Electronic sight and manufacturing method thereof
The electronic sight includes a base, an optical window, a point light source, a photomask and a low-reflective layer. The optical window is disposed on a first end of the base. The point light source, disposed on a second end of the base, provides a lightbeam. The photomask is disposed between the point light source and the optical window, and the low-reflective layer is formed thereon. The lightbeam passes through the photomask along a first direction, hits the optical window, and is reflected toward a second direction by the optical window. The method for manufacturing the electronic sight includes: providing a base; providing an optical window disposed on a first end of the base; providing a point light source disposed on a second end of the base; providing a photomask; forming a low-reflective layer on the photomask; and positioning the photomask between the point light source and the optical window.
1. An electronic sight, comprising:
a base having a first end and a second end;
an optical window disposed on the first end of the base;
a point light source, disposed on the second end of the base, providing a lightbeam;
a photomask disposed between the point light source and the optical window, wherein the photomask comprises an aperture, and the lightbeam passes through the aperture and then hits the optical window; and
a low-reflective layer formed on the photomask to block metallic reflections from the photomask, wherein the low-reflective layer comprises Fe—Ni—Cr or SiO 2 ;
wherein the lightbeam passes through the photomask along a first direction, hits the optical window, and is reflected toward a second direction by the optical window.
2. The electronic sight as claimed in claim 1 , wherein the photomask is formed by electroforming.
3. The electronic sight as claimed in claim 1 , wherein the low-reflective layer is formed on the photomask by thermal evaporation.
4. The electronic sight as claimed in claim 1 , wherein the low-reflective layer has a reflectance under 45%.
5. The electronic sight as claimed in claim 1 , wherein the point light source is a light emitting diode.
6. The electronic sight as claimed in claim 1 , wherein the optical window comprises a reflective layer.
7. The electronic sight as claimed in claim 1 , wherein the photomask is a thin plate.
8. A method for manufacturing an electronic sight, comprising:
providing a base having a first end and a second end;
providing an optical window disposed on the first end of the base;
providing a point light source disposed on the second end of the base, wherein the point light source provides a lightbeam;
providing a photomask, wherein the photomask comprises an aperture, and the lightbeam passes through the aperture and then hits the optical window;
forming a low-reflective layer on the photomask to block metallic reflections from the photomask, wherein the low-reflective layer is formed on the photomask by thermal evaporation; and
positioning the photomask between the point light source and the optical window.
9. The method for manufacturing the electronic sight as claimed in claim 8 , wherein the low-reflective layer comprises Fe—Ni—Cr or SiO 2 .
10. The method for manufacturing the electronic sight as claimed in claim 8 , wherein the low-reflective layer has a reflectance under 45%.
11. The method for manufacturing the electronic sight as claimed in claim 8 , wherein the point light source is a light emitting diode.
12. The method for manufacturing the electronic sight as claimed in claim 8 , wherein the optical window comprises a reflective layer.
13. The method for manufacturing the electronic sight as claimed in claim 8 , further comprising forming a photomask group, wherein the photomask group comprises a plurality of photomasks.
14. The method for manufacturing the electronic sight as claimed in claim 8 , wherein the photomask is electroformed of Ni.