Noise suppressing device, image reading device, and image forming apparatus

• US 9,742,950 B2
• Filed: 02/11/2016
• Issued: 08/22/2017
• Est. Priority Date: 09/24/2015
• Status: Active Grant

• Current Assignee: Fujifilm Business Innovation Corp. (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Inventors: Asano, Motohiro
• Primary Examiner(s): Worku, Negussie
• Application Number:
  US15/041,724
• Publication Number:
  US 20170094092A1
• Time in Patent Office: 558 Days
• Field of Search: 358498, 358474, 358497, 358 113, 358496, 358 112, 358401
• CPC Class Codes: H04N 1/0083 Arrangements for transferring signals between different components of the apparatus, e.g. arrangements of signal lines or cables for control or supervision between image input and output device H04N1/32
• CPC Class Codes: H04N 1/00933 Timing control or synchronising H04N1/00928, H04N1/00931, H04N1/00954 and H04N1/0096 take precedence
• CPC Class Codes: H04N 1/00994 Compensating for electric noise, e.g. electromagnetic interference
• CPC Class Codes: H04N 1/409 Edge or detail enhancement; Noise or error suppression
• CPC Class Codes: H04N 1/56 Processing of colour picture signals H04N1/52 takes precedence
• CPC Class Codes: H04N 2201/0091 Digital copier; digital 'photocopier' H04N2201/0093 and H04N2201/0094 take precedence

Abstract

A noise suppressing device includes a first circuit board not being grounded; a second circuit board connected to the first circuit board through a transmission line including a signal line that transmits a high-frequency signal and a ground line, the second circuit board including a ground layer being grounded; and a high-frequency reducing element that is arranged between the ground layer of the second circuit board and the ground line of the transmission line and that reduces a high-frequency signal excited at the ground line of the transmission line.

Claims

1. A noise suppressing device comprising:

a first circuit board that is ungrounded;

a second circuit board connected to the first circuit board through a transmission line including;

a signal line configured to transmit a high-frequency signal; and

a ground line,

wherein the second circuit board includes a ground layer that is grounded; and

a high-frequency reducing element that is arranged between the ground layer of the second circuit board and the ground line of the transmission line and that is configured to reduce a high-frequency signal excited at the ground line of the transmission line,

wherein the high-frequency reducing element comprises a high-frequency reducing coil.

2. The noise suppressing device according to claim 1, wherein a frequency of the high-frequency signal is in a range from about 100 MHz to about 1 GHz.

3. The noise suppressing device according to claim 2, wherein the inductance L of the high-frequency reducing element is set, for example, in a range from about 0.1 to about 1 μ

H.

4. The noise suppressing device according to claim 2, wherein the frequency of the high-frequency signal is in a range from 200 MHz to 700 MHz.

5. The noise suppressing device according to claim 1, further comprising a connector connected to the ground line,

wherein the connector comprises a casing, and

wherein the casing is connected to the ground layer through the high-frequency reducing element.

6. An image reading device comprising:

an image reading substrate that is a substrate having mounted thereon an image reading element configured to read an image,

wherein the image reading substrate is ungrounded;

a control substrate connected to the image reading substrate through a transmission line including;

a signal line configured to transmit a high-frequency signals; and

a ground line,

wherein the control substrate includes a ground layer that is grounded; and

a high-frequency reducing element that is arranged between the ground layer of the control substrate and the ground line of the transmission line and that is configured to reduce a high-frequency signal excited at the ground line of the transmission line,

wherein the high-frequency reducing element comprises a high-frequency reducing coil.

7. An image forming apparatus comprising:

the image reading device according to claim 6; and

an image forming section configured to form an image read by the image reading device, on a recording medium.