Magnetic Card Bit Density Control via Stepper Motor Pulse Synchronization
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Solution Overview
Problem
Traditional methods for controlling bit density on magnetic cards are inflexible, unable to adjust bit density once the photoelectric encoder is selected, and can only control one track, limiting their application, especially for industrial users with varying data volume and confidentiality needs.
Innovation Solution
A device and method utilizing a stepper motor to adjust the frequency of the driving pulse signal, allowing for flexible bit density control by synchronizing the movement of the magnetic card or recording head with the stepper motor's pulse, enabling multiple bit densities on multiple tracks without increasing hardware costs by omitting the need for a photoelectric encoder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photoelectric encoder is used to detect magnetic card displacement, then bit density control is achieved, but the device complexity increases and bit density cannot be adjusted after selection
Solution Approach 1:
The patent replaces the photoelectric encoder (optical measurement system) with a stepper motor (mechanical positioning system). The stepper motor's pulse output directly controls the magnetic card movement, eliminating the need for complex optical detection while maintaining precise bit density control. This substitution reduces device complexity and enables flexible bit density adjustment through software control of pulse frequency.
Solution Approach 2:
The patent introduces dynamic adjustability to the bit density control system. By using a stepper motor with variable pulse frequency, the system can dynamically change bit density parameters during operation without hardware reconfiguration. This dynamic capability allows the same device to adapt to different bit density requirements (e.g., 210 bpi, 75 bpi, or custom values) by simply adjusting the pulse generation frequency.
2Adaptability or versatility
If a photoelectric encoder is used for bit density control, then single-track control is achieved, but multi-track control with different bit densities becomes difficult
Solution Approach 1:
The patent makes the stepper motor system universal by enabling it to control multiple tracks with different bit densities using the same hardware platform. Each track can be independently controlled by adjusting the pulse frequency and pattern, allowing the system to accommodate various bit density requirements (e.g., high-density tracks for confidential data, standard-density tracks for general data) without adding separate control mechanisms for each track.
3Quantity of substance
If standard bit densities (210 bpi, 75 bpi) are used, then universality is maintained, but data volume and confidentiality requirements of industrial users are not met
Solution Approach 1:
The patent enables continuous parameter adjustment of bit density by changing the stepper motor pulse frequency. Users can select from standard bit densities (210 bpi, 75 bpi) or customize any intermediate bit density value by adjusting the pulse generation parameters. This parameter flexibility allows the system to optimize data volume for specific industrial applications while maintaining compatibility with existing magnetic card standards.
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
Enables flexible adjustment of bit density according to requirements, supporting multiple bit densities on multiple tracks without hardware cost increases, enhancing data recording capacity and meeting industrial demands for larger data volumes and confidentiality.
Implementation Method 1
utilizing a stepper motor to adjust the frequency of the driving pulse signal, allowing for flexible bit density control by synchronizing the movement of the magnetic card or recording head with the stepper motor's pulse
Implementation Method 2
Once the coil of the magnetic head is electrified, an magnetic field, which is in linear proportion to the current, is generated in the gap. The magnetic body of the part of the magnetic card which is in contact with the gap is are magnetized.
Data Source
AI summary
A device and a method for controlling a bit density of a magnetic card (2) are provided. Said control device comprises a stepper motor (1) providing power to drive the magnetic card (2) or a recording magnetic head (15), a transmission mechanism transferring power to the magnetic card (2) or the recording magnetic head (15), a CPU (10) sending magnetic recording information, a track data encoder (13) receiving a magnetic writing pulse signal (CLK1) and generating magnetic writing data in synchronization with the magnetic writing pulse signal (CLK1), and a magnetic head driving circuit (14) outputting a magnetic writing control signal based on the magnetic writing data. The frequency of the magnetic writing pulse signal (CLK1) and the frequency of a driving pulse signal (CLK0) of the stepper motor are in a linear relationship. Said control method is a method for controlling a bit density.