Disk Device Carriage Arm Frequency Mode Damping
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Solution Overview
Problem
Small, high-integration hard disc devices face challenges in enhancing operational shock resistance due to limited ability to increase resonance frequencies, necessitating improved methods to suppress arm swings during short-duration shocks.
Innovation Solution
The carriage design incorporates a configuration with a top arm, bottom arm, and mid arm, featuring specific frequency modes and damping effects, where the top and bottom arms swing in opposite phases to the mid arm, utilizing adjustments in shape, thickness, weight distribution, and material to achieve a damping effect that suppresses arm swings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the disc device is made thinner and lighter to achieve small high-integration, then the device size and weight are reduced, but the ability to enhance resonance frequencies of the base and arms is limited
Solution Approach 1:
The invention changes the dynamic parameters of the arm member by creating specific mode frequency relationships. The third mode frequency is set to be within 50 Hz of the second mode frequency, creating a parameter configuration that generates destructive interference for shock vibrations. This parameter change allows the thinner, lighter device to achieve improved shock resistance without increasing mass or dimension.
Solution Approach 2:
The invention utilizes mechanical vibration principles by creating a specific resonance frequency relationship between different arm modes. When shock occurs, the second and third modes are excited with frequencies close to each other, creating vibration patterns that result in reduced overall arm swing. This vibrational approach converts the physical constraints into a beneficial dynamic characteristic.
2Reliability
If the resonance frequencies of the arms are increased to improve operational shock resistance, then the shock resistance is enhanced, but the device complexity increases
Solution Approach 1:
Instead of increasing device complexity through additional components or structures, the invention changes the physical parameters of the existing arm member - specifically the distribution of thickness, material density, and geometric shape - to achieve the desired frequency relationship. This parameter-based approach maintains structural simplicity while achieving improved shock resistance.
3Reliability
If the arms are designed with higher resonance frequencies to suppress swings during shock, then the operational shock resistance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The invention uses parameter changes in the arm member geometry - such as varying thickness distribution and material properties - that create a robust frequency relationship. The requirement that the third mode frequency be within 50 Hz of the second mode frequency provides a clear manufacturing target that can be achieved through standard precision techniques, avoiding excessively tight tolerances.
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
This configuration enhances operational shock resistance by generating a sub-mode that dampens the swings of the top and bottom arms, effectively improving the disc device's resistance to shocks through controlled frequency responses and suspension orientations.
Implementation Method 1
The top, bottom, and mid arms of the arm member have their appropriate modes (resonance frequencies). The arms swing when a shock is applied to the carriage.
Implementation Method 2
The top, bottom, and mid arms of the arm member have their appropriate modes (resonance frequencies).
Implementation Method 3
an end arm mode in which the top and bottom arms swing at a second frequency higher than the first frequency within opposite phases and with an amplitude larger than that of the mid arm
Data Source
AI summary
A carriage for a disc device, which has a top arm, bottom arm, and mid arm, has a main mode, end arm mode, and mid arm mode as a frequency response obtained when subjected to a vertical shake. In the main mode, all of the top, bottom, and mid arms swing at a first frequency within the same phase in a primary bending mode. In an end arm mode, the top and bottom arms swing at a second frequency higher than the first frequency within opposite phases and with an amplitude larger than that of the mid arm. In the mid arm mode, the mid arm swings at a third frequency having a difference of 50 Hz or less from the second frequency within the same phase as in the main mode, and the top and bottom arms swing within the phase opposite from that in the main mode.