GB2179794A - Rotary variable capacitors - Google Patents
Rotary variable capacitors Download PDFInfo
- Publication number
- GB2179794A GB2179794A GB08620270A GB8620270A GB2179794A GB 2179794 A GB2179794 A GB 2179794A GB 08620270 A GB08620270 A GB 08620270A GB 8620270 A GB8620270 A GB 8620270A GB 2179794 A GB2179794 A GB 2179794A
- Authority
- GB
- United Kingdom
- Prior art keywords
- side plates
- plates
- rear side
- supporting
- variable capacitor
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
- H01G5/38—Multiple capacitors, e.g. ganged
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
- H01G5/04—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of effective area of electrode
- H01G5/06—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of effective area of electrode due to rotation of flat or substantially flat electrodes
Abstract
A variable capacitor has a pair of front and rear side plates (2,3) and supporting bar members (8) for supporting the front and rear side plates in predetermined spaced 2 relationship. The supporting bar members (8) engage support bar supporting portions (2a and 3a) formed on the front and rear side plates (2,3). Earthing bar members (11) are inserted through earthing bar support portions (2b and 3b) formed on the front and rear side plates (2,3). Two variable capacitor sections are formed between the front and rear side plates (2,3), each of the sections including a plurality of rotor plates (4) and a plurality of stator plates (6) corresponding to the rotor plates (4). A rotor shaft (1) rotably supported by the front and rear side plates carries the rotor plates (4) mounted on the rotor shafts. The stator plates (6) are mounted on the supporting bar members (8) and a shielding plate (12) is disposed between the capacitor sections for shielding the sections from each other. The shielding plate is secured to the earthing bar members at one end and to groove means (14) formed in the support bar supporting portions at the other end. <IMAGE>
Description
SPECIFICATION
Variable capacitors
The present invention generally relates to variable capacitors and particularly to small sized variable capacitors having a plurality of variable capacitor sections.
Generally, a variable capacitor is constituted by a plurality of stator plates fixedly provided between a pair of front and rear side plates and a plurality of fan-like shaped rotor plates mounted on a rotor shaft so as to be rotatable together with the rotor shaft, so that any variation in the areas of the facing portions of the respective rotor and stator plates produces a change in the value of the capacitor.
Circuit elements used in electronic circuits for constituting electronic apparatuses are reducing in size more and more as the electronic circuits reduce in size and variable capacitors are no exception. While making a variable capacitor small-sized, it is still required to have a large variable capacitance value.
When miniaturising such a small-sized variable capacitors as described above, they are difficult to assemble and so produce low productivity. Further, the gap between adjacent variable capacitor sections each constituted by a pair of stator and rotor plates is decreased so that the coupling capacitance between the adjacent variable capacitor sections increases to thereby reduce the performance of the electronic apparatuses. Therefore, there has been a serious problem how to reduce the coupling capacitance.
It is an object of the invention to provide an improved small-sized variable capacitor in which coupling capacitance between adjacent variable capacitor sections is reduced.
According to one aspect of the present invention, there is provided a variable capacitor comprising a pair of front and rear side plates; supporting bar means for fixedly connecting the front and rear side plates with each other with a predetermined distance therebetween, the supporting bar means being inserted through support bar supporting portions formed on at least one of the front and rear side plates; earthing bar means inserted through earthing bar supporting portions formed on at least one of the front and rear side plates at one end portion thereof; at least two variable capacitor sections formed between the front and rear side plates, each of the sections including a plurality of rotor plates and a plurality of stator plates corresponding to the rotor plates; a rotor shaft rotably supported by the front and rear side plates, the rotor plates being mounted on the rotor shaft; the stator plates being mounted on the supporting bar means; and a sheilding plate disposed between the at least two variable capacitor sections for shielding the sections from each other, the shielding plate being fixedly mounted on the earthing bar means at its one end and fixedly engaged at its other end by groove means formed in the support bar supporting portions.
Preferably the shielding plate is fixed at its other end within the groove means by caulking of fusing deformable means disposed near the groove means.
Preferably the earthing bar supporting portions are formed on each of the front and rear side plates, the shielding plate being provided with insulating portions through which the earthing bar means are inserted, the insulating portions being disposed between the respective supporting portions of the front and rear side plates to thereby be fixed thereat.
