Optical output control system

The light output control system addresses the limitations of existing LED control methods by using coefficient-based control functions to achieve accurate and rapid light output adjustments, considering individual device characteristics and time-based changes.

JP7708046B2Active Publication Date: 2025-07-15USHIO INC
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Patent Information

Application Number
JP2022139227
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-09-01
Publication Date
2025-07-15
Estimated Expiration
2042-09-01

AI Technical Summary

Technical Problem

Existing light output control methods for LEDs, such as those using feedforward control with data tables, struggle with high data requirements and limited responsiveness, especially in applications requiring fine adjustments, and fail to account for individual device differences and characteristic changes over time.

Method used

A light output control system that uses a control unit to determine current supply based on a control function defined by coefficients, considering ambient temperature and target light output, with the ability to update coefficients for individual device characteristics and time-based changes.

Benefits of technology

Enables high-accuracy, responsive light output control with reduced data requirements, accounting for device variations and lifespan changes, ensuring precise and rapid adjustments.

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Abstract

To provide an optical output control system in consideration of an individual difference between each light source device, even with an amount of data smaller than that in a conventional feed-forward type control method.SOLUTION: An optical output control system includes: a light source part including light-emitting elements; a current supply part for supplying current to the light source part; a temperature detection part for detecting an environmental temperature of the light source part; and a control part for controlling the current amount supplied to the light source part, on the basis of an execution control function in which a relation among a first variable corresponding to a target value relating to optical output, a second variable corresponding to the environmental temperature and a third variable corresponding to a current amount supplied to the light source part includes one or a plurality of coefficients. The control part is configured to update at least the one coefficient constituting the execution control function, on the basis of the input coefficient update information.SELECTED DRAWING: Figure 1
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Citation Information

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