JPH01177701U - - Google Patents
Info
- Publication number
- JPH01177701U JPH01177701U JP7576288U JP7576288U JPH01177701U JP H01177701 U JPH01177701 U JP H01177701U JP 7576288 U JP7576288 U JP 7576288U JP 7576288 U JP7576288 U JP 7576288U JP H01177701 U JPH01177701 U JP H01177701U
- Authority
- JP
- Japan
- Prior art keywords
- aspherical lens
- fresnel
- crushing
- thinner
- utility
- 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.)
- Pending
Links
Landscapes
- Overhead Projectors And Projection Screens (AREA)
- Lenses (AREA)
Description
第１図は、従来の球面形状フレネル型レンズの
平面図。第２図は、従来の球面形状フレネル型レ
ンズにおしつぶす前の状態正面図。第３図は、従
来の球面形状フレネル型レンズの正面図。第４図
は、フレネル型非球面レンズの平面図。第５図は
、フレネル型非球面レンズにおしつぶす前の状態
正面図。第６図は、フレネル型非球面レンズの正
面図。
１は従来の形状球面、２は非球面形状。
FIG. 1 is a plan view of a conventional spherical Fresnel lens. FIG. 2 is a front view of a conventional spherical Fresnel lens before being crushed. FIG. 3 is a front view of a conventional spherical Fresnel lens. FIG. 4 is a plan view of a Fresnel type aspherical lens. FIG. 5 is a front view of the Fresnel type aspherical lens before it is crushed. FIG. 6 is a front view of a Fresnel type aspherical lens. 1 is a conventional spherical shape, 2 is an aspherical shape.
Claims (1)
をおしつぶし厚みを薄くしたフレネル型非球面レ
ンズ。 A Fresnel-type aspherical lens is an aspherical lens that is made by cutting concentric circles from the top and crushing them to make them thinner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7576288U JPH01177701U (en) | 1988-06-07 | 1988-06-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7576288U JPH01177701U (en) | 1988-06-07 | 1988-06-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01177701U true JPH01177701U (en) | 1989-12-19 |
Family
ID=31300818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7576288U Pending JPH01177701U (en) | 1988-06-07 | 1988-06-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01177701U (en) |
-
1988
- 1988-06-07 JP JP7576288U patent/JPH01177701U/ja active Pending