CA2036932C - Folding arm for overhead projector - Google Patents
Folding arm for overhead projector Download PDFInfo
- Publication number
- CA2036932C CA2036932C CA002036932A CA2036932A CA2036932C CA 2036932 C CA2036932 C CA 2036932C CA 002036932 A CA002036932 A CA 002036932A CA 2036932 A CA2036932 A CA 2036932A CA 2036932 C CA2036932 C CA 2036932C
- Authority
- CA
- Canada
- Prior art keywords
- support arm
- housing
- state
- mounting block
- mirror
- 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 - Fee Related
Links
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000007246 mechanism Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 4
- 238000007373 indentation Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000000007 visual effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 206010017472 Fumbling Diseases 0.000 description 1
- 241001310793 Podium Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 210000000629 knee joint Anatomy 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S353/00—Optics: image projectors
- Y10S353/04—Opaque
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/486,971 US4978218A (en) | 1990-03-01 | 1990-03-01 | Folding arm for overhead projector |
| US07/486,971 | 1990-03-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2036932A1 CA2036932A1 (en) | 1991-09-02 |
| CA2036932C true CA2036932C (en) | 2001-11-27 |
Family
ID=23933866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002036932A Expired - Fee Related CA2036932C (en) | 1990-03-01 | 1991-02-22 | Folding arm for overhead projector |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4978218A (en]) |
| EP (1) | EP0444904B1 (en]) |
| JP (2) | JP2585144Y2 (en]) |
| CA (1) | CA2036932C (en]) |
| DE (2) | DE9102361U1 (en]) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5281986A (en) * | 1993-04-02 | 1994-01-25 | Minnesota Mining And Manufacturing Company | Latching mechanism for overhead projector post |
| DE9311880U1 (de) * | 1993-08-04 | 1993-10-14 | AV-Kommunikation Anders + Kern GmbH & Co KG, 22851 Norderstedt | Overhead-Projektor mit einem Variofocalobjektiv |
| JP3190187B2 (ja) * | 1993-10-19 | 2001-07-23 | 富士写真フイルム株式会社 | オーバーヘッドプロジェクター |
| US5416541A (en) * | 1994-05-16 | 1995-05-16 | Fog; Stephen C. | Folding portable overhead projector |
| DE19507847C2 (de) * | 1995-03-07 | 2003-05-22 | Kindermann & Co Gmbh | Overheadprojektor mit Projektionskopf |
| US5868484A (en) * | 1995-04-25 | 1999-02-09 | Casio Computer Co., Ltd. | Portable overhead projector |
| USD419582S (en) * | 1998-02-04 | 2000-01-25 | Sony Corporation | Collapsible overhead projector |
| US7156522B2 (en) * | 2003-07-16 | 2007-01-02 | Plut William J | Projection-type display devices with reduced weight and size |
| US7281807B2 (en) * | 2003-07-16 | 2007-10-16 | Honeywood Technologies, Llc | Positionable projection display devices |
| US20060183545A1 (en) * | 2004-11-05 | 2006-08-17 | Jourdian Robert W | Multi-user touch-responsive entertainment device |
| TWM379089U (en) * | 2009-10-15 | 2010-04-21 | Guo-Hua Chen | Actuate structure for scrolling up or down projection screen |
| CN103838066A (zh) * | 2012-11-23 | 2014-06-04 | 鸿富锦精密工业（深圳）有限公司 | 投影仪 |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2496647A (en) * | 1948-04-07 | 1950-02-07 | David O Woodbury | Portable image projector |
| US3488115A (en) * | 1967-06-15 | 1970-01-06 | Inflight Motion Pictures Inc | Overhead mounted projection system |
| US3653754A (en) * | 1969-12-29 | 1972-04-04 | Cabin Ind | Overhead projector |
| US3870411A (en) * | 1973-02-26 | 1975-03-11 | Motiva Ltd | Collapsible slide projection theatre |
| JPS5938569B2 (ja) * | 1975-12-27 | 1984-09-18 | 富士写真フイルム株式会社 | オリタタミシキカメラ |
| DE2828866A1 (de) * | 1978-06-30 | 1980-01-17 | Agfa Gevaert Ag | Fotografische klappkamera, insbesondere fuer sofortbildaufnahmen |
| CA1168485A (en) * | 1981-04-30 | 1984-06-05 | John F. Dreyer, Jr. | Portable overhead projector and carrying case |
| US4449800A (en) * | 1983-01-26 | 1984-05-22 | Buhl Industries, Inc. | Portable overhead projector |
| US4588271A (en) * | 1983-09-02 | 1986-05-13 | Fuji Photo Film Co., Ltd. | Overhead projector |
| US4636050A (en) * | 1983-12-26 | 1987-01-13 | Kabushiki Kaisha Gakushu Kenkyusha | Reflection type overhead projector |
| JPS60186432U (ja) * | 1984-05-22 | 1985-12-10 | 富士写真フイルム株式会社 | 反射式オ−バ−ヘツドプロジエクタ− |
| JPH079530B2 (ja) * | 1985-07-31 | 1995-02-01 | 株式会社リコー | オ−バ−ヘツドプロジエクタ− |
| JPH0529465Y2 (en]) * | 1985-12-25 | 1993-07-28 | ||
| US4728184A (en) * | 1987-05-26 | 1988-03-01 | Buhl Industries, Inc. | Foldable transparency enlarger for overhead projector |
| DE3915918A1 (de) * | 1988-05-16 | 1989-11-30 | Matsushita Electric Ind Co Ltd | Optisches geraet |
| JPH0743710Y2 (ja) * | 1988-05-16 | 1995-10-09 | 富士写真フイルム株式会社 | 折り畳み式光学装置 |
| DE3827059A1 (de) * | 1988-08-10 | 1990-02-15 | Geha Werke Gmbh | Klapparm fuer den projektionskopf eines arbeitsprojektors |
| JPH0247637U (en]) * | 1988-09-26 | 1990-03-30 | ||
| JPH0275634U (en]) * | 1988-11-29 | 1990-06-11 |
-
1990
- 1990-03-01 US US07/486,971 patent/US4978218A/en not_active Expired - Lifetime
-
1991
- 1991-02-22 CA CA002036932A patent/CA2036932C/en not_active Expired - Fee Related
- 1991-02-27 JP JP1991009714U patent/JP2585144Y2/ja not_active Expired - Fee Related
- 1991-02-27 JP JP1991009715U patent/JP2591867Y2/ja not_active Expired - Fee Related
- 1991-02-27 EP EP91301600A patent/EP0444904B1/en not_active Expired - Lifetime
- 1991-02-28 DE DE9102361U patent/DE9102361U1/de not_active Expired - Lifetime
- 1991-02-28 DE DE9102362U patent/DE9102362U1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE9102361U1 (de) | 1991-07-11 |
| JP2591867Y2 (ja) | 1999-03-10 |
| JPH0489938U (en]) | 1992-08-05 |
| EP0444904B1 (en) | 1995-02-08 |
| JP2585144Y2 (ja) | 1998-11-11 |
| US4978218A (en) | 1990-12-18 |
| HK1006878A1 (en) | 1999-03-19 |
| DE9102362U1 (de) | 1991-07-04 |
| CA2036932A1 (en) | 1991-09-02 |
| JPH0489939U (en]) | 1992-08-05 |
| EP0444904A3 (en) | 1991-11-21 |
| EP0444904A2 (en) | 1991-09-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |