CN102385150A - Dark-focus lens - Google Patents
Dark-focus lens Download PDFInfo
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- CN102385150A CN102385150A CN2010102722339A CN201010272233A CN102385150A CN 102385150 A CN102385150 A CN 102385150A CN 2010102722339 A CN2010102722339 A CN 2010102722339A CN 201010272233 A CN201010272233 A CN 201010272233A CN 102385150 A CN102385150 A CN 102385150A
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- transparent medium
- parallel light
- lens
- transparent
- convergent lens
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Abstract
The invention relates to a dark-focus lens which mainly comprises a uniform monochromatic light source, a parallel light pipe, a lens sleeve, a transparent medium A, a transparent medium B, medium plating films, a convergent lens and an observation screen, wherein the monochromatic light source, the parallel light pipe, the lens sleeve and the observation are sequentially arranged on a base, the transparent medium A and the transparent medium B are arranged in the lens sleeve in parallel in an appressed manner, a rubber gasket and an adjusting screw can be used for tightly pressing the two transparent mediums and adjusting the positive of a gap relative to the center of the convergent lens, the convergent lens is positioned in the lens sleeve by an O-shaped rubber ring and a press ring, and the press ring and the lens sleeve are in threaded connection. Uniform monochromatic light is changed to parallel light through the parallel light pipe, half of the parallel light passes through the transparent medium A and the other half of the parallel light passes through the transparent medium B, and then the parallel light is focused on the observation screen through the convergent lens; the optical paths are different due to different thicknesses of the transparent mediums or films; and when the difference between the optical paths is odd times half wavelength, a convergent focus is a dark point.
Description
Technical field
The present invention relates to the optical focus technical field, designed a kind of device that is focused into dim spot---dark burnt mirror.
Background technology
As everyone knows, parallel rays forms a bright spot through behind the convergent lens at the lens focus place.But do not see that so far relevant parallel rays forms the report of dim spot through convergent lens.
Summary of the invention
In order to realize that directional light is converged to dim spot, the present invention has designed a kind of parallel rays through forming device---the dark burnt mirror of dim spot behind the convergent lens.
Dark burnt mirror of the present invention, mainly by even monochromatic source, parallel light tube, transparent medium A, transparent medium B, comprise that plating deielectric-coating, mirror cover, convergent lens and film viewing screen form.Evenly monochromatic source, parallel light tube, mirror cover and film viewing screen are arranged in order and are installed on the base, and the refractive index of transparent medium A and transparent medium B is identical and thickness is different, and both are close to side by side; Be installed in the mirror cover; The rubber blanket of a side pad one fast 5 millimeters thick good springiness of transparent medium A, the side of transparent medium B has set screw to compress, and set screw is installed in mirror and puts; Convergent lens is positioned in the mirror cover by O type rubber ring and pressure ring, and pressure ring and mirror cover are by being threaded.Evenly monochromatic light becomes directional light behind parallel light tube, the half the transparent medium A that passes through of this monochromatic collimated beam, and second half focuses on the film viewing screen through convergent lens through behind the transparent medium B, and film viewing screen is positioned at the lens focus place.The rubber blanket of 5 millimeters thick good springiness and set screw can be regulated the slit of two transparent medium A, B and aimed at the convergent lens center, so that the light quantity through two transparent medium A, B is equated.If the refractive index of transparent medium A and B is n, its thickness difference is e, and the wavelength of monochromatic collimated beam is b, is a through transparent medium A and B and the optical path difference through arrival along behind the convergent lens respectively then
a＝(n-1)e
According to the fluctuation principle: when a=(n-1) e=(2k+1) b/2, along should be dim spot.For different wavelengths b and refractive index n, the thickness difference e of transparent medium A and B is corresponding different.
Benefit of the present invention is can make the student not only be focused into bright spot from convergent lens to go to understand the theory that convergent lens can not produce the additional optical path difference, can also go to understand from opposite angles.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 is dark burnt mirror optical principle synoptic diagram.
