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JPH01295576

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DESCRIPTION JPH01295576
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
television receiver for pivoting a speaker box disposed so as to be rotatably housed on the side of
a cabinet. (B) Conventional Technology Recent TVs are required to have high image quality and
high sound quality. For example, a TV that can change the sound field (how the sound is spread)
of the sound from the TV is required. For this reason, the applicant of the present invention
previously accommodated as the Japanese Utility Model Application Publication No. 61-175706
a television in which the speaker box can be rotatably stored on the left and right sides of the
cabinet of the television receiver and the speaker box can be separated from the cabinet. We
proposed a receiver. Although the speaker box of this television receiver is manually operated
and rotated to a predetermined angle, it is not only difficult to set the speaker box to an optimum
angle at a position to be actually watched because it is manual, When the viewing position shifts,
it is necessary to manually rotate the speaker box accordingly, which is very time-consuming. (C)
Problems to be Solved by the Invention The present invention has been made in view of the
above points, and has made it possible to change the angle of the speaker box so that the viewer
can listen to the optimum voice at the viewing position. It is intended to propose a TV receiver.
(D) Means for Solving the Problem To solve the above-mentioned problem, the remote control
device remotely controls the drive device for rotating the speaker box provided in the TV
receiver. At this time, the control circuit for controlling the drive unit for rotating the speaker
holder activates the drive unit during the pressing period of the control signal transmission key
of the remote control transmitter and opens and closes the speaker by an angle proportional to
the pressing time. At the same time, the driving device is made inoperable when the pressing
period changes for a fixed time. Further, as a mechanism for driving the speaker box, a guide
long groove is provided on the bottom surface of the speaker box, and the speaker box is
rotatably pivoted on the side of the cabinet, and the rotation direction is controlled by the remote
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control device. A crank pin, which is attached to the rotation shaft of the motor and protrudes in
the direction of the rotation shaft at a position shifted with respect to the center of the rotation
shaft, is fitted into the guide long groove. (E) Operation As described above, since the speaker can
be rotated by the remote control device, the viewer can listen to the optimum sound at the
viewing position. Further, when the pressing time of the control signal transmission key of the
remote control transmitter exceeds a predetermined time, the rotation of the speaker box is
stopped, so that the motor is not overloaded.
Further, the speaker box is rotationally driven by a crank pin connected to the rotation shaft of
the motor sliding in a long groove provided on the bottom surface of the speaker box. The first
embodiment of the present invention will be described with reference to FIGS. 1 to 9. FIG. 2
shows an external perspective view of a television (TV) receiver according to the present
invention. In FIG. 2, (1) is a TV receiver main body. A light receiving window (3) for receiving an
infrared signal from a remote control transmitter (hereinafter referred to as rRC transmitter) (2)
and a power button (4) are provided on the front of the main body (1). In addition, speaker boxes
(6) and (6) are pivotally supported on the left and right side surfaces (5) [-side surface is not
shown] of the main body (1). Then, as shown in FIG. 1, the speaker box (6) (6) is rotated by the
control signal from the RC transmitter (2) from the storage state by the maximum angle (α)
around the spindle (7). It is supposed to be. Note that (8) is a Braun tube, and the speaker boxes
(6, 6) are housed in the space formed on the back of the funnel of the Braun tube (8) and the
inner surface of the cabinet (9). The system for rotationally driving the speaker box (6 ·) by the
RC transmitter (2) as described above is as shown in the block diagram of FIG. That is, the RC
transmitter (2) has an open (key) switch (2a) for generating a control signal for rotating the
speaker box (6) (6) in the forward direction (open direction), and a reverse direction (close
direction And a close (key) switch (2b) for generating a control signal for rotating the switch. On
the other hand, on the TV receiver main body (1) side, a remote control receiver (hereinafter
referred to as "RC receiver") (10), a control signal detection circuit (11) and a forward / reverse
rotation drive signal generation circuit (12) And a motor (13) and a timer circuit (14). The RC
receiver (10) receives a control signal from the RC transmitter (2) and supplies it to the control
signal detection circuit (11). The detection circuit (11) decodes this to open and close. It is
detected which switch is pressed and the output is applied to the forward / reverse rotation drive
signal generation circuit (12). The forward and reverse rotation drive signal generation circuit
(12) rotates the motor (13) according to the output of the detection circuit (11) [in response to
the pressure of the open or close switches (2a) and (2b)]. The speaker box (6) is rotated by the.
