JPS6465675A - Signal processor - Google Patents

Signal processor

Info

Publication number
JPS6465675A
JPS6465675A JP62223771A JP22377187A JPS6465675A JP S6465675 A JPS6465675 A JP S6465675A JP 62223771 A JP62223771 A JP 62223771A JP 22377187 A JP22377187 A JP 22377187A JP S6465675 A JPS6465675 A JP S6465675A
Authority
JP
Japan
Prior art keywords
voltage
output
signal
superposed
reflected
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
Application number
JP62223771A
Other languages
Japanese (ja)
Other versions
JPH07113947B2 (en
Inventor
Kazuo Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Priority to JP62223771A priority Critical patent/JPH07113947B2/en
Publication of JPS6465675A publication Critical patent/JPS6465675A/en
Publication of JPH07113947B2 publication Critical patent/JPH07113947B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To superpose a signal corresponding to a change in the impedance of a light receiving element to a prescribed reference voltage to output the superposed signal and to surely detect a signal of light reflected by white part by providing the titled device with the 1st and 2nd resistors, a comparator, a buffer circuit, and so on. CONSTITUTION:When light radiated from an LED 1 to a bar code face is reflected and the reflected light from a white part is inputted to a photo-transistor (TR) 2, the photodetecting quantity of the TR 2 is increased, current I3 is increased and the voltage of a node A is boosted. When the voltage of the point A exceeds the reference voltage VS, the output of an operational amplifier 12 to be a comparator is turned to a low level and charged to a capacitor 16 through a diode 18 as a holding voltage Ve. The voltage Ve is superposed to the voltage VS and the superposed voltage is impressed to the non-inversional input terminal of an operational amplifier 14 to be a buffer circuit, so that the output voltage of the amplifier 14 is dropped, current I2 is allowed to flow from the point A to the output terminal of the amplifier 14 through the 2nd resistor 13 and current I1 flowing into the 1st resistor 10 is reduced. Thus, the voltage of the point A is allowed to coincide with the voltage VS and the reflected light signal from the white part can be detected.
JP62223771A 1987-09-07 1987-09-07 Signal processor Expired - Fee Related JPH07113947B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62223771A JPH07113947B2 (en) 1987-09-07 1987-09-07 Signal processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62223771A JPH07113947B2 (en) 1987-09-07 1987-09-07 Signal processor

Publications (2)

Publication Number Publication Date
JPS6465675A true JPS6465675A (en) 1989-03-10
JPH07113947B2 JPH07113947B2 (en) 1995-12-06

Family

ID=16803450

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62223771A Expired - Fee Related JPH07113947B2 (en) 1987-09-07 1987-09-07 Signal processor

Country Status (1)

Country Link
JP (1) JPH07113947B2 (en)

Also Published As

Publication number Publication date
JPH07113947B2 (en) 1995-12-06

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees