JPS62198766U

JPS62198766U -

Info

Publication number: JPS62198766U
Application number: JP1985204732U
Authority: JP
Priority date: 1985-12-27
Filing date: 1985-12-27
Publication date: 1987-12-17
Also published as: JPH0445335Y2

Description

[Brief explanation of the drawing]

第１図は本考案の１実施例を示している要部回
路ブロツク図、第２図は本考案によるメモリに書
き込まれる特性表、第３図は撮像面照度分布図、
第４図は本考案による絞り補正タイミング例示図
である。１はビデオ信号ピーク値検出回路、２は絞り駆
動部、３はオートアイリスドライバ、４はメモリ
、５はＣＰＵである。 FIG. 1 is a main circuit block diagram showing one embodiment of the present invention, FIG. 2 is a characteristic table written in the memory according to the present invention, and FIG. 3 is an illuminance distribution diagram on the imaging surface.
FIG. 4 is a diagram showing an example of the aperture correction timing according to the present invention. 1 is a video signal peak value detection circuit, 2 is an aperture drive section, 3 is an auto iris driver, 4 is a memory, and 5 is a CPU.

補正昭６２．７．１０考案の名称を次のように補正する。考案の名称Ｘ線テレビ用光学絞り自動制御
装置Amendment July 10, 1982 The name of the invention is amended as follows. Name of invention Automatic optical diaphragm control device for X-ray television

Claims

[Scope of utility model registration request]

a pulse motor that drives an optical diaphragm in an optical system or inside an X-ray television camera lens; an auto iris driver that controls this pulse motor;
A peak value detection circuit that detects the peak value for one frame of the CU (camera controller) output video signal, and characteristic tables of luminous flux ratio vs. pulse motor displacement angle and video signal level peak value vs. imaging surface illuminance are written. Consisting of a memory and a CPU, the CPU reads the interframe video signal peak value Vtest of the test exposure from the peak value detection circuit, and specifies an address from that value to determine the corresponding captured image illuminance Etes.
t and the imaging surface illuminance Eo for the target video signal peak value Vo from the memory, read out the pulse motor displacement angle Niθ preset at the time of test exposure from the auto iris driver, and specify an address from that value to perform imaging at that time. Read out the luminous flux ratio Itest reaching the surface and the similar luminous flux ratio Iopen with respect to its displacement angle o, calculate from these read values the ratio Io/Iopen between the pulse motor displacement angle o and the luminous flux that provides the desired video signal level, An automatic optical diaphragm control device for an X-ray television, characterized in that a target motor displacement angle No.theta. is read from a memory based on this value and transferred to an auto iris driver.