CA1310685C - Color television tube with low power consumption deflector - Google Patents
Color television tube with low power consumption deflectorInfo
- Publication number
- CA1310685C CA1310685C CA000587253A CA587253A CA1310685C CA 1310685 C CA1310685 C CA 1310685C CA 000587253 A CA000587253 A CA 000587253A CA 587253 A CA587253 A CA 587253A CA 1310685 C CA1310685 C CA 1310685C
- Authority
- CA
- Canada
- Prior art keywords
- deflection coil
- deflector
- tube
- horizontal deflection
- color television
- Prior art date
- 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
Links
Abstract
ABSTRACT OF THE DISCLOSURE
To make it possible to reduce the horizontal deflection energy needed by a trichromatic cathode tube deflector, the line coil is made in such a way that its ratio ? is about 670 microseconds. It can then be used with a tube having a 29 mm diameter neck and with a mounting designed for tubes having 22 mm diameter necks.
To make it possible to reduce the horizontal deflection energy needed by a trichromatic cathode tube deflector, the line coil is made in such a way that its ratio ? is about 670 microseconds. It can then be used with a tube having a 29 mm diameter neck and with a mounting designed for tubes having 22 mm diameter necks.
Description
1 3 I û 6 IJ 5 COLOR TELEVISION TUBE WITH LO~
POWER CONSUMPTION DEFLECTOR
BACXGROUND OF THE INVENTION
1. Field of the Invention The invention pertains to a mask-type color television tube.
POWER CONSUMPTION DEFLECTOR
BACXGROUND OF THE INVENTION
1. Field of the Invention The invention pertains to a mask-type color television tube.
2. Descri tion of the Prior Art P
A color television tube is made up of a glass chamber under vacuum comprising a front wall or envelope, on the internal side of which are deposited the luminophors constituting the screen, and a cylindrical, rear part known as the neck containing the electron gun or quns and connected to the envelope by a flared part.
The electron beams are deflected by means of magnetic fields obtained by a vertical deflection coil and a horizontal deflection coil. The horizontal deflection coil or line deflector is used for electron beam scanning along the horizontal lines and the vertical deflection coil or frame deflector is used to pass from one line to another. These two coils are placed around the neck and flared part.
In a tube with three electron guns, to be certain that a gun designed for a determined color will produce a beam that reaches only thP luminophor of ~he corresponding color, a perforated mask is generally placed inside the .~1..~
1 3 1 l~
tube at a short distance from the screen, the guns and the holes of the mask being arranged in such a way that they enable this selection of colors.
At present, there are two types of color television tubes which differ from one another in the diameter of their necks. In the first type, this diameter is about 22 mm. and, in the second type, the diameter is about 29 mm.
These diameters are independent of the size of the screen.
The advantage of the tube with a small-diameter neck is, firstly, its small size and, hence, its low cost in material and, secondly, the fact that the energy supplied to the deflector is relatively low, since this deflector is not far from the electron beams. The disadvantage of this type of tube is that the beams are not always satisfactorily focused and that it is more difficult to create a vacuum in it.
On the contrary, it is easier to create a vacuum in a tube with a larger-diameter neck of about 29 mm., and the performance characteristics of the electron guns in this type of tube are also higher than those of guns with small-diameter tubes. However, the deflector of the tube with a larger-diameter neck consumes more power and is thexefore more expensive.
The various characteristics of the deflectors give rise to differences in the characteristics of the television receiver circuits associated with these tubes.
In other words, for a type of tube, there has to be a specific type of associated circuit. In general, the circuit associated with the small-diameter necked tube is preferred because it consumes less power.
The present invention combines the advantages of both types of tubes mentioned above.
SUMMARY OF THE INVENTION
In this invention, the color television tube is formed by the combination firstly of a glass chamber with a neck diameter of about 29 mm. with the corresponding electron guns inside and secondly, a deflector, the line coil of which has a ratio L ~L being the inductance and R
being the resistance) ranging between about 630 and 730 micxoseconds, preferably about 670 microseconds.
A color television tube of this type has the advantage of large-diameter necked tubes, namely high quality images.
Furthermore, surprisingly, despite the greater distances between the deflector and the electron beams, the électrical power consumption of this deflector is of the same magnitude as with a tube having a neck diameter of 22 mm.
The conical part or funnel of the glass chamber, corresponding to the deflection zone, is, for example, of the "Coty-29" 90 type tube marketed by RCA.
I J ~ f~ J J J~
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the invention will emerge from the following description of one of its embodiments, made with reference to the appended drawings, of which:
- Figure 1 is a partial axial section alonq a plane that passes through the horizontal axis (parallel to the big sides of the screen) of a tube according to the invention;
- Figure 2 is a view similar to the one shown in figure 1, but is a section along the plane that passes through the vertical axis (parallel to the small sides of the screen) of the tube;
- ~igure 3 is a side view of a tube deflector according to the invention, and;
- Figure 4 is a rear view of the deflector of figure 3.
DESCRIPTION OF A PREFERRED EMBODIMENT
The tube according to the invention has a glass chamber 10 with associated guns, with a funnel of the 20 "Coty-29" type by RCA, with a neck 11 having an external di~meter of about 29 mm.
By contrast, the deflector 12 differs fro~ the deflector of the "Coty-29" tube in that the ratio L
of the line deflector ranges between 630 and 730 ~ ,~
~ 3 ~ ~6.,5 microseconds, preferably about 670 microseconds. The dimensions, space factor and consumption of the deflector of the tube according to the invention are smaller than the corresponding values for the "Coty-29" tube.
S This deflector 12 extends partly around the neck 11 and partly around the flared part 13.
The said deflector 12 comprises a support 14 made of a non-magnetic material, for example a plastic material, enclosing the saddle-shaped horizontal deflection coil 15 (line deflector). The vertical deflection coil 16 (the frame coil) is toroidal and i5 wound around a ferrite magnetic core 17. This frame deflector is borne by the support 14.
According to an important arrangement of the lS invention, the shapes and dimensions of the support 14, the core 17 and the coil 16 are such that, even before assembly, namely before the fixing of the frame deflector 1~, 17 to the support 14, there is practically no clearance left by the vertical deflector in the direction perpendicular to the axis lla of the tube. It is true that this characteristic constitutes a disadvantage since it prevents a convergence setting while the deflector is being assembled. However, it makes it possible, by bringing the frame deflector closer to the axis lla, to reduce the current consumption of this frame deflector to t~e minimum.
., ,. , . , . ., ,.. ~,.. ... . .
1 3 1 0 6 .j ~
The loss of the possibilit~ of setting the convergence by shifting the vertical deflector in a direction perpendicular to the axis lla is compensated for by an increase in the manufacturing precision of the various elements.
The support 14 has a rear ring 18 enclosing the rear leading-out wires 19 of the horizontal deflection coil 15. This support 14 also has a front ring that houses the front leading-out wires of the horizontal coil 15.
The vertical deflection coil 16 comprises two parts, 161 and 162, that leave between them two wide intervals 171 and 172 of the core 17, which are not surrounded by a coil. Each uncovered part 171 or 172 of the core 17 has approximately the same dimensions as each part covered by a coil 161 or 162.
The rear part 22 of the support 14 is cylindrical, with an inner diameter of about 30 mm.
In one embodiment, the smallest diameter of the inner surface of the core 17 is about 40mm. while the biggest diameter of the internal surface of this core 17 is about 70 mm. The length Ll (Figure 1) of the core 17 along the axis lla is 37 mm. The length L2 between the closest edges of the housings 18 and 20 is 45 mm. The total length of the support 14, again along the axis lla, is 66.5 mm. The biggest diameter 1 3 1 0 j (J ') of the deflector, namely that of the housing 20, is 96 mm.
Conventionally, the part 22, which is notched so that it is flexible and can be applied to the neck, is surrounded by a clamping collar 23 (Figure 4) and the ring 18 of the support 14 has the connections 24 to the power circuit as well as projections 25 so that it can be clipped into the box of a television receiver.
In the embodiment mentioned above for a 90 tube, the power consumption of the line coil is smaller than about 1.6 millijoules and the power of the frame coil is 2.5 Watts, for high voltage of 25 kV. This is the same power level as the one given by the electronic circuits of the mountings associated with tubes having necks of a diameter of 22 mm.
A color television tube is made up of a glass chamber under vacuum comprising a front wall or envelope, on the internal side of which are deposited the luminophors constituting the screen, and a cylindrical, rear part known as the neck containing the electron gun or quns and connected to the envelope by a flared part.
