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1. (WO1999012469) REFLECTION PHOTODETECTOR AND BIOLOGICAL INFORMATION MEASURING INSTRUMENT
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1999/012469 International Application No.: PCT/JP1998/003972
Publication Date: 18.03.1999 International Filing Date: 04.09.1998
IPC:
A61B 5/024 (2006.01) ,A61B 5/11 (2006.01)
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
Applicants:
SEIKO EPSON CORPORATION [JP/JP]; 4-1, Nishishinjuku 2-chome Shinjuku-ku Tokyo 163-0811, JP (AllExceptUS)
KOSUDA, Tsukasa [JP/JP]; JP (UsOnly)
KONDO, Yutaka [JP/JP]; JP (UsOnly)
KURIHARA, Hajime [JP/JP]; JP (UsOnly)
BABA, Norimitsu [JP/JP]; JP (UsOnly)
Inventors:
KOSUDA, Tsukasa; JP
KONDO, Yutaka; JP
KURIHARA, Hajime; JP
BABA, Norimitsu; JP
Agent:
KAWASAKI, Kenji ; Asahi Patent Office Yaesumasuya Building, 5th floor 2-16, Nihonbashi 3-chome Chuo-ku Tokyo 103-0027, JP
Priority Data:
9/24142605.09.1997JP
9/30891311.11.1997JP
Title (EN) REFLECTION PHOTODETECTOR AND BIOLOGICAL INFORMATION MEASURING INSTRUMENT
(FR) PHOTODETECTEUR A REFLEXION ET INSTRUMENT DE MESURE DE DONNEES BIOLOGIQUES
Abstract:
(EN) When the light from an LED (31) is incident to photodiodes (32 and 33) at illuminances (Pa and Pb), respectively, electric currents (ia and ib) corresponding to each illuminance are generated. When external light which arrives through the tissue of a finger is incident to the photodiodes (32 and 33) at an illuminance (Pc), an electric current (ic) is generated. The electric current (i1) (=ia+ic) generated in the photodiode (32) is added to the electric current (i2) (=-ib-ic) generated in the photodiode (33) at a node (X) and the electric current (ic) corresponding to the external light is offset. Since the photodiodes (32 and 33) are attached so that the distances from the LED (31) may be different from each other, the illuminance (Pb) is so extremely lowered that the electric current flowing into an operational amplifier (34) becomes the same as the current (ia) corresponding to the illuminance (Pa). The amplifier (34) generates a pulsating wave signal (Vm) through current-to-voltage conversion.
(FR) La lumière provenant d'une diode électroluminescente (LED) (31) frappe des photodiodes (32 et 33) selon certains éclairements lumineux (respectivement Pa et Pb), et produit des courants électriques (ia et ib) correspondant à chacun de ces éclairements lumineux. De même, la lumière extérieure qui pénètre les tissus d'un doigt frappe lesdites photodiodes (32 et 33) selon un éclairement lumineux (Pc) et produit un courant électrique (ic). Le courant électrique (i1) (= ia+ic) produit dans la photodiode (33), est additionné au courant électrique (i2) (= -ib-ic) produit à un noeud (X) de cette photodiode (33), le courant électrique (ic) correspondant à la lumière extérieure étant décalé. Les photodiodes (32 et 33) étant fixées de manière à ce que les distances les séparant de la LED (31) soient différentes, l'éclairement lumineux (Pb) est considérablement diminué. Le courant électrique qui alimente un amplificateur opérationnel (34) devient ainsi égal au courant (ia) correspondant audit éclairement lumineux (Pa). Cet amplificateur (34) produit un signal d'onde pulsatoire (Vm) par une conversion courant-tension.
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Designated States: JP, US
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
EP0941694EP1405593EP1444948US6198951EP2756798EP2859842