JPH046297Y2

JPH046297Y2 -

Info

Publication number: JPH046297Y2
Application number: JP15957284U
Authority: JP
Priority date: 1984-10-22
Filing date: 1984-10-22
Publication date: 1992-02-20
Also published as: JPS6174497U

Description

【考案の詳細な説明】＜技術分野＞本考案は、原板上に画かれた平面画像を電気信
号に変換するいわゆる電子黒板に関する。[Detailed Description of the Invention] <Technical Field> The present invention relates to a so-called electronic blackboard that converts a flat image drawn on an original board into an electrical signal.

＜従来技術＞従来の電子黒板は、例えば第２図にその側面図
を示すように、原板１上の画像をスリツト１１か
ら帯状でとり出したものを、平面鏡１２で反射さ
せ、通常のカメラ用レンズ１３を用いて撮像素子
７の受光面に結像させる構造であつた。なお図に
おいて、１３は螢光灯等の光源、１４は反射板、
１５はスリツトを形成するための遮光体である。<Prior art> For example, as shown in the side view of FIG. 2, in a conventional electronic blackboard, an image on an original plate 1 is extracted from a slit 11 in the form of a band, and is reflected by a plane mirror 12. The structure was such that a lens 13 was used to form an image on the light receiving surface of the image sensor 7. In the figure, 13 is a light source such as a fluorescent lamp, 14 is a reflector,
15 is a light shield for forming a slit.

このような従来例によれば、レンズとその鏡筒
が嵩張つて装置全体の厚みが大きくなり、しか
も、レンズの光軸合わせなど鏡筒支持構造が煩雑
になりコスト高を招く欠点があつた。 According to such conventional examples, the lenses and their barrels are bulky, increasing the thickness of the entire device, and the lens barrel support structure, such as aligning the optical axis of the lenses, is complicated, leading to high costs. .

＜考案の目的＞本考案は奥行き寸法が小さい薄形で安価な電子
黒板の提供を目的とする。<Purpose of the invention> The purpose of the invention is to provide a thin and inexpensive electronic blackboard with a small depth dimension.

＜考案の構成＞本考案の電子黒板の画像読み取り装置は、その
スリツトの透過光を集光する帯状の凹面鏡と、そ
の帯状の凹面鏡の反射光を受光する線形撮像素子
を有し、原板上の二次元像を帯状に分解して電気
信号に変換することを特徴としている。<Structure of the invention> The electronic whiteboard image reading device of the invention has a strip-shaped concave mirror that collects the light transmitted through the slit, and a linear image sensor that receives the reflected light from the strip-shaped concave mirror. It is characterized by breaking down a two-dimensional image into strips and converting them into electrical signals.

＜実施例＞第１図に本考案の一実施例を示す。Ａ図は側面
図、Ｂ図は平面図である。<Example> FIG. 1 shows an example of the present invention. Figure A is a side view, and Figure B is a plan view.

原板１は可撓性フイルムで図示しない巻取装置
により例えば矢印Ａに示す所定方向へ定速度又は
間欠的に送られる。この原板１の読取装置の近傍
に螢光灯等の光源２と、その反射板３が配設さ
れ、その近傍に、遮光体４，４による微細な帯状
のスリツト４ａが形成され、そのスリツト４ａの
透過光を反射する細長い平面鏡５と、その平面鏡
５の反射光を撮像素子７へ集光させる帯状の凹面
鏡６がそれぞれ配設されている。凹面鏡６から撮
像素子７に至る光路８は原板１とほぼ平行であつ
て全体的に薄形に構成されている。撮像素子７は
例えばCCDよりなる光電気変換素子であつて受
光面の大きさは例えば幅11μｍ、長さ28mmの線形
である。従つて、この長さ28mmの中にスリツト４
ａの透光を納めるため凹面鏡６の焦点の手前又は
後方に受光面が位置するように配設される。 The original plate 1 is a flexible film that is fed, for example, at a constant speed or intermittently in a predetermined direction shown by an arrow A by a winding device (not shown). A light source 2 such as a fluorescent lamp and its reflection plate 3 are arranged near the reading device for the original plate 1, and a fine band-shaped slit 4a is formed by light shields 4, 4 in the vicinity of the light source 2, and the slit 4a An elongated plane mirror 5 that reflects the transmitted light and a strip-shaped concave mirror 6 that focuses the reflected light from the plane mirror 5 onto the image sensor 7 are provided. The optical path 8 from the concave mirror 6 to the image pickup device 7 is approximately parallel to the original plate 1 and has a thin overall configuration. The image pickup device 7 is a photoelectric conversion device made of, for example, a CCD, and the size of the light receiving surface is, for example, a linear shape with a width of 11 μm and a length of 28 mm. Therefore, there are 4 slits in this length of 28 mm.
In order to accommodate the transmitted light of the concave mirror 6, the light receiving surface is located in front of or behind the focal point of the concave mirror 6.

＜考案の効果＞本考案によれば、線形の撮像素子と帯状の凹面
鏡を用いているので装置の厚みが可及的に小型化
される。また、レンズを用いていないので、装置
が小型化されるとともに、レンズの調整作業が不
要となり製造コストが安価になる。<Effects of the invention> According to the invention, since a linear image sensor and a band-shaped concave mirror are used, the thickness of the device can be reduced as much as possible. Furthermore, since no lens is used, the device can be made smaller, and there is no need to adjust the lens, resulting in lower manufacturing costs.

[Brief explanation of drawings]

第１図は本考案の実施例を示す図であつて、Ａ
図はその側面図、Ｂ図はその平面図である。第２
図は従来例を示す平面図である。１……原板、２……光源、４……遮光体、４ａ
……スリツト、５……平面鏡、６……凹面鏡、７
……撮像素子。 FIG. 1 is a diagram showing an embodiment of the present invention, in which A
The figure is a side view thereof, and the figure B is a plan view thereof. Second
The figure is a plan view showing a conventional example. 1... Master plate, 2... Light source, 4... Light shielding body, 4a
...Slit, 5...Plane mirror, 6...Concave mirror, 7
...Image sensor.

Claims

[Claims for Utility Model Registration] (1) A slit that transmits a two-dimensional image in a strip along a one-dimensional direction onto an original plate that is sent in a predetermined direction, and a slit that transmits light transmitted through the slit approximately parallel to the direction in which the original plate is transported. An electronic blackboard image reading system that has a strip-shaped concave mirror that reflects and focuses light, and a linear image sensor that receives the reflected light from the strip-shaped concave mirror, and that separates the two-dimensional image on the original plate into strips and converts them into electrical signals. Device. (2) The electronic whiteboard image reading device according to claim 1, which is a utility model, characterized in that a band-shaped reflecting mirror is interposed between the slit and the band-shaped concave mirror.