Rotational Wheel Device Superposes Optical Paths in Projector Light Source
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Solution Overview
Problem
Conventional light source apparatuses for projectors often suffer from increased size and color shading due to separate optical paths for excitation light and other wavelength ranges, leading to inaccuracies in color representation.
Innovation Solution
A light source apparatus featuring a rotational wheel device with a filter area and direction-changing transmission area that superposes the axis of excitation light with the axis of luminescent light in different wavelength ranges, eliminating the need for separate optical paths and reducing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dichroic mirror is separately disposed in addition to the luminescent wheel and color wheel, then the optical path can be separated for different wavelength ranges, but the light source apparatus is enlarged in size and color shading may be caused by inaccuracy in the separate optical path
Solution Approach 1:
The patent combines the dichroic mirror function with the color wheel by forming a wavelength-selective reflective film directly on the color wheel substrate. This integration eliminates the need for a separate dichroic mirror component, merges multiple optical functions into a single element, and superposes the optical paths of excitation light and luminescent light to coincide, thereby reducing the apparatus size while maintaining color representation accuracy.
2Device complexity
If a dichroic mirror is separately disposed in addition to the luminescent wheel and color wheel, then the optical path can be separated for different wavelength ranges, but color shading is caused by an inaccuracy attributed to the formation of the separate optical path
Solution Approach 1:
The patent merges the dichroic mirror function with the color wheel by forming a wavelength-selective reflective film directly on the color wheel substrate. This integration eliminates the need for a separate dichroic mirror component, merges multiple optical functions into a single element, and superposes the optical paths of excitation light and luminescent light to coincide, thereby reducing the apparatus size while maintaining color representation accuracy.
3Ease of manufacture
If separate optical paths are used for excitation light and luminescent light, then wavelength separation is achieved, but the light source apparatus requires more components and larger space
Solution Approach 1:
The patent combines the dichroic mirror function with the color wheel by forming a wavelength-selective reflective film directly on the color wheel substrate. This integration eliminates the need for a separate dichroic mirror component, merges multiple optical functions into a single element, and superposes the optical paths of excitation light and luminescent light to coincide, thereby reducing the apparatus size while maintaining color representation accuracy.
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 reduces the size of the light source apparatus, enhances efficiency, and minimizes color shading by aligning the optical paths of excitation and luminescent light, resulting in improved color representation and projector performance.
Implementation Method 1
a luminescent light emission device configured to receive the excitation light reflected on the filter area to thereby emit luminescent light including the light in the predetermined wavelength range
Implementation Method 2
a direction-changing transmission area configured to transmit the excitation light while changing a direction of the excitation light
Implementation Method 3
a filter area configured to transmit light in a predetermined wavelength range which differs from a wavelength range of the excitation light and reflect the excitation light
Data Source
AI summary
A light source apparatus includes an excitation light shining device for emitting excitation light, a rotational wheel device including a rotational wheel including a filter area for transmitting light in a predetermined wavelength range differing from a wavelength range of the excitation light and reflecting the excitation light and a direction-changing transmission area for transmitting the excitation light while changing a direction thereof, and a luminescent light emission device which receives the excitation light reflected on the filter area to thereby emit luminescent light including the light in the predetermined wavelength range towards the filter area, and the rotational wheel device is disposed so that an axis of the excitation light which passes through the direction-changing transmission area and an axis of the luminescent light in the predetermined wavelength range which passes through the filter area are superposed on each other.