The electron beams are deflected by means of magnetic fields obtained by a vertical deflection coil and a horizontal deflection coil. The horizontal deflection coil or line deflector is used for electron beam scanning along the horizontal lines and the vertical deflection coil or frame deflector is used to pass from one line to another. These two coils are placed around the neck and flared part.
In a tube with three electron guns, to be certain that a gun designed for a determined color will produce a beam that reaches only thP luminophor of ~he corresponding color, a perforated mask is generally placed inside the .~1..~
1 3 1 l~
tube at a short distance from the screen, the guns and the holes of the mask being arranged in such a way that they enable this selection of colors.
At present, there are two types of color television tubes which differ from one another in the diameter of their necks. In the first type, this diameter is about 22 mm. and, in the second type, the diameter is about 29 mm.
These diameters are independent of the size of the screen.
The advantage of the tube with a small-diameter neck is, firstly, its small size and, hence, its low cost in material and, secondly, the fact that the energy supplied to the deflector is relatively low, since this deflector is not far from the electron beams. The disadvantage of this type of tube is that the beams are not always satisfactorily focused and that it is more difficult to create a vacuum in it.
On the contrary, it is easier to create a vacuum in a tube with a larger-diameter neck of about 29 mm., and the performance characteristics of the electron guns in this type of tube are also higher than those of guns with small-diameter tubes. However, the deflector of the tube with a larger-diameter neck consumes more power and is thexefore more expensive.
The various characteristics of the deflectors give rise to differences in the characteristics of the television receiver circuits associated with these tubes.
In other words, for a type of tube, there has to be a specific type of associated circuit. In general, the circuit associated with the small-diameter necked tube is preferred because it consumes less power.
The present invention combines the advantages of both types of tubes mentioned above.
SUMMARY OF THE INVENTION
In this invention, the color television tube is formed by the combination firstly of a glass chamber with a neck diameter of about 29 mm. with the corresponding electron guns inside and secondly, a deflector, the line coil of which has a ratio L ~L being the inductance and R
being the resistance) ranging between about 630 and 730 micxoseconds, preferably about 670 microseconds.
A color television tube of this type has the advantage of large-diameter necked tubes, namely high quality images.
Furthermore, surprisingly, despite the greater distances between the deflector and the electron beams, the électrical power consumption of this deflector is of the same magnitude as with a tube having a neck diameter of 22 mm.
The conical part or funnel of the glass chamber, corresponding to the deflection zone, is, for example, of the "Coty-29" 90 type tube marketed by RCA.
I J ~ f~ J J J~
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the invention will emerge from the following description of one of its embodiments, made with reference to the appended drawings, of which:
- Figure 1 is a partial axial section alonq a plane that passes through the horizontal axis (parallel to the big sides of the screen) of a tube according to the invention;
- Figure 2 is a view similar to the one shown in figure 1, but is a section along the plane that passes through the vertical axis (parallel to the small sides of the screen) of the tube;
- ~igure 3 is a side view of a tube deflector according to the invention, and;
- Figure 4 is a rear view of the deflector of figure 3.
DESCRIPTION OF A PREFERRED EMBODIMENT
The tube according to the invention has a glass chamber 10 with associated guns, with a funnel of the 20 "Coty-29" type by RCA, with a neck 11 having an external di~meter of about 29 mm.
By contrast, the deflector 12 differs fro~ the deflector of the "Coty-29" tube in that the ratio L
of the line deflector ranges between 630 and 730 ~ ,~
~ 3 ~ ~6.,5 microseconds, preferably about 670 microseconds. The dimensions, space factor and consumption of the deflector of the tube according to the invention are smaller than the corresponding values for the "Coty-29" tube.
S This deflector 12 extends partly around the neck 11 and partly around the flared part 13.
The said deflector 12 comprises a support 14 made of a non-magnetic material, for example a plastic material, enclosing the saddle-shaped horizontal deflection coil 15 (line deflector). The vertical deflection coil 16 (the frame coil) is toroidal and i5 wound around a ferrite magnetic core 17. This frame deflector is borne by the support 14.
