Optical Scanning Cover Structure for Circuit Board Protection
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Solution Overview
Problem
Conventional optical scanning devices face issues where the cover member can damage circuit board elements during assembly due to contact with the variable resistor, leading to variations in laser light quantity and image density defects.
Innovation Solution
The optical scanning device incorporates a cover member with a protective portion and restricted insertion portions that prevent contact with the circuit board, using through holes and insertion mechanisms to ensure safe assembly and protection of electrical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover member is extended to cover the variable resistor on the circuit board, then the laser light quantity is protected from variation and image density defects are prevented, but the cover member may contact and damage electric elements on the circuit board during assembly
Solution Approach 1:
The cover member is divided into a main body portion and a separate protective portion. The protective portion is specifically designed to cover the circuit board area without contacting electric elements, while the main body provides overall protection. This segmentation allows the cover to protect the variable resistor without risking damage to sensitive components.
Solution Approach 2:
A protective portion acts as an intermediary between the cover member and the circuit board. This intermediate structure provides the necessary coverage to prevent laser light quantity variation while maintaining a safe distance from electric elements, thus preventing both image density defects and component damage.
2Ease of operation
If the circuit board is exposed to the outside of the casing for easy access, then maintenance and adjustment are easier, but packaging materials and hands may contact the variable resistor causing light quantity changes
Solution Approach 1:
The cover member is designed with differentiated local qualities: the main body portion provides open access for maintenance operations, while the protective portion specifically covers the variable resistor area. This allows operators to easily access and adjust the variable resistor while preventing accidental contact by packaging materials during transportation and assembly.
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 allows for assembly of the cover member without damaging circuit board elements, maintaining consistent laser light quantity and preventing image defects, while reducing dust ingress and noise leakage.
Implementation Method 1
a rotational polygon mirror unit which rotates around a rotational axis
Implementation Method 2
a semiconductor laser unit which emits a laser luminous flux
Data Source
AI summary
An optical scanning device includes a casing including a bottom portion on which the deflector is disposed and a side wall stood from the bottom portion, a circuit board, a cover closing an opening, formed by the side wall, of the casing. The side wall includes first and second side walls, and the second side wall includes a through hole, and first and second side surfaces of the through hole. The cover includes a protective portion for protecting the circuit board and a restricted portion disposed in a position corresponding to the through hole and including first and second end portions. The restricted portion includes first and second insertion portions to be inserted into the through hole. A distance between the second end portion and the second side surface is smaller than a distance between the protective portion and the closest electric element.