Projector Light Source Unit with Polynomial Reflector
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Solution Overview
Problem
Conventional projector apparatuses are large due to the need for a substantial light source unit to maintain light quantity, making them cumbersome for carrying and installation, as the light emitted from the bulb is attenuated by striking the electrode introducing unit and not efficiently radiated by the convex lens onto the mirror tunnel.
Innovation Solution
A light source unit with a reflector having a polynomial surface shape and a condenser lens positioned on the optical axis, where the bulb is inserted such that the focus position of emitted light is not on the electrode introducing unit, minimizing light attenuation and allowing for efficient light condensation and projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the light source unit is made larger to maintain light quantity, then the light quantity is sufficient, but the projector apparatus becomes large and difficult to carry and install
Solution Approach 1:
The patent extracts the harmful interaction between light and the electrode introducing unit by repositioning the bulb. The bulb is placed such that its focal point is away from the electrode introducing unit, separating the light generation zone from the electrode zone. This allows the light source unit to be miniaturized while maintaining light quantity, as light no longer strikes the electrode introducing unit causing attenuation.
Solution Approach 2:
The patent changes the spatial arrangement by positioning the bulb at a specific focal distance from the reflector opening. This dimensional adjustment ensures that light rays converge at a point away from the electrode introducing unit, allowing compact design while maintaining optical performance and light quantity.
2Quantity of substance
If the bulb is positioned to maximize light emission, then light quantity is improved, but light strikes the electrode introducing unit causing attenuation
Solution Approach 1:
The patent converts the potentially harmful effect of light striking the electrode introducing unit into a beneficial arrangement by carefully positioning the bulb. The bulb is placed at a focal distance where light rays naturally converge away from the electrode introducing unit, transforming what would be a harmful interaction into a non-interacting optical path that preserves light quantity.
3Illumination intensity
If the convex lens is used to condense light, then light distribution is improved, but the lens cannot sufficiently radiate reflected light onto the mirror tunnel incidence plane
Solution Approach 1:
The patent introduces the reflector as an intermediary element between the bulb and the condenser lens. The reflector with its specific focal distance ensures that light is properly directed and concentrated onto the condenser lens, which then efficiently radiates light onto the mirror tunnel incidence plane, solving the problem of insufficient light transmission.
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
This configuration enhances light utilization efficiency, enabling the miniaturization of the light source unit and the projector apparatus by reducing light loss and allowing for a more compact design without compromising light quantity.
Implementation Method 1
a reflector having an opening for housing a lamp and an opening for radiating light, the reflector having an inner surface subjected to mirror surface working to be shaped in a polynomial surface
Implementation Method 2
a condenser lens condensing the light emitted from the reflector, the condenser lens disposed so as to be located on an optical axis of light emitted from the light source
Data Source
AI summary
A light source unit and a projector apparatus secure a certain light quantity by improving the utilization efficiency of light, and thereby realize miniaturization. The light source unit includes a reflector having an opening for housing a lamp and an opening for radiating light, the reflector having an inner surface subjected to mirror surface working to be shaped in a polynomial surface, a light source equipped with a bulb and an electrode introducing unit guiding an electrode to the bulb, the bulb being inserted into the reflector from the opening and being disposed so that a focus position of the light reflected by an inner wall of the reflector is not located on the electrode introducing unit, and a condenser lens condensing the light emitted from the reflector, the condenser lens disposed so as to be located on an optical axis of light emitted from the light source.