Surveillance Camera Shading Shield for Wide-Angle Overexposure

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Solution Overview

Problem

Surveillance camera systems face image overexposure issues due to non-directional reflected light from the light module onto the reflective case when the rotatable filming and light modules exceed 60 degrees from the vertical axis, limiting the filmable angle zone.

Innovation Solution

A shading device with a movable shading shield that adjusts to shade part of the light emitted by the light module, preventing it from projecting onto the reflective object, allowing the modules to rotate up to 90 degrees without overexposure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the filming module and light module rotate to a large angle zone (up to 90 degrees from vertical axis), then the filmable angle zone is enlarged, but image overexposure occurs due to reflected light from the light module onto the reflective case

Engineering Contradiction:

Improvefilmable angle zoneVSAvoidimage overexposure

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The harmful reflected light is extracted and blocked by the shading shield, which is positioned to intercept light rays before they reach the reflective case. The shield removes the problematic light paths while allowing useful light to reach the lens, thus preventing overexposure without limiting the rotation angle.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The shading shield acts as an intermediary element between the light module and the reflective case. It mediates the light interaction by selectively blocking reflected light paths while permitting direct light to pass through to the lens, thus resolving the contradiction between wide-angle operation and overexposure prevention.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the rotating angle is limited to less than 60 degrees from the vertical axis, then image overexposure is avoided, but the filmable angle zone is reduced

Engineering Contradiction:

Improveimage overexposureVSAvoidfilmable angle zone

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The shading shield is designed to rotate synchronously with the filming module and light module, dynamically adjusting its position to maintain optimal shading angles throughout the rotation range. This dynamic adaptation allows the system to prevent overexposure at all rotation angles up to 90 degrees, rather than being limited to a fixed angular range.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the angular parameters of the shading shield's position and orientation to match the rotation of the filming module. By dynamically adjusting these geometric parameters, the shield effectively blocks reflected light paths at any rotation angle while maintaining the desired filmable angle zone.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If a shading device is added to block reflected light, then image overexposure is prevented, but the device complexity increases

Engineering Contradiction:

Improveimage overexposureVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The shading shield serves multiple functions: it blocks reflected light from reaching the reflective case, prevents overexposure of images, and can be integrated with the existing rotational mechanism of the filming module. This multi-functionality justifies the added component by providing several benefits within a single element.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The shading shield is merged with the rotational mechanism of the filming module and light module, sharing the same support shaft and rotating synchronously. This integration reduces the need for separate drive mechanisms and simplifies the overall structure despite adding the shading function.

Inventive Principle:

Principle #5Merging (Combining)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The shading device effectively prevents image overexposure by shading the reflective light, thereby enlarging the filmable angle zone and enabling the filming and light modules to rotate 90 degrees without image overexposure.

Implementation Method 1

the shading shield shades part of the light emitted by the light module that the part of light will not project onto the reflective object of the camera

Methodology Applied

Scientific EffectLight blocking/Shading: Absorption (EM radiation)

Data Source

PatentUS9628683B2Shading device for the light module of a surveillance camera

Publication Date: 2017.04.18 TOPVIEW OPTRONICS CORP

AI summary

A shading device for the light module of the surveillance camera, wherein the light module rotates, with the filming module of the camera, back and forth between the vertical axis and horizontal axis of the camera. The shading device includes a shading shield that can moves back and forth between the first position and the second position. When the light module and the filming module rotate to a preset angle zone that is near the horizontal axis, the shading shield will move with the light module and the filming module, and the shading shield shades part of the light emitted by the light module that the part of light will not project onto the reflective object of the camera.