Preferably, the support bar supporting portions includes first support bar supporting portions formed on each of the front and rear side plates at their one end portions and second support bar supporting portions formed on each of the front and rear side plates at their other end portions, and the supporting bar means includes first supporting bars inserted through the respective first support bar supporting portions and second supporting bars inserted through the respective first support bar supporting portions of the front and rear side plates, the stator plates constituting one of the variable capacitor sections being supported between the respective first support bar supporting portions of the front and rear side plates, and the stator plates constituting the other variable capacitor section being supported between the respective second support bar supporting bar supporting portions of the front and rear side plates.
A variable capacitor embodying the invention will now be described, by way of example, with reference to the accompanying diagramatic drawings in which:
Fig. 1 is a front view partly in crosssection on an embodiment of the small-sized variable capacitor according to the present invention;
Fig.2 is a top view showing an embodiment of the shielding plate according to the invention; and
Fig.3 is a top view showing another embodiment of the shielding plate according to the invention.
The small-sized variable capacitor shown in
Fig. 1 has two variable capacitor sections each constituted by three substantially fan-shaped rotor plates 4 and two stator plates 6. The rotor plates 4 and washers 5, each disposed adjacent ones of the rotor plates 4, are mounted on a rotor shaft 1 and fixed thereto by means of a locking member 10. In order to form the two variable capacitor sections together with the four stator plates 6, as shown in Fig. 1, the six rotor plates 4 are grouped into two sets which are mounted on the rotor shaft 1 in staggered vertical relationship to project from the rotor shaft 1 in opposite directions. The rotor shaft 1 is disposed and rotably supported between a front and a rear side plate 2 and 3 each made of a synthetic resin.An earthing conductor 9 is disposed on the inner surface of the rear side plate 3. - The front and rear side plates 2 and 3 are connected by supporting bar members 8 at the left and right end portions. The front and rear side plates 2 and 3 are integrally formed with supporting portions 2a and 3a respectively and the supporting bar members 8 are passed through the supporting portions 2a and 3a and secured thereto as shown in Fig. 1.
The stator plates 6 are also grouped into two sets. One set of two stator plates 6 are provided with a metallic washer 7 therebetween on the two supporting members 8 disposed at the left hand side in the drawing, so that they are inwardly directed from the supporting bar members 8 into two respective gaps formed among the lower sets of three rotor plates 4 with a predetermined spacing between adjacent rotor and stator plates, thereby constituting the lower variable capacitor section, as seen in Fig. 1. The one set of stator plates 4 engaged by the supporting bar members 8 with the washer 7 disposed therebetween are arranged between the supporting portions 2a and 3a of the front and rear side plates 2 and 3 respectively at the left hand side of the drawing so that they are held in a predetermined position.The other set of two stator plates 6 are mounted with another metallic washer 7 therebetween on the two supporting members 8 disposed at the right hand side of the drawing so as to form the upper variable capacitor section together with the upper set of three rotor plates 4 as seen in Fig.1, similarly to the case of the lower variable capacitor section. The other set of stator plates 4 engaged by the supporting bar members 8 together with the washer 7 are arranged between the supporting portions 2a and 3a of the front and rear side plates 2 and 3 respectively at the right hand side of the drawing so that they are held in a predetermined position.Thus, the front and rear side plates 2 and 3 are secured together with the stator plates 6 and the washers 7, by means of the supporting bar members 8 which pass through the respective supporting portions 2a and 3a of the front and rear side plates 2 and 3 as well as the stator plates 6 and the washers 7.
A shielding plate 13 is disposed between the two variable capacitor sections. In particular, the front and rear side plates 2 and 3 are formed with other supporting portions 2b and 3b respectively at the left hand side of the drawing, and the shielding plate 13 is provided at its left hand end with resin portions 13. The shielding plate 12 is formed with through holes 1 2a bored through the resin portions 13 as well as the shielding plate 12, and formed with a notched portion 1 2b to form two leg portions at its left end, as seen in Fig.2 or 3. The resin portions 13 of the shielding plate 12 are respectively sandwiched between the supporting portions 2b and 3b of the front and rear side plates 2 and 3.Earthing bar members 11 are passed through the through holes 1 2a and the respective supporting portions 2b and 3b of the front and rear side plates 2 and 3 so that the shielding plate 12 is fixed at its left hand end in the drawing and electrically connected to the shielding plate 12. The respective ends of the two leg portions of the shielding plate 12 engage grooves 14 formed in the supporting portions 3a of the front side plate 2 (or the supporting post portions 3a of the rear side plate 3) in the right hand side of the drawing, and crushing portions 15 formed on the supporting post portions 3a (or 2a) are caulked by a punch (not shown) or fused by a heater (not shown) so that the shielding plate 12 is secured to tithe holding grooves 14.Thus, the shielding plate 12 is held rigid in a predetermined position between the two, upper and lower, variable capacitor sections each constituted by the rotor plates 4 and the stator plates 6. Because it is secured to the holding grooves 14 by caulking or fusing, the shielding plate 12 has improved vibration proof properties.
