JPS5610231A - Manuscript density detector - Google Patents

Manuscript density detector

Info

Publication number
JPS5610231A
JPS5610231A JP8465679A JP8465679A JPS5610231A JP S5610231 A JPS5610231 A JP S5610231A JP 8465679 A JP8465679 A JP 8465679A JP 8465679 A JP8465679 A JP 8465679A JP S5610231 A JPS5610231 A JP S5610231A
Authority
JP
Japan
Prior art keywords
frequency
photodiode
output
over
manuscript
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
JP8465679A
Other languages
Japanese (ja)
Other versions
JPS6313386B2 (en
Inventor
Hisao Tezuka
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP8465679A priority Critical patent/JPS5610231A/en
Publication of JPS5610231A publication Critical patent/JPS5610231A/en
Publication of JPS6313386B2 publication Critical patent/JPS6313386B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity

Abstract

PURPOSE:To detect manuscript density in a small pattern securely by amplifying output of a photodiode with a gain proportional to a frequency when a frequency component of the output of the photodiode comes at a maximum frequency or over. CONSTITUTION:A light from a light source 11 is reflected on a manuscript 12, the reflecting light is condensed through a lens system 13 and received on a photodiode 15 through a slit 14. When frequency component of an output of the photodiode 15 comes at a maximum frequency or over, the output of the photodiode 15 is controlled for voltage gain by AGC amplifier 18 with an output voltage of a frequency-voltage converter circuit 17, i.e. an output voltage proportional to a frequency maximum or over.
JP8465679A 1979-07-04 1979-07-04 Manuscript density detector Granted JPS5610231A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8465679A JPS5610231A (en) 1979-07-04 1979-07-04 Manuscript density detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8465679A JPS5610231A (en) 1979-07-04 1979-07-04 Manuscript density detector

Publications (2)

Publication Number Publication Date
JPS5610231A true JPS5610231A (en) 1981-02-02
JPS6313386B2 JPS6313386B2 (en) 1988-03-25

Family

ID=13836753

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8465679A Granted JPS5610231A (en) 1979-07-04 1979-07-04 Manuscript density detector

Country Status (1)

Country Link
JP (1) JPS5610231A (en)

Also Published As

Publication number Publication date
JPS6313386B2 (en) 1988-03-25

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