JPH0337434U - - Google Patents
Info
- Publication number
- JPH0337434U JPH0337434U JP9668089U JP9668089U JPH0337434U JP H0337434 U JPH0337434 U JP H0337434U JP 9668089 U JP9668089 U JP 9668089U JP 9668089 U JP9668089 U JP 9668089U JP H0337434 U JPH0337434 U JP H0337434U
- Authority
- JP
- Japan
- Prior art keywords
- projection
- lens
- optical unit
- focal length
- circuit
- 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 description 7
- 238000005259 measurement Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Focusing (AREA)
- Overhead Projectors And Projection Screens (AREA)
Description
第１図は本考案の一実施例に係る自動焦点オー
バーヘツドプロジエクタの回路構成を示すブロツ
ク図、第２図は投影距離測定の原理図、第３図は
レンズと投影用光源面の位置関係図、第４図は外
観図である。
１……投影距離測定回路、２……焦点距離演算
回路、３……光学ユニツト駆動回路、４……光学
ユニツト駆動モータ、５……レンズ位置検出回路
、６……光学ユニツト、７……電源、８……投影
用光源、９……投影面、１０……発光素子、１１
……受光素子、１２……レンズ、１３……操作パ
ネル、１４……投影用光源面、Ｘ……投影距離。
Figure 1 is a block diagram showing the circuit configuration of an autofocus overhead projector according to an embodiment of the present invention, Figure 2 is a principle diagram of projection distance measurement, and Figure 3 is the positional relationship between the lens and the projection light source surface. 4 are external views. DESCRIPTION OF SYMBOLS 1... Projection distance measurement circuit, 2... Focal length calculation circuit, 3... Optical unit drive circuit, 4... Optical unit drive motor, 5... Lens position detection circuit, 6... Optical unit, 7... Power supply , 8... Light source for projection, 9... Projection surface, 10... Light emitting element, 11
... Light receiving element, 12 ... Lens, 13 ... Operation panel, 14 ... Light source surface for projection, X ... Projection distance.
Claims (1)
子及び受光素子を有し、発光素子より出力され投
影面で反射された光線を受光素子にて受光した時
の受光像の幅により投影距離を求める投影距離測
定回路、該投影距離測定回路によつて求めた投影
距離に対応するレンズの焦点距離を求め、レンズ
の現在位置と比較してレンズを含む光学ユニツト
の移動方向と距離のデータを出力する焦点距離演
算回路、該焦点距離演算回路から出力された上記
データに基づいて上記光学ユニツトをレンズごと
移動させ、投影用光源面との距離を調整すること
により投影面に焦点を合わせる光学ユニツト駆動
回路、及びレンズの現在位置を常時監視、検出し
、該位置データを上記焦点距離演算回路に対し入
力する光学ユニツト駆動手段を備えたことを特徴
としたオーバーヘツドプロジエクタ。 In an overhead projector, a projection distance measuring circuit having a light emitting element and a light receiving element, and determining a projection distance based on the width of a received light image when a light beam outputted from the light emitting element and reflected on a projection surface is received by the light receiving element; a focal length calculation circuit that calculates the focal length of the lens corresponding to the projection distance calculated by the projection distance measurement circuit, compares it with the current position of the lens, and outputs data on the moving direction and distance of the optical unit including the lens; An optical unit drive circuit that moves the optical unit together with the lens based on the data output from the focal length calculation circuit and adjusts the distance to the projection light source surface to focus on the projection plane, and the current state of the lens. 1. An overhead projector comprising an optical unit driving means that constantly monitors and detects the position and inputs the position data to the focal length calculation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9668089U JPH0337434U (en) | 1989-08-21 | 1989-08-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9668089U JPH0337434U (en) | 1989-08-21 | 1989-08-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0337434U true JPH0337434U (en) | 1991-04-11 |
Family
ID=31645868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9668089U Pending JPH0337434U (en) | 1989-08-21 | 1989-08-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0337434U (en) |
-
1989
- 1989-08-21 JP JP9668089U patent/JPH0337434U/ja active Pending
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