JP3222740B2 - Monitor television equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor television apparatus used for a main unit of a television intercom or the like.

[0002]

2. Description of the Related Art A monitor television apparatus used for a main unit of a television intercom is disclosed in JP-A-7-142011.
There is something shown in the issue. In this monitor television device, a flat CRT is used as a monitor CRT in order to reduce the thickness of the device main body. However, in order to reduce the size of the entire device, the flat CRT and a circuit unit such as a power supply unit are narrow. Was stored inside.

[0003]

In the prior art configuration as described above, the magnetic flux of the transformer Tr of the power supply unit 5 composed of a switching power supply has a deflection yoke provided on the neck 3 of the flat CRT 2 as shown in FIG. As a countermeasure against the problem that noise is mixed into the image projected on the monitor flat cathode ray tube 2 by adversely affecting the monitor 4 and the image quality is reduced,
As shown in FIG. 11, the power supply unit 5 is arranged at a position as far as possible from the deflection yoke 4 of the neck portion 3 of the flat cathode ray tube 2, and the heat radiation plate 6 provided for heat radiation of the heating element of the power supply unit 5 is raised. The magnetic flux from the transformer Tr is prevented from affecting the deflection yoke 4.

However, in such a configuration, a wasteful space is created between the power supply unit 5 and the flat CRT 2, and the apparatus main body 7 for accommodating them has a large size.
Therefore, there is a problem that the apparatus main body 7 becomes thicker because the height of the device body 7 is increased. In addition, since the front side of the power supply unit 5 is open, when the device body 7 is made thinner, the height of the heat radiating plate 6 cannot be sufficiently increased, so that there is a problem that a shielding effect cannot be expected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the thickness and size of a device main body while preventing the adverse effect of magnetic flux from a power supply unit from reaching a flat CRT. Of large parts of the power supply
Long enough to provide sufficient shielding effect regardless of position
Another object of the present invention is to provide a monitor television device that can determine the length of the heat sink .

The object of the invention of claim 2 is that in addition to the object of the invention of claim 1, the shielding effect is higher.
A monitor television device is provided.

[0007]

According to the first aspect of the present invention, there is provided a monitor flat CRT for displaying an image picked up by an image pickup camera, and a power supply unit having a heat sink. In a monitor television apparatus housed in the main body of the apparatus, a power supply section is arranged in parallel with a deflection yoke of a flat cathode ray tube for monitoring, a partition between the power supply section and the deflection yoke is provided, and a front section of the power supply section is covered. The heat sink is arranged so that the heat sink is parallel to the deflection yoke.
It is characterized by opening both ends in the direction of
Even if the distance between the power supply and the deflection yoke is reduced, the magnetic flux generated by the transformer in the power supply can prevent the deflection yoke from being adversely affected by the shield effect of the heat sink. Since the front side is covered with the heat radiating plate, the shielding effect is not impaired even if the height of the heat radiating plate is reduced, so that the thickness of the apparatus main body can be reduced and the size can be reduced. Furthermore, the direction parallel to the deflection yoke
Both ends of the heatsink are open, so the size of power supply
The length of the heat sink can be determined regardless of the arrangement.

According to a second aspect of the present invention, in the first aspect of the present invention, the heat radiation plate is extended to the vicinity of the face portion of the monitor flat CRT, so that the shielding effect is further enhanced .

[0009]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the present embodiment, the monitor television apparatus according to the present invention is applied to the door phone master unit of the intercom system with a monitor television shown in FIG. Therefore,
First, the configuration and operation of the intercom system with a monitor television will be briefly described.

In the door phone system shown in FIG. 10, a door phone slave unit I disposed at the entrance of a house or the like and a door phone master unit II installed indoors of the house are connected by two signal lines L. It is composed. The intercom handset I includes an imaging camera T having a CCD image pickup device, a microphone M for collecting a visitor's voice, a speaker S for generating a resident's voice transmitted from the intercom master unit II, and an intercom. A call button 30 for calling the parent device II is provided.

