Optical Writing Device Joint Configuration for Ghost Light Suppression
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Solution Overview
Problem
Conventional optical writing devices face a trade-off between maintaining alignment accuracy and suppressing ghost light, as thin metal films for joining enhance transmissivity but increase the risk of ghost light, while thick films reduce transmissivity and compromise alignment accuracy.
Innovation Solution
The optical writing device employs a joint configuration with a metal layer and an intermediate dielectric layer, optimized for peak transmissivity in a specific wavelength band, along with alignment markers, to allow high transmissivity for alignment observation while minimizing ghost light by using different wavelengths for alignment and light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thin metal films are used for joining to increase transmissivity, then alignment accuracy is improved, but ghost light increases
Solution Approach 1:
The joint structure is segmented into multiple functional layers: a first metal film for joining, a dielectric layer for optical control, and a second metal film for joining. This segmentation allows each layer to perform its specific function - the dielectric layer controls transmissivity to suppress ghost light while the metal films provide mechanical joining and allow optical observation of alignment markers.
Solution Approach 2:
The dielectric layer's refractive index and thickness are optimized to control the joint's transmissivity characteristics. By changing these parameters, the joint exhibits high transmissivity at specific wavelengths for alignment observation while maintaining low transmissivity at other wavelengths to suppress ghost light from the light emitting substrate.
2Object-generated harmful factors
If thick metal films are used for joining to suppress ghost light, then ghost light is reduced, but alignment accuracy deteriorates
Solution Approach 1:
The dielectric layer's refractive index and thickness are optimized to control the joint's transmissivity characteristics. By changing these parameters, the joint exhibits high transmissivity at specific wavelengths for alignment observation while maintaining low transmissivity at other wavelengths to suppress ghost light from the light emitting substrate.
Solution Approach 2:
The joint uses a composite structure combining metal films and dielectric materials. This composite structure leverages the complementary properties of each material: metals provide mechanical strength and electrical conductivity, while the dielectric layer provides optical control through its refractive index and thickness, enabling simultaneous ghost light suppression and alignment observation.
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 ensures both securement of alignment accuracy and suppression of ghost light, maintaining high transmissivity for alignment markers while preventing ghost light from the light emitting substrate, thereby improving image quality.
Implementation Method 1
an intermediate layer for providing a peak of total transmissivity of the joint in a first wavelength band
Data Source
AI summary
An optical writing device includes: a light emitting substrate on which light emitting device groups obtained by grouping light emitting devices is arranged; a lens array including image forming lenses condensing light emitted from the light emitting devices on an image carrier; a first base material including the lens array; and a second base material including the light emitting substrate or the lens array, wherein the first and/or second base materials, each of which includes a joint formed in a joint part with the other member, is a transparent body, the joint includes a metal layer, an intermediate layer providing a peak of total transmissivity of the joint in a first wavelength band, and a marker for alignment, the first and second base materials are joined via the metal layer, and the light emitting devices emit light of a wavelength band out of the first wavelength band.