Optical Scanning Device Asymmetric Laser Mounting
Solution Overview
Problem
In optical scanning devices, fitting laser light sources with different angles to a circuit board complicates the manufacturing process and increases the likelihood of electrostatic breakdown and wire bonding issues due to the need for multiple terminal formations and component sorting.
Innovation Solution
The optical scanning device design includes a housing with laser light sources fitted such that only one terminal of each source is bent, allowing for symmetry in angle and reduced component types, with the same component used for both angled positions, simplifying assembly and reducing the number of places requiring terminal formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If laser light sources with different angles are fitted to the circuit board to achieve proper optical alignment, then the scanning function is improved, but the manufacturing complexity increases due to multiple terminal formations and component sorting
Solution Approach 1:
The patent applies asymmetry by configuring laser light sources with different angles relative to the circuit board. Specifically, at least one laser light source is arranged at a different angle than others, allowing each to be fitted with its terminals extending straight without requiring forming operations. This asymmetric arrangement resolves the contradiction by enabling proper optical alignment for each laser source while simplifying the manufacturing process by eliminating the need for terminal forming and component sorting.
2Ease of manufacture
If multiple laser light sources are fitted with terminals extending straight, then the manufacturing process is simplified, but the gap between terminal insertion holes becomes too narrow for copper layer formation
Solution Approach 1:
The patent resolves this contradiction by changing the spatial arrangement in another dimension - specifically by arranging laser light sources at different angles relative to the circuit board. This angular arrangement in the third dimension allows terminal insertion holes to be positioned with sufficient gap for copper layer formation, while still enabling straight terminal extension for simplified manufacturing. The dimensional change transforms a two-dimensional layout problem into a three-dimensional spatial solution.
3Area of stationary object
If terminals of laser light sources are subjected to forming to widen the gap between insertion holes, then copper layer formation is enabled, but the risk of electrostatic breakdown and wire bonding breakage increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the laser light sources at different angles during the design and assembly stage, before the copper layer formation process. This preliminary angular arrangement ensures that terminal insertion holes are positioned with adequate gap for copper layer deposition, eliminating the need for subsequent terminal forming operations. By addressing the gap requirement in advance through geometric arrangement rather than post-processing deformation, the reliability of the laser light sources is preserved.
Data Source
AI summary
An optical scanning device is provided with a housing, a plurality of laser light sources, and a substrate. The laser light sources are attached to a side wall of the housing in a state wherein three terminals are protruding outward. The substrate is disposed to face an outer surface of the side wall of the housing. The laser light sources include: a first laser light source having a predetermined angle with respect to the substrate; and a second laser light source having a symmetrical angle to the angle of the first laser light source with respect to the substrate. In the first laser light source, only one of the three terminals is bent in the direction to be separated from other two terminals, and the second laser light source is disposed by inverting 180° a laser light source having a configuration same as that of the first laser light source.