Light Scanning Housing Light Blocking Portions for Ghost Light
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Solution Overview
Problem
Ghost light, caused by laser beams being reflected by the cylindrical surface of light source holders, results in unintended images being formed on the photosensitive surface, leading to image defects in light scanning apparatuses.
Innovation Solution
A light scanning apparatus design featuring a rotary polygon mirror and light blocking portions integrated into the housing to prevent ghost light, where the light blocking portions are formed between the light sources and the rotary polygon mirror to block laser beams reflected by the inner walls of the light source holders, ensuring the beams do not reach the photosensitive surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light blocking members are provided to prevent ghost light, then image quality is improved, but device complexity increases
Solution Approach 1:
The light blocking portions are integrated into the housing structure itself, merging the light blocking function with the housing. This eliminates the need for separate light blocking members, thereby preventing ghost light while avoiding increased device complexity. The housing serves dual purposes: structural support and light blocking.
2Ease of manufacture
If the housing structure is simplified for downsizing, then manufacturing cost is reduced, but preventing ghost light becomes more difficult
Solution Approach 1:
The light blocking portions are formed as integral parts of the housing structure, combining multiple functions into a single component. This integration simplifies the overall structure, enabling downsizing and reducing manufacturing costs while effectively blocking ghost light through the housing's own geometry.
Solution Approach 2:
The housing structure, which could potentially reflect laser beams and cause ghost light, is designed with specific light blocking portions that convert this potential harm into a benefit. The same housing that provides structural support now actively prevents ghost light, turning a potential problem source into a solution.
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
Prevents image defects by effectively blocking ghost light, reducing the influence of surface eccentricity and achieving downsizing and cost reduction in the housing while maintaining image quality.
Implementation Method 1
When the laser beam emitted from the light source travels in the light source holder holding the light source, the laser beam may be reflected by a cylindrical surface of the light source holder and travel in an unintended direction.
Data Source
AI summary
A light scanning apparatus including: a bottom surface on which a rotary polygon mirror is mounted; a housing including a bottom surface on which the rotary polygon mirror is mounted and a side wall portion on which a first light source and a second light source are mounted, the side wall portion standing from the bottom surface; and a wall portion standing from the bottom surface, the wall portion being configured to block a first light beam emitted from the first light source and reflected by an inner wall of a first holder holding the first light source and a second light beam emitted from the second light source and reflected by an inner wall of the second holder holding the second light source.