuator's compactness and assembly efficiency.
Implementation Method 1
a magnetic drive circuit including a coil provided in one side member which is one of the movable body and the support body, and a permanent magnet provided in the other side member which is the other of the movable body and the support body so as to face the coil in a first direction, and structured to vibrate the movable body with respect to the support body in a second direction intersecting the first direction
Implementation Method 2
the slack portion may be fixed to the one side face with an adhesive
Data Source
AI summary
An actuator may include a movable body, a support body, a connection body having at least one of elasticity and viscoelasticity, and a magnetic drive circuit having a coil provided in one side member of the movable body and the support body, and a permanent magnet provided in the other side member to vibrate the movable body. The one side member may include a coil holder and a power feeding circuit board fixed to the coil holder in a state that one side face of the circuit board faces an outer side, and the one side face may have a land connected with a coil wire structuring the coil. The circuit board may be fixed to the coil holder in a state that the one side face is retracted from an end face of the coil holder, and the coil wire may have a slack portion fixed to the one side face.