According to an important arrangement of the lS invention, the shapes and dimensions of the support 14, the core 17 and the coil 16 are such that, even before assembly, namely before the fixing of the frame deflector 1~, 17 to the support 14, there is practically no clearance left by the vertical deflector in the direction perpendicular to the axis lla of the tube. It is true that this characteristic constitutes a disadvantage since it prevents a convergence setting while the deflector is being assembled. However, it makes it possible, by bringing the frame deflector closer to the axis lla, to reduce the current consumption of this frame deflector to t~e minimum.
., ,. , . , . ., ,.. ~,.. ... . .
1 3 1 0 6 .j ~
The loss of the possibilit~ of setting the convergence by shifting the vertical deflector in a direction perpendicular to the axis lla is compensated for by an increase in the manufacturing precision of the various elements.
The support 14 has a rear ring 18 enclosing the rear leading-out wires 19 of the horizontal deflection coil 15. This support 14 also has a front ring that houses the front leading-out wires of the horizontal coil 15.
The vertical deflection coil 16 comprises two parts, 161 and 162, that leave between them two wide intervals 171 and 172 of the core 17, which are not surrounded by a coil. Each uncovered part 171 or 172 of the core 17 has approximately the same dimensions as each part covered by a coil 161 or 162.
The rear part 22 of the support 14 is cylindrical, with an inner diameter of about 30 mm.
In one embodiment, the smallest diameter of the inner surface of the core 17 is about 40mm. while the biggest diameter of the internal surface of this core 17 is about 70 mm. The length Ll (Figure 1) of the core 17 along the axis lla is 37 mm. The length L2 between the closest edges of the housings 18 and 20 is 45 mm. The total length of the support 14, again along the axis lla, is 66.5 mm. The biggest diameter 1 3 1 0 j (J ') of the deflector, namely that of the housing 20, is 96 mm.
Conventionally, the part 22, which is notched so that it is flexible and can be applied to the neck, is surrounded by a clamping collar 23 (Figure 4) and the ring 18 of the support 14 has the connections 24 to the power circuit as well as projections 25 so that it can be clipped into the box of a television receiver.
In the embodiment mentioned above for a 90 tube, the power consumption of the line coil is smaller than about 1.6 millijoules and the power of the frame coil is 2.5 Watts, for high voltage of 25 kV. This is the same power level as the one given by the electronic circuits of the mountings associated with tubes having necks of a diameter of 22 mm.
Claims (5)
1. A 90° color television tube comprising:
a glass chamber having, at a rear part thereof, a neck with an external diameter of about 29 millimetres; and a deflector including an horizontal deflection coil having an inductance L and a resistance R;
characterized in that the ratio ? between the inductance and the resistance of the horizontal deflection coil of the deflector ranges between 630 and 730 microseconds.
a glass chamber having, at a rear part thereof, a neck with an external diameter of about 29 millimetres; and a deflector including an horizontal deflection coil having an inductance L and a resistance R;
characterized in that the ratio ? between the inductance and the resistance of the horizontal deflection coil of the deflector ranges between 630 and 730 microseconds.
2. A tube according to claim 1, characterized in that the ratio ? of the horizontal deflection coil of the deflector is about 670 microseconds.
3. Tube according to claim 1 or 2, wherein the deflector comprises a vertical deflection coil, characterized in that the horizontal deflection coil having a saddle shape with rear and front leading-out wires set in housings forming part of a support that separates the vertical deflection coil from the horizontal deflection coil, and the vertical deflection coil having the shape of a torus wound on a magnetic core between the housings of the leading-out wires of the horizontal deflection coil, the vertical deflection coil is in direct contact with the external surface of the support between the housings for the leading-out wires of the horizontal deflection coil.
4. Tube according to claim 1 or 2, characterized in that the energy consumption of the horizontal deflection coil is smaller than 1.6 millijoule.
5. Tube according to claim 3, characterized in that the power of the vertical deflection coil is 2.5 watts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000587253A CA1310685C (en) | 1988-12-29 | 1988-12-29 | Color television tube with low power consumption deflector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000587253A CA1310685C (en) | 1988-12-29 | 1988-12-29 | Color television tube with low power consumption deflector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1310685C true CA1310685C (en) | 1992-11-24 |
Family
ID=4139386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000587253A Expired - Fee Related CA1310685C (en) | 1988-12-29 | 1988-12-29 | Color television tube with low power consumption deflector |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1310685C (en) |
-
1988
- 1988-12-29 CA CA000587253A patent/CA1310685C/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |