JPH0521070Y2 - - Google Patents
Info
- Publication number
- JPH0521070Y2 JPH0521070Y2 JP1987114695U JP11469587U JPH0521070Y2 JP H0521070 Y2 JPH0521070 Y2 JP H0521070Y2 JP 1987114695 U JP1987114695 U JP 1987114695U JP 11469587 U JP11469587 U JP 11469587U JP H0521070 Y2 JPH0521070 Y2 JP H0521070Y2
- Authority
- JP
- Japan
- Prior art keywords
- center
- illumination lamp
- screen
- imaging lens
- fresnel lens
- 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 - Lifetime
Links
- 238000005286 illumination Methods 0.000 claims description 16
- 238000003384 imaging method Methods 0.000 claims description 16
- 230000003287 optical effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Overhead Projectors And Projection Screens (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987114695U JPH0521070Y2 (it) | 1987-07-27 | 1987-07-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987114695U JPH0521070Y2 (it) | 1987-07-27 | 1987-07-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6419942U JPS6419942U (it) | 1989-01-31 |
| JPH0521070Y2 true JPH0521070Y2 (it) | 1993-05-31 |
Family
ID=31355678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987114695U Expired - Lifetime JPH0521070Y2 (it) | 1987-07-27 | 1987-07-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0521070Y2 (it) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59173051U (ja) * | 1983-05-02 | 1984-11-19 | 株式会社リコー | 反射型オ−バヘツドプロジエクタ |
-
1987
- 1987-07-27 JP JP1987114695U patent/JPH0521070Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6419942U (it) | 1989-01-31 |
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