The reference numeral 8a designates a terminal formed integrally with each supporting bar member 8. Each of the terminals 8a is electrically connected to the stator plates 6 through the supporting bar members 8 and the washers 7, while being insulated from the earthing conductor 9, so that a predetermined variable capacitance can be obtained between the earthing conductor 9 and each of the terminals 8a. Further, earthing terminals 1 lea formed integrally with the earthing bar members 8a respectively are to be connected to an earthing circuit on a printed circuit substrate (not shown) to thereby obtain a predetermined shielding effect.
Fig.2 shows a shielding plate 12, having resin portions 13 formed at opposite corners of one side of the shielding plate 12 and having a notched portion 1 2b providing as an escape opening for the rotor shaft 1. The resin portions 13 are formed with holes 12a through which the earthing bars 11 can pass.
Fig.3 shows a second embodiment of the shielding plate 12 which is additionally formed with an extended portion 1 2c serving as another terminal.
Thus, the shielding plate 12 is disposed between the two variable capacitor sections in such a manner that the shielding plate 12 is supported at its one end portion by the supporting portions 2b and 3b respectively formed in the front and rear side plates 2 and 3 and at its other end within the grooves 14 of the supporting portions 3b in which the shielding plate end portions are fixed by caulking or fusing crushing members disposed near the grooves 14, so that the coupling capacitance between the variable capacitor sections can be reduced and vibration of the shielding plate 12 can be inhibited to thereby improve the performance of the small-sized variable capacitor.In the thus arranged small-sized variable capacitor there is provided a further advantage that it is possible to provide a practical small-sized variable capacitor in which the shielding plate can be incorporated after the variable capacitor sections have been assembled. That is, a shielding plate can be freely mounted to thereby make it possible to dispose a shielding plate between a desired pair of adjacent variable capacitor sections according to demand.
Although the small-sized variable capacitor illustrated in the embodiment is constituted by two variable sections each including three rotor plates and two stator, the respective numbers of the variable capacitor sections, the rotor plates, and the stator plates are not limited to this, but can be selected as desired. If the number n of the variable capacitor sections is selected to be three or more, the number of the shielding plates is of course selected to be n- 1, that is two or more.
Further, although the supporting portions through which the supporting bar members pass and the supporting portions through which the earthing bar members pass, are formed on both the front and rear side plates in the above embodiment, such supporting portions need be formed on only one of the front and rear side plates.
Claims (1)
1. A variable capacitor comprising: a pair of front and rear side plates, supporting bar means for supporting said front and rear side plates in predetermined spaced relationship, said supporting bar means being inserted through suport bar supporting portions formed in at least one of said side plates; earthing bar means inserted through bar supporting portions formed on at least one of said side plates at one end portion thereof; at least two variable capacitor sections formed between said front and rear side plates, each of said sections including a plurality of rotor plates and a plurality of stator plates corresponding to said rotor plates; a rotor shaft rotatably supported by said side plates, said rotor plates being mounted on said rotor shaft; said stator plates being mounted on said supporting bar means; and a shielding plate disposed between said at least two variable capacitor sections for shielding said sections from each other, said shielding plate being rigid with said earthing bar means at one end and secured at its other end by groove means formed in said support bar supporting portions.
2. A variable capacitor according to Claim 1, wherein said shielding plate is secured ta said groove means by caulking deformable means disposed near said groove means.
3. A variable capacitor according to Claim 1, wherein said shielding plate is secured to said groove means by fusing deformable means disposed near said groove means.
4. A variable capacitor according to any one of claims 1 to 3, wherein said earthing bar supporting portions are formed on each of said front and rear side plates and wherein, said shielding plate are provided with insulating portions through which said earthing bar means are inserted, said insulating portions being disposed between said respective supporting portions of said front and rear side plates.
