JPS6312704U - - Google Patents
Info
- Publication number
- JPS6312704U JPS6312704U JP10221886U JP10221886U JPS6312704U JP S6312704 U JPS6312704 U JP S6312704U JP 10221886 U JP10221886 U JP 10221886U JP 10221886 U JP10221886 U JP 10221886U JP S6312704 U JPS6312704 U JP S6312704U
- Authority
- JP
- Japan
- Prior art keywords
- light
- receiving element
- receiving
- projected image
- detection device
- 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
- 238000003708 edge detection Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Instruments For Measurement Of Length By Optical Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
Description
第１図は本考案に係る投影画像のエツジ検出装
置を適用すべき投影機を示す正面図、第２図は本
考案に係る投影画像のエツジ検出装置の実施例を
示す第１図の―線に沿う拡大断面図、第３図
は従来のエツジ検出装置を示すブロツク図、第４
図は同従来のエツジ検出装置の要部を拡大して示
す断面図、第５図は同従来のエツジ検出装置にお
ける出力信号及びエツジパルスとの関係を示す線
図、第６図は同従来のエツジ検出装置における、
外乱光がある場合の出力信号及びエツジパルスと
の関係を示す線図である。
１０……スクリーン、１２……受光器、１４…
…エツジ信号発生器、１６……受光筒、１６Ａ…
…開口部、Ｄ……直径、Ｗ……距離、１８，２０
……受光素子、１８Ａ，２０Ａ……受光面、３０
Ａ……投影画像。
FIG. 1 is a front view showing a projector to which a projection image edge detection device according to the present invention is applied, and FIG. 2 is a line taken along the line “-” in FIG. 1 showing an embodiment of the projection image edge detection device according to the present invention. FIG. 3 is a block diagram showing a conventional edge detection device; FIG.
The figure is an enlarged cross-sectional view of the main parts of the conventional edge detection device, FIG. 5 is a diagram showing the relationship between the output signal and edge pulse in the conventional edge detection device, and FIG. In the detection device,
FIG. 7 is a diagram showing the relationship between an output signal and an edge pulse when there is disturbance light. 10... Screen, 12... Light receiver, 14...
...Edge signal generator, 16...Photodetector tube, 16A...
...Opening, D...Diameter, W...Distance, 18,20
... Light receiving element, 18A, 20A ... Light receiving surface, 30
A...Projected image.
Claims (1)
に向けて配置され受光量に応じた電気信号を出力
する少なくとも１個の受光素子を備えた受光器と
、この受光素子の出力信号を処理して、前記投影
画像のエツジが該受光器の前面を横切るときにエ
ツジ信号を出力するエツジ信号発生器と、を有し
てなる投影画像のエツジ検出装置において、前記
受光素子を、前記スクリーンに向かつて形成され
た開口部を備えた受光筒内に配置し、且つ、該受
光素子の受光面と前記スクリーンとの距離が、前
記開口部と等面積の円の直径以上となるように該
受光素子を配置したことを特徴とする投影画像の
エツジ検出装置。 (2) 前記開口部は、前記受光素子の受光面と略
等しい形状とされた実用新案登録請求の範囲第１
項記載の投影画像のエツジ検出装置。 (3) 前記受光器は、受光面が同心円状の２個の
受光素子からなり、前記開口部は、前記同心円状
の外側の受光素子の外径と略等しい円形とされた
実用新案登録請求の範囲第２項記載の投影画像の
エツジ検出装置。[Claims for Utility Model Registration] (1) A light receiver having a light receiving surface facing a screen on which a projected image is formed and having at least one light receiving element that outputs an electrical signal according to the amount of received light; an edge signal generator for processing the output signal of the light receiving element and outputting an edge signal when the edge of the projected image crosses the front surface of the light receiver; The light-receiving element is arranged in a light-receiving tube having an opening formed toward the screen, and the distance between the light-receiving surface of the light-receiving element and the screen is a circle having the same area as the opening. 1. An edge detection device for a projected image, characterized in that the light-receiving elements are arranged so as to be larger than the diameter of the light-receiving element. (2) The opening has a shape substantially equal to the light-receiving surface of the light-receiving element.
An edge detection device for a projected image as described in 2. (3) The light receiver is composed of two light-receiving elements each having a concentric light-receiving surface, and the aperture is circular in shape and approximately equal in outer diameter to the outer diameter of the outer light-receiving element of the concentric circles. An edge detection device for a projected image according to scope 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10221886U JPH0412407Y2 (en) | 1986-07-03 | 1986-07-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10221886U JPH0412407Y2 (en) | 1986-07-03 | 1986-07-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6312704U true JPS6312704U (en) | 1988-01-27 |
| JPH0412407Y2 JPH0412407Y2 (en) | 1992-03-25 |
Family
ID=30973667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10221886U Expired JPH0412407Y2 (en) | 1986-07-03 | 1986-07-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0412407Y2 (en) |
-
1986
- 1986-07-03 JP JP10221886U patent/JPH0412407Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0412407Y2 (en) | 1992-03-25 |
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