<PAGE>

                                                                    EXHIBIT 4.22

                               DEED OF ASSIGNMENT

This Deed of Assignment (the "Deed") is entered into as of the day of September
2004 by and between

NAMTAI ELECTRONIC (SHENZHEN) CO., LTD., a company existing and incorporated
under the laws of the Peoples' Republic of China ("PRC") with registered address
at Gu Su Industrial Estate, Xixiang, Baoan, Shenzhen, PRC (the "ASSIGNOR"); and

NAM TAI ELECTRONICS, INC., an International Business Company incorporated in the
British Virgin Islands, in accordance with Part V, Section 51 of the
International Business Companies Ordinance, 1984 (the "ASSIGNEE").

WHEREAS,

1.    The Assignor is the registered owner in PRC of trademark numbers 3465621
      and 3465622, particulars of which are set out in the Schedule hereto
      ("TRADEMARKS"); and

2.    The Assignor desires to assign to the Assignee all the property, right,
      title and interest in and to the Trademarks in accordance with the terms
      and conditions of this Deed.

NOW THIS DEED WITNESSES AND IT IS AGREED as follows:

1.    Assignment of Rights

      The Assignor hereby assigns and transfers to the Assignee all of its
      property, right, title and interest in and to the Trademarks, and the
      Assignee hereby accepts such assignment (the "ASSIGNMENT").

2.    Effective Date

      Subject to approval of the Assignment by the Trademark Office of PRC, the
      Assignment shall take effect from the date of publication of the approval
      of the Assignment.

3.    Undertaking by Assignee

      The Assignee hereby undertakes to the Assignor that all goods pursuant to
      which the Trademarks are licensed to be used shall conform to the
      standards
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      of quality and specifications as laid down by the Assignor.

4.    Miscellaneous

4.1   This Assignment constitutes the entire agreement between the parties
      hereto with respect to the subject matter hereof and supersedes any
      previous expression of intent, undertaking or agreement with respect to
      this transaction.

4.2   This Assignment may be executed in any number of counterparts and by the
      parties to this Assignment on separate counterparts, each of which when
      executed and delivered shall be an original but all the counterparts shall
      together constitute one and the same instrument.

5.    Governing Law

      This Assignment shall be governed by and construed in accordance with the
      laws of PRC.

EXECUTED as a deed under seal by the parties.

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                                  THE SCHEDULE

PRC

<TABLE>
<CAPTION>
                                                 Goods and Services in
                                                 respect of which the
Trademark            Registration Number  Class  Trademarks are registered
---------------      -------------------  -----  -------------------------
<S>                  <C>                  <C>    <C>
Namtai & device
(English)            3465622              9      Calculators, electronic
                                                 dictionaries, video camera,
                                                 digital camera, batteries,
                                                 headphone, connector
                                                 (data processing
                                                 equipment), computer,
                                                 reader (data processing
                                                 equipment), mobile phone,
                                                 peripheral products of
                                                 computers, interface of
                                                 computers

Namtai & device
(Chinese)            3465621              9      Calculators, electronic
                                                 dictionaries, video camera,
                                                 digital camera, batteries,
                                                 headphone, connector
                                                 (data processing
                                                 equipment), computer,
                                                 reader (data processing
                                                 equipment), mobile phone,
                                                 peripheral products of
                                                 computers, interface of
                                                 computers
</TABLE>

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SIGNED SEALED AND DELIVERED)
by Wong Kuen Ling                               )
as the lawful attorney of                       )
Namtai Electronic (Shenzhen) Co., Ltd.          )

Witnessed by:

___________________________________________
Name:
Title:

Signed by                                       )
For and on behalf of                            )
Nam Tai Electronics, Inc.                       )

Witnessed by:

___________________________________________
Name:
Title: