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1. (EP2756798) Reflection type photodetection apparatus, and biological information measuring apparatus

Office : European Patent Office
Application Number: 14163517 Application Date: 04.09.1998
Publication Number: 2756798 Publication Date: 23.07.2014
Publication Kind : A1
Designated States: DE, GB
IPC:
A61B 5/024
A61B 5/11
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
B
DIAGNOSIS; SURGERY; IDENTIFICATION
5
Measuring for diagnostic purposes; Identification of persons
02
Measuring pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography; Heart catheters for measuring blood pressure
024
Measuring pulse rate or heart rate
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
B
DIAGNOSIS; SURGERY; IDENTIFICATION
5
Measuring for diagnostic purposes; Identification of persons
103
Measuring devices for testing the shape, pattern, size or movement of the body or parts thereof, for diagnostic purposes
11
Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb
CPC:
A61B 5/681
A61B 5/02416
A61B 5/02427
A61B 5/02438
A61B 5/11
A61B 5/6826
A61B 5/6838
A61B 5/7257
A61B 2562/0219
Applicants: SEIKO EPSON CORP
Inventors: KOSUDA TSUKASA
KONDO YUTAKA
KURIHARA HAJIME
BABA NORIMITSU
Priority Data: 03078746 04.09.1998 EP
98941717 04.09.1998 EP
24142697 05.09.1997 JP
30891397 11.11.1997 JP
Title: (DE) Reflektive Photodetektionsvorrichtung und Vorrichtung zur Messung biologischer Informationen
(EN) Reflection type photodetection apparatus, and biological information measuring apparatus
(FR) Appareil de photodétection de type à réflexion et appareil de mesure d'informations biologiques
Abstract: front page image
(EN) When emitted light from LED 31 is incident on photodiodes 32 and 33 with luminance Pa and Pb, currents ia and ib are generated according to luminance Pa and Pb. When outside light is incident through the finger tissues on photodiodes 32 and 33 with luminance Pc, current ic is produced. The current il (= ia + ic) generated by photodiode 32, and the current i2 (= -ib-ic) generated by photodiode 33, are added at node X, and the current ic corresponding to outside light is thus cancelled. In addition, photodiodes 32 and 33 are disposed at different distances from LED 31. As a result, the current flowing to opamp 34 is current ia corresponding to luminance Pa because luminance Pb is extremely low. The opamp 34 then applies a current voltage conversion to generate pulse wave signal Vm.
Also published as:
EP0941694EP1405593EP1444948US6198951EP2859842WO/1999/012469