Optical Disc Drive Noise Reduction via Buffer-Controlled Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical disc drive devices produce significant noise when rotating high-capacity optical discs like UHD BD-ROMs, and conventional noise reduction methods increase costs by adding parts.
Innovation Solution
The optical disc drive device controls the rotational speed of the disc based on free space information from the buffer, adjusting the speed to reduce noise without increasing the number of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational speed of the optical disc is increased to support high-speed playback, then productivity is improved, but noise increases
Solution Approach 1:
The patent applies dynamics by making the rotational speed adjustable rather than fixed. The drive controller dynamically changes the rotational speed based on buffer status, transitioning between high speed (for fast data transfer) and low speed (for noise reduction when buffer is sufficient). This resolves the contradiction by allowing the system to adapt speed to actual needs rather than maintaining constant high speed.
Solution Approach 2:
The patent changes the rotational speed parameter based on buffer free space conditions. When buffer free space exceeds a threshold, the rotational speed is reduced from high-speed mode to low-speed mode, directly addressing the noise issue while maintaining data transfer capability through buffer management.
2Object-generated harmful factors
If the rotational speed is decreased to reduce noise, then harmful factors are reduced, but data transfer rate decreases
Solution Approach 1:
The buffer serves as an intermediary between the optical disc and the signal processing device. It decouples the data transfer rate from the rotational speed by storing data temporarily. This allows the disc to rotate slowly (reducing noise) while the buffer supplies data at the required rate to the signal processing device, resolving the contradiction between noise reduction and data transfer efficiency.
Solution Approach 2:
The system performs preliminary action by filling the buffer with data before reducing rotational speed. When buffer free space is sufficient, the system can safely lower the rotational speed because the buffer already contains enough data to maintain continuous playback without interruption.
3Object-generated harmful factors
If additional parts are added to reduce noise, then harmful factors are reduced, but device complexity increases
Solution Approach 1:
The system uses self-service by utilizing existing components (buffer and controller) to reduce noise without adding dedicated noise reduction hardware. The controller intelligently manages rotational speed based on buffer status, allowing the system to reduce noise through software/control logic rather than physical noise cancellation components.
Solution Approach 2:
The buffer and controller serve multiple functions: data storage, data transfer management, and noise reduction through rotational speed control. This multi-functionality eliminates the need for separate noise reduction components, reducing device complexity while still achieving the noise reduction goal.
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
An optical disc drive device (20) includes a spindle motor (23) that rotates an optical disc (40), an OPU (21), a first controller (26) that causes the spindle motor (23) and the OPU (21) to read recorded data from the rotating optical disc (40), and an transmitter (27b) that transmits the read recorded data to a signal processing device (30) disposed external to the optical disc drive device (20). The recorded data transmitted by transmitter (27b) is stored in a buffer (33) provided in the signal processing device (30). The first controller (26) decreases the rotational speed of the optical disc (40) based on free space information indicating the free space of the buffer (33).