JPS63191338U

JPS63191338U -

Info

Publication number: JPS63191338U
Application number: JP1936888U
Authority: JP
Priority date: 1988-02-17
Filing date: 1988-02-17
Publication date: 1988-12-09

Description

[Brief explanation of the drawing]

第１図は、本考案のプリント濃度補正装置が組
み込まれる引伸機の概略図、第２図は、本考案の
実施例によるプリント濃度補正装置の主要部を示
す斜視図、第３図は、第２図を参照して説明した
プリント濃度補正装置を使用した場合の拡大率に
対する露光時間誤差のパーセンテージを示すグラ
フ、第４図は、第３図に示した装置の水平断面図
、第５，６図は、基準位置と拡大位置における光
学系の位置関係を示す説明図である。１……ヘツド部、２……複写材料、３……載置
ステージ、４……光源、５……フイルタ、６……
シヤツタ、８……原板、１０……投影レンズ、１
１……支柱、１２……符号板、１２Ａ……光学的
コード、１４……検出器。 FIG. 1 is a schematic diagram of an enlarger incorporating the print density correction device of the present invention, FIG. 2 is a perspective view showing the main parts of the print density correction device according to an embodiment of the present invention, and FIG. 2 is a graph showing the percentage of exposure time error with respect to magnification when using the print density correction device described with reference to FIG. 4, FIG. 4 is a horizontal sectional view of the device shown in FIG. The figure is an explanatory diagram showing the positional relationship of the optical system at the reference position and the enlarged position. DESCRIPTION OF SYMBOLS 1... Head part, 2... Copying material, 3... Placement stage, 4... Light source, 5... Filter, 6...
Shutter, 8... Original plate, 10... Projection lens, 1
1... Strut, 12... Code plate, 12A... Optical code, 14... Detector.

Claims

[Claims for Utility Model Registration] A mounting stage for mounting copying materials, a support extending upward from the mounting stage, a light source,
a head section that includes a shutter, an original plate, and a projection lens and that is slidably provided along the column; an optical code that is provided on the column and indicates the position of the head section on the column; comprising an optical position detection means that reads a code, detects the position of the head portion, and issues a position signal; and a control means that controls the exposure time of the shutter based on this position signal, and the code is connected to the support column. an optical pattern having a Gray code pattern consisting of a combination of a large number of parallel lines of different lengths extending along the optical pattern; A print density correction device for an enlarger, characterized in that an element detects the presence or absence of each parallel line in the optical pattern.