CN2343726Y - Mobile state focusing device - Google Patents
Mobile state focusing device Download PDFInfo
- Publication number
- CN2343726Y CN2343726Y CN 98228234 CN98228234U CN2343726Y CN 2343726 Y CN2343726 Y CN 2343726Y CN 98228234 CN98228234 CN 98228234 CN 98228234 U CN98228234 U CN 98228234U CN 2343726 Y CN2343726 Y CN 2343726Y
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- CN
- China
- Prior art keywords
- focusing
- focus
- action attitude
- transformer
- circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model creates and relates to a mobile state focusing device for a color cathode ray tube with a wide screen. A mobile state focus transformer for the circuit couples sawtooth current in the circuit, and the sawtooth current is changed into parabolic wave through integration circuit which is then modulated and used on focusing voltage. Different focusing voltage can be provided to different parts of a screen. Therefore, the focusing performance of the whole screen is ensured.
Description
The utility model relates to the action attitude focusing arrangement of a kind of colour TV with cathode ray tube (CRT).
At present, the used picture tube of color television set is cathode ray tube (CRT), and its type of focusing is a static focusing, and focus voltage is a constant voltage.Focusing on curved surface is similar to by the sphere that constitutes with the equidistant point of electron gun, the radius of curvature of large-screen color TV is bigger, screen is similar to the plane, the pairing focusing curved surface of screen curved surface and constant focus voltage is obviously inconsistent, the fortune sample, if focus on constant voltage, the focusing of often looking after the image optimum screen edge at center Screen position when debugging then can be poorer, just can not guarantee that all there is the good focusing effect at each position of whole screen.
The action attitude focus circuit of having announced (number of patent application 95109636) has designed a kind of action attitude focusing arrangement that is used to have the CRT device of vertical and horizontal deflection coil.This action attitude focusing arrangement can proofread and correct because the picture degradation that focus difference brought.But fortune kind of circuit must be provided with devices such as the amplifier of vertical direction and horizontal direction and superimposer, and structure is complicated, and reliability is relatively poor, and corresponding cost increases more.
At present, on the market popular widescreen colour TV, screen width high ratio is 16: 9.When using constant voltage to focus on, the not good performance of the bad caused image in the horizontal direction of focusing effect is especially obvious.Picture quality not good and performance in vertical direction be not very outstanding.
The purpose of this utility model provides a kind of action attitude focusing arrangement that is easy to realize simple in structure, can increase under the less situation at cost, realizes the even focusing of widescreen colour TV, obtains television image preferably.
The purpose of this utility model reaches like this.At original constant focus voltage V
FOn superpose the again bucking voltage of an approximate parabolic shape, the electric current synchronised in this bucking voltage and the deflecting coil so that focus voltage is different along with the difference of electron beam deflecting angle, promptly reaches the action attitude compensation of focus voltage.Its circuit is made up of constant focus circuit (former focus circuit) and compensating circuit, and compensating circuit is by action attitude focus transformer T
1, filter capacitor C
1And modulating capacitor C
2Form.Action attitude focus transformer T
11 pin of elementary winding be serially connected with line deflector coil L
1Back and line output triode V
1Connect; Action attitude focus transformer T
13 pin of secondary winding meet filter capacitor C respectively
1An end and ground connection; Action attitude focus transformer T
14 pin series resistor R of secondary winding
1After meet filter capacitor C respectively
1The other end and modulating capacitor C
2An end, modulating capacitor C
2The other end and constant focus circuit link together, and receive on the focusing electrode of CRT.
The utility model forms the focusing performance that action attitude focus voltage guarantees the whole screen of widescreen colour TV by action attitude focus transformer.
The utility model has designed a kind of action attitude focusing arrangement, be added in focus voltage on the CRT focusing electrode by change, changed the focusing curved surface, make it consistent with the curved surface of screen, reach the purpose of the focusing effect that improves horizontal direction, thereby improve the consistency of whole screen focusing performance, so that obtain television image preferably.
Device of the present utility model is achieved like this.
Fig. 1 is the utility model action attitude focusing arrangement circuit diagram
Fig. 2 for colour TV with former constant focus voltage V
FOscillogram
Fig. 3 focuses on required parabolic voltage oscillogram for the utility model action attitude
Fig. 4 focuses on action attitude focus voltage V after the modulation for the utility model action attitude
DFOscillogram
Below in conjunction with accompanying drawing the utility model is described in further detail.
