Light Scanning Casing Seat Surfaces for Shaft Inclination Accuracy
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Solution Overview
Problem
Existing light scanning apparatuses face challenges in maintaining shaft inclination accuracy when mounting deflection devices with different specifications to a common optical box, leading to reduced imaging performance and image quality due to differences in shaft diameter, mirror height, and drive board size.
Innovation Solution
The design includes a casing with specific seat surfaces to accommodate both low-speed and high-speed deflection portions, where the second seat surfaces are arranged outside the region formed by connecting the first seat surfaces, allowing for precise positioning and support of motors with varying specifications without compromising shaft inclination accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a common optical box is used to mount deflection devices with different specifications, then device versatility and productivity are improved, but shaft inclination accuracy deteriorates due to differences in shaft diameter, mirror height, and drive board size
Solution Approach 1:
The optical box is segmented into multiple mounting regions with distinct seat surface arrangements. First seat surfaces accommodate deflection devices with lower maximum revolutions, while second seat surfaces accommodate deflection devices with higher maximum revolutions. This segmentation allows each region to be optimized for its specific device type, maintaining shaft inclination accuracy while supporting device versatility.
Solution Approach 2:
Different regions of the optical box are given different local qualities through distinct seat surface configurations. The first and second seat surfaces are arranged at different positions and orientations to match the specific mounting requirements of different deflection device specifications. This local customization ensures that each device type receives appropriate support and positioning, preserving shaft inclination accuracy across different device variations.
2Productivity
If motors with different maximum revolutions are used to increase productivity, then output speed is improved, but device complexity increases due to varying shaft diameters, mirror heights, and drive board sizes
Solution Approach 1:
The optical box is designed with universal mounting capabilities through multiple seat surface configurations. The casing can accommodate deflection devices with different motor specifications (different shaft diameters, mirror heights, and drive board sizes) by selecting appropriate seat surfaces. This multi-functional design allows a single optical box to support various motor types, enabling productivity enhancement without proportionally increasing overall device complexity.
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 enables the positioning of deflection devices with different specifications in a common optical box without reducing shaft inclination accuracy, enhancing imaging performance and maintaining image quality.
Implementation Method 1
a light scanning apparatus used in an electrophotographic image forming apparatus forms light spots on a surface to be scanned by deflecting a light beam emitted from a light source with a deflection device which includes a rotary polygon mirror
Implementation Method 2
converging the light beam toward the surface to be scanned with an imaging optical system. The deflection device and the imaging optical system including lenses and reflective mirrors
Data Source
AI summary
Provided is a casing of a light scanning apparatus accommodating a rotary polygon mirror and an optical member, the casing including: first seat surfaces arranged on a bottom surface of the casing to mount a first deflection portion that includes a first rotary polygon mirror, a first motor, and a first board on which the first rotary polygon mirror and the first motor are fixed; and second seat surfaces arranged on the bottom surface to mount a second deflection portion that includes a second rotary polygon mirror, a second motor having a maximum number of revolutions higher than that of the first motor, a second board on which the second rotary polygon mirror and the second motor are fixed, and a mounting portion supporting the second board, wherein at least one of the second seat surfaces is arranged outside of a region formed by connecting the first seat surfaces.