(12) United States Patent
`Kaminosono
`
`(10) Patent N0.:
`(45) Date of Patent:
`
`US 6,897,905 B2
`May 24, 2005
`
`US006897905B2
`
`(54) TELEVISION WITH BUILT-IN DVD DEVICE
`
`Inventor; Takeshi Kaminosono, Osaka
`
`(73) Assignee: Funai Electric Co., Ltd., Osaka (JP)
`
`( * ) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 475 days.
`
`JP
`JP
`
`5,718,605 A *
`6,172,712 B1 *
`6,434,326 B1 *
`6,532,004 B1 *
`
`2/1998 Morikawa et al.
`........ .. 439/607
`1/2001 Beard .................... .. 348/552
`
`. . . ..
`8/2002 KOI1d0 CI 211.
`. . . . . .
`.......... .. 345/169
`3/2003 Harrison et al.
`
`FOREIGN PATENT DOCUMENTS
`
`8607783
`11_220680
`
`11/1996
`8/1999
`
`OTHER PUBLICATIONS
`
`(21) Appl. No.: 09/938,230
`
`(22) Filed,
`(65)
`
`Aug_ 23, 2001
`Prior Publication Data
`
`gatentl/abstgregigts of Japan, Publication No. 11—220680, dated
`ug.
`,
`.
`
`Us 2002/0024614 A1 Feb. 28,2002
`
`* Cited by examiner
`
`(30)
`
`Foreign Application Priority Data
`
`..................................... .. 2000—006045
`(JP)
`Aug. 23, 2000
`(51)
`Int. Cl.7 ................................................ .. H04N 5/64
`(52) U.S. Cl.
`...................... .. 348/836; 348/787; 348/794
`(58) Field of Search ............................... .. 348/607, 608,
`348/552, 836, 787, 794; 386/1, 45, 46,
`125, 126; H04N 5/64
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`.
`.
`.
`Primary Exammer—John Miller
`Assistant Em,,,,~,,e,_T1.ang U, Tran
`(74) A”0’”e% Age”) 0’ Fi”"—OSha & May LLB
`(57)
`ABSTRACT
`.
`.
`.
`.
`.
`In a configuration in which a cabinet 1S formed by an
`insulating material, there are provided a filter substrate 3 for
`e ectrica
`connectin
`a
`evice
`to a te evision
`1'1ly
`'g DVDd'
`1
`1"
`circuit substrate 5 and a shielding case 2 for covering the
`DVD device 1 and the filter substrate 3.
`
`5,673,090 A *
`
`9/1997 Higuchi et al.
`
`........... .. 348/836
`
`21 Claims, 3 Drawing Sheets
`
`_-..__..\---—
`
`1 R
`
`EPRODUCING
`DEVICE
`
`FILTER
`
`SUBSTRATE
`
`TELEVISION A
`
`CIRCUIT
`SUBSTRATE
`
`
`
`
`
`
`
`POWER SUBSTRATE
`
`APPLE 1015
`
`APPLE 1015
`
`1
`
`

`
`U.S. Patent
`
`May 24, 2005
`
`Sheet 1 of3
`
`US 6,897,905 B2
`
`2
`
`

`
`U.S. Patent
`
`May 24, 2005
`
`Sheet 2 of3
`
`US 6,897,905 B2
`
`F|G.2
`
`3
`
`

`
`U.S. Patent
`
`May 24, 2005
`
`Sheet 3 of3
`
`US 6,897,905 B2
`
`F|G.4
`
`-—————-----—-.--——_--—-----—
`
`I'D
`
`--..-....‘----- I I I I
` DVD
`
`
`
`REPRODUCING
`DEVICE
`
`
`
`
`
`TELEVISION A
`
`CIRCUIT
`
`
`
`SUBSTRATE
`
`
`POWER SUBSTRATE
`
`42
`
`221
`
`22
`
`4
`
`

`
`US 6,897,905 B2
`
`1
`TELEVISION WITH BUILT-IN DVD DEVICE
`
`BACKGROUND OF THE INVENTION
`
`1. Technical Field
`
`The present invention relates to a television with a built-in
`DVD device in which a cabinet is formed by an insulating
`material, and more particularly to a television with a built-in
`DVD device in which a DVD device and a filter substrate
`
`connecting the DVD device to a television circuit substrate
`are covered with a shielding case.
