CN2295242Y - Myopia-prevention computer keyboard - Google Patents
Myopia-prevention computer keyboard Download PDFInfo
- Publication number
- CN2295242Y CN2295242Y CN 97206220 CN97206220U CN2295242Y CN 2295242 Y CN2295242 Y CN 2295242Y CN 97206220 CN97206220 CN 97206220 CN 97206220 U CN97206220 U CN 97206220U CN 2295242 Y CN2295242 Y CN 2295242Y
- Authority
- CN
- China
- Prior art keywords
- computer keyboard
- infrared
- keyboard
- model
- myopia
- 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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- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The utility model relates to a myopia-prevention computer keyboard which is a computer keyboard device, and belongs to the technical field of electricity. Both sides of the computer keyboard are fixed with a pair of symmetric rotary knobs on which telescopic rods are fixed, and the tail ends of the telescopic rods are respectively provided with an infrared emitter and an infrared receiver. When the utility model is used, the positions of the infrared emitter and the infrared receiver can be regulated as required, and monitoring distance is well determined. An operator's sitting posture and apparent distance can be effectively specified and monitored to decrease visual impairment.
Description
The utility model relates to the key board unit of computing machine, belongs to electro-technical field.
At present, computer is quite universal in enterprises and institutions and family.But many people, especially the teenager often wallows in before the computer for a long time, do not note the proper operation posture again, when using computer in order to see clearlyer, usually can't help with forward lean, eyes are very near from screen, often between operation can cause asthenopia, existing keyboard is not reminded the myopia prevention device of people's sitting posture, sighting distance.In addition, the magnetic field that computer produced is healthy totally unfavorable to the people's, and display distributes radiation to all directions, and the operator should keep and the distance of display terminal more than 0.7 meter, and like this, electromagnetic intensity can descend 80%, can significantly reduce the infringement of magnetic field to the people.
The utility model remedies the deficiency of prior art, and a kind of myopia prevention computor-keyboard with infrared warning device is provided.
The purpose of this utility model realizes by following technical measures.
The knob of fixing a pair of symmetry is fixed with expansion link on the knob in active computer keyboard both sides, and the expansion link end is equipped with infrared transmitter and infrared receiver respectively.
The knob of above-mentioned two symmetries by a transverse axis by connecting under the keyboard.
Above-mentioned transverse axis is telescopic.
The circuit of infrared emission and infrared reception adopts prior art.
The utility model has installed infrared transmitter and infrared receiver additional on common keyboard, can regulate the position of infrared transmitter and infrared receiver during use as required, determine to monitor distance, when operator's eyes when screen is too near, its head has blocked ultrared emission and reception, alarm in the circuit is sounded, prompting operation person is far away from screen, keep suitable distance, can be to operator's sitting posture, sighting distance is carried out effective standard and monitoring, is convenient to the people and forms good operating habit, conscious attention eye hygiene, reduce inpairment of vision, reduce the injury of electromagnetic field simultaneously the people.
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the schematic top plan view of the utility model expansion link when being folded down.
Fig. 2 is the front elevational schematic of the utility model expansion link when turning up.
Fig. 3 is the utility model synoptic diagram knob, transverse axis, expansion link, infrared transmitter and infrared receiver connection diagram.
Fig. 4 is embodiment infraluminescence partial circuit figure.
Fig. 5 is the infrared reception control section of an embodiment circuit diagram.
Wherein, 1. QWERTY keyboard, 2. knob, 3. expansion link, 4. transverse axis, 5. infrared transmitter, 6, infrared receiver.
The label of electric device is identical with prior art among Fig. 4 Fig. 5, R. resistance, C. electric capacity, D. diode, BG. triode, B. transformer, K. switch, J. relay, each element by each circuit of speciality habit gives the inferior horn serial number respectively, and LED is the infraluminescence pipe among Fig. 4, and M is a Warning door bell among Fig. 5.
Embodiment. structure is as Figure 1-3.
The knob 2 of fixing a pair of symmetry by connecting under the keyboard, is fixed with expansion link 3 by a transverse axis 4 on the knob 2 in existing standard computer keyboard 1 both sides, and expansion link 3 ends are equipped with infrared transmitter 5 and infrared receiver 6 respectively.
The infraluminescence partial circuit as shown in Figure 4, by BG
1, BG
2Two different in nature transistors are formed complementary free-running multivibrator, wherein, and BG
1: ZK, BG
2: 3DG12, infraluminescence pipe LED directly is connected on BG as load
2Collector.When the circuit starting of oscillation, luminous infrared pulse light, the about 1000Hz of frequency; D
1-D
4: 2CZ; R
1: 360 Ω, R
2: 100k, R
3: 200k, R
4: 10 Ω; C
1: 220 μ F, C
2: 0.01 μ F.
Infrared reception control section circuit as shown in Figure 5, the infrared pulse light that the infraluminescence pipe sends is by BG in the infrared reception control section circuit
1' the photoelectric tube reception, through BG
4'-BG
6' third stage amplifier formed amplifies, amplified signal is through D
1', D
2' the multiplication of voltage detection, the DC component of output makes and relay J
1The BG that connects
7', BG
8' conducting, relay J
1Adhesive, its normally closed contact K
1Disconnect, with K
1The regulator block 7805 no-output voltages that connect, the Doorbell alarm device that is connected on the regulator block 7805 does not ring; In case BG
1' infrared light that receives covered J
1Just discharge its normally closed contact K
1Connect, regulator block 7805 output voltages, the doorbell power connection sends sound, reminds the people to note reading/writing distance.Resistance R among Fig. 5 ' unit be Ω, capacitor C ' unit is F.BG in the circuit
1', BG
2' be connected into complex pipe, improved the receiving ability of circuit, the negative full feedback direct current biasing and the BG of third stage amplifier to low-light
3' the interchange negative feedback, make circuit working stable, be fit to long time continuous working.Luminotron is with 5GLB type miniwatt infraluminescence pipe, each transistor β between 50-70, relay J 1 JPX-13F type, focuser, BG will be loaded onto in the photoelectric tube front
1' model: SDT8276, BG
2'-BG
7' model: 3DG100, BG
8' model: 3DG130.
Claims (3)
1. a myopia prevention computor-keyboard is characterized in that, the knob of fixing a pair of symmetry is fixed with expansion link on the knob in the computer keyboard both sides, and the expansion link end is equipped with infrared transmitter and infrared receiver respectively.
2. myopia prevention computor-keyboard as claimed in claim 1 is characterized in that, the knob of described two symmetries by a transverse axis by connecting under the keyboard.
3. myopia prevention computor-keyboard as claimed in claim 1 is characterized in that described transverse axis is telescopic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97206220 CN2295242Y (en) | 1997-03-18 | 1997-03-18 | Myopia-prevention computer keyboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97206220 CN2295242Y (en) | 1997-03-18 | 1997-03-18 | Myopia-prevention computer keyboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2295242Y true CN2295242Y (en) | 1998-10-21 |
Family
ID=33926268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97206220 Expired - Fee Related CN2295242Y (en) | 1997-03-18 | 1997-03-18 | Myopia-prevention computer keyboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2295242Y (en) |
-
1997
- 1997-03-18 CN CN 97206220 patent/CN2295242Y/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 |