CN109284031A - Projected light keyboard - Google Patents
Projected light keyboard Download PDFInfo
- Publication number
- CN109284031A CN109284031A CN201710603706.0A CN201710603706A CN109284031A CN 109284031 A CN109284031 A CN 109284031A CN 201710603706 A CN201710603706 A CN 201710603706A CN 109284031 A CN109284031 A CN 109284031A
- Authority
- CN
- China
- Prior art keywords
- circuit
- grating
- light
- frequency
- reflective condition
- 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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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0425—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected
- G06F3/0426—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking fingers with respect to a virtual keyboard projected or printed on the surface
Abstract
The invention discloses a kind of projected light keyboards, including cross-excitation light source, light frequency synthesizer, grating encoder, optical frequency reflective condition captures circuit, energy-location position circuit, encoding coordinate route marker, code value output circuit, cross-excitation light source is connected with light frequency synthesizer and grating encoder respectively, the each grating encoding point of grating encoder has corresponded to a cross-excitation light source, optical frequency reflective condition captures circuit and is arranged on grating encoder, optical frequency reflective condition captures the reflection capture point on circuit and the grating encoding point on grating encoder corresponds, optical frequency reflective condition capture circuit output end is connected to energy-location position circuit, energy-location position circuit connection is to encoding coordinate route marker, encoding coordinate route marker is connected to code value output circuit.The present invention is simple and efficient keyboard triggering mode, can save design space and equipment volume.
Description
Technical field
The present invention relates to a kind of electronic equipment more particularly to a kind of projected light keyboards.
Background technique
Touch-tone keyboard is since volume is bigger, it is very inconvenient to carry, and the peace that laptop equipment is included
Dress formula keyboard can occupy very large space and cause keyboard of notebook computer part due to itself being also to belong to plastic key type
Biggish volume.And the touch input mode of the equipment such as mobile phone is mainly inputted using fixed several fingers at present, and
It cannot achieve the full finger input of the both hands as computor-keyboard, therefore input efficiency and quality can be reduced.
Summary of the invention
The purpose of the present invention: providing a kind of projected light keyboard, can throw when needing keyboard to input in electronic equipment front end
The light keyboard of projection is projected, to realize efficient keyboard-type input.
To achieve the goals above, the technical scheme is that
A kind of projected light keyboard, including the capture of cross-excitation light source, light frequency synthesizer, grating encoder, optical frequency reflective condition
Circuit, energy-location position circuit, encoding coordinate route marker, code value output circuit, the cross-excitation light source respectively with light
Frequency synthesizer is connected with grating encoder, and each grating encoding point of the grating encoder has corresponded to a cross-excitation
Light source, the optical frequency reflective condition capture circuit are arranged on grating encoder, and the optical frequency reflective condition captures circuit
On reflection capture point and grating encoder on grating encoding point correspond, the described optical frequency reflective condition capture circuit is defeated
Outlet is connected to energy-location position circuit, and the energy-location position circuit connection is described to encoding coordinate route marker
Encoding coordinate route marker be connected to code value output circuit.
Above-mentioned projected light keyboard, wherein the light frequency synthesizer uses hard crystal and excites thin slice, described
Hard crystal excites thin slice rear end to drive hard crystal that thin slice is excited to generate fixed frequency signal by frequency excitation curing circuit
Wave.
Above-mentioned projected light keyboard, wherein the optical frequency reflective condition capture circuit uses quartz-crystal needle and ties side by side
Structure, the optical frequency reflective condition capture the quartz-crystal needle cluster progress frequency signal that each reflection capture point passes through front end on circuit
The acquisition of wave.
Above-mentioned projected light keyboard, wherein the energy-location position circuit is selected by frequency energy trigger signal
Middle smooth keyboard code value triggering state.
Present invention employs fingers to the interference effect of frequency signal wave, to determine whether personnel trigger projected light keyboard
Key, to complete personnel to the triggering input process of light keyboard.Entire projected light keyboard is not necessarily to physical keyboard medium, therefore
Electronic device space is greatly saved, improves the integrated level of electronic equipment, realizes effective saving in material and energy consumption.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of projected light keyboard of the present invention.
Specific embodiment
The following is further explained with reference to the attached drawings the embodiment of the present invention.
It refers to shown in attached drawing 1, a kind of projected light keyboard, including cross-excitation light source 1, light frequency synthesizer 2, grating are compiled
Code device 3, optical frequency reflective condition capture circuit 4, energy-location position circuit 5, encoding coordinate route marker 6, code value output circuit 7,
The cross-excitation light source 1 is connected with light frequency synthesizer 2 and grating encoder 3 respectively, and the grating encoder 3 is every
A grating encoding point has corresponded to a cross-excitation light source 1, and the optical frequency reflective condition capture circuit 4 is arranged in grating encoding
The grating encoding point one on reflection capture point and grating encoder 3 on device 3, on the optical frequency reflective condition capture circuit 4
One is corresponding, and optical frequency reflective condition capture 4 output end of circuit is connected to energy-location position circuit 5, the energy-
Location position circuit 5 is connected to encoding coordinate route marker 6, and the encoding coordinate route marker 6 is connected to code value output circuit 7.
