CN1201646C - Protective hood for circuit board and circuit with protective hood - Google Patents
Protective hood for circuit board and circuit with protective hood Download PDFInfo
- Publication number
- CN1201646C CN1201646C CN 02141281 CN02141281A CN1201646C CN 1201646 C CN1201646 C CN 1201646C CN 02141281 CN02141281 CN 02141281 CN 02141281 A CN02141281 A CN 02141281A CN 1201646 C CN1201646 C CN 1201646C
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- China
- Prior art keywords
- protective cover
- mentioned
- circuit board
- circuit
- otch
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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 - Lifetime
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Casings For Electric Apparatus (AREA)
Abstract
The present invention relates to a circuit board protection cover composed of a protection cover and notches, wherein the protection cover is made of insulation materials and completely covers a circuit mounting surface of a circuit board, and the upper surface of the protection cover is provided with the notches selectively.
Description
Technical field
What the present invention relates to is a kind of circuit board protective cover and the circuit board that has this kind protective cover, specially refers to be formed on a kind of on the circuit board protective cover and to be used to measure/hatch frame of circuit adjustment.
Background technology
The difference that depends on the product type of mounting circuit boards need be covered a protective cover to stop extraneous dust or to prevent short circuit in circuit board top sometimes, perhaps is used for magnetic screen.Only after the assembling of each parts that will comprise circuit board is finished, could correctly check the product running whether normally or to circuit to regulate.Install on the measuring circuit plate and the voltage waveform of circuit or magnitude of voltage before must pull down protective cover on the circuit board.This can make operating process become loaded down with trivial details and time-consuming.
In order to address this problem, to be shown on the protective cover as Fig. 4 A usually and to offer a rectangular slits 221 corresponding to the measurement pad 211 on the circuit board 210 of to be measured/adjusting or the position of circuit adjustment element 212.Shown in Fig. 4 B, measuring probe 231 inwardly inserts by the otch on the protective cover 220 221 and contacts with measuring pad 211 or circuit adjustment element 212, thereby realizes required measurement or circuit adjustment operation.
The protective cover that has this routine is even circuit board 210 also can be in communication with the outside by otch 221 between non-measurement operational period.Like this, Wai Jie dust or foreign matter might enter the inside of protective cover by otch 221.Be short-circuited thereby may cause between the circuit on the circuit board 210, cause circuit to break down.
In addition, electric field or magnetic field might be revealed from circuit board 210 by otch 221, thereby the equipment around the circuit board 210 is produced bad electric influence.
Summary of the invention
The purpose of this invention is to provide a kind of extraneous dust or foreign matter of preventing and enter and prevent circuit board protective cover that electromagnetic wave outside is revealed and the circuit board that has sort circuit plate protective cover.
In order to realize above-mentioned target, the circuit board protective cover that the present invention relates to is made of a box-like housing made from insulating material, and this housing covers the circuit installation surface of circuit board substantially fully.Some otch have been offered above the box-like housing selectively at this.This box-like housing comprises first and second portion, and during the non-measurement of circuit board, when being closed, the first and the second portion that are positioned at the otch both sides are adjacent to each other.Protective cover be transparent or semitransparent and first and second portion flexible.
In order to realize above-mentioned target, the circuit board that has protective cover that the present invention relates to comprises: the circuit substrate with circuit installation surface; Make and be used for the box protection cover (20,120) that the circuit installation surface with circuit substrate covers substantially fully by insulating material; Be opened in the otch (21) above the above-mentioned protective cover selectively.This box-like housing comprises first and second portion, and during the non-measurement of circuit board, when being closed, the first and the second portion that are positioned at the otch both sides are adjacent to each other.Protective cover be transparent or semitransparent and first and second portion flexible.
Description of drawings
Figure 1A is a plane graph that has the circuit board of making according to the first embodiment of the present invention with protective cover;
Figure 1B is the profile of upwards looking along the straight line A-A` among Figure 1A.
Fig. 2 is the view in the protective cover example vertical section shown in Figure 1A.
Fig. 3 is the perspective view of a liquid crystal display device making of second embodiment according to the present invention;
Fig. 4 A and 4B are to be respectively a plane graph and a profile that has the circuit board of conventional protective cover.
Embodiment
With reference to the accompanying drawings the present invention is described in detail.
Figure 1A and 1B are depicted as a circuit board that has the protective cover of making according to one embodiment of present invention.In Figure 1A and 1B, describe to be omitted for the details of wiring situation on the circuit board, and just the extracting section relevant with the present invention come out and in addition processing and amplifying so that the reader understanding.