`2. Related Art
`
`A DVD reproducing device radiates noise with a very
`large level due to an influence of processing of a digital
`image signal acting as animation. Because of this, a level of
`high-frequency noise radiated to the outside of a cabinet has
`been reduced by using a metal in the cabinet (called a first
`conventional art).
`Also, in order to avoid complication of workability, a lead
`wire having a connector connected to a television circuit
`substrate has been used in a path for connecting the televi-
`sion circuit substrate to a filter inserted into a path for
`connecting the DVD reproducing device to the television
`circuit substrate for performing processing of an analog
`image signal (called a second conventional art).
`Also,
`in a television with a built-in CD reproducing
`device, a conventional art for reducing noise occurring from
`the CD reproducing device has been proposed as the Unex-
`amined Japanese Patent Application Publication No. Hei8-
`307783. That is, in this art, an operation of the CD repro-
`ducing device is stopped when a CD has not been inserted
`into the CD reproducing device. Also, when a CD has been
`inserted into the CD reproducing device, only a clock
`generating part of a voice system or a clock generating part
`of a video system is operated according to a kind of the
`inserted CD. Therefore, a level of radiation acting as inter-
`ference is reduced (called a third conventional art)
`[Problems to be Solved]
`However, in the case of attempting to build the DVD
`reproducing device into a television, the following problems
`have been caused when the first conventional art is used.
`
`That is, when the DVD reproducing device and the televi-
`sion are integrated and a cabinet is formed of metal, a shape
`of the cabinet is large, so that a device becomes heavy. Also,
`a price of the cabinet increases.
`And, an effect obtained by forming the cabinet of metal
`results in attenuation of unnecessary radiation to the cabinet
`outside. Because of this, the following problems cannot be
`solved.
`
`That is, a television circuit for processing a signal of
`television becomes a circuit for processing a signal of an
`analog system. On the other hand, the DVD reproducing
`device becomes a device for obtaining an analog image
`signal finally by performing digital signal processing of a
`digital image signal recorded on an optical disk and a D/A
`conversion. And, a clock frequency becomes a very high
`frequency. Because of this, a level of high-frequency noise
`radiated from the DVD reproducing device is very large.
`Therefore, when both of a television circuit substrate and the
`DVD reproducing device are provided inside one cabinet,
`the noise radiated from the DVD reproducing device enters
`the television circuit substrate. As a result of that, a situation
`in which the noise mixes into a screen or a voice of the
`television has been caused.
`Also, the following problems have been caused when the
`second conventional art is used. That is, it is necessary to
`
`2
`have a margin of length in a lead wire for forming a path
`from a filter to the television circuit substrate, so that a bend
`occurs in the lead wire after the connection. Also, a shape of
`this bend varies largely every device. On the other hand, a
`level of high-frequency noise radiated from the lead wire
`becomes large as the lead wire becomes long. Also, the level
`varies largely depending on a bend condition of the lead
`wire. As a result of that, a level of the high-frequency noise
`radiated to the cabinet outside or a level of the high-
`frequency noise entering the television circuit substrate is
`large and the level varies largely every device.
`Also, in the DVD reproducing device, a voice is repro-
`duced simultaneously when an image is reproduced.
`Because of this, as in the third conventional art, a configu-
`ration in which only one generating part of a clock gener-
`ating part of a video system and a clock generating part of
`a voice system is operated cannot be applied. That is, when
`the DVD reproducing device and the television are
`integrated, the third conventional art becomes an art difficult
`to apply.