The cross-excitation light source 1 uses two laser light emitting heads, is arranged one between two laser light emitting heads
A adjustable angle, to determine the distance of entire projected light keyboard projected position.It is connected behind each laser light emitting head
One light frequency synthesizer 2.
The light frequency synthesizer 2 uses hard crystal and excites thin slice, and the hard crystal excites thin slice rear end
Drive hard crystal that thin slice is excited to generate fixed frequency signal wave by frequency excitation curing circuit.Light frequency synthesizer 2 passes through
It generates the stimulating frequency signal wave of fixed frequency and frequency signal wave is fused to the radium-shine optical signal of laser light emitting head transmitting
In.
The grating encoder 3 uses standard light keyboard coding distributed architecture, each of on the grating encoder 3
Grating encoding point correspond to a cross-excitation light source 1, make each cross-excitation light source 1 corresponded to one it is corresponding with light keyboard code value
Key position.
The optical frequency reflective condition capture circuit 4 uses quartz-crystal needle parallel construction, the optical frequency reflective condition
Capture the acquisition that each reflection capture point on circuit 4 carries out frequency signal wave by the quartz-crystal needle cluster of front end.The optical frequency
Each reflection capture point on reflective condition capture circuit 4 is made of quartz-crystal needle cluster, and quartz-crystal needle cluster can receive extraneous hair
The frequency signal wave penetrated, and frequency signal wave is transferred to energy-location position circuit 5 of rear end.Since each reflection captures
Grating encoding point on point and grating encoder 3 corresponds, therefore the frequency signal wave of each reflection capture point output is just marked
Determined be the corresponding smooth keyboard code value output of which grating encoding point frequency signal wave.
The energy-location position circuit 5 chooses light keyboard code value triggering state by frequency energy trigger signal.
Since optical frequency reflective condition captures, circuit 4 is received and the frequency signal Bobbi exported is fainter, energy-location position circuit
Driving capability of the 5 inner settings scaling circuit to enhance output threshold voltage signal, the energy-location position
Then circuit 5 is compared threshold voltage signal by the way that received frequency signal wave is converted into corresponding threshold voltage signal
Example amplification, and circuit is chosen to determine whether current light keyboard code value is triggered and choose by internal triggering.
The light keyboard code value that the encoding coordinate route marker 6 is used to choose is converted into the machine code value of system identification,
And the machine code is input to determine being which key is pressed by electronic equipment by code value output circuit 7.
The present invention uses the laser light emitting head on cross-excitation light source 1 to project to keyboard image in the form of laser light
The positions such as external desktop are to form light keyboard, and for keyboard image while projecting to desktop, light frequency synthesizer 2 generates fixed frequency
Frequency signal wave is simultaneously fused in laser light by the frequency signal wave of rate, and there are two laser lights to send out on each cross-excitation light source 1
Penetrate head, and between two laser light emitting heads shape at an angle, two laser light emitting heads transmitting laser light convergent point
It is exactly location point of the light keyboard image projecting on the media such as desktop, meanwhile, the frequency letter merged inside two laser lights
Number wave also intersects convergence on point in the position, since two frequency signal wave frequency rates are identical, is formed on intersecting convergent point
Frequency energy cancellation effect, therefore circuit 4 is captured without frequency signal wave reflection to optical frequency reflective condition.When having finger by light
When on keyboard subpoint, due to the interference of finger, two frequency signal waves for intersecting convergence on the subpoint occur
Interference so that making the energy of the identical frequency signal wave of two frequencies can not offset, and then forms reflection frequency signal wave by light
Frequency reflective condition capture circuit 4 collects, and the optical frequency reflective condition capture collected reflection frequency signal wave of circuit 4, which represents, works as
The light keyboard that preceding cross-excitation light source 1 is formed on the media such as desktop is pressed, because, each light on grating encoder 3
Grid encoded point has corresponded to a keypad code on light keyboard according to standard light keyboard coding distributed architecture, each grating encoding point
Value, since each cross-excitation light source 1 has corresponded to the grating encoding point on a grating encoder 3, makes each cross-excitation light
Source 1 has corresponded to a key position corresponding with light keyboard code value.
