CN2110250U - Vision protector - Google Patents
Vision protector Download PDFInfo
- Publication number
- CN2110250U CN2110250U CN 91230367 CN91230367U CN2110250U CN 2110250 U CN2110250 U CN 2110250U CN 91230367 CN91230367 CN 91230367 CN 91230367 U CN91230367 U CN 91230367U CN 2110250 U CN2110250 U CN 2110250U
- Authority
- CN
- China
- Prior art keywords
- circuit
- vision protector
- sheet metal
- inductance
- oscillatory
- 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.)
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Abstract
The utility model relates to a sight protector which belongs to a health care device of a human body, particularly to a health care device for eyes. The utility model comprises an LC oscillation circuit, a detection drive circuit and a buzzer, wherein a rotatable metal sheet is arranged on an electrical inductor L of the LC oscillation circuit. The sight protector can be worn on heads. The utility model has the advantages of portability, simple operation and use, no noise of contact operation and long service life, and is especially suitable for children.
Description
The utility model belongs to a kind of purpose personal-care device, particularly relates to a kind of protection device of eyes.
Existing vision protection device; it all is wear-type; the for example golden wise man of one-tenth applies for that Dec 29 nineteen ninety application number is 90227133.4 patent " vision protector ", and it is made of magnet, corner switch, integrated circuit and the loudspeaker of elasticity head-clamp, control contact switch.The wear-type vision protector is to user's inconvenience, and children dislike wearing usefulness.Owing to there is contact switch, noise is arranged in use, and the oxidation easy to wear, easy of the contact of contact switch.
The purpose of this utility model be to provide a kind of contactless, use easy to operate non-wear-type vision protector.
The utility model is to solve by following technical scheme: vision protector; comprise housing (5), be installed in circuit board (4), news Chinese percussion instrument HC in the housing (5); be characterized in having LC oscillatory circuit, detection promotion circuit, sheet metal (2); the input end that detection promotes circuit is delivered in the output of LC oscillatory circuit; the load that detection promotes circuit is news Chinese percussion instrument HC; sheet metal (2) is suspended on the ring (3) that is supported on the circuit board (4), and the position that sheet metal (2) hangs is corresponding with the position that circuit board (4) is gone up the inductance L in the LC oscillatory circuit.
The LC oscillatory circuit is by inductance L
1, L
2, transistor BG
1, capacitor C
1, resistance R
1, R
2The inductance of three-point oscillatory circuit that constitutes.Detection promotes circuit by transistor BG
2, BG
3, be connected on public end A of circuit and transistor BG
2Diode D between the output terminal B
1Constitute.Sheet metal (2) is the feeromagnetic metal sheet.The sheet metal (2) that is suspended on the ring (3) can depart from the position that circuit board (4) is gone up inductance L in the LC oscillatory circuit on the direction of all around.The LC oscillatory circuit can also be a Colpitts oscillation circuit.
The utility model is non-wear-type, and is easy to carry, use simple to operately, is specially adapted to children.Because the utility model does not use the contact as switch, contactless action noise, long service life.
The utility model in use, generally place coat pocket, open potentiometer switch W, circuit power is connected, because sheet metal (2) is the inductance L of pressing close in the LC oscillatory circuit in normal condition, sheet metal (2) can produce eddy current loss because of electromagnetic induction, makes the LC oscillatory circuit can not satisfy oscillating condition, LC oscillatory circuit failure of oscillation.True when user's abnormal sitting posture, when the distance of reading a book, write was too near, because forward lean, crooked, sheet metal (2) left inductance L and makes the LC oscillatory circuit satisfy oscillating condition and starting oscillation, transistor BG
1Output terminal B has signal output, and this output signal is via diode D
1, transistor BG
2The multiplication of voltage detecting circuit formed of emitter junction carry out after the detection again by transistor BG
2, BC
3Promote news Chinese percussion instrument HC behind the complex pipe power amplifier of forming and send alarm sound, the prompting user notes sitting posture and sees the distance of written word, to reach the purpose of protection eyes.