Circuit diagram shown in Figure 1 is made up of following device: line output triode V1, line deflector coil L1, Mobile state focus transformer T1, resistance R1, filter capacitor C1, constant focus voltage VFAnd the equivalent resistance R of constant focusing arrangement2, modulating capacitor C2, Mobile state focus voltage VDF C wherein1Be high-voltage capacitance, withstand voltage more than 1.5KV, the appearance value is between 500PF～1500PF, according to used CRT and T1Adjust, form R1C
1Integrating circuit. C2Be high-voltage capacitance, withstand voltage more than 15KV, the appearance value is between 300PF～3000PF. T1The Mobile state focus transformer, its inductance value: L43〉=1H, turn ratio: n=45～80, internal resistance: R1～2≤0.05Ω,R
34=30～60 Ω, breakdown voltage: 1～2 and 4～6 or magnetic core between be 〉=5000V (dc), 4～6 and magnetic core between be 〉=500V (dc) maximum operating currenbt: I1～2max=3A、
I
3～4 max=0.15A。V
DFDirectly be connected on the focusing electrode of CRT.
This circuit is to realize what Mobile state focused on according to following principle:
After circuit is connected, because of Mobile state focus transformer T1(T
1Have specific internal resistance and turn ratio) armature winding directly and line deflector coil L1So series connection is the line deflector coil L that flows through1Sawtooth current also flow through simultaneously Mobile state focus transformer T1Armature winding, dynamic focus transformer T is expert at1The corresponding load of secondary access just can be coupled to corresponding sawtooth current, through R1C
1The integrating circuit that forms forms parabolic shape behind integration, this parabolic shape is by modulating capacitor C2Just can be modulated to constant voltage VFUpper formation Mobile state focus voltage VDF(be modulating capacitor C2Will be respectively from R2And C1The signal that comes is modulated at and forms together action attitude focus voltage VDF),V
DFIn direct current voltage be exactly original constant focus voltage, VDFIn parabolic voltage be exactly required correction value, VDFDirectly be added on the focusing electrode of CRT, just provide different focus voltages corresponding to the screen diverse location like this, formed focusing curved surface just can be consistent with the screen curved surface, keeps good whole screen focusing effect.
The CRT device of different size, required action attitude focus voltage is not identical yet, can recently change by the number of turn of adjusting action attitude focus transformer action attitude focus voltage, can be by adjusting the time constant R of integrating circuit yet1C
1The amplitude that changes integration gained parabolic shape reaches change action attitude focus voltage.
Can find out that with Fig. 2, Fig. 3, Fig. 4 the utility model has stronger influence to the focusing effect of colour TV.If estimate with the grid signal, for the colour TV that does not add the utility model action attitude focusing arrangement, can see significantly: the focusing of screen center is better, vertical line is thin and true, and the vertical line that is positioned at the screen both sides is thicker, be about 2～3 times of width (and its width is identical in input signal) of central area, and tangible blooming effect is arranged.If do not add any signal, when seeing the noise spot on the screen, also can obviously find out the noise spot that is positioned at the screen both sides noise spot greater than the central area.After adding the utility model action attitude focusing arrangement, the focus variable rheostat that is positioned at horizontal equilibrium flyback transformer (being called for short FBT) is slightly adjusted, for the grid signal, can see, the vertical line that is positioned at screen both sides and center is thin and true, the good focusing effect is all arranged, and the blooming effect on former screen both sides has also been eliminated.If plus signal not, when seeing the noise spot on the screen, the noise spot size of different curtain both sides and central area is basic identical.
To with the ratio of width to height be 16: 9 widescreen colour TV, not obvious because of blooming effect in the vertical direction performance, add the above line dynamic focus device, also just improved the whole screen focusing effect of colour TV greatly.
The utility model action attitude focusing arrangement mainly is to be used to take action the improvement that attitude focuses on, and is suitable for 16: 9 widescreen colour TV, certainly, for 4: 3 colour TV, also can improve its horizontal focusing effect; Regulate easily, only need to change high-voltage capacitance C
1Value, just can change the amplitude of parabolic shape, also just changed the size of action attitude focus voltage, can be adapted to dissimilar CRT; It simple in structure need not be provided with the device that independent parabolic shape amplifies, the focus transformer T that this circuit is provided with
1Turn ratio can determine the amplitude of secondary winding sawtooth waveforms; Because action attitude focus voltage directly is modulated to the constant focus voltage, just can obtain a focus voltage, all can adapt to the CRT of the existing monofocal utmost point.