`
`SUMMARY OF THE INVENTION
`
`10
`
`15
`
`20
`
`The invention is created to solve the problems, and by
`covering a DVD device and a filter substrate for connecting
`the DVD device to a television circuit substrate with a
`
`25
`
`in a configuration in which a cabinet is
`shielding case,
`formed by an insulating material, an object of the invention
`is to provide a television with a built-in DVD device capable
`of reducing an influence of noise generated by the DVD
`device on the television circuit substrate while reducing a
`level of unnecessary radiation to the outside of the cabinet.
`Also, in addition to the object, by arranging the DVD
`device and the filter substrate in the vicinity each other and
`also forming a shielding cover for covering the DVD device
`and the filter substrate in a single case shape, another object
`is to provide a television with a built-in DVD device capable
`of simplifying a processing step of the shielding case while
`preventing upsizing of a shape of the shielding case.
`Also, in addition to the object, by electrically connecting
`the television circuit substrate to the filter substrate through
`metal pins, a further object is to provide a television with a
`built-in DVD device capable of more reducing an influence
`of noise generated by the DVD device on the television
`circuit substrate and eliminating variations in characteristics
`about noise radiation while more reducing a level of unnec-
`essary radiation to the outside of the cabinet without causing
`a deterioration of workability of a manufacturing step.
`Also,
`in addition to the object, by providing the filter
`substrate and the television circuit substrate in the vicinity
`each other sandwiching a wall portion of the shielding case
`and shortening a path length of a signal path for connecting
`the filter substrate to the television circuit substrate, a further
`object is to provide a television with a built-in DVD device
`capable of performing a further reduction in a noise level
`radiated to the outside and further suppression of an influ-
`ence of noise on the television circuit substrate.
`
`Also, in addition to the object, by electrically connecting
`a ground level of a power substrate provided in the vicinity
`of the shielding cover to the shielding case, a further object
`is to provide a television with a built-in DVD device capable
`of improving resistance to fracture characteristics to static
`electricity given from the outside of the cabinet while further
`suppressing a level in which noise occurring in the inside of
`the shielding case leaks to the outside of the shielding case.
`Also, in addition to the object, by directly connecting a
`pattern acting as the ground level of the secondary side of
`
`30
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`5
`
`

`
`US 6,897,905 B2
`
`3
`the power substrate to the shielding case to more reduce a
`connection impedance between the ground level of the
`secondary side and the shielding case, a further object is to
`provide a television with a built-in DVD device capable of
`further improving a shielding effect and the resistance to
`fracture characteristics to static electricity.
`[Means for Solving the Problems]
`In order to solve the problems, in a television with a
`built-in DVD device according to the invention, it is applied
`to the television with a built-in DVD device in which there
`
`are provided a DVD device for sending out an analog image
`signal obtained on the basis of a reproducing signal of a
`DVD and a television circuit substrate for processing the
`analog image signal and a cabinet is formed by an insulating
`material, and there are provided a filter substrate in which a
`filter for forming a path for electrically connecting the DVD
`device to the television circuit substrate and also reducing a
`noise component flowing from the side of the DVD device
`through the path is formed, and a shielding case for covering
`the DVD device and the filter substrate.
`
`That is, the shielding case electromagnetically shields the
`DVD device and the filter substrate in a relation to the
`outside of the shielding case. Also,
`the filter substrate
`reduces high-frequency noise leaking to the outside of the
`shielding case through a path for electrically connecting the
`DVD device to the television circuit substrate.
`
`Also, in addition to the configuration, the shielding case
`comprises a shielding pedestal made of a metal plate with a
`substantially plane shape and a shielding cover mounted in
`the shielding pedestal, and the DVD device and the filter
`substrate are arranged in the vicinity each other on the
`shielding pedestal, and the shielding cover for covering the
`DVD device and the filter substrate is formed in a single case
`shape.
`the DVD device and the filter substrate are
`is,
`That
`arranged in the vicinity, so that the shielding cover for
`covering the DVD device and the filter substrate is minia-
`turized. Also, the shielding cover is in a single case shape,
`so that a complicated processing step is not required.
`Also,
`in addition to the configuration,
`the television
`circuit substrate is electrically connected to the filter sub-
`strate through metal pins whose one ends are fixed in one
`substrate of two kinds of the substrates of the television
`circuit substrate or the filter substrate and the other ends can
`
`be inserted into and extracted from a connector provided in
`the other substrate of two kinds of the substrates.
`
`That is, a path for electrically connecting the filter sub-
`strate to the television circuit substrate constructs the short-
`
`est path with respect to a distance between the filter substrate
`and the television circuit substrate. Therefore, a path length
`exposed to the outside of the shielding case becomes shorter.
`Also,
`the path for connecting the filter substrate to the
`television circuit substrate has a constant position relation
`anytime with respect to the shielding case or the television
`circuit substrate. Also,
`the filter substrate is electrically
`connected to the television circuit substrate by only mount-
`ing the side of the shielding case in the side of the television
`circuit substrate so as to insert the other ends of the metal
`
`pins into the connector.
`Also, in addition to the configuration, the filter substrate
`and the television circuit substrate are provided in the
`vicinity each other sandwiching a wall portion of the shield-
`ing case.
`That is, a distance between the filter substrate and the
`television circuit substrate becomes shortest. Therefore, a
`length of the metal pins exposed to the outside of the
`shielding case becomes shortest, so that a level of high-
`
`4
`frequency noise radiated from the metal pins to the outside
`of the shielding case is suppressed more.
`Also, in addition to the configuration, a power substrate
`for supplying an operating power source is provided in the
`vicinity of the shielding cover and a ground level of the
`secondary side of the power substrate is electrically con-
`nected to the shielding case.
`That is, the shielding case is connected to the ground level
`of the secondary side of the power source through a short
`path. As a result of this, a level in which noise occurring in
`the inside of the shielding case leaks to the outside of the
`shielding case is suppressed further. Also, a larger portion of
`electrostatic noise given from the outside of the cabinet
`flows to the side of the shielding case.
`Also, in addition to the configuration, a pattern acting as
`the ground level of the secondary side of the power substrate
`is directly connected to the shielding case.
`That is, the shielding case is connected to the ground level
`of the secondary side of the power source at very low
`impedance. As a result of this, a level
`in which noise
`occurring in the inside of the shielding case leaks to the
`outside of the shielding case is suppressed further. Also, a
`larger portion of electrostatic noise given from the outside of
`the cabinet flows to the side of the shielding case.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIGS. 1A and 1B are a plan view and a front view
`showing a structure near a shielding case in one embodiment
`of a television with a built-in DVD device according to the
`invention;
`FIG. 2 is an illustration showing a part of a cross section
`taken on line E—E in FIG. 1;
`FIG. 3 is a front view showing an outward appearance of
`the embodiment;
`FIG. 4 is a block diagram showing an electrical connec-
`tion of the embodiment; and
`FIG. 5 is an illustration showing a connection point
`between a pattern for ground level of a power substrate and
`a shielding case.
`DETAILED DESCRIPTION OF THE
`PREFERRED EMBODIMENTS
`
`5
`
`10
`
`15
`
`20
`
`25
`
`30
`
`40
`
`45
`
`[Mode for Carrying out the Invention]
`An embodiment of the invention will be described below
`
`with reference to the drawings.
`FIGS. 1A and 1B are a plan view and a front view
`showing a structure near a shielding case in one embodiment
`of a television with a built-in DVD device according to the
`invention, and FIG. 2 is an illustration showing a part of a
`cross section taken on line E—E in FIG. 1, and FIG. 3 is a
`front view showing an outward appearance of the
`embodiment, and FIG. 4 is a block diagram showing an
`electrical connection of the embodiment.
`
`In the drawings, a CRT 71 or a DVD device 1 is provided
`inside a cabinet 75 formed of an insulating material such as
`plastic. Also, key switches 72 for inputting various direc-
`tions are provided below a front panel. That is, since the
`cabinet 75 is formed by an insulating material, in case that
`high-frequency noise occurs in the inside, the cabinet 75 has
`a structure difficult to shield the noise.
`
`A television circuit substrate 5 mounted in substantially
`parallel with a base plate of the cabinet 75 provides a tuner
`or a processing circuit of a video signal below the cabinet 75.
`As a result of this, when reception of broadcast is directed
`by the key switches 72, the television broadcast is received
`and also the received image is displayed on the CRT 71.
`
`50
`
`55
`
`60
`
`65
`
`6
`
`

`
`US 6,897,905 B2
`
`5
`Also, when reproduction of the DVD device 1 is directed, an
`analog image signal sent from the DVD device 1 is dis-
`played on the CRT 71.
`A shielding case 2 is constructed of a shielding pedestal
`22 with a substantially rectangle and a substantially plane
`shape and a shielding cover 21, and the shielding pedestal 22
`is formed by bending an iron plate. Also, the DVD device 1
`is mounted substantially in the center of the upper portion of
`the shielding pedestal 22. Then, a filter substrate 3 adjacent
`to the DVD device 1 is mounted in the right side of the DVD
`device 1 and a power substrate 4 is mounted in the left side.
`Incidentally, support members for mounting the filter sub-
`strate 3 or the power substrate 4 in the shielding pedestal 22
`are omitted in FIG. 1.
`
`The shielding cover 21 is formed by bending an iron plate,
`and becomes a box with the lower portion opened, namely
`a single case shape, and is mounted to the shielding pedestal
`22 so as to cover the DVD device 1 mounted to the shielding
`pedestal 22 and the filter substrate 3 from the upper side.
`Also, a notch 23 is formed in the range from the center to the
`left portion of a front wall 211 of the shielding cover 21 so
`as not to prevent a tray 13 of the DVD device 1 from moving
`forward. That is, except for the formation range of the notch
`23, the whole circumference of the DVD device 1 and the
`filter substrate 3 is constructed so as to be covered with the
`
`shielding case 2.
`The DVD device 1 includes the tray 13, and provides a
`mechanism part 12 equipped with a mechanism for moving
`the tray 13, a driving mechanism of a DVD or a pickup and
`a substrate 11 installed in the upper portion of the mecha-
`nism part 12. Then, a signal processing circuit for generating
`an analog image signal by processing a digital image signal
`reproduced from the DVD through the pickup is provided in
`this substrate 11.
`The filter substrate 3 becomes a substrate in which a path
`for electrically connecting the DVD device 1 to a television
`circuit substrate 5 is formed, and reduces a high-frequency
`noise component which occurs in the DVD device 1 and
`leaks to the side of the television circuit substrate 5.
`
`is, a path by which an operating power source
`That
`supplied from the power substrate 4 and guided through the
`television circuit substrate 5 is guided to the DVD device 1
`is formed in the filter substrate 3. Also, a low-pass filter
`comprising a coil and a capacitor is provided in this path in
`order to eliminate the high-frequency noise leaking to the
`side of the television circuit substrate 5. Also, a path by
`which an analog image signal generated in the DVD device
`1 is guided to the television circuit substrate 5 is formed.
`Also, a path for transmitting a control signal exchanged
`between the DVD device 1 and the television circuit sub-
`strate 5 is formed.
`
`the substrate 11 of the DVD device 1 is
`Incidentally,
`electrically connected to the filter substrate 3 through an
`FFC (flexible flat cable), but this FFC is omitted in the
`drawing.