By the way, although the above speaker box (6) is pivoted within the range of the maximum
projection angle (α) as shown in FIG. If the open or close switch is continuously pressed and the
motor (13) is driven and controlled despite the fact that the rotation of the box (6) is further
prevented, the load on the motor (13) increases. Not desirable.
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Therefore, in the present invention, in order to prevent such overload of the motor (13), a timer
circuit (14) as shown in FIG. 3 is provided, and the control signal detection circuit (11) detects
the control signal. After a timer circuit (14) comprising a counter counts for a fixed time (for
example, 10 seconds), a signal is generated to deactivate the drive signal generation circuit (12).
FIG. 4 is a timing chart for explaining the operation of such a timer circuit (14). If the open
switch of the RC transmitter (2) is kept pressed for 10 seconds, for example, the speaker box is
completely closed. It is assumed that the speaker box (6) is completely closed and the open
switch (2a) is kept pressed for 20 seconds from the completely closed state, and the control
signal [FIG. 4 (A)] becomes as shown in FIG. Considering the case where the signal is output for
20 seconds (to) to (t2), the rotational drive signal [FIG. 4 (c) is generated and the timer circuit
(14) starts counting at time (10). Then, when 10 seconds have elapsed (tl), the output (H level) of
the timer circuit (14) [The drive signal is extinguished by the timer circuit (14) regardless of the
presence of the control signal, and the motor ( 13) Rotation is stopped. According to such a
configuration, for example, the close switch or the open switch continues to be pressed by the
RCC transmitter 2) in the completely closed state or the completely open state of the speaker box
(6). Since the drive device is stopped after a predetermined time has elapsed, the motor (13) can
be prevented from being overloaded. The circuit configuration in FIG. 3 is specifically configured
as shown in FIG. That is, in FIG. 5, (2) is an RC transmitter, (10) is an RC receiver, (15) is a
microcomputer [Mitsubishi Electric (m: M50439-528SP), (16) is a motor drive IC [Sanyo Electric
(拗: LB 16413, (13a) is a motor for driving the left speaker box, (13b) is a motor for driving the
right speaker box. The control signal detection circuit (11), the timer circuit (14), and the forward
and reverse rotation drive signal generation circuit (12) of FIG. 3 are the microcomputer (15) and
the motor (13) is the motor drive IC (16). And the motors (13a) and (13b). FIG. 6 shows a
flowchart corresponding to the program of the microcomputer (15), and the circuit operation of
FIG. 5 will be described with this flowchart. An open or close signal is sent from the RC
transmitter (2), and the RC receiver (10) receives it and supplies it to the terminal (5) of the
microcomputer (15), which is now received by the microcomputer (15). It is determined whether
the signal is an open signal or a close signal.
If the received signal is a close signal, the timer is incremented by +1. Since the microcomputer
(15) outputs a close signal from the terminal [stock] to the terminal (1) of the IC (16) if it does
not overflow (more than 10 seconds) as a result of counting up, the motor (13a) (13b) The
speaker box (6) rotates in the closing direction. When such an operation is repeated and the
timer count value overflows, the microcomputer (15) does not supply a close signal from the
terminal (1) to the terminal (1) of the IC (16). As a result, the rotation of the motors (13a) and
(13b) is stopped. Similarly, when the open signal is output from the RC transmitter (2), if the
timer counter does not overflow, the open signal from the terminal [phase] of the microcomputer
(15) to the terminal 1 of the IC (16) If the motor (13a) (13b) is rotated forward and the timer
counter overflows, the motor (13a) (13b) is stopped without supplying the open signal to the
terminal (3). When the RC signal is not received, the timer of the microcomputer (15) is cleared
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and the supply of both the open and close signals is stopped, and the motors (13a) and (13b) are
stopped. Next, the speaker box drive mechanism will be described with reference to FIGS. 7 to 9.