Can see that from Figure 1A many measurement pad 11 or circuit adjustment element (not shown)s that voltage/signal waveform is measured that are used for are arranged on the surface of rectangular circuit board 10.A box-like protective cover 20 of being made by insulating material is installed in above the circuit board 10.For example, protective cover 20 can be that 0.3 to 0.5mm transparent elastic plastic plate is made by thickness.Protective cover 20 spatially hides the circuit installation surface (10a) of circuit board 10 to get up fully, can prevent that the dust or the foreign matter in the external world from falling above the circuit board 10 by protective cover.
On protective cover 20, offer criss-cross otch 21 corresponding to the position of measuring pad 11 or circuit adjustment element.Four zones that marked off by each otch 21 have constituted the flexible part 25 on the protective cover.The far-end of flexible part 25 can be along the direction perpendicular to protective cover 20 on the protective cover, and just measuring probe 31 (back will the be described) direction inserting/extract produces displacement, with opening/closing otch 21.Except at measurement/conditioning period, otch 21 all is in closed condition and does not form the slit, can prevent entering of extraneous dust or foreign matter fully.
Except cross, otch 21 can also have other various types of shapes.As star, H, U or Y font etc.Certainly, it also may have the shape of any other type.
Measurement procedure to circuit board 10 describes below.Beginning is during surveying work, at first, measuring probe 31 is pushed among the measurement pad 11 corresponding otch 21 with as measurement target, moves down measuring probe then, widens otch 21 simultaneously.At this moment, along with moving down the measuring probe 31 with conical top, flexible part 25 beginnings are opened gradually on the protective cover adjacent with otch 21.Shown in Figure 1B, when measuring probe 31 contacted with measurement pad 11, flexible part 25 was flared to maximum position.
With measure pad 11 and contact after, the measuring probe 31 of insertion protective cover 20 stops the process that it moves down.
During measuring probe 31 and measurement pad 11 kept in touch, flexible part 25 was in the state that measured probe 31 is depressed and opened always on the protective cover.
After the measurement end of job of measuring probe 31, measuring probe 31 disengages with measurement pad 11 and moves up, and then it is extracted from otch 21.At this moment, because flexible part 25 has elasticity (restoring force) on the protective cover adjacent with otch 21, after measuring probe 31 is extracted from protective cover 20, they will return to original closed condition, and just otch 21 residing states are identical before measuring probe 31 inserts.
According to present embodiment,, make protective cover 20 during non-measurement, remain on closed state owing on protective cover 20, offered the otch 21 that is used to insert measuring probe 31.Therefore, can prevent that extraneous dust or foreign matter from entering circuit board 10, in order to avoid between circuit connection, be short-circuited and leaky.
Because protective cover 20 is to be made by the transparent elastic plastics of individual layer, see through protective cover 20 and can be clear that circuit board 10 lip-deep states, therefore can not cause obstruction to measurement.
As shown in Figure 2, produce electromagnetic interference (EMI) to external world in order to prevent circuit board 10, can be on the surface of the plastic casing 22 that is used for making protective cover 20 a kind of metallic film of making 23 of the about 10nm of preparation one bed thickness by aluminium, chromium, silver, copper or tin.Like this, protective cover 20 will have good function of shielding.If prepare metallic film 23 with ITO (tin indium oxide), then the thickness of this film can make 30 to 50nm.It is transparent or semitransparent that metallic film 23 with this thickness can make protective cover 20 look, thereby possesses the effect that same made measurement operation is carried out smoothly with the protective cover of being made by monolayer plastic.
Usually, on plastic casing 22, after the preparation layer of metal film 23, also on the surface of film 23, apply the thinner resin bed 24 (or diaphragm) of one deck, in order to avoid metallic film 23 is damaged.In this case, as shown in Figure 2, otch 21 will pass plastic casing 22, metallic film 23 and the resin bed 24 that constitutes protective cover 20.
Prepare the aforesaid plastic casing that has metallic film 23 and resin bed 24, need earlier on the plastic substrate that has with the one flat plate shape of protective cover 20 identical materials, to prepare metallic film 23, and then on film 23 the thinner one deck resin bed 24 of coating.Then that resulting structure cuts is extremely predetermined size adopts the method for vacuum molding or mold pressing that it is pressed into housing, has promptly made protective cover 20.
Make protective cover 20 have anti electromagnet interference function, can adopt several commercial films.They are by making the aluminium vapour deposition on polyethylene terephthalate (PET) film, its light transmittance is adjusted in 15-50%.On the surface of aluminium film, be attached with layer protecting film equally, to guarantee the insulation characterisitic of protective cover.