`The power substrate 4 becomes a block for generating an
`operating power source of the television circuit substrate 5
`and an operating power source of the DVD device 1 using
`a commercial power source as a primary side input.
`Incidentally, a pattern (showing the rough shape by a slash
`portion 411) acting as a secondary side ground level is
`formed along the vicinity of a side 45 along a longitudinal
`direction of the power substrate 4. Then, this pattern 411 is
`constructed so as to be electrically connected to the shield-
`ing pedestal 22 at three places shown by numeral 41.
`That is, as shown in FIG. 5, in the shielding pedestal 22,
`a support member 221 for fixing the power substrate 4 is
`
`10
`
`15
`
`20
`
`25
`
`30
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`6
`formed integrally with the shielding pedestal 22 in corre-
`spondence with the places shown by numeral 41 of the
`power substrate 4. Also, a pattern exposure part to which a
`resist material is not applied is formed in the places corre-
`sponding to numeral 41 of the pattern 411. As a result of this,
`when the power substrate 4 is mounted in the shielding
`pedestal 22 through the support member 221, a pattern 411
`acting as a ground level in the power substrate 4 is electri-
`cally connected directly to the shielding pedestal 22 at the
`three places shown by numeral 41.
`Incidentally, a mounting position of the power substrate 4
`becomes a position near to a wall portion of the shielding
`cover 21 in a state in which the shielding cover 21 is
`mounted to the shielding pedestal 22 in order to set a
`connection impedance between the ground level and the
`shielding case 2 to a lower value. Also, the power substrate
`4 is constructed so as to be supported by the shielding
`pedestal 22 through a support member (not shown) at three
`places in addition to the three places described above.
`Also,
`the filter substrate 3 is constructed so as to be
`electrically connected to the television circuit substrate 5
`through metal pins with a straight
`line shape. For this
`purpose, connectors 31 are mounted in two places of the
`filter substrate 3. Also, as shown in FIG. 2, a pin part 6
`consisting of plural (for example, eight) metal pins 62 to 62
`supported by a pin support member 61 is mounted in a
`position on the television circuit substrate 5 corresponding
`to the connectors 31. Also, ends 622 of the metal pins 62 are
`electrically connected to the television circuit substrate 5.
`As a result of this, when the shielding pedestal 22 in
`which the filter substrate 3 is mounted is moved toward the
`
`side of the television circuit substrate 5 from the upper
`portion and is mounted to a predetermined position, the ends
`621 of the metal pins 62 are inserted into an opening part 225
`formed in the shielding pedestal 22 and are inserted into the
`connectors 31.
`
`Then, when the shielding pedestal 22 is mounted in the
`predetermined position, the filter substrate 3 and the televi-
`sion circuit substrate 5 are provided in the vicinity position
`in parallel with each other sandwiching the shielding ped-
`estal 22 which is a wall portion of the shielding case 2.
`Therefore, the filter substrate 3 and the television circuit
`substrate 5 are electrically connected each other through the
`metal pins 62 achieving the shortest path.
`A function of the embodiment comprising the above-
`mentioned configuration will be described below.
`The shielding cover 21 becomes a box with the lower
`portion opened, namely a single case shape. Because of this,
`the shielding case 2 formed by the shielding pedestal 22 and
`the shielding cover 21 electromagnetically shields the whole
`surface of the circumference of the DVD device 1 and the
`
`filter substrate 3 to the outside of the shielding case 2 (where
`the formation range of the notch 23 of the front wall 211 is
`excepted)
`Therefore, high-frequency noise radiated from the DVD
`device 1, high-frequency noise radiated from the FFC (not
`shown) for connecting the DVD device 1 to the filter
`substrate 3 and high-frequency noise radiated from the filter
`substrate 3 are shielded by the shielding case 2. As a result
`of this, since the cabinet 75 is formed by an insulating
`material, high-frequency noise radiated to the outside of the
`cabinet 75 is reduced regardless of a structure difficult to
`shield the high-frequency noise by the cabinet 75.