Fig. 1 is a vision protector normal condition structural representation.
Fig. 2 is a vision protector alarm status architecture synoptic diagram.
Fig. 3 is the vision protector circuit theory diagrams.
Embodiment:
The power supply of vision protector is with 1.5 volts of button cells.
Sheet metal (2) opens hole, a garden with iron plate, one end and cover hangs on the ring (3).Inductance L
1, L
2Be 0.5 μ H.Capacitor C
1Be 200PF, capacitor C
2, C
3, C
4, C
5Be 0.01 μ F.Resistance R
1, R
2Be respectively 75K Ω, 100K Ω.Transistor BG
1, BG
2Use 3DG80, transistor BG
3Use CS9015.Diode D
1Be 2AP9.Potentiometer switch W is 47K Ω.News Chinese percussion instrument HC-12 electromagnetic buzzer.
Diode D
1The public end A of anodal connection circuit, negative pole meets the output terminal B of LC oscillatory circuit.
Housing (5) and on to collude folder (1) made of plastic, and handle through chromium plating on the surface.Collude and press from both sides also available metal.Collude folder (1) and be installed on the top of housing (5) one sides.
Ring (3) is welded on the circuit board (4).Circuit board (4) is screwed on housing (5), and the degree of tilt of circuit board (4) can be adjusted.
Claims (6)
1, vision protector comprises housing (5), is installed in circuit board (4), news Chinese percussion instrument HC in the housing (5), it is characterized in that having:
A) LC oscillatory circuit, detection promote circuit, and the output signal of LC oscillatory circuit is delivered to detection and promoted circuit, and the load that detection promotes circuit is news Chinese percussion instrument HC;
B) sheet metal (2), sheet metal (2) are suspended on the ring (3) that is supported on the circuit board (4), and the position that sheet metal (2) hangs is corresponding with the position that circuit board (4) is gone up inductance L in the LC oscillatory circuit.
2, vision protector according to claim 1 is characterized in that the LC oscillatory circuit is by inductance L
1, L
2, transistor BG
1, capacitor C
1, resistance R
1, R
2The inductance of three-point oscillatory circuit that constitutes.
3, vision protector according to claim 1 is characterized in that detection promotes circuit by transistor BG
2, BG
3, be connected on public end A of circuit and transistor BG
1Diode D between the output terminal B
1Constitute.
4, vision protector according to claim 1 is characterized in that sheet metal (2) is the feeromagnetic metal sheet.
5, vision protector according to claim 1 is characterized in that folder (1) is colluded in the upper end of housing (5) one sides.
6, vision protector according to claim 1, the sheet metal (2) that it is characterized in that being suspended on the ring (3) can depart from the position that circuit board (4) is gone up inductance L in the LC oscillatory circuit on the direction of all around.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91230367 CN2110250U (en) | 1991-10-22 | 1991-10-22 | Vision protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91230367 CN2110250U (en) | 1991-10-22 | 1991-10-22 | Vision protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2110250U true CN2110250U (en) | 1992-07-15 |
Family
ID=4935708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91230367 Granted CN2110250U (en) | 1991-10-22 | 1991-10-22 | Vision protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2110250U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014406A (en) * | 2017-03-16 | 2017-08-04 | 北京航空航天大学 | A kind of autodyne fraction eddy current displacement sensor for magnetic levitation bearing system |
-
1991
- 1991-10-22 CN CN 91230367 patent/CN2110250U/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014406A (en) * | 2017-03-16 | 2017-08-04 | 北京航空航天大学 | A kind of autodyne fraction eddy current displacement sensor for magnetic levitation bearing system |
| CN107014406B (en) * | 2017-03-16 | 2020-06-12 | 北京航空航天大学 | Self-differential eddy current displacement sensor for magnetic suspension bearing system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |