Mobile Slide Projector Using Camera Flash
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Solution Overview
Problem
Existing image projection devices integrated with mobile devices are costly due to the integration of an LED light source and lack the capability to project high-quality images, as seen in novelty flashlights and entertainment accessories.
Innovation Solution
An image projection device that utilizes a mobile device's camera flash as a light source, featuring a slide frame receiving slot, a magnifying lens, and a focus adjustment mechanism, which can be attached to the mobile device using a nano-suction material or clamp, and includes a slide decoder for encoding information to trigger events based on detected changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an LED light source is integrated within the mobile device for image projection, then the device can project images, but the production cost significantly increases
Solution Approach 1:
The patent extracts the light source function from the projection device and assigns it to the mobile device's existing camera flash. By removing the requirement for an integrated LED light source, the solution eliminates the costly component while maintaining image projection capability through the borrowed flash illumination.
Solution Approach 2:
The mobile device's camera flash, originally designed for a single function (illumination for photography), is repurposed to serve dual functions: its primary photography function and the additional function of illuminating slides for projection. This multi-functionality approach eliminates the need for dedicated projection hardware.
2Ease of manufacture
If a camera flash is used as the light source, then device cost is reduced, but the light output may not be sufficient for high-quality projection
Solution Approach 1:
The patent employs dynamic control of the camera flash through programmable microprocessor that can adjust flash duration, intensity, and timing. The flash illumination is synchronized with slide changes and projection requirements, optimizing light output for high-quality projection while maintaining low cost.
Solution Approach 2:
The camera flash is used in periodic intervals synchronized with slide changes rather than continuous illumination. The flash activates at specific moments when slides are changed, providing sufficient light output for projection quality while minimizing overall energy consumption and heat generation.
3Device complexity
If the magnifying lens is fixed, then device structure is simplified, but focus adjustment capability is lost
Solution Approach 1:
The magnifying lens is made movable along the optical axis through a focus adjustment mechanism that can be manually operated or motorized. This dynamic positioning capability allows the lens to be adjusted for different slide distances and projection requirements, maintaining image focus quality while adding minimal structural complexity.
Solution Approach 2:
The focus adjustment mechanism is pre-configured with positioning systems that can be manually or automatically adjusted before projection begins. The lens can be preliminarily positioned at the correct focal plane, and the system can maintain focus during operation, eliminating the need for complex real-time adjustment mechanisms.
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
Enables the projection of high-quality images using a mobile device's camera flash, allowing for adjustable focus and encoding information to synchronize multimedia playback with projected slides, enhancing user experience without increasing device production costs.
Implementation Method 1
a magnifying lens aligned with the aperture, the magnifying lens positioned at a front end of the body... the magnifying lens enlarges the illuminated slide transparency to project upon a projection surface
Implementation Method 2
A slide transparency contained in a slide frame can be positioned with the slide frame receiving slot and the camera flash illuminates the slide transparency
Data Source
AI summary
An image projection device is disclosed having a body defining an aperture that includes a slide frame receiving slot that is transverse to the aperture and a magnifying lens positioned in alignment with the aperture at the front of the body. The image projection device can be attached to a mobile device and uses the camera flash of the mobile device to provide the light source to illuminate a slide transparency. The mobile device can identify a particular slide transparency through information encoded on the slide frame in order to coordinate audio or video output with the projected slide.