Optical frequency reflective condition captures the grating encoding point one on each reflection capture point and grating encoder 3 on circuit 4
As soon as it is corresponding, thus the frequency signal wave that obtains of each reflection capture point has been demarcated be which corresponding key of light keyboard code value by
Lower triggered reflection frequency signal wave, the optical frequency reflective condition capture the reflection capture point on circuit 4 for the anti-of acquisition
Radio frequency rate signal wave is transferred to energy-location position circuit 5, and the energy-location position circuit 5 is by receiving optical frequency reflection
The frequency signal wave of reflection capture point transmission on state capture circuit 4, just can determine that be the triggering of which light keyboard code value frequency
Frequency signal wave is converted into corresponding threshold voltage signal by rate signal wave, energy-location position circuit 5, and by threshold voltage
Signal carries out equal proportion amplification, is then communicated to internal triggering and chooses circuit, carries out valve inside circuit by choosing in triggering
Threshold voltage numerical value is relatively rear, and (threshold voltage signal is higher than when choosing voltage value of setting, and representing received frequency signal wave is to work as
The corresponding reflection frequency signal wave triggered by key pressing of preceding light keyboard code value, rather than other light keyboard code values pair around
The interfering frequency signal wave for answering key to be triggered, because the frequency signal intensity of wave of surrounding other light keyboard code values triggering compares
Weak, the threshold voltage signal converted can be lower than the voltage value of choosing of setting, therefore this interference threshold voltage signal system will
Skip over and do not handle), while selected state voltage and light keyboard code value are exported, it is triggered and is chosen with the current light keyboard code value of determination,
The selected state voltage and light keypad code that the encoding coordinate route marker 6 is exported by reading energy-location position circuit 5
Value represents the corresponding key of current light keyboard code value and is pressed and chooses, and then the encoding coordinate route marker 6 is by light keypad code
Value is converted into the machine code value of system identification, and the machine code is input to electronic equipment with determination by code value output circuit 7
It is which key is pressed, and then realizes the key-press input function of entire light keyboard.
In conclusion keyboard triggering mode is simple and efficient present invention employs frequency hop inductive mode, it can be effective
Save design space and equipment volume.
Claims (4)
1. a kind of projected light keyboard, it is characterised in that: including cross-excitation light source (1), light frequency synthesizer (2), grating encoding
Device (3), optical frequency reflective condition capture circuit (4), energy-location position circuit (5), encoding coordinate route marker (6), code value output
Circuit (7), the cross-excitation light source (1) is connected with light frequency synthesizer (2) and grating encoder (3) respectively, described
The each grating encoding point of grating encoder (3) corresponded to a cross-excitation light source (1), the optical frequency reflective condition capture
Circuit (4) is arranged on grating encoder (3), the reflection capture point and light in optical frequency reflective condition capture circuit (4)
Grating encoding point on grid encoder (3) corresponds, and described optical frequency reflective condition capture circuit (4) output end is connected to energy
Amount-location position circuit (5), the energy-location position circuit (5) are connected to encoding coordinate route marker (6), the volume
Code coordinate transformation device (6) is connected to code value output circuit (7).
2. projected light keyboard according to claim 1, it is characterised in that: the light frequency synthesizer (2) uses hard
Matter crystal excites thin slice, and the hard crystal excitation thin slice rear end drives the excitation of hard crystal by frequency excitation curing circuit
Thin slice generates fixed frequency wave signal.
3. projected light keyboard according to claim 1, it is characterised in that: the optical frequency reflective condition captures circuit (4)
Using quartz-crystal needle parallel construction, each reflection capture point passes through front end in optical frequency reflective condition capture circuit (4)
Quartz-crystal needle cluster carry out frequency signal wave acquisition.
4. projected light keyboard according to claim 1, it is characterised in that: the energy-location position circuit (5) passes through
Frequency energy trigger signal chooses light keyboard code value triggering state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710603706.0A CN109284031A (en) | 2017-07-23 | 2017-07-23 | Projected light keyboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710603706.0A CN109284031A (en) | 2017-07-23 | 2017-07-23 | Projected light keyboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109284031A true CN109284031A (en) | 2019-01-29 |
Family
ID=65185952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710603706.0A Pending CN109284031A (en) | 2017-07-23 | 2017-07-23 | Projected light keyboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109284031A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858677A (en) * | 2006-05-23 | 2006-11-08 | 郭超逸 | Photoelectric keyboard |
| CN102591464A (en) * | 2012-01-13 | 2012-07-18 | 吴岳忠 | Laser virtual keyboard |
| CN103092357A (en) * | 2013-01-11 | 2013-05-08 | 深圳市宇恒互动科技开发有限公司 | Implementation method of scanning and locating and projected keyboard device |
-
2017
- 2017-07-23 CN CN201710603706.0A patent/CN109284031A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858677A (en) * | 2006-05-23 | 2006-11-08 | 郭超逸 | Photoelectric keyboard |
| CN102591464A (en) * | 2012-01-13 | 2012-07-18 | 吴岳忠 | Laser virtual keyboard |
| WO2013104219A1 (en) * | 2012-01-13 | 2013-07-18 | 厦门飞沃移动通讯科技有限公司 | Laser virtual keyboard |
| CN103092357A (en) * | 2013-01-11 | 2013-05-08 | 深圳市宇恒互动科技开发有限公司 | Implementation method of scanning and locating and projected keyboard device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20190129 |