`Also, the DVD device 1 and the filter substrate 3 are
`provided in the vicinity each other, so that a shape of the
`shielding cover 21 is miniaturized. And, the shape of the
`shielding cover 21 is a single case shape, so that processing
`is facilitated.
`
`7
`
`

`
`US 6,897,905 B2
`
`7
`the filter substrate 3 and the television circuit
`Also,
`substrate 5 are electrically connected each other through the
`metal pins 62 with a straight line shape. Therefore, a path for
`electrically connecting the filter substrate 3 to the television
`circuit substrate 5 constructs the shortest path with respect to
`a distance between the filter substrate 3 and the television
`circuit substrate 5.
`
`Incidentally, radiation of high-frequency noise mixed into
`this path is generated from a portion exposed to the outside
`of the shielding case 2 of the path for connecting the filter
`substrate 3 to the television circuit substrate 5. Also, a level
`of the radiation increases as a path length exposed to the
`outside of the shielding case 2 becomes long. However, the
`path described above is formed by the metal pins 62, so that
`the path length exposed to the outside of the shielding case
`2 becomes shortest with respect to the distance between the
`filter substrate 3 and the television circuit substrate 5. As a
`
`result of this, a level of high-frequency noise radiated from
`the path for connecting the filter substrate 3 to the television
`circuit substrate 5 to the outside is suppressed to an infini-
`tesimal value.
`
`Also, since the path for connecting the filter substrate 3 to
`the television circuit substrate 5 is formed by the metal pins
`62 in which flexure or bend does not occur, a mutual position
`relation between this path and the shielding case 2 or the
`television circuit substrate 5 becomes a constant position
`relation anytime. Thus, variations in a level of high-
`frequency noise radiated from the metal pins 62 are elimi-
`nated. Therefore,
`there is no need for a correction of
`variations in a level of unnecessary radiation.
`Also, the filter substrate 3 is electrically connected to the
`television circuit substrate 5 by only mounting the shielding
`case 2 in a predetermined position so as to connect ends 621
`of the metal pins 62 to the connectors 31. Therefore,
`complexity of workability does not occur.
`Also,
`the filter substrate 3 and the television circuit
`substrate 5 become a position relation in the vicinity in
`parallel with each other sandwiching the shielding pedestal
`22 which is a wall portion of the shielding case 2. Because
`of this, a distance between the filter substrate 3 and the
`television circuit substrate 5 becomes shortest. As a result of
`
`that, a length of the metal pins 62 exposed to the outside of
`the shielding case 2 is minimized. As a result of this, a level
`of high-frequency noise radiated from the path for connect-
`ing the filter substrate 3 to the television circuit substrate 5
`to the outside is greatly reduced.
`Also, the power substrate 4 is located in the vicinity of the
`shielding case 2 and also a ground level of the secondary
`side of the power substrate 4 is electrically connected to the
`shielding case 2. As a result of that, the ground level of the
`secondary side is electrically connected to the shielding case
`2 through a short path. Therefore, a level in which noise
`occurring in the inside of the shielding case 2 leaks to the
`outside of the shielding case 2 is suppressed further. Also, a
`larger portion of electrostatic noise given from the outside of
`the cabinet flows to the side of the shielding case 2, so that
`resistance to fracture characteristics to static electricity is
`improved.
`Also, a method for connecting the ground level of the
`secondary side of the power substrate 4 to the shielding case
`2 becomes a method for electrically connecting the pattern
`411 acting as the ground level directly to the shielding case
`2. Therefore, the shielding case 2 is connected to the ground
`level of the secondary side of the power source at very low
`impedance.
