Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2002-06-14
2004-09-14
Ro, Bentsu (Department: 2837)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S748000, C361S760000
Reexamination Certificate
active
06791824
ABSTRACT:
The present application is based on Japanese Patent Applications No 2001-180916 and No. 2001-180917, which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tape running apparatus used for recording information on and reproducing information from magnetic tape, such as video cassette tape, and to a motor board of a motor for use in the tape running apparatus.
2. Related Art
As shown in
FIG. 5
, a tape running apparatus incorporated into a video cassette recorder (VCR) has a drum motor
102
for rotating a cylinder drum
101
, which holds a magnetic head (not shown), a loading motor
103
for drawing out video cassette tape to the magnetic tape, and a capstan motor
104
for running video cassette tape at a constant speed. These motors
102
,
103
, and
104
are mounted on a common chassis
105
, and supplied with driving power and drive control signals from a recorder-body-side circuit board
106
.
Generally, motor driving ICs
107
and
108
used for driving the capstan motor
104
and the drum motor
102
are mounted on the motor boards
109
and
110
, respectively. A motor driving IC
111
for driving the loading motor
103
is mounted on the circuit board
106
.
The motor board
109
of the capstan motor
104
opposes to the circuit board
106
. Thus, electrical connection is established between this motor board
109
and the circuit board
106
through a pair of inter-board connectors
112
. On the other hand, the motor board
110
of the drum motor
102
does not oppose to the circuit board
106
. Thus, electrical connection is established therebetween through a full flat cable
113
. In this case, full-flat-cable connecting connectors
114
and
115
are mounted on the boards
110
and
116
, respectively. Further, in the case of the loading motor
103
to be driven by using the motor drive IC
111
that is mounted on the circuit board
106
, electrical connection is established between this loading motor
103
and the circuit board
106
through a lead wire
116
with a connector, which is drawn out of the loading motor
103
. In this case, on the circuit board
106
, a receiving side connector
117
for connecting the lead wire thereto is mounted. The connector
118
attached to the lead wire
116
is connected and fixed to this receiving side connector,
However, such an ordinary tape running apparatus needs a pair of inter-board connectors
112
, two connectors
114
and
115
for a full flat cable, a single full flat cable
113
, a single lead wire
116
with a connector, and a single receiving-side connector
117
for connecting the lead wire
116
thereto so as to establish electrical connection between the circuit board and each of the three motors. Thus, such a conventional tape running apparatus has a problem in that the cost for establishing such the electrical connection is high. Moreover, the working voltages of individual motors often differ from one another. Thus, the conventional tape running apparatus has problems in that in such a case, the power cost thereof is expensive, and that the number of devices, such as capacitors, provided around the power supply increases.
To solve such problems, and to reduce the cost and size of the tape running apparatus, in recent years, there has been proposed motor drive ICs each of which is configured by incorporating drive circuits for two motors into a single motor drive IC. For examples, a motor drive IC, into which a motor a drive circuit for a capstan motor and a drive circuit for a loading motor are incorporated, and a motor drive IC, into which a motor a drive circuit for a drum motor and a drive circuit for a loading motor are incorporated, have been proposed.
Further, on a component mounting surface of the motor board, IC lands for soldering lead terminals of a motor drive IC thereonto, and wiring lands for wiring and connecting to external equipment are disposed. Generally, soldering of junction cables which is used for connecting the external equipment thereto to the wiring lands are conducted after the lead terminals of the motor drive IC are soldered to the IC lands.
The wiring cost for establishing electrical connection between the circuit board and each of the motors can be reduced by using such a motor drive IC. Moreover, the number of connectors can be decreased Consequently, such a motor drive IC is considered to be advantageous in downsizing of the tape running apparatus.
However, the amount of heat radiated from the motor drive IC is large, so that countermeasures against heat radiation are necessary. Thus, countermeasures, such as addition of silicone grease and that of a heat sink, are taken. Such countermeasures, however, are unfavorable because of the facts that the cost of the apparatus is increased for those, and that the countermeasures hinder reduction in size of the apparatus.
Further, such a motor drive IC is unfavorable because of the facts that when such a motor drive IC is mounted on the circuit board, the size of the circuit board is increased or the reduction in the size thereof becomes difficult, and that noises due to a switching operation performed in the motor drive IC are superposed on signals in other circuit portions, which are mounted on the circuit board, so that there is fear of adversely affecting picture signals and speech signals.
SUMMARY OF THE INVENTION
In view of such circumstances, an object of the invention is to propose a tape running apparatus enabled to establish electrical connection between a circuit board and each of three motors without increasing the cost of the apparatus, and hindering the reduction in size of the apparatus, and being adversely affected by motor noises.
Further, in the case that the wiring lands and the IC lands are disposed on the component mounting surface of the motor board in such a way as to oppose to each other, unnecessary solder may adhere to a part between the IC lands to which the lead terminals of the motor drive IC are soldered when the junction cable is soldered thereto. Thus, a solder bridge put in a state where a short-circuit is established between the IC lands is apt to be generated. Furthermore, there is possibility that a similar solder bridge is formed between the wiring lands and the IC lands.
It is sufficient for preventing solder bridge that the wiring lands are formed at a distance from the IC lands to which the motor drive IC is soldered. However, the motor board is required to have a limited size. In particular, the recent tendency is shifted to reduce the size of the apparatus. Thus, it is sometimes difficult to place the wiring lands at a sufficient distance from the IC lands. Furthermore, if the IC lands and the wiring lands are not properly disposed, there could be caused adverse effects that places for drawing junction cables to connect the external equipment are limited.
However, in the case of the conventional apparatus, no consideration is given to the placement relation between the wiring lands and these IC lands. Therefore, as matters stand, no proper placement of such lands has been proposed.
Accordingly, in order to adapt downsizing of the apparatus, another object of the invention is to provide a motor board, in which wiring lands are disposed at positions where solder bridge could not be formed among IC lands connected to lead terminals of a motor drive IC or between IC lands and wiring lands when externally connected wiring cables are soldered to the wiring lands, and, where the externally connected wiring cables can be properly drawn around.
To solve the aforementioned problems, according to the invention, there is provided a tape running apparatus having a circuit board, a drum motor, a loading motor and a capstan motor, wherein a motor board of the capstan motor opposes to the circuit board. Further, a motor drive IC into which a drive circuit for the capstan motor, a drive circuit for the drum motor and a drive circuit for the loading motor are incorporated is mounted on the motor board. Furthermore the motor board of
Kokubo Nobuki
Komatsu Izumi
Naito Hayato
Tanimura Satoshi
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