JPS6041943U - overhead projector - Google Patents
overhead projectorInfo
- Publication number
- JPS6041943U JPS6041943U JP13187983U JP13187983U JPS6041943U JP S6041943 U JPS6041943 U JP S6041943U JP 13187983 U JP13187983 U JP 13187983U JP 13187983 U JP13187983 U JP 13187983U JP S6041943 U JPS6041943 U JP S6041943U
- Authority
- JP
- Japan
- Prior art keywords
- adjustment device
- focus adjustment
- overhead projector
- automatic focus
- light
- 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.)
- Granted
Links
Landscapes
- Overhead Projectors And Projection Screens (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は本考案によるオーバーヘッドプロジェクタ−の
一実施例の一部破断側面図、第２図及び第３図は夫々上
記実施例のヘッドまわりの一部破断側面図及び一部破断
背面図、第４図は上記実施例の自動焦点調節装置の原理
を示す説明図、第５図は上記実施例の距離計カムの摺動
ピンの位置と受光素子の位置との間係を示す図、第６図
は上記実施例の制御回路を示す図である。
１・・・プロジェクタ一本体、２・・・光源、３・・・
フレネルレンズ、４・・・載置台、５・・・受は台、６
・・・支柱、７・・・回転板、８・・・ガイド支柱、９
・・・ヘッド、１０・・・投影レンズ、１１・・・反射
鏡、１２・・・モータ、１３・・・中介ギヤ、１４・・
・軸受部、１５・・・投光部、１６・・・受光部、１７
・・・レバー、１８・・・距離計カム、１９・・・摺動
ピン、２０・・・スクリーン、２１．２２・・・交流増
幅器、２３・・・差動増幅器、２４・・・発振器、２５
・・・自動焦点調節装置、２６・・・減光回路、２７・
・・リレー、ＳＷｌ・・・切換スイッチ、ＳＷ２・・・
スイッチ、ＳＷｏ・・・電源スィッチ。
「−′ロ
ー銭蟲＝←〒−封呂
第４図 −−−
＼
２３ ７ノ
第２− 干 。
還２４FIG. 1 is a partially cutaway side view of an embodiment of an overhead projector according to the present invention, FIGS. Fig. 4 is an explanatory diagram showing the principle of the automatic focus adjustment device of the above embodiment, Fig. 5 is a diagram showing the relationship between the position of the sliding pin of the rangefinder cam and the position of the light receiving element of the above embodiment, and Fig. 6 The figure is a diagram showing the control circuit of the above embodiment. 1... Projector body, 2... Light source, 3...
Fresnel lens, 4... mounting stand, 5... support stand, 6
... Support column, 7 ... Rotating plate, 8 ... Guide support column, 9
... Head, 10... Projection lens, 11... Reflector, 12... Motor, 13... Intermediate gear, 14...
・Bearing part, 15... Light projecting part, 16... Light receiving part, 17
... lever, 18 ... distance meter cam, 19 ... sliding pin, 20 ... screen, 21.22 ... AC amplifier, 23 ... differential amplifier, 24 ... oscillator, 25
... automatic focus adjustment device, 26 ... dimming circuit, 27.
...Relay, SWl...Choice switch, SW2...
Switch, SWo...Power switch. ``-'Rozenmushi=←〒-Furo 4th figure --- \23 7th No. 2-Kan. Kan 24
Claims (1)
クリーンまでの距離を自動的に測定して投影画像の焦点
調節を自動的に行う自動焦点調節装置を具備したオーバ
ーヘッドプロジェクタ−において、切換スイッチにより
光源を減光状態又は全光状態にする減光回路と、作動状
態の切換えにより前記切換えスイッチを減光側にすると
同時に自動焦点調節装置をＯＮにし或は前記切換スイッ
チを全光側にすると同時に自動焦点調節装置をＯＦＦに
するリレーとを設けたことを特徴とするオーバーヘッド
プロジェクタ−０In an overhead projector equipped with an automatic focus adjustment device that automatically measures the distance from the head to the screen using a distance measuring mechanism consisting of a light emitter and a light receiver and automatically adjusts the focus of the projected image, a selector switch is used. a dimming circuit which puts a light source in a dimming state or a full light state; and when the changeover switch is set to the dimming side by switching the operating state and at the same time an automatic focus adjustment device is turned on or the changeover switch is set to the full light side. Overhead projector-0 characterized by being provided with a relay that simultaneously turns off an automatic focus adjustment device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13187983U JPS6041943U (en) | 1983-08-26 | 1983-08-26 | overhead projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13187983U JPS6041943U (en) | 1983-08-26 | 1983-08-26 | overhead projector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6041943U true JPS6041943U (en) | 1985-03-25 |
| JPH0210520Y2 JPH0210520Y2 (en) | 1990-03-15 |
Family
ID=30298007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13187983U Granted JPS6041943U (en) | 1983-08-26 | 1983-08-26 | overhead projector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6041943U (en) |
-
1983
- 1983-08-26 JP JP13187983U patent/JPS6041943U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0210520Y2 (en) | 1990-03-15 |
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