Transfer Thyristor Light Emitting Part With Coupled Gates
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Solution Overview
Problem
Current light emitting devices, particularly in image forming apparatuses like printers and copiers, face challenges in efficiently controlling and managing the light emission of light emitting elements, such as LEDs and thyristors, to achieve precise and reliable image formation with reduced size and complexity.
Innovation Solution
A light emitting part comprising plural light emitting elements, transfer thyristors, three-terminal switch elements, and resistances, where the three-terminal switch elements and resistances are connected in series between the second gate of a transfer thyristor and the first gate of the next transfer thyristor, allowing cyclic selection and grouping of transfer thyristors to control light emission effectively, with specific potential settings for signal lines to ensure proper state transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transfer thyristors are used to control light emitting elements in image forming apparatus, then light emission control precision is improved, but device complexity increases due to multiple gates and signal lines required for each thyristor
Solution Approach 1:
The patent combines multiple transfer thyristors into groups where thyristors within each group share common signal lines. Specifically, first transfer thyristors share a first transfer signal line, and second transfer thyristors share a second transfer signal line, reducing the total number of signal lines needed while maintaining individual control capability through the coupled gate structure
Solution Approach 2:
The coupled gates serve multiple functions: they receive transfer signals from shared signal lines, enable selective light emission control for multiple light emitting elements, and facilitate cyclic scanning operation. The gates act as universal control points that can trigger multiple thyristors simultaneously while maintaining individual element addressability
2Reliability
If multiple transfer signal lines are used to control different groups of transfer thyristors, then light emission control reliability is improved, but the number of signal lines and device complexity increase
Solution Approach 1:
The patent segments the light emitting elements and transfer thyristors into distinct first and second groups, with each group controlled by dedicated transfer signal lines. This segmentation allows independent control of different light emitting regions while using a limited number of signal lines through the cyclic scanning mechanism
Solution Approach 2:
The patent implements cyclic scanning operation where transfer thyristors are selectively activated in repeating cycles. During each cycle, first transfer thyristors are turned on during a first period to emit light from first light emitting elements, then second transfer thyristors are turned on during a second period to emit light from second light emitting elements, enabling reliable control with periodic signal patterns
Data Source
AI summary
Cathodes of a first group of plural transfer thyristors are connected with a first transfer signal line, and also connected with a first reception terminal through a first current limiting resistance. A first transfer signal is transmitted to the first reception terminal. Cathodes of a second group of the plural transfer thyristors are connected with a second transfer signal line, and also connected with a second reception terminal through a second current limiting resistance. A second transfer signal is transmitted to the second reception terminal. The plural transfer thyristors each have an anode, a cathode, a first gate, and a second gate. A three-terminal switch element and a resistance are connected between a second gate of a former transfer thyristor and a first gate of a later transfer thyristor, the former and later transfer thyristors being closely arranged upstream and downstream transfer thyristors among the plural transfer thyristors.