IVM06A300X200X0.4 TDK Corporation, IVM06A300X200X0.4 Datasheet - Page 10

• Manufacturer Part Number: IVM06A300X200X0.4
• Description: EMI/RFI Suppressors & Ferrites 300 X 200 X 0.4 mm
• Manufacturer: TDK Corporation

Specifications of IVM06A300X200X0.4

• Dimensions: 200 mm W x 300 mm L x 0.4 mm H
• Shielding: Shielded
• Product: Absorber Sheets & Tiles
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Example of an optical pickup's countermeasure
against unnecessary radiation
The data shown here are examples of in-house meas-
urement and may not coincide with performance in
other situations.
Many optical pickup units used in DVD players,
and the like, drive laser diodes using a super-
posed 400MHz high-frequency electric direct
current. This superposed electrical current in-
cludes high-frequency elements reaching GHz
areas, which may run the risk of radiation of
strong, high-frequency noise from the FPC and
circuit boards, depending on the pattern posi-
tion of the power source line and the grounding
method.
The following example shows the effectiveness
of a countermeasure using the test drive circuit
where a DVD/CD optical pickup unit is driven in
the DVD mode. The IR02 material, which has a
superb noise absorption characteristic between
100MHz and 10GHz was used. Its adhesive 0.05 -
thick sheet was cut 10mm wide and wrapped
around the end of the FPC once on the optical
pickup side.
As a result, the higher harmonic wave elements
often seen in GHz bands were reduced by 6-7dB
(13dB in 1GHz area) in a wide range of frequen-
cies, as were the basic waves.
IRL02
T:0.05mm
W10mm
Test circuit board
High-frequency superposed module installed in an optical pickup
TDK CORPORATION
IRL, IRJ, IVM,
IRB, IRE
Initial condition
With Flexield
9
90
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
300
300
BACK
Horizontal (3m)
Horizontal (3m)
5.4dB
materials
NEXT
11
7.4dB
Frequency (MHz)
Frequency (MHz)
1000
1000
IRL, IRJ, IVM, IRB, IRE
13.1dB
6.6dB
4.9dB
3000
3000
3.4dB
4.7dB
10
6000
6000