Onboard Optical Disc Cooling via Sub CPU Control

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Solution Overview

Problem

Conventional onboard optical disc devices suspend data reading and writing operations when in-vehicle temperatures are high, leading to prolonged suspension times and user inconvenience.

Innovation Solution

An onboard optical disc device with a control unit comprising a main CPU, a sub CPU, and a temperature sensor, where the sub CPU drives the drive unit when the main CPU's temperature exceeds a set value, facilitating cooling through wind-generated by the optical disc's spinning, thereby reducing suspension time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If data reading and writing are suspended when in-vehicle temperature is high, then the optical disc device protects itself from thermal damage, but the suspension time becomes prolonged and user convenience deteriorates

Engineering Contradiction:

Improvethermal protectionVSAvoidsuspension time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The control unit is divided into a main CPU and a sub CPU. The main CPU suspends operations when temperature exceeds a threshold, while the sub CPU independently monitors temperature and controls the drive unit to generate cooling wind, enabling parallel temperature management functions

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The optical disc spinning itself generates cooling wind that serves the dual purpose of data reading and CPU temperature reduction. The system uses the existing mechanical rotation to create a cooling effect without requiring separate active cooling components

Inventive Principle:

Principle #25Self-service

2Reliability

If the main CPU suspends operations when temperature is high, then thermal damage is prevented, but the optical disc cannot be cooled effectively and suspension time increases

Engineering Contradiction:

ImproveCPU thermal protectionVSAvoidcooling duration

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The sub CPU starts the drive unit before the main CPU resumes operations. By pre-spinning the optical disc, the cooling wind is generated in advance, ensuring the CPU is cooled before data operations restart, thereby preventing thermal damage while reducing suspension time

Inventive Principle:

Principle #10Preliminary action

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

Shortens the suspension time of data reading and writing operations by actively cooling the main CPU using wind generated by the optical disc's spinning, allowing for quicker resumption of operations in high in-vehicle temperatures.

Implementation Method 1

cooling of the main CPU advances by the wind based on the driving of the optical disc

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentEP2782099B1Onboard optical disk device

Publication Date: 2018.01.03 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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AI summary

When the temperature of a main CPU detected by a temperature sensor exceeds a set temperature, a sub CPU drives a drive unit of an optical disc under the condition where the operation of the main CPU is suspended to stop the rise in temperature caused by the main CPU. In this case, cooling of the main CPU advances by the wind based on the driving of the optical disc, and as a result, the suspension time of data reading from the optical disc or data writing to the optical disc until the main CPU restarts can be shortened.