JPS61148044U - - Google Patents
Info
- Publication number
- JPS61148044U JPS61148044U JP3125285U JP3125285U JPS61148044U JP S61148044 U JPS61148044 U JP S61148044U JP 3125285 U JP3125285 U JP 3125285U JP 3125285 U JP3125285 U JP 3125285U JP S61148044 U JPS61148044 U JP S61148044U
- Authority
- JP
- Japan
- Prior art keywords
- projector
- projection
- projection lens
- lens
- focal length
- 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
- 230000003287 optical effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Overhead Projectors And Projection Screens (AREA)
- Lens Barrels (AREA)
Description
第１図は本案の実施例を説明する説明図、第２
図及び第３図は本案による投影レンズ鏡胴部の断
面図、第４図は投影レンズの内側鏡胴の構造を示
す斜視図、第５図は、本案の光源集光系を説明す
る概念図である。
１：回転鏡胴、２：固定鏡胴、４：ヘリコイド
溝、６：ワイヤー、７，８，９：プーリ、１０：
ステージホルダー、１１：ステージ、１２：可動
鏡胴、１４：光源、１５：フレネルレンズ、Ｌ１
：固定レンズ、Ｌ２：可動レンズ。
Figure 1 is an explanatory diagram explaining an embodiment of the present invention, Figure 2
3 and 3 are cross-sectional views of the projection lens barrel according to the present invention, FIG. 4 is a perspective view showing the structure of the inner barrel of the projection lens, and FIG. 5 is a conceptual diagram illustrating the light source condensing system of the present invention. It is. 1: Rotating lens barrel, 2: Fixed lens barrel, 4: Helicoid groove, 6: Wire, 7, 8, 9: Pulley, 10:
Stage holder, 11: Stage, 12: Movable lens barrel, 14: Light source, 15: Fresnel lens, L 1
: Fixed lens, L 2 : Movable lens.
Claims (1)
として有し、かつ被投影物が載置されるスガージ
が光軸に沿つて昇降自在に構成されたオーバーヘ
ツドプロジエクタにおいて、前記ステージの昇降
運動に応動して、前記投影用レンズの焦点距離を
連続的に可変とする連動手段を設けることにより
、連続的な拡大率での部分拡大投影を得ることを
特徴とするズーム式部分拡大投影可能なオーバー
ヘツドプロジエクタ。 In an overhead projector having a variable focal length lens for a finite distance as a projection lens, and in which a sgarge on which an object to be projected is placed is configured to be movable up and down along the optical axis, the projector responds to the up and down movement of the stage. An overhead device capable of zoom-type partially enlarged projection, characterized in that the projection lens is provided with interlocking means for continuously varying the focal length of the projection lens, thereby obtaining partially enlarged projection at a continuous magnification ratio. projector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3125285U JPS61148044U (en) | 1985-03-05 | 1985-03-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3125285U JPS61148044U (en) | 1985-03-05 | 1985-03-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61148044U true JPS61148044U (en) | 1986-09-12 |
Family
ID=30531690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3125285U Pending JPS61148044U (en) | 1985-03-05 | 1985-03-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61148044U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4854928A (en) * | 1971-11-08 | 1973-08-02 | ||
| JPS49121529A (en) * | 1973-03-02 | 1974-11-20 | ||
| JPS50133832A (en) * | 1974-04-09 | 1975-10-23 |
-
1985
- 1985-03-05 JP JP3125285U patent/JPS61148044U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4854928A (en) * | 1971-11-08 | 1973-08-02 | ||
| JPS49121529A (en) * | 1973-03-02 | 1974-11-20 | ||
| JPS50133832A (en) * | 1974-04-09 | 1975-10-23 |