In FIG. 7, (20) is a base provided in the cabinet (9) of the TV receiver, and (21) is a stopper base
fixed to the base (20) by screwing or bonding. The stopper base (21) is provided with a support
shaft (22) and a stopper pin (23). (24) is a speaker box drive device, and the drive device (24) has
a drive base (25) fixed to the screw (26) (26) (see FIG. 8). 26) fixed in the cabinet (9). A support
shaft (27) is disposed coaxially with the support shaft (22) on the drive base (25). (28) is a motor
corresponding to FIG. 3 (13) fixed by the drive base (25) and the screws (29) (29). The rotary
shaft (30) of the motor (28) is disposed so as to project in the same direction as the support shaft
(27), and a pulley (31) shown in FIG. 1 is attached. (32) is a second pulley. (33) is an intermediate
gear. The intermediate gear (33) is formed by integrally molding a large diameter gear (33a) and
a small diameter gear (33b).
(34)はクラン・クギアである。 The second pulley (32), the intermediate gear (33) and the
crank gear (34) are connected to the drive base (25) by the second pulley shaft (35), the
intermediate gear shaft (36) and the crank gear shaft (37). It is attached rotatably. The rotation
of the motor (28) is transmitted from the first pulley (31) to the second pulley (32) by a belt (38)
stretched around the first pulley (31) and the second pulley (32). The second pulley (32) is
integrally provided with a pulley gear shaft (39) centered on the second pulley shaft (35) and
smaller in diameter than the outer diameter of the second pulley (32), The gear shaft (39)
meshes with the large gear (33a) of the intermediate gear (33). The small diameter gear (33b) of
the intermediate gear (33) meshes with the crank gear (34). That is, the first stage of rotation of
the motor (28) is decelerated by the first pulley (31), the belt (38) and the second pulley (32),
and the pulley gear shaft (39) and the intermediate gear (33) The second gear is decelerated by
the large gear (33a), and the third gear is decelerated by the small gear (33b) of the intermediate
gear (33) and the crank gear (34). (40) and (40) are E-links for stopping the removal of the gear.
A rib (41) and a cylindrical pin receiver (42) connected to the rib (41) are integrally formed on
the upper surface of the crank gear (34), and the pin receiver (42) is cylindrical A crank pin (43)
is rotatably fitted. On the upper and lower surfaces of the speaker box (6), fulcrum bosses (44)
and (45) to which the support shafts (22) and (27) are respectively fitted are provided. By this
fitting, the speaker box (6) 9) Pivoted to the side. The upper surface of the speaker box (6) is
further in contact with a stopper pin (23) and a first stopper piece (46) for restricting the
rotational position of the box (6) in the opening direction, and the stopper pin (23) A long groove
(48) is integrally formed with a second stopper piece (47) for restricting the rotational position in
the closing direction of the box (6), and the crank pin (43) is slidably fitted on the lower surface
Are integrally formed. Now, assuming that the speaker box (6) is completely closed, as shown in
FIG. 8, when the motor (28) rotates in the positive direction (direction of arrow A), the crank gear
(34) rotates in the direction of arrow A. The crank pin (43) moves in the long groove (48) while
rotating from the point (a) to the point (b), and the speaker box (6) moves at the maximum angle
(β) around the support shaft (27) However, this causes the speaker (50) mounting surface (6a)
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to project an angle (α) from the side surface (9a).