In the above embodiments, protective cover 20 is made of plastics (metallic film 23 and resin bed 24 are arranged on it) fully.Yet protective cover 20 might not be made of plastics fully, and can only use plastics at otch 21 and flexible part 25 places.For example, only the measurement on the shelter-clad of routine/adjusting otch 221 (Fig. 4 A and 4B) plastic sheet of locating to adhere is offered otch 21 then on this piece plastic sheet.Adopt this structure, can obtain the effect of top embodiment equally.
Below with reference to Fig. 3 second embodiment of the present invention is described.In this embodiment, the circuit board that has the protective cover that first embodiment according to the invention makes is used as the circuit board of a liquid crystal display device.Fig. 3 schematically describes out the circuit board that has protective cover and is positioned in state on the liquid crystal display device.
Circuit board 100 and liquid crystal display device 200 are connected to each other by line 300.Side at liquid crystal display device 200 has many gate terminals and drain terminal, and line 300 is used for realizing the handshaking between these terminals and the circuit board 100.Be stamped a transparent plastics protective cover 120 on the circuit board 100.On circuit board 100, be provided with and measure pad 111 and circuit adjustment element 112.
Position corresponding to measurement pad 111 on the circuit board and circuit adjustment element 112 on protective cover 120 offers star otch 121.Protective cover 120 is that 0.3 to 0.5mm plastics are made by thickness, has sufficiently high elasticity.Like this, after circuit adjustment bar 131 inserts one of them otch 121, in the process that it moves down, the part at contiguous otch 121 places will move and begins to open with adjusting rod 131 on the protective cover 120.
, can begin to regulate by circuit board 100 and 300 pairs of liquid crystal display devices 200 of line with after circuit adjustment element 112 contacts at circuit adjustment bar 131 with adjusting rod 131.After regulating EO, circuit adjustment bar 131 disengages with circuit adjustment element 112.In the process that adjusting rod 131 is extracted from otch 121, the part at contiguous otch 121 places will move and otch will be closed with adjusting rod 131 on the protective cover 120.
After circuit adjustment bar 131 is extracted from protective cover 120 fully, the part at contiguous otch 121 places will return to original closed condition on the protective cover 120, circuit board 100 is isolated from the outside come.Otch 121 in the present embodiment is a star, but as shown in Figure 3, also can use the otch 122 or the U-shaped otch 123 of H shape.
In the present embodiment protective cover 120 used materials have with first embodiment in the identical characteristic of protective cover material.Therefore, except the measurement and conditioning period of circuit board 100, protective cover 120 can prevent that all extraneous dust or foreign matter from entering among the circuit board 100.
Except using measuring probe to carry out the measuring operation, can under the situation that can see the circuit board operating state from the outside, carry out for the adjusting operation of circuit board 100.With in the circuit board adjustment process, can only compare by the situation that the otch on the protective cover is observed, the former performance accuracy improves a lot.And, when preparation layer of metal film on protective cover 120, can also play shielding action to the electromagnetic interference that circuit board 100 produces to external world.
The present invention is not only limited to two above-mentioned embodiment.Suppose at one and be stamped a protective cover above the circuit board that if necessary, measuring probe can insert and contacts with specified portions on the circuit board by the otch on the protective cover in order to the circuit board and the external world are separated.A circuit board so not only can be used as the circuit board of liquid crystal display device certainly, and can be used for any other technical field.
As mentioned above, according to the present invention, measuring probe be inserted into by the otch on the protective cover until with circuit board on the contacted process of specified portions in, can successfully move with the adjacent part of otch on the protective cover with measuring probe.After measuring probe was extracted from protective cover, part adjacent with otch on the protective cover can return to original closed condition fully.Therefore, can significantly reduce the generation of the phenomenon that the extraneous dust that can occur generally speaking or foreign matter enter circuit board.
Be visible on the material protective cover behind the preparation layer of metal film, can also prevent electromagnetic the leaking that circuit board produces.
Claims (17)
1. circuit board protective cover is characterised in that it comprises:
The box-like housing (20,120) that the circuit installation surface of circuit board (10) is covered substantially fully by insulating material being used for of making; With
The otch of on above-mentioned box-like housing, offering selectively (21),
Wherein, above-mentioned box-like housing comprises first and second portion, during the non-measurement of foregoing circuit plate, when being closed, the above-mentioned first and the above-mentioned second portion that are positioned at above-mentioned otch both sides are adjacent to each other, and above-mentioned protective cover is that transparent or semitransparent and above-mentioned first and above-mentioned second portion are flexible.
2. protective cover as claimed in claim 1 is characterized in that, its upper cut form correspondingly with the predetermined detection position (11,111,112) on the circuit board.