On the other hand, the door phone master unit II includes a monitor flat CRT 2 for displaying an image of the imaging camera T sent from the door phone slave unit I via the signal line L, and a voice of a resident in the house. The call function between the microphone M ₀ that collects sound, the speaker (indicated by S ′ in FIG. 5) that emits the voice of the visitor transmitted via the signal line L, and the door phone handset I is turned on. It comprises a call button unit 31 to be turned off, and a monitor switch unit 32 for displaying only the image of the imaging camera T on the flat cathode ray tube 2 while the call function is turned off, and these are formed in a substantially box-shaped synthetic resin. It is housed in an apparatus main body 7 made of a product. The door phone master unit II is provided with a power supply connection terminal for connecting to an external commercial 100 V power supply and a connection terminal for connecting the signal line L.

Next, the operation will be described. First, when the visitor operates the call button 30 of the door phone slave unit I, the door phone slave unit I activates the imaging camera T to image the visitor, and the video signal and the calling signal are transmitted via the signal line L to the door phone. Transmitted to Master Unit II. The door phone master unit II displays a visitor on the screen of the monitor flat CRT 2 based on the received video signal and drives the speaker S 'to generate a ringing tone. When a resident in the house presses the call button 31 to answer the ringing tone, the door phone master unit
The call function via the signal line L between the II and the intercom slave unit I is turned on, and thereafter the call function is kept on until the call button unit 31 is pressed again. When the call function is on, the intercom slave unit I and the intercom master unit II
Means microphones M and M ₀ and speakers S and S ′, respectively.
And the video of the imaging camera T from the intercom slave unit I is displayed on the screen of the flat CRT 2 of the intercom master unit II. Here, the power of the intercom slave unit I is supplied from the intercom master unit II via the signal line L. In order to transmit the video signal, the audio signal, the calling signal, and the power of the intercom slave unit I through the two signal lines L, for example, an audio signal or the like may be superimposed on the video signal. Detailed description is omitted because it can be realized by technology.

Next, the configuration of this embodiment will be described. As shown in FIGS. 1 to 9, the apparatus main body 7 includes a base 10 and a cover 11 attached to the base 10 and fixed with screws with fixing screws 33 inserted from the base 10 side. A flat CRT 2, a power supply unit 5, a main printed circuit board 12 on which circuits necessary for the door phone master unit I such as a communication circuit for an interphone are mounted, a printed circuit board 20 on which a television circuit is mounted, and a monitor switch unit 32, A printed circuit board 21 on which a switch and the like of a call button unit 31 are arranged is housed. On the front side of the main printed circuit board 12, the monitor flat CRT 2 is provided integrally with the ribs 13 and 14 standing upright from the bottom surface of the base 10, and 15 so as to be supported.

The main printed circuit board 12 is fixed to the base 10 by being supported by ribs 16 formed on the bottom surface of the base 10, penetrating the ribs 13, and being restrained on the front side by locking claws 17 provided at the ends thereof. . Main printed circuit board 12
1 constitutes a switching power supply and is shown in FIG. 1 (and FIGS. 2 and 9) in parallel with the neck 3 of the flat CRT 2 arranged on the front side of the main printed circuit board 12. It is located at the lower right corner of the printed circuit board 12 as shown. A heat radiating plate 6 made of a metal plate attached for heat radiation of the heat-generating element 18 of the power supply unit 5 is bent to have an L-shaped cross section as shown in FIG. And the other piece 6b is disposed so as to cover the front side of the power supply unit 5 to prevent the magnetic flux of the transformer Tr provided in the power supply unit 5 from leaking forward.

Further, it is electrically connected to the ground pattern of the main printed circuit board 12 and is grounded. Therefore, the heat radiating plate 6 functions as an electromagnetic shield for shielding the magnetic flux generated from the transformer Tr of the power supply unit 5 and prevents the magnetic flux generated from the transformer Tr from affecting the deflection yoke 4 of the flat CRT 2. . In particular, since the magnetic flux leakage to the front side of the power supply unit 5 can be prevented by the piece 6b, the size of the heat radiating plate 6 in the front-rear direction can be reduced, thereby contributing to the reduction in the thickness of the apparatus body 7. Further, since the upper side of the heat radiating plate 6 is opened, the dimension in the longitudinal direction can be extended so as to cover the smoothing capacitor 19 which is a large component of the power supply unit 6. For example, the upper end is extended to the vicinity of the face portion 2 a of the flat CRT 2. By extending, it is possible to reliably prevent the magnetic flux of the transformer Tr leaking from the upper end side from affecting the deflection yoke 4.

