JPH0451626U

JPH0451626U -

Info

Publication number: JPH0451626U
Application number: JP9332990U
Authority: JP
Priority date: 1990-09-04
Filing date: 1990-09-04
Publication date: 1992-04-30

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す濃淡検出装置
の断面図、第２図は同じくその検出回路を示す図
、第３図は同じく被検出物の移動量に対する検出
回路の出力波形を示す図、第４図は従来の濃淡検
出装置の断面図、第５図は同じくその検出回路を
示す図、第６図は同じく被検出物の移動量に対す
る検出回路の出力波形を示す図である。１１……被検出物、１１ａ……淡部、１１ｂ…
…濃部、１２……濃淡検出装置本体、１３……発
光素子、１４，１６……反射光、１５……第一受
光素子、１７……第二受光素子、１８……検出回
路、２３……レンズ、３１……コンパレータ、Ａ
……前側照射位置、Ｂ……後側照射位置。 FIG. 1 is a sectional view of a density detection device showing an embodiment of the present invention, FIG. 2 is a diagram showing the detection circuit thereof, and FIG. 3 is a diagram showing the output waveform of the detection circuit with respect to the amount of movement of the object to be detected. 4 is a sectional view of a conventional density detection device, FIG. 5 is a diagram showing the detection circuit thereof, and FIG. 6 is a diagram showing the output waveform of the detection circuit with respect to the amount of movement of the object to be detected. 11... Object to be detected, 11a... Light part, 11b...
...Dark part, 12...Darkness detection device body, 13...Light emitting element, 14, 16...Reflected light, 15...First light receiving element, 17...Second light receiving element, 18...Detection circuit, 23... ...Lens, 31...Comparator, A
...front irradiation position, B...rear irradiation position.

Claims

[Scope of utility model registration request]

It is a device that non-contact detects the shading of an object whose shading changes alternately at equal intervals, and there is a sensor inside the shading detection device main body in the direction of movement of the object that moves relatively on the shading detection device main body. a light emitting element that has directivity in both directions in the front and back directions of a front irradiation position and a rear irradiation position; a first light receiving element that receives reflected light from the front irradiation position; and a first light receiving element that receives reflected light from the rear irradiation position. a second light-receiving element that receives light, the first light-receiving element and the second light-receiving element are arranged symmetrically on the same axis about the light-emitting element and are optically coupled, and the output of the first light-receiving element and , a density detection device comprising a detection circuit that compares the output of the second light receiving element and detects when the two outputs intersect to detect the density of the object to be detected.