Light Scanning Apparatus Synchronization Detection Optical Path
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Solution Overview
Problem
Conventional light scanning apparatuses face challenges in achieving precise synchronization detection and efficient optical path management, leading to potential interference and increased size, which affects the performance and miniaturization of image forming devices.
Innovation Solution
The light scanning apparatus employs a configuration where the synchronization detection optical system is positioned opposite to the deflecting unit with respect to the housing, using a synchronization detection lens and sensor to improve synchronization accuracy and reduce optical path interference, while utilizing molded lenses and aspherical optical surfaces for enhanced optical performance and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the synchronization detection optical system is arranged on the same side as the deflecting unit, then the optical path management becomes complex and interference increases, but the apparatus size increases
Solution Approach 1:
The patent applies dimensional reconfiguration by moving the synchronization detection optical system from the same side as the deflecting unit to the opposite side, utilizing the space on both sides of the deflecting unit's rotational axis. This spatial rearrangement in a different dimension (from radial to axial positioning) reduces optical path interference while maintaining compact overall apparatus dimensions.
Solution Approach 2:
The optical system is segmented into separate functional zones: the deflecting unit occupies the central rotational position, while the synchronization detection optical system is positioned in a separate zone on the opposite side. This segmentation allows independent optimization of each subsystem's optical path without mutual interference, improving detection accuracy without proportionally increasing apparatus volume.
2Measurement precision
If conventional optical elements are used for synchronization detection, then the optical path is longer and more complex, but the precision is insufficient
Solution Approach 1:
The synchronization detection function is extracted as a separate optical system positioned independently from the main scanning optical path. By taking out the synchronization detection optical elements (lens and sensor) and placing them on the opposite side of the deflecting unit, the patent creates a dedicated detection path that is shorter and less complex than conventional integrated designs, while achieving higher precision through specialized optical configuration.
3Volume of stationary object
If the apparatus is miniaturized, then the optical paths become more crowded and interference increases, but performance is maintained
Solution Approach 1:
The patent utilizes the axial dimension (opposite sides of the deflecting unit) to separate optical paths that would otherwise be crowded in the radial plane. This dimensional approach allows compact miniaturization while maintaining sufficient separation between the scanning optical path and synchronization detection path, preventing optical interference even in a reduced-size apparatus.
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 enhances synchronization accuracy, reduces the size of the apparatus, and improves optical performance by minimizing interference and allowing for a more compact design suitable for image forming devices.
Implementation Method 1
a deflecting unit (50) configured to deflect a first light flux (LA) to scan a first scanned surface (100a) in a main scanning direction
Implementation Method 2
a first optical element (200) configured to guide the first light flux (LA) deflected by the deflecting unit to the light receiving element
Implementation Method 3
a first imaging optical system (85a) configured to guide the first light flux (LA) deflected by the deflecting unit to the first scanned surface (100a)
Data Source
AI summary
A light scanning apparatus according to the present embodiments includes a deflecting unit configured to deflect a first light flux to scan a first scanned surface in a main scanning direction, a first imaging optical system configured to guide the first light flux deflected by the deflecting unit to the first scanned surface, a light receiving element configured to receive the first light flux deflected by the deflecting unit without the first imaging optical system, a first optical element configured to guide the first light flux deflected by the deflecting unit to the light receiving element, and a holding member configured to hold the deflecting unit, the first imaging optical system, the light receiving element and the first optical element, in which the first optical element and the deflecting unit are arranged on sides opposite to each other with respect to a first surface of the holding member.