OLED Exposure Device Lens Array Alignment Mechanism
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Solution Overview
Problem
The challenge is to create an exposure device with a line head using OLED light sources that allows for easy adjustment and alignment of multiple light source boards in the subscanning direction while maintaining high image definition, as increasing the number of light-emitting points leads to larger light source boards and complicates the optical assembly alignment.
Innovation Solution
The exposure device incorporates a first and second lens array unit with optical elements aligned parallel to each other, held by respective holders, and a light source assembly with optical element groups positioned at different angles, featuring seating surfaces perpendicular to the optical axes to facilitate alignment and prevent movement errors during adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light source boards are stacked to increase the number of light-emitting points, then image definition is improved, but the optical path lengths become different and alignment adjustment becomes difficult
Solution Approach 1:
The optical assembly is divided into multiple independent light source boards, each with its own optical path. By segmenting the system, each board can be independently adjusted and aligned, making the complex alignment process manageable and enabling high image definition through multiple light-emitting points
Solution Approach 2:
The lens arrays are designed with movable mounting structures that allow dynamic adjustment of their positions and angles. This enables alignment adjustment after assembly, accommodating different optical path lengths of stacked light source boards while maintaining proper optical alignment for high image definition
2Manufacturing precision
If the first lens array and second lens array are disposed at angles to adjust for different optical path lengths, then the optical alignment is improved, but the adjustment work becomes difficult due to movement along contact surfaces
Solution Approach 1:
Adjustment mechanisms such as adjustable mounting brackets or positioning fixtures are introduced as intermediaries between the lens arrays and their supports. These intermediaries enable precise angular and positional adjustment of the lens arrays without the difficulty of directly moving them along contact surfaces, thereby achieving proper optical alignment while maintaining ease of manufacture
Solution Approach 2:
The lens array mounting structures incorporate adjustable elements that allow dynamic positioning at angles relative to the optical axes. This enables the lens arrays to be aligned with different optical path lengths of stacked light source boards, achieving precise optical alignment while keeping the adjustment process manageable through designed 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
This configuration simplifies the alignment process, maintains image quality, and reduces the complexity of adjusting the optical assembly, making the exposure device easier to manufacture and maintain.
Implementation Method 1
a line head using organic light-emitting diodes (OLEDs) as light sources
Implementation Method 2
irradiates a photoconductive drum as an image carrier with light emitted from a plurality of light sources via an optical assembly. Thus, the line head forms an electrostatic latent image on the photoconductive drum
Data Source
AI summary
An exposure device includes: a first lens array unit and a second lens array unit each including a plurality of optical elements formed in a formation surface with respective optical axes parallel to each other, the formation surface of the first lens array unit being not perpendicular to the optical axes; a first lens array holder and a second lens array holder that hold the first lens array unit and the second lens array unit with the respective optical axes of the plurality of optical elements parallel to each other; and a light source assembly in which optical element groups each including a plurality of light-emitting devices aligned in a direction perpendicular to the optical axes are disposed at different positions in a direction parallel to the optical axes, wherein the first lens array unit is provided with a first seating surface and a second seating surface.