Disc Drive Detection Using Segmented Light Sensors
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Solution Overview
Problem
Conventional disc drive apparatuses struggle to accurately identify and differentiate between discs of varying diameters and light shielding properties, leading to erroneous detection and potential failure in loading or ejecting discs with high light transmittance.
Innovation Solution
The implementation of a disc drive apparatus with multiple detectors and a disc identifier system that differentiates between discs based on their size and light shielding characteristics, using a combination of contact and light detection methods to accurately identify and manage discs of different types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single light detecting means is used to identify disc type, then the device structure is simple, but the detection accuracy is insufficient for discs with high light transmittance
Solution Approach 1:
The detection system is segmented into multiple independent light detecting means (first light detecting means and second light detecting means) positioned at different locations. Each detector independently monitors light transmission, and their combined outputs enable accurate identification of disc types including those with high light transmittance, resolving the contradiction between detection accuracy and system complexity.
Solution Approach 2:
The multiple light detecting means serve universal detection functions - they collectively identify various disc types (ordinary discs, discs with high light transmittance, adaptors) through different detection patterns. This multi-functional approach enhances reliability while maintaining manageable system complexity through standardized detection mechanisms.
2Measurement precision
If conventional light detection method is used, then the detection system is simple, but erroneous detection occurs for discs with high light transmittance
Solution Approach 1:
The system introduces an intermediary detection mechanism - a second light detecting means positioned at a specific location that detects light transmission through the center region. This intermediary detector mediates the identification process by providing additional information about light transmittance characteristics, enabling precise differentiation between disc types despite high light transmittance interference.
Solution Approach 2:
The system changes the detection parameters by using multiple detectors at different positions with different detection characteristics. By analyzing the combined output signals from detectors positioned at different locations, the system achieves precise measurement of disc type identification while compensating for the harmful effect of high light transmittance.
3Reliability
If multiple detectors are added to improve detection accuracy, then the detection reliability increases, but the device complexity increases
Solution Approach 1:
The detection system is divided into segmented functional units - a first light detecting means for general detection and a second light detecting means for specialized detection. This segmentation allows each detector to perform its specific function independently, improving overall reliability while keeping the complexity of each individual unit manageable.
Solution Approach 2:
The multiple detectors are designed with universal detection capabilities, using the same basic light detection technology but positioned and configured for different detection purposes. This universality allows the system to achieve high reliability through redundant detection functions while avoiding the complexity of entirely different detection mechanisms.
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 stable and accurate identification and handling of various disc types, including those with high light transmittance, ensuring proper loading and ejecting operations without errors.
Implementation Method 1
a light emitting unit 919A is attached into an opposed position to the light receiving unit 913A
Implementation Method 2
a light receiving unit 913A provided on a left end side in FIG. 50 in the transverse direction of the disc insertion port 910
Data Source
AI summary
The present invention provides a disc drive apparatus capable of identifying a disc (12 cm) having a small data area (8 cm) in central as same as an ordinary 12 cm disc. The apparatus having a light receiving unit 105b and a push switch 106b. The unit 105b is arranged in a position where the unit 105b detects the disc having the small data area in central when the switch 106b detects the same, and where the unit 105b does not detect a disc (12 cm) having a hole (8 cm) in central when the 106b detects the same. The apparatus also has an disc identifier for identifying type of the disc based on the detected results of the light receiving units and/or the push switches.