5. A variable capacitor according to any preceeding claim wherein said support bar supporting portions includes a first support bar supporting portion formed on each of said front and rear side plates at one end portion and a second support bar supporting portion formed on each of said front and rear side plates at the other end portion, and wherein said supporting bar means includes a first supporting bar inserted through said respective first support bar supporting portions, and, a second supporting bar inserted through said respective first support bar supporting portions of said front and rear side plates, said stator plates constituting one of said variable capacitor sections being supported between said respective first support bar supporting portions of said front and rear side plates, and said stator plates constituting the other variable capacitor section being supported between said respective second support bar supporting portions of said front and rear side plates.
6. A variable capacitor substantially as hereinbefore described with reference to the accompanying drawings.
CLAIMS
Amendments to the claims have been filed, and have the following effect:
Claim 1 above has been deleted or textually amended.
New or textually amended claims have been filed as follows:
1. A variable capacitor comprising: a pair of front and rear side plates each made of synthetic resin, supporting bar means for supporting said front and rear side plates in predetermined spaced relationship, said supporting bar means being inserted through suport bar supporting portions formed in at least one of said side plates; earthing bar means inserted through bar supporting portions formed on at least one of said side plates at one end portion thereof; at least two variable capacitor sections formed between said front and rear side plates, each of said sections including a plurality of rotor plates and a plurality of stator plates corresponding to said rotor plates; a rotor shaft rotatably supported by said side plates, said rotor plates being mounted on said rotor shaft; said stator plates being mounted on said supporting bar means: and a shielding plate disposed between said at least two variable capacitor sections for shielding said sections from each other, said shielding plate being rigid with said earthing bar means at one end and secured at its other end by groove means formed in said support bar supporting portions.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985131727U JPS6240821U (en) | 1985-08-30 | 1985-08-30 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8620270D0 GB8620270D0 (en) | 1986-10-01 |
| GB2179794A true GB2179794A (en) | 1987-03-11 |
| GB2179794B GB2179794B (en) | 1989-09-27 |
Family
ID=15064785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8620270A Expired GB2179794B (en) | 1985-08-30 | 1986-08-20 | Variable capacitors |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS6240821U (en) |
| KR (1) | KR900002522Y1 (en) |
| GB (1) | GB2179794B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB256324A (en) * | 1925-05-07 | 1926-08-09 | Ralph Leonard Aspden | Improvements in variable condensers |
| GB357096A (en) * | 1930-06-12 | 1931-09-14 | Gen Electric Co Ltd | Improvements in or relating to electrostatic condensers for wireless apparatus |
| GB456146A (en) * | 1934-05-09 | 1936-11-03 | Radio Condenser Co | Improvements in or relating to electrical condensers |
| GB469915A (en) * | 1936-02-24 | 1937-08-05 | William Oscar Heyne | Improvements in variable electric condensers |
| GB480200A (en) * | 1936-11-13 | 1938-02-18 | William Rogers | Improvements in or relating to variable electric condensers |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61195035U (en) * | 1985-05-27 | 1986-12-04 |
-
1985
- 1985-08-30 JP JP1985131727U patent/JPS6240821U/ja active Pending
-
1986
- 1986-01-31 KR KR2019860001050U patent/KR900002522Y1/en not_active IP Right Cessation
- 1986-08-20 GB GB8620270A patent/GB2179794B/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB256324A (en) * | 1925-05-07 | 1926-08-09 | Ralph Leonard Aspden | Improvements in variable condensers |
| GB357096A (en) * | 1930-06-12 | 1931-09-14 | Gen Electric Co Ltd | Improvements in or relating to electrostatic condensers for wireless apparatus |
| GB456146A (en) * | 1934-05-09 | 1936-11-03 | Radio Condenser Co | Improvements in or relating to electrical condensers |
| GB469915A (en) * | 1936-02-24 | 1937-08-05 | William Oscar Heyne | Improvements in variable electric condensers |
| GB480200A (en) * | 1936-11-13 | 1938-02-18 | William Rogers | Improvements in or relating to variable electric condensers |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2179794B (en) | 1989-09-27 |
| KR870004365U (en) | 1987-07-31 |
| KR900002522Y1 (en) | 1990-03-30 |
| GB8620270D0 (en) | 1986-10-01 |
| JPS6240821U (en) | 1987-03-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |