JPS62201738U - - Google Patents

Info

Publication number
JPS62201738U
JPS62201738U JP9028686U JP9028686U JPS62201738U JP S62201738 U JPS62201738 U JP S62201738U JP 9028686 U JP9028686 U JP 9028686U JP 9028686 U JP9028686 U JP 9028686U JP S62201738 U JPS62201738 U JP S62201738U
Authority
JP
Japan
Prior art keywords
screen
optical system
detection sensor
projector device
overhead projector
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
Application number
JP9028686U
Other languages
Japanese (ja)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP9028686U priority Critical patent/JPS62201738U/ja
Publication of JPS62201738U publication Critical patent/JPS62201738U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Focusing (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案によるオーバーヘツドプロジエ
クター装置の構造を示す説明図であり、第２図は
従来のオーバーヘツドプロジエクター装置の構造
を示す説明図である。 符号の説明、１２……光源ランプ、１４……投
影レンズ、１５……反射鏡、１６……スクリーン
、１７……移動手段、１８……駆動回路、１９…
…超音波発信器、２０……制御部。 FIG. 1 is an explanatory diagram showing the structure of an overhead projector device according to the present invention, and FIG. 2 is an explanatory diagram showing the structure of a conventional overhead projector device. Explanation of symbols, 12... Light source lamp, 14... Projection lens, 15... Reflector, 16... Screen, 17... Moving means, 18... Drive circuit, 19...
...Ultrasonic transmitter, 20...Control unit.

Claims (1)

【実用新案登録請求の範囲】 (1) 所定位置に載置された原稿を照明する光源
と、前記原稿の原画を拡大する光学系と、前記光
学系を通過した光をスクリーン上に反射させる反
射鏡とを備えるオーバーヘツドプロジエクター装
置において、 前記光学系の位置を変位させる移動手段と、前
記オーバーヘツドプロジエクター装置及び前記ス
クリーンとの距離を検出する検出センサと、前記
検出センサからの情報信号を受け、所定の演算後
、前記移動手段に対して制御信号を出力し、光学
系に対し自動的に焦点制御を行う制御手段を備え
たことを特徴とするオーバーヘツドプロジエクタ
ー装置。 (2) 前記検出センサが超音波を出力し、スクリ
ーンに反射されて戻つてくるまでの時間に基づい
て距離を検出することを特徴とする前記実用新案
登録請求の範囲第１項記載のオーバーヘツドプロ
ジエクター装置。 (3) 前記検出センサが複数の受光素子から構成
されており、前記スクリーンから反射されて受光
された光の濃淡のレベル差に基づいて距離を検出
することを特徴とする前記実用新案登録請求の範
囲第１項記載のオーバーヘツドプロジエクター装
置。[Claims for Utility Model Registration] (1) A light source that illuminates a document placed in a predetermined position, an optical system that magnifies the original image of the document, and a reflection that reflects the light that has passed through the optical system onto a screen. an overhead projector device comprising: a moving means for displacing the position of the optical system; a detection sensor for detecting a distance between the overhead projector device and the screen; and an information signal from the detection sensor. 1. An overhead projector apparatus comprising: a control means that outputs a control signal to the moving means after receiving and performing a predetermined calculation, and automatically performs focus control on the optical system. (2) The overhead device according to claim 1, wherein the detection sensor outputs an ultrasonic wave and detects the distance based on the time it takes for the ultrasonic wave to be reflected on a screen and returned. projector device. (3) The utility model registration request is characterized in that the detection sensor is composed of a plurality of light-receiving elements, and detects the distance based on a difference in the level of density of light reflected from the screen and received. An overhead projector device according to claim 1.
JP9028686U 1986-06-13 1986-06-13 Pending JPS62201738U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9028686U JPS62201738U (en) 1986-06-13 1986-06-13

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9028686U JPS62201738U (en) 1986-06-13 1986-06-13

Publications (1)

Publication Number Publication Date
JPS62201738U true JPS62201738U (en) 1987-12-23

Family

ID=30950005

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9028686U Pending JPS62201738U (en) 1986-06-13 1986-06-13

Country Status (1)

Country Link
JP (1) JPS62201738U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0290135A (en) * 1988-09-28 1990-03-29 Topcon Corp Automatic focusing projector
KR100480023B1 (en) * 1997-12-30 2005-07-11 엘지전자 주식회사 Auto Focusing Device of Head Projector

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5012304A (en) * 1973-04-24 1975-02-07
JPS5033653A (en) * 1973-07-31 1975-03-31
JPS5461525A (en) * 1977-10-03 1979-05-17 Polaroid Corp Variable focus lens unit and camera

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5012304A (en) * 1973-04-24 1975-02-07
JPS5033653A (en) * 1973-07-31 1975-03-31
JPS5461525A (en) * 1977-10-03 1979-05-17 Polaroid Corp Variable focus lens unit and camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0290135A (en) * 1988-09-28 1990-03-29 Topcon Corp Automatic focusing projector
KR100480023B1 (en) * 1997-12-30 2005-07-11 엘지전자 주식회사 Auto Focusing Device of Head Projector

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