The action attitude focusing arrangement of the utility model large-screen color TV, be applicable to because fluoroscopic radius of curvature is bigger, and cause the different caused screens of corresponding distance inconsistent phenomenon of focal length centre and corner from electron gun to the screen each point, to obtain preferable television image.
The utility model action attitude focusing arrangement is by the horizontal direction focusing effect of change colour TV screen, thereby the effect that whole screen is focused on is obviously improved.This circuit structure is simple, and is cheap, is a kind of circuit arrangement that is easy to realize.
Embodiment 1
The concrete parameter value of implementing the used components and parts of the utility model action attitude line focusing device with reference to Fig. 1 is: C
1=560PF, C
2=820PF, focus transformer T
1Turn ratio n=50.
Embodiment 2
The concrete parameter value of implementing the used components and parts of the utility model action attitude line focusing device with reference to Fig. 1 is: C
1=1500PF, C
2=2700PF, focus transformer T
1Turn ratio n=75.
Embodiment 3
The concrete parameter value of implementing the used components and parts of the utility model action attitude line focusing device with reference to Fig. 1 is: C
1=1000PF, C
2=1800PF, focus transformer T
1Turn ratio n=62.
Embodiment 4
The concrete parameter value of implementing the used components and parts of the utility model action attitude line focusing device with reference to Fig. 1 is: C
1=1500PF, C
2=910PF, focus transformer T
1Turn ratio n=70.
Embodiment 5
The concrete parameter value of implementing the used components and parts of the utility model action attitude line focusing device with reference to Fig. 1 is: C
1=910PF, C
2=820PF, focus transformer T
1Turn ratio n=60.
C among the above embodiment
1, C
2Be respectively the high-voltage capacitance of the withstand voltage 1.5KV of being higher than, 15KV.
Claims (4)
1. action attitude focusing arrangement that is used for color television cathode ray tube (CRT), it is made up of constant focus circuit and compensating circuit, it is characterized in that: compensating circuit is by dynamic focusing transformer T
1, filter capacitor C
1And modulating capacitor C
2Form; Action attitude focus transformer T
11 pin of elementary winding be serially connected with line deflector coil L
1Back and line output triode V
1Connect; Action attitude focus transformer T
13 pin of secondary winding meet filter capacitor C respectively
1An end and ground connection; Action attitude focus transformer T
14 pin series resistor R of secondary winding
1After meet filter capacitor C respectively
1The other end and modulating capacitor C
2An end, modulating capacitor C
2The other end and constant focus circuit link together, and receive on the focusing electrode of CRT.
2. action attitude focusing arrangement as claimed in claim 1 is characterized in that: action attitude focus transformer T
1Inductance: L
43〉=1H, turn ratio: n=45～80.
3. action attitude focusing arrangement as claimed in claim 1 or 2 is characterized in that filter capacitor C
1Withstand voltage more than 1.5KV, the appearance value is between 500PF～1500PF.
4. action attitude focusing arrangement as claimed in claim 1 is characterized in that modulating capacitor C
2Withstand voltage more than 15KV, the appearance value is between 300PF～3000PF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98228234 CN2343726Y (en) | 1998-01-26 | 1998-01-26 | Mobile state focusing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98228234 CN2343726Y (en) | 1998-01-26 | 1998-01-26 | Mobile state focusing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2343726Y true CN2343726Y (en) | 1999-10-13 |
Family
ID=33978399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98228234 Expired - Fee Related CN2343726Y (en) | 1998-01-26 | 1998-01-26 | Mobile state focusing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2343726Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6923476B2 (en) | 2003-09-12 | 2005-08-02 | National Coupling Company, Inc. | Floating seal for undersea hydraulic coupling |
-
1998
- 1998-01-26 CN CN 98228234 patent/CN2343726Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6923476B2 (en) | 2003-09-12 | 2005-08-02 | National Coupling Company, Inc. | Floating seal for undersea hydraulic coupling |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |