CN2406269Y - Light-blocking teaching projection film - Google Patents
Light-blocking teaching projection film Download PDFInfo
- Publication number
- CN2406269Y CN2406269Y CN 99254825 CN99254825U CN2406269Y CN 2406269 Y CN2406269 Y CN 2406269Y CN 99254825 CN99254825 CN 99254825 CN 99254825 U CN99254825 U CN 99254825U CN 2406269 Y CN2406269 Y CN 2406269Y
- Authority
- CN
- China
- Prior art keywords
- light
- teaching
- egative film
- blocking
- blocking layer
- 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
Links
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 230000000903 blocking effect Effects 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 239000000549 coloured material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
The utility model belongs to an electrochemical teaching aid. A light-blocking type projection film for teaching is made up of a transparent film with smooth both surfaces, and features that a light-blocking layer is attached to one surface of said transparent film and is made up of opaque liquid through spraying.
Description
The utility model belongs to a kind of electronic teaching apparatus.
Along with popularizing of electronic teaching, the use of projector more and more widely is used for writing the also consumption surge of autochrome of printing the content of courses.Existing autochrome all is a light-transmission type on the market, as very thin transparent plastic film, glass plate etc., its using method is with coloured material that is in the light on this egative film, write literal or the figure of producing needs as ink, pigment etc., when the light that penetrates when projector is inner passes egative film and projects in the screen, it is darker relatively that literal that these are in the light or pattern just seem, sleazy blank space is then brighter, and this contrast makes the student can see the content of the making of writing clearly.But the transparency that makes with this light-transmission type egative film has its weak point when teaching, if projector interior lamp luminance brightness is not enough, then the contrast of institute's content of writing and blank parts is not obvious, as cloudy, seems that sharpness is not enough; But if light is stronger, then the background that forms of blank space is too bright, just as seeing thing under bright daylight, though know and seem that some is dazzling, damages student's eyes easily.
The purpose of this utility model just provides a kind of novel teaching autochrome, and after the light-illuminating projection by projector inside, the writing of the making of writing or figure had both seemed clear and seemed not too dazzling on the egative film.
A kind of light-keeping-off type teaching autochrome that makes by the smooth light-transmission type egative film 1 in two sides, the one side that it is characterized in that said light-transmission type egative film is with light blocking layer 2, and this light blocking layer is formed by opaque liquid spray.
Description of drawings: Fig. 1 is the making and use precedence diagram of light-keeping-off type teaching autochrome, wherein, 1-light-transmission type egative film, 2-light blocking layer, 3-coating are wiped off literal and the figure that the back forms.
Embodiment 1: the plastic film two sides is smooth, good transmittance makes the light-transmission type egative film 1 supporting with projector, the blackwash that to mix glue then is sprayed on its one side equably, form light blocking layer 2, the thickness of coating is wanted suitably, should be light tight, can not tie plate again, treat the coating airing after, just made light-keeping-off type teaching autochrome.In use, write or draw according to the content of teaching needs on light blocking layer with stylus, the coating that is sprayed on corresponding site on the light-transmission type egative film is wiped off thereupon, forms the literal and the figure 3 of printing opacity, under situation with good conditionsi, this process also available machines used is finished.Write make finish after, be put into and open light source on the projector, because light blocking layer has blocked light, the position energy transmitted light that has only coating to be wiped off, remainder is lighttight, so throw in the screen, just demonstrates the literal and the figure of white in the background of black.Because be display white literal and figure under black background, just clear as the light lattice place in night, and the stroke of literal and figure is all thinner, so the light that sees through is not dazzling.
Embodiment 2: the employing glass plate is a raw material, makes light-transmission type egative film 1, and all the other making and use methods are identical with embodiment 1.This scheme is compared with embodiment 1, and effect is approaching, and the former price is high slightly, but safety is light, is easy to preserve; Latter's low price is convenient to self-control, but heavy frangible dangerous.
The utility model is compared with existing light-transmission type egative film, at display text With the simple graph aspect, projection is more clear, more is conducive to protect the student to look Power.
Claims (1)
1, a kind of light-keeping-off type teaching egative film that makes by the smooth light-transmission type egative film 1 in two sides, the one side that it is characterized in that said light-transmission type egative film is with light blocking layer 2, and this light blocking layer is formed by opaque liquid spray.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99254825 CN2406269Y (en) | 1999-11-28 | 1999-11-28 | Light-blocking teaching projection film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99254825 CN2406269Y (en) | 1999-11-28 | 1999-11-28 | Light-blocking teaching projection film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2406269Y true CN2406269Y (en) | 2000-11-15 |
Family
ID=34038341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99254825 Expired - Fee Related CN2406269Y (en) | 1999-11-28 | 1999-11-28 | Light-blocking teaching projection film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2406269Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115046172A (en) * | 2022-06-27 | 2022-09-13 | 北京一数科技有限公司 | Projection negative, manufacturing method of projection negative and projection lamp |
-
1999
- 1999-11-28 CN CN 99254825 patent/CN2406269Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115046172A (en) * | 2022-06-27 | 2022-09-13 | 北京一数科技有限公司 | Projection negative, manufacturing method of projection negative and projection lamp |
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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 |