Duct unit and image formation apparatus

JP2025017272A5Pending Publication Date: 2026-07-10CANON KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
CANON KK
Filing Date
2023-07-24
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Conventional image formation devices face challenges in miniaturization due to the requirement of space for multiple ducts with different lengths and side branches, which complicates the reduction of noise and size.

Method used

A duct unit with a cylindrical body that forms an airflow path, incorporating a sound-absorbing member with multiple layers, including a first layer and a second layer with different sound absorption characteristics, to manage airflow noise and reduce device size.

Benefits of technology

The solution effectively balances miniaturization and airflow noise reduction, allowing for quieter operation in a compact image formation device.

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Abstract

To provide a duct unit that achieves both device miniaturization and noise reduction of airflow sound generated by fan operation.SOLUTION: A sound-absorbing member 850 is placed outside a fan connection duct 710 which is connected to an imaging exhaust fan 410. The sound-absorbing member 850 consists of a perforated plate-shaped member 830 with multiple sound-absorbing holes and a sound-absorbing sheet 815 covering the multiple sound-absorbing holes. By arranging the sound-absorbing member 850, a noise reduction effect of the airflow sound generated by the operation of the imaging exhaust fan 410 is obtained. When a portion of the airflow sound passes through the sound-absorbing holes of the first-layer perforated plate-shaped member 830, a portion of the sound energy is converted into heat energy, and the airflow sound is reduced. Additionally, a portion of the sound energy of the sound that has passed through the sound-absorbing holes is further converted into heat energy by the second-layer sound-absorbing sheet 815, and the airflow sound is further reduced. Furthermore, the sound-absorbing member 850 can be installed in a small space.SELECTED DRAWING: Figure 9
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