Detachable Filter Box for Projector Dust Management
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Solution Overview
Problem
Existing image projection devices face frequent filter replacements due to dust accumulation, leading to increased pressure loss and reduced cooling efficiency, and incorporating external cooling devices increases projector size and cost without extending filter life.
Innovation Solution
An image projection unit with a detachable filter box that covers the air inlet, featuring a box-side filter with a larger area than the main body filter, reducing dust accumulation and pressure loss, and optionally equipped with a fan or cooling mechanism to enhance cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter is provided externally to cover the projector main body, then dust intrusion is prevented, but the filter life cannot be extended and the external filter needs to be replaced even if the main body filter does not need to be replaced
Solution Approach 1:
The patent combines the external filter box with the main body filter into a unified filtration system. The filter box is designed to attach to the main body and work cooperatively with the main body filter, allowing the filtration function to be distributed across both components. This merging enables the system to benefit from the larger total filter area while maintaining a manageable replacement cycle based on the main body filter's service life.
Solution Approach 2:
The filtration system is segmented into two distinct parts: the filter box with its own filter and the main body filter. This segmentation allows the filter box to be replaced independently or together with the main body filter, providing flexibility in maintenance. The segmented design also enables the system to achieve extended filter life by utilizing the larger total filtration area distributed across both segments.
2Temperature
If a cooling device with fan and Peltier element is incorporated into the projector, then cooling performance is improved and noise is reduced, but the projector main body is increased in size and cost
Solution Approach 1:
The patent extracts the cooling function from the main body by providing a separate filter box that can be attached to the main body. This extraction allows the main body to remain compact while still benefiting from enhanced cooling capabilities through the externally attached filter box, which can incorporate cooling components without increasing the main body's size.
Solution Approach 2:
The filter box is designed with detachable and attachable characteristics, allowing it to be dynamically configured on or off the main body. This dynamic design enables the system to adapt between different operational modes: with the filter box attached for enhanced cooling and filtration, or detached for a more compact configuration, providing flexibility without permanent size increase.
3Temperature
If a cooling device is incorporated into the projector, then effective cooling is achieved, but a structure unnecessary for users who do not place importance on noise reduction is built in, increasing size and cost
Solution Approach 1:
The filter box with its cooling capabilities is designed as a dynamic, attachable component rather than a fixed feature. Users can attach the filter box when enhanced cooling and noise reduction are needed, and detach it when these features are not required. This dynamic configuration allows the system to adapt to different user needs, providing cooling effectiveness only when necessary, thereby avoiding unnecessary size and cost for users who do not prioritize noise reduction.
Data Source
AI summary
To provide an image projection unit that can reduce the frequency of filter replacement and extend the life of an image projection device main body.Provided is an image projection unit including: a main body (10) of an image projection device; and a filter box (100A) that can be attached/detached to/from the main body (10), and at least covers an air inlet of the main body. A box-side filter provided for the filter box (100A) has a total area larger than an area of a main body filter provided at the air inlet of the main body (10).