CN2725965Y - Photoelectric notebook anti-theft apparatus - Google Patents
Photoelectric notebook anti-theft apparatus Download PDFInfo
- Publication number
- CN2725965Y CN2725965Y CN 200420026734 CN200420026734U CN2725965Y CN 2725965 Y CN2725965 Y CN 2725965Y CN 200420026734 CN200420026734 CN 200420026734 CN 200420026734 U CN200420026734 U CN 200420026734U CN 2725965 Y CN2725965 Y CN 2725965Y
- Authority
- CN
- China
- Prior art keywords
- notebook
- desktop
- alarm
- light emitting
- emitting diode
- 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
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- Alarm Systems (AREA)
Abstract
The utility model relates to a photoelectric notebook anti-theft apparatus. An LED 1 is arranged above a concave lens 4. Two light sensitive diodes 2 are arranged in the holes which are arranged at the two sides of the concave lens. A switch s is turned on. The LED 1 shines. Ray is projected on the desktop through radiation of the concave lens 4. The ray is projected on an assembling case3 through the reflecting of the desktop. A round spot is formed. Because the light sensitive diode 2 is at the edge of the round spot. When someone moves the notebook, the distance between the device which is arranged at the lower part of the notebook and the desktop can be increased. The area of the round spot also can be increased. The ray is projected on the light sensitive diode 2, L2 in a circuit diagram. Resistance of L2 can be decreased and be amplified through VT1, VT2, VT3. Current flows by an oscillating circuit and a loudspeaker B. At the moment, an alarm sound is made to have an alarm by the loudspeaker B.
Description
Affiliated technical field
The utility model relates to a kind of photo-electric notebook alarm.
Background technology
At present, the notebook alarm is not many on market to be seen, modal is mechanical, but mechanical reaction is sensitive inadequately; Also have and adopt alternate manner, but complex structure mostly, manufacturing cost is high slightly.
Summary of the invention
The purpose of this utility model provide a kind of simple in structure, cost is low, sensitive photo-electric notebook alarm.
The purpose of this utility model is achieved in that
A kind of photo-electric notebook alarm contains a light emitting diode, concave lens, two light emitting diodes and assembling shell.Assembling shell can be made by hard opaque material (as plastics etc.), and is light tight to guarantee.Wherein, light emitting diode is installed in the top of concavees lens, in the groove that the both sides that two photodiodes are installed in concavees lens set, open lumination of light emitting diode behind the switch, light becomes through concavees lens to be dispersed, project that the desktop back reflection returns assembling shell and on housing, form a round spot, when computer is moved in people's attempt, device will increase with the distance of desktop, the area of circle spot also will increase, and the photodiode of justifying spot edge will be mapped to by illumination and make its resistance decreasing, and circuit will be switched on, electric current is exaggerated, and the oscillatory circuit work in the circuit is also reported to the police by loudspeaker.
Beneficial effect
The utility model has the advantages that:
1. be quick on the draw;
2. volume is small and exquisite, can not damage computer during installation;
3. simple in structure, easily manufactured;
4. material is common, and cost is low.
Description of drawings
Concrete structure of the present utility model is provided by the following drawings:
Accompanying drawing 1 is the cut-open view of photoelectric reacting device.
Accompanying drawing 2 is vertical views of photoelectric reacting device.
Accompanying drawing 3 is upward views of photoelectric reacting device.
Accompanying drawing 4 is circuit diagrams of photovoltaic reaction circuit.
1-light emitting diode 2-photodiode 3-assembling shell 4-concavees lens
5-holding screw 6-holding screw 7-holding screw 8-assembling screw 9-vocal hole 10-resistance regulating hole
Embodiment
The utility model also will be further described in conjunction with above accompanying drawing:
With light emitting diode 1 is L in the circuit diagram
1, photodiode 2 is the L in the circuit diagram
2Be fixed in the circular hole on the assembling shell 3 with holding screw 5 respectively, concavees lens are fixed on the housing with assembling screw 6.System of device and the common composition of desktop.Open switch, light emitting diode 1 is luminous, light projects desktop after concavees lens 4 are dispersed, project on the assembling shell 3 after the desktop reflection, forms a round spot, because photodiode 2 is in round spot edge, when people's removable computer, being contained in the device under the notebook and the distance of desktop will increase, and the area of circle spot also will increase, light will be mapped on the photodiode 2, L
2Resistance will diminish, pass through VT
1, VT
2, VT
3Amplify, electric current flow through oscillatory circuit and loudspeaker B, this moment, the loudspeaker B sound that gives the alarm was reported to the police.
Claims (3)
1. a photo-electric notebook alarm is characterized in that being made of light emitting diode (1), concavees lens (4), photodiode (2), assembling shell.
2. photo-electric notebook alarm according to claim 1, it is characterized in that light emitting diode (1) is fixed on concavees lens (4) top with holding screw (6), two photodiodes (2) use holding screw (5), (6) to be fixed in the hole of concavees lens (4) both sides setting respectively, light emitting diode (1) is connected with circuit board with photodiode (2), and the circuit board operating voltage is 3 volts.
3. photo-electric notebook alarm according to claim 1 is characterized in that on the box that device is fixed vocal hole, resistance regulating hole and battery cavities being set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420026734 CN2725965Y (en) | 2004-04-27 | 2004-04-27 | Photoelectric notebook anti-theft apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420026734 CN2725965Y (en) | 2004-04-27 | 2004-04-27 | Photoelectric notebook anti-theft apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2725965Y true CN2725965Y (en) | 2005-09-14 |
Family
ID=35040678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420026734 Expired - Fee Related CN2725965Y (en) | 2004-04-27 | 2004-04-27 | Photoelectric notebook anti-theft apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2725965Y (en) |
-
2004
- 2004-04-27 CN CN 200420026734 patent/CN2725965Y/en not_active Expired - Fee Related
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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 |