Lighting Device Accessory Detection for Temperature Control

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Solution Overview

Problem

Lighting devices for image pickup apparatuses, such as digital cameras, face challenges in controlling light emission to prevent temperature rises, especially when optical accessories are attached, leading to potential heat-related issues and limited light emission timing.

Innovation Solution

Incorporating a detection unit to identify the attachment of optical accessories and a control unit to adjust light emission accordingly, limiting emission based on detected conditions to manage temperature rises effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If light emission is limited to prevent temperature rise, then temperature control is improved, but light emission timing is restricted

Engineering Contradiction:

Improvetemperature rise of lighting deviceVSAvoidlight emission timing

Core Design Contradiction:

TemperatureVSProductivity

Solution Approach 1:

The patent implements dynamic light emission control that adapts to real-time temperature conditions and optical accessory states. The control unit dynamically adjusts light emission parameters based on detected temperature rise and accessory attachment, allowing flexible operation rather than fixed limitation. This resolves the contradiction by making the system adaptive - when temperature is low or accessories are attached, light emission can proceed; when temperature rises without accessories, emission is limited.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the control parameter from a fixed light emission limit to a conditional limit based on temperature and accessory state. By introducing temperature as a variable parameter and detecting accessory attachment state, the system adjusts the light emission control threshold dynamically. This allows the system to maintain productivity when conditions permit while preventing temperature rise when necessary.

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If optical accessories are attached for color or light distribution adjustment, then lighting quality is improved, but temperature rise is exacerbated

Engineering Contradiction:

Improvelighting qualityVSAvoidtemperature rise of lighting device

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The patent implements a feedback mechanism where the detection unit monitors accessory attachment state and the control unit adjusts light emission control parameters accordingly. When accessories are detected, the system receives feedback that temperature dissipation is already improved, so light emission can proceed with less restriction. This feedback loop resolves the contradiction by allowing the system to maintain both lighting quality (through accessory use) and temperature control (through adjusted emission limits).

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10158794B2Lighting device that controls light emission while suppressing temperature rise, image pickup apparatus, and method of controlling lighting device

Publication Date: 2018.12.18 CANON KK

AI summary

A lighting device capable of performing satisfactory light emission control while suppressing a rise in the temperature of the lighting device irrespective of the attachment of an optical accessory. In the lighting device, an accessory detection section detects whether or not an optical accessory for color adjustment or light distribution angle adjustment is attached to a light emission section, and light emission performed by the light emission section is limited based on a result of detection performed by the accessory detection section.