The face portion 2A of the flat CRT 2 housed in the apparatus main body 7 faces the glass window 22 opened on the upper surface of the cover 11, so that an image projected on the face portion 2A from the outside of the apparatus main body 7 can be viewed. It has become. The printed circuit board 20 on which the television circuit is mounted is arranged along one side wall of the apparatus main body 7, and is electrically connected to the main printed circuit board 12 by a cable (not shown).

A speaker S 'fixed so as to be sandwiched between the cover 11 and the body 10 and operation knobs 25 and 26 for adjusting the contrast and the like of a monitored image are provided at a lower portion of the apparatus main body 7. ing. On the rear surface of the body 10, there are provided a power connection terminal 27 for power connection and a connection terminal 28 for connecting the signal line L and an additional speaker. A mounting bracket 29 for mounting on a wall surface or a switch box is detachably mounted.

On the lower front surface of the cover 11, a push button 31a constituting the call button section 31 is provided swingably.
A printed circuit board 21 on which a switch 31b and the like driven by a pressing operation of a push button 31a are mounted on the back side of 1a. The printed circuit board 21 has a switch 32b driven by a push button 32a of the monitor switch unit 32, and a light emitting diode for illuminating the pictogram 24 of the push button 32a. The tubular mounting portion 2 for mounting by fitting the microphone M ₀ is on the side of the cover 11
3 is provided.

[0019]

According to a first aspect of the present invention, there is provided a monitor television apparatus in which a monitor CRT and a power supply are housed in a main body of the apparatus, wherein a power supply is provided near a neck portion of the monitor flat CRT provided with a deflection yoke. A radiator plate which is arranged in parallel with the neck portion, and has a piece for separating the power supply section and the deflection yoke and a piece for covering the front face of the power supply section on the heat radiating plate for the heating element attached to the power supply section. The shield also serves as a shield, so the configuration is such that the power supply section is arranged near the neck section where the deflection yoke of the monitor flat cathode ray tube is provided so as to be parallel to the neck section, and the distance between the power supply section and the neck section is reduced. The heat sink can prevent radiation noise from the power supply from jumping into the deflection yoke of the flat CRT monitor, and the front side of the power supply is covered with the heat sink. Without impairing the field effect, therefore it is possible to reduce the thickness of the apparatus main body, also has the effect of miniaturization is possible. In addition, the deflection yoke
Since both ends of the heat sink in the parallel direction were opened, the power supply
The length of the heat sink regardless of the position of large parts
There is an effect that can be.

According to a second aspect of the present invention, in the first aspect of the invention, the heat radiation plate is extended to the vicinity of the face of the monitor flat CRT, so that the shielding effect is further enhanced .

[Brief description of the drawings]

FIG. 1 is a front view of a main printed circuit board according to an embodiment of the present invention.

FIG. 2 is an explanatory view of an arrangement relationship between a flat CRT and a power supply unit according to the first embodiment.

FIG. 3 is a front view of the same.

FIG. 4 is a rear view of a cover of the apparatus main body of the above.

FIG. 5 is a horizontal sectional view of a main part of the apparatus main body of the above.

FIG. 6 is a horizontal sectional view of a main part of the apparatus main body of the above.

FIG. 7 is a side sectional view of a main part of the apparatus main body of the above.

FIG. 8 is a rear view of the apparatus main body of the above.

FIG. 9 is a front view of the body with the cover removed therefrom.

FIG. 10 is a configuration diagram of a door phone system.

FIG. 11 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 2 Flat cathode ray tube for monitor 12 Main printed circuit board 5 Power supply unit 6 Heat sink 6a, 6b piece

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 7/18 H04N 5/63 H04N 5/64 H05K 9/00

Claims (2)

(57) [Claims] 1. A deflection yoke for a monitor flat cathode ray tube in a monitor television device in which a monitor flat cathode ray tube for displaying an image picked up by an image pickup camera and a power supply unit having a heat radiating plate are housed in an apparatus main body. , A power supply section is arranged in parallel with the power supply section, a heat radiating plate is arranged so as to partition between the power supply section and the deflection yoke, and to cover a front portion of the power supply section, and the heat radiating plate is parallel to the deflection yoke direction
A monitor television device, characterized in that both ends of the device are opened and grounded. 2. The monitor television apparatus according to claim 1, wherein the heat radiating plate extends to a vicinity of a face portion of the monitor flat CRT .