In addition, when the speaker box (6) is stored, the operation is performed by the reverse
operation to the above. The maximum pivoting angle (β) and projecting angle (α) of the speaker
box (6) are obtained by the stopper pins (23) coming into contact with the first and second
stoppers (46) and (47) as shown in FIG. Although it is determined, if there is no stopper pin (23)
and the first and second stoppers (46) and (47), it is determined by the distance in the
longitudinal direction of the guide long groove (48). The crank pin (43) can be rotated to reduce
friction so that the crank pin (43) can slide smoothly in the guide long groove (48). By the drive
mechanism as described above, the rotation of the motor (28) is appropriately decelerated, and
the speaker box (6) is rotated at the optimum speed. By the way, since the driving force by the
motor (28) is transmitted to the speaker box (6) through the gear as described above, rattling
occurs in the thrust direction and the radial direction. In particular, play in the radial direction is
greater due to gear backlash and the like. The vibration due to these rattles is transmitted
through the support rotation mechanism of the speaker box to vibrate the shadow mask of the
cathode ray tube, and is used to generate an abnormal screen. In addition, parts in the television
receiver vibrate to generate noise such as chatter. In order to prevent these, it is necessary to
eliminate the play. The structure for this will be described with reference to a second
embodiment shown in FIGS. In FIGS. 10 to 15, the same parts as those in FIGS. 1 to 9 are denoted
by the same reference numerals. In this second embodiment, the speaker box (6) is forcibly
loaded in the radial direction and the thrust direction by a compression screw spring (50)
(hereinafter referred to as a spring) shown in FIG. The second spring (50) has both compression
and torsion effects. As shown in FIG. 10, the center annular portion of the spring (50) is disposed
around the fulcrum boss (44) of the speaker box (6) and the spindle (22) fitted thereto. The free
height of this spring (50) at no load is shown in FIG. 13 (H), and this spring (50) is disposed
between the stopper base (21) and the speaker box (6). It is compressed. For this reason, the
compression load □ is applied in the Y direction (radial direction) of FIG. 13 by the spring (50),
and rattling in this direction is prevented. The load of this spring (50) prevents backlash. That is,
the vibration generated when sound is emitted from the speaker is absorbed by a slight load
from the top to the bottom by the spring.
As shown in FIGS. 11, 12, and 14, both ends of the spring (50) are hooked on the stopper piece
(47) of the speaker box (6) and the spring hook of the mounting base (21). . As a result, the
spring (50) is twisted, so a slight load is applied in the Z direction in FIG. The load in the Z
direction prevents rattling in the radial direction. That is, as shown in FIG. 15, radial clearance is
generated due to the clearance between the crank pin (43) and the long groove (48) or the
backlash due to the engagement of the gears (33) and (34). However, a load is applied by the
spring (50) in this radial direction (two-direction twisting direction), and the crankpin (43) is
pressed against one of the inner walls of the long groove (48) to prevent backlash, Backlash does
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not cause backlash because the meshing between the gears is biased in a predetermined
direction. The load in the radial direction also has the function of absorbing the vibration when
the speaker sound is generated. The load by the spring (50) is set to a load value that does not
adversely affect the rotation of the speaker box (6). In fact, I attached various springs and tried.
As described above, according to the television receiver of the present invention, since the
rotation angle of the speaker box can be remotely controlled at the viewing position, the viewer
can listen to the optimum sound at the viewing position. In addition, since the rotation of the
speaker box is stopped when the pressing time of the control signal transmission key of the
remote control transmitter exceeds a certain time, it is possible to reduce the overload state
applied to the motor for driving the speaker box. Further, the speaker box can be effectively
rotated by the motor according to the drive mechanism of the present invention.
[0002]
Brief description of the drawings
[0003]
1 to 9 relate to the first embodiment of the present invention, and FIG. 1 is a cross-sectional view
of the main part of a television receiver, FIG. 2 is an external perspective view of the same, and
FIG. 3 is a television according to the present invention. Fig. 4 is a circuit block diagram of the
receiver, Fig. 4 is an operation explanatory diagram thereof, Fig. 5 is a diagram showing a
specific circuit configuration thereof, Fig. 6 is a diagram showing a flowchart for describing its
operation, Fig. 7 An exploded perspective view showing a speaker box driving device groove of a
television receiver embodying the present invention, and FIGS. 8 and 9 are operation explanatory
diagrams thereof.
10 to 15 relate to the second embodiment of the present invention, FIG. 10 is an exploded
perspective view, FIG. 11 is a perspective view around a spring, FIG. 12 is a side view from the
direction of FIG. 13 is a view for explaining attachment of a spring, and FIGS. 14 and 15 are
views for explaining rotation. (2) ... remote control transmitter, (6) ... speaker box, (9) ... cabinet,
(10) ... remote control receiver, (11) ... control signal detection circuit, (12) ... forward / reverse
drive signal generation circuit, (13) ... motor, (14) ... timer circuit, (43) ... crank pin, (48) ... guide
long groove, (50) ) ... spring.
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