Koito Manufacturing has patented an automotive lamp featuring a temperature-sensing element that adjusts the driving current of a semiconductor light source based on temperature changes. The design ensures varying temperature differentials in two specified temperature ranges, enhancing the lamp’s performance and efficiency. GlobalData’s report on Koito Manufacturing gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Koito Manufacturing, AV lighting system was a key innovation area identified from patents. Koito Manufacturing's grant share as of June 2024 was 52%. Grant share is based on the ratio of number of grants to total number of patents.
Automotive lamp with temperature-sensitive driving current control
The patent US12048073B2 describes a novel lighting circuit designed to optimize the performance of a semiconductor light source through a temperature-sensing mechanism. The circuit features a temperature-sensing element that alters its electrical state based on the temperature of the light source. A constant current driver generates a driving current that is responsive to this temperature, with specific characteristics defined by two temperature ranges. The first range, from a reference temperature (T0) to a first temperature (T1), exhibits a smaller maximum temperature differential in the driving current compared to the second range, which extends from T1 to a second temperature (T2). The constant current driver includes a current source, resistors, and a Negative Temperature Coefficient (NTC) thermistor, which collectively manage the driving current based on the impedance of the circuit.
Additionally, the patent outlines the configuration of the lighting circuit, which can be integrated into an automotive lamp. The circuit is designed to ensure that the driving current behaves predictably across different temperature ranges, with provisions for both positive and negative temperature differentials. The claims also detail a reference voltage generating circuit that aids in stabilizing the operation of the current source. This circuit includes various components such as transistors and resistors, which work together to maintain consistent performance under varying thermal conditions. Overall, the invention aims to enhance the reliability and efficiency of lighting systems, particularly in automotive applications, by intelligently managing the driving current in response to temperature changes.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
