JPH0522929Y2 - - Google Patents
Info
- Publication number
- JPH0522929Y2 JPH0522929Y2 JP1987058980U JP5898087U JPH0522929Y2 JP H0522929 Y2 JPH0522929 Y2 JP H0522929Y2 JP 1987058980 U JP1987058980 U JP 1987058980U JP 5898087 U JP5898087 U JP 5898087U JP H0522929 Y2 JPH0522929 Y2 JP H0522929Y2
- Authority
- JP
- Japan
- Prior art keywords
- projector
- screen
- changing means
- transmittance
- 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
- 238000002834 transmittance Methods 0.000 claims description 27
- 230000005540 biological transmission Effects 0.000 description 17
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
Landscapes
- Overhead Projectors And Projection Screens (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987058980U JPH0522929Y2 (US07655688-20100202-C00086.png) | 1987-04-17 | 1987-04-17 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987058980U JPH0522929Y2 (US07655688-20100202-C00086.png) | 1987-04-17 | 1987-04-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63165638U JPS63165638U (US07655688-20100202-C00086.png) | 1988-10-28 |
JPH0522929Y2 true JPH0522929Y2 (US07655688-20100202-C00086.png) | 1993-06-11 |
Family
ID=30890048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1987058980U Expired - Lifetime JPH0522929Y2 (US07655688-20100202-C00086.png) | 1987-04-17 | 1987-04-17 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0522929Y2 (US07655688-20100202-C00086.png) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5532535B2 (ja) * | 2006-08-28 | 2014-06-25 | セイコーエプソン株式会社 | プロジェクタ |
-
1987
- 1987-04-17 JP JP1987058980U patent/JPH0522929Y2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS63165638U (US07655688-20100202-C00086.png) | 1988-10-28 |
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