`As a result of this, a level in which noise occurring in the
`inside of the shielding case 2 leaks to the outside of the
`
`8
`shielding case 2 is suppressed more. Also, a larger portion of
`electrostatic noise given from the outside of the cabinet
`flows to the side of the shielding case 2, so that resistance to
`fracture characteristics to static electricity can be improved
`further.
`
`[Effect of the Invention]
`As described above, in a television with a built-in DVD
`device according to the invention,
`it
`is applied to the
`television with a built-in DVD device in which there are
`
`provided a DVD device for sending out an analog image
`signal obtained on the basis of a reproducing signal of a
`DVD and a television circuit substrate for processing the
`analog image signal and a cabinet is formed by an insulating
`material, and there are provided a filter substrate in which a
`filter for forming a path for electrically connecting the DVD
`device to the television circuit substrate and also reducing a
`noise component flowing from the side of the DVD device
`through the path is formed, and a shielding case for covering
`the DVD device and the filter substrate. Therefore,
`the
`shielding case electromagnetically shields the DVD device
`and the filter substrate in a relation to the outside of the
`
`the filter substrate reduces high-
`shielding case. Also,
`frequency noise leaking to the outside of the shielding case
`through a path for electrically connecting the DVD device to
`the television circuit substrate. As a result of this, an
`influence of noise generated by the DVD device on the
`television circuit substrate can be reduced while reducing a
`level of unnecessary radiation to the outside of the cabinet.
`Also, the shielding case comprises a shielding pedestal
`made of a metal plate with a substantially plane shape and
`a shielding cover mounted in the shielding pedestal, and the
`DVD device and the filter substrate are arranged in the
`vicinity each other on the shielding pedestal, and the shield-
`ing cover
`for covering the DVD device and the filter
`substrate is formed in a single case shape. That is, the DVD
`device and the filter substrate are arranged in the vicinity, so
`that the shielding cover for covering the DVD device and the
`filter substrate is miniaturized. Also, the shielding cover is in
`a single case shape, so that a complicated processing step is
`not required. As a result of this, a processing step of the
`shielding case can be simplified while preventing upsizing
`of a shape of the shielding case.
`Also, the television circuit substrate is electrically con-
`nected to the filter substrate through metal pins whose one
`ends are fixed in one substrate of two kinds of the substrates
`of the television circuit substrate or the filter substrate and
`the other ends can be inserted into and extracted from a
`
`10
`
`15
`
`20
`
`25
`
`30
`
`40
`
`45
`
`connector provided in the other substrate of two kinds of the
`substrates. Therefore, a path for electrically connecting the
`filter substrate to the television circuit substrate is shortened
`
`50
`
`and a path length exposed to the outside of the shielding case
`becomes short. Also, the path has a constant position relation
`anytime with respect to the shielding case or the television
`circuit substrate. And,
`the filter substrate is electrically
`connected to the television circuit substrate by only mount-
`ing the filter substrate so as to insert the other ends of the
`metal pins into the connector. As a result of this, a level of
`unnecessary radiation to the outside of the cabinet can be
`reduced more without causing a deterioration of workability
`of a manufacturing step. Also, an influence of noise gener-
`ated by the DVD device on the television circuit substrate
`can be reduced more and variations in a level of noise
`radiation can be eliminated.
`Also, the filter substrate and the television circuit sub-
`strate are provided in the vicinity each other sandwiching a
`wall portion of the shielding case. Therefore, a distance
`between the filter substrate and the television circuit sub-
`
`55
`
`60
`
`65
`
`8
`
`

`
`US 6,897,905 B2
`
`9
`strate becomes shortest. As a result of that, since a length of
`the metal pins exposed to the outside of the shielding case
`becomes shortest, a level of high-frequency noise radiated
`from the metal pins to the outside of the shielding case is
`more suppressed, so that a further reduction in a noise level
`radiated to the outside and further suppression of an influ-
`ence of noise on the television circuit substrate can be
`
`performed.
`Also, a power substrate for supplying an operating power
`source is provid