Fig. 2 is first dark burnt mirror embodiment device synoptic diagram.
Fig. 3 is second dark burnt mirror embodiment 2 device synoptic diagram.
Among the figure, 1, the monochromatic collimated beam line, 2, the outshot of the relative B of transparent medium A, 3, transparent medium A, 4, transparent medium B, 5, convergent lens; 6, converging ray, 7, focus, 8, film viewing screen, 9, monochromatic source, 10, parallel light tube; 11, base, 12, the mirror cover, 13, set screw, 14, rubber blanket, 15, O type rubber ring; 16, pressure ring is regulated mouthful, and 17, pressure ring, 18, the plated film of transparent medium B, 19, the plated film of transparent medium A, 20, the outshot of the relative B of transparent medium A plated film.
Specific embodiments
In Fig. 2; Monochromatic source (9), parallel light tube (10), mirror cover (12), film viewing screen (8) are installed on the base (11) successively; Transparent medium A (3) and transparent medium B (4) are close to and are installed in side by side in the mirror cover (12), and the side of transparent medium A (3) is lined with the good rubber blanket of elasticity (14) of one deck 5 millimeters thick, and the side of transparent medium B (4) has set screw (13) to compress; Set screw (13) is installed on the mirror cover (12); Convergent lens (5) is positioned in the mirror cover (12) by O type rubber ring (15) and pressure ring (17), and pressure ring (17) and mirror cover (12) are by being threaded, and pressure ring is regulated mouthful (16) outwardly.
In Fig. 3, transparent medium A, B refractive index and thickness are all identical, but the thickness of the identical refractive index transparent dielectric film that is coated with is different.
Claims (2)
1. dark burnt mirror; Mainly by even monochromatic source, parallel light tube, mirror cover, transparent medium A, transparent medium B, comprise that plating deielectric-coating, convergent lens and film viewing screen form; Its principal character is that monochromatic source, parallel light tube, mirror cover and film viewing screen are arranged in order and are installed on the base; Transparent medium A and transparent medium B are close to and are installed in side by side in the mirror cover, and rubber blanket and set screw can compress two transparent mediums, and regulate the position of its centre joint with respect to the convergent lens center; Convergent lens is positioned in the mirror cover by O type rubber ring and pressure ring, and pressure ring and mirror cover are by being threaded.
2. dark burnt mirror according to claim 1 is characterized in that even monochromatic light becomes directional light behind parallel light tube, and half the through transparent medium A, second half focuses on the film viewing screen through convergent lens through behind the transparent medium B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102722339A CN102385150A (en) | 2010-09-06 | 2010-09-06 | Dark-focus lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102722339A CN102385150A (en) | 2010-09-06 | 2010-09-06 | Dark-focus lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102385150A true CN102385150A (en) | 2012-03-21 |
Family
ID=45824719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102722339A Pending CN102385150A (en) | 2010-09-06 | 2010-09-06 | Dark-focus lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102385150A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995025288A1 (en) * | 1994-03-17 | 1995-09-21 | Bifocon Optics Forschungs- Und Entwicklungsgmbh | Zoned lens |
| CN1246925A (en) * | 1996-02-09 | 2000-03-08 | 康宁股份有限公司 | Multipath interference light filter |
| CN201796179U (en) * | 2010-09-06 | 2011-04-13 | 四川大学 | Dark focus lens |
-
2010
- 2010-09-06 CN CN2010102722339A patent/CN102385150A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995025288A1 (en) * | 1994-03-17 | 1995-09-21 | Bifocon Optics Forschungs- Und Entwicklungsgmbh | Zoned lens |
| CN1246925A (en) * | 1996-02-09 | 2000-03-08 | 康宁股份有限公司 | Multipath interference light filter |
| CN201796179U (en) * | 2010-09-06 | 2011-04-13 | 四川大学 | Dark focus lens |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120321 |