3. protective cover as claimed in claim 1 is characterized in that the otch on it is closed usually, and is opened in the above-mentioned box-like housing time from this insertion at measuring probe (31,131).
4. protective cover as claimed in claim 1 is characterized in that, the shape of its upper cut can be cross, star, H, U and Y shape.
5. protective cover as claimed in claim 1 is characterized in that, is that above-mentioned box-like housing is made of plastics in the part of contiguous above-mentioned otch at least.
6. protective cover as claimed in claim 5 is characterized in that, plastics are selected from a kind of in polyethylene terephthalate thin slice, Merlon and the nylon.
7. protective cover as claimed in claim 1 is characterized in that, above-mentioned box-like housing is to have the plastic casing (22) of metallic film (23) to make by surface-coated.
8. protective cover as claimed in claim 7 is characterized in that, metallic film is that a kind of material that is selected from the oxide of aluminium, chromium, silver, copper, tin and indium tin is made.
9. protective cover as claimed in claim 7 is characterized in that, is coated with one deck thin resin layer (24) above the metallic film again.
10. circuit board that has protective cover is characterized in that it comprises:
Circuit substrate (10,100) with circuit installation surface (10a);
Make and be used for the box protection cover (20,120) that the circuit installation surface with the foregoing circuit substrate covers substantially fully by insulating material; With
Be opened in the otch (21) above the above-mentioned protective cover selectively,
Wherein, above-mentioned protective cover comprises first and second portion, and during the non-measurement of foregoing circuit plate, when being closed, the above-mentioned first and the above-mentioned second portion that are positioned at above-mentioned otch both sides are adjacent to each other; And above-mentioned protective cover is that transparent or semitransparent and above-mentioned first and above-mentioned second portion are flexible.
11. circuit board as claimed in claim 10 is characterized in that, makes/is equipped with one on the circuit installation surface of foregoing circuit substrate at least and measure a pad (11,111) and a circuit adjustment element (112), and,
Above-mentioned otch forms correspondingly with the measurement pad and the position of circuit adjustment element on the circuit installation surface.
12. circuit board as claimed in claim 10 is characterized in that, above-mentioned otch is closed usually, and is opened when measuring probe (31,131) is from the above-mentioned protective cover of this insertion.
13. circuit board as claimed in claim 10 is characterized in that, the shape of above-mentioned otch can be cross, star, H, U and Y shape.
14. circuit board as claimed in claim 10 is characterized in that, is that above-mentioned protective cover is made of plastics in the part of contiguous above-mentioned otch at least.
15. circuit board as claimed in claim 10 is characterized in that, above-mentioned protective cover is to be made by the plastics moulded body (22) that simultaneously is coated with metallic film (23).
16. circuit board as claimed in claim 15 is characterized in that, is coated with one deck thin resin layer (24) above the metallic film again.
17. circuit board as claimed in claim 10 is characterized in that, the foregoing circuit plate is by being electrically connected with a liquid crystal display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02141281 CN1201646C (en) | 2002-07-05 | 2002-07-05 | Protective hood for circuit board and circuit with protective hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02141281 CN1201646C (en) | 2002-07-05 | 2002-07-05 | Protective hood for circuit board and circuit with protective hood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1466411A CN1466411A (en) | 2004-01-07 |
| CN1201646C true CN1201646C (en) | 2005-05-11 |
Family
ID=34147752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02141281 Expired - Lifetime CN1201646C (en) | 2002-07-05 | 2002-07-05 | Protective hood for circuit board and circuit with protective hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1201646C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8487235B2 (en) * | 2009-04-13 | 2013-07-16 | Rockwell Automation Technologies, Inc. | Photoelectric sensor for sensing a target at a predetermined location |
-
2002
- 2002-07-05 CN CN 02141281 patent/CN1201646C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1466411A (en) | 2004-01-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: NIPPON ELECTRIC CO., LTD. Free format text: FORMER OWNER: NEC LCD TECHNOLOGY CO.,LTD Effective date: 20100608 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: KANAGAWA-KEN, JAPAN TO: TOKYO, JAPAN |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20100608 Address after: Tokyo, Japan Patentee after: NEC Corp. Address before: Kanagawa, Japan Patentee before: NEC LCD Technologies, Ltd. |
|
| ASS | Succession or assignment of patent right |
Owner name: JINZHEN CO., LTD. Free format text: FORMER OWNER: NEC CORP. Effective date: 20130510 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130510 Address after: Samoa Apia hiSoft Center No. 217 mailbox Patentee after: Jinzhen Co.,Ltd. Address before: Tokyo, Japan Patentee before: NEC Corp. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20050511 |
|
| CX01 | Expiry of patent term |