Optical Scanning Device Spot Tilt Control
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Solution Overview
Problem
Existing optical scanning devices face challenges in miniaturization, leading to increased maximum incident angles that result in tilted exposure points and blurred image edges due to large scanning incident angles, affecting image quality.
Innovation Solution
The optical scanning device incorporates a light source, a first optical unit for collimating and focusing the light beam, an optical deflector, and an imaging optical system that ensures a maximum incident angle Φmax and spot tilt rate e/a ≤ 10% when the light beam is deflected, using an F-θ lens and controlling the rotation angle and speed of the optical deflector to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the maximum incident angle is increased to shorten the optical path, then the volume of the optical scanning device is reduced, but the image quality deteriorates due to tilted exposure points and blurred edges
Solution Approach 1:
The patent applies parameter changes by precisely controlling the maximum incident angle Φmax and spot tilt rate e/a as key optical parameters. By setting specific numerical ranges for these parameters (Φmax and e/a ≤ 10%), the invention optimizes the balance between compact size and image quality, resolving the contradiction through quantitative parameter optimization rather than qualitative design changes.
2Length of stationary object
If the optical path is shortened to reduce device volume, then the maximum incident angle increases, but this causes spot tilt and blurred image edges
Solution Approach 1:
The patent applies preliminary anti-action by pre-controlling the spot tilt rate e/a to be 10% or less before the imaging process occurs. This preventive measure ensures that even when the optical path is shortened and maximum incident angles increase, the spot tilt is compensated for in advance through optical system design, preventing blurred edges from occurring in the first place.
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 spot tilt and tilt rate, preventing blurred edges and enhancing image quality by maintaining the spot tilt rate below 10%, even at maximum scanning angles, thus improving the overall performance of the optical scanning device.
Implementation Method 1
a first optical unit, configured to collimate the light beam emitted by the light source in a main scanning direction and focus the light beam emitted by the light source in an auxiliary scanning direction
Implementation Method 2
a first optical unit, configured to collimate the light beam emitted by the light source in a main scanning direction and focus the light beam emitted by the light source in an auxiliary scanning direction
Implementation Method 3
an optical deflector, configured to deflect the light beam emitted by the light source
Implementation Method 4
an imaging optical system, configured to guide the light beam deflected by the optical deflector to a scanned surface for imaging
Data Source
AI summary
An optical scanning device and an imaging apparatus are provided. The optical scanning device includes a light source for emitting a light beam, a first optical unit for collimating the light beam emitted by the light source in a main scanning direction and focus the light beam in an auxiliary scanning direction, an optical deflector for deflecting the light beam, and an imaging optical system for guiding the light beam to a scanned surface for imaging. When the optical deflector deflects the light beam at a maximum deflection angle, the light beam in the main scanning direction forms a maximum incident angle Φmax with a normal line of the scanned surface. A spot tilt rate e/a of a light spot on the scanned surface satisfiesea≤10%,where a is a size of the light spot in the main scanning direction and e is a spot tilt.