Light-emitting device, its control method, and program

JP7876983B2Active Publication Date: 2026-06-22CANON KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
CANON KK
Filing Date
2021-11-05
Publication Date
2026-06-22

AI Technical Summary

Technical Problem

Existing thermal limiting control methods for LEDs used in photography applications, such as modeling lamps and video lights, are inadequate as they do not account for the different illumination durations and temperature rise profiles of these applications, leading to potential LED failure due to overheating.

Method used

A light-emitting device with two emission modes and distinct temperature thresholds for each mode, allowing optimal temperature control based on detected temperature information to prevent overheating during prolonged use.

Benefits of technology

Ensures reliable operation of LEDs by preventing overheating, ensuring they perform according to the specific requirements of each photographic assistance application.

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Patent Text Reader

Abstract

To provide a light emitting device that can perform, for an LED, the optimal temperature control according to the plurality of applications for photographic assistance and can exhibit performance for the applications while ensuring the reliability of the LED, and a method for controlling the same, and a program.SOLUTION: A light emitting device 300 has an LED 322 that assists photographing performed by an imaging apparatus 100, and a temperature sensor 323. The light emitting device has a first light emission mode in which the light emission time of the single lighting of the LED 322 is a first time, and a second light emission mode in which the light emission time is a second time shorter than the first time. The light emitting device performs different types of light emission control for the LED 322 between the first light emission mode and the second light emission mode based on temperature information Tth detected by the temperature sensor 323.SELECTED DRAWING: Figure 1
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