JP2022163384A - sensor device - Google Patents

Abstract

To provide a sensor device capable of measuring a degree of oxygen saturation even when being attached to fingers of different sizes.SOLUTION: A sensor device 1 includes: a ring 10 elastically deformed so as to extend in a circumferential direction according to a size of a finger to be inserted; a first component mounting part 21 incorporated between an inner peripheral surface 10c and an outer peripheral surface 10d of the ring 10; a second component mounting part 22 incorporated between the inner peripheral surface 10c and the outer peripheral surface 10d of the ring 10 while being deviated in the circumferential direction from the first component mounting part 21; a light emission part 30 mounted on the first component mounting part 21 and exposed to an inner space of the ring 10; a light receiving part 40 mounted on the second component mounting part 22, exposed to the inner space of the ring 10, and detecting strength of light emitted from the light emission part 30; and a first expansion/contraction part 23 incorporated between the inner peripheral surface 10c and the outer peripheral surface 10d of the ring 10, connecting the first component mounting part 21 and the second component mounting part 22, and expanding/contracting in the circumferential direction following the elastic deformation of the ring 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to sensor devices.

A pulse oximeter is a device that non-invasively measures oxygen saturation in arterial blood using light. A pulse oximeter includes a sensor device called a probe attached to a finger as a subject, a main body connected to the sensor device via a cable, and a control circuit built into the main body. The sensor device is provided with a light-emitting portion that emits red light and infrared light toward the finger, and a light-receiving portion that detects the intensity of light transmitted through the finger. The control circuit drives the light-emitting portion of the sensor device and calculates the oxygen saturation from the detection signal of the light-receiving portion of the sensor device. There is also a compact pulse oximeter in which the sensor device and main unit are integrated.

As methods for attaching a sensor device to a finger, there are a clamping type (see, for example, Patent Document 1), a winding type (see, for example, Patent Document 2), and an insertion type (see, for example, Patent Document 3).

A clamping type sensor device has a pair of clamping members that clamp the distal joint of a finger from the claw side and the ventral side, and a spring that applies a load in the direction of closing these clamping members. The light-emitting part and the light-receiving part are provided on a pair of holding members, respectively, and pressed against the surface of the finger by the elastic force of the spring. Since the pair of clamping members serve as mechanically movable parts, the sensor device becomes larger than the distal joint of the finger, and the spring gives the finger of the wearer a tightening feeling. Therefore, the wearer feels annoyed by the sensor device and removes it.

Wrap-around sensor devices have a flexible belt that wraps around a finger and a fastener, such as a hook-and-loop fastener, that joins overlapping portions of the belt. The light-emitting part and the light-receiving part are provided on the belt and are pressed against the surface of the finger by tightening the belt. However, the positions at which the light-emitting portion and the light-receiving portion contact the surface of the finger change according to the thickness of the finger. For example, when a belt is wrapped around a finger of appropriate thickness, the light-emitting unit and the light-receiving unit are arranged to face each other with the finger sandwiched between them, but when the belt is wrapped around a finger of inappropriate thickness, The light-emitting portion and the light-receiving portion are arranged at positions shifted from facing each other. Therefore, the measured value of the oxygen saturation varies according to the thickness of the finger.

An insertable sensor device has a tubular case. The light-emitting part and the light-receiving part are provided on the inner surface of the case and face the surface of the finger inserted into the case. However, if the finger is too thick compared to the case, the finger cannot be inserted into the case. On the other hand, if the finger is too thin, the light-emitting part and the light-receiving part are separated from the surface of the finger, resulting in an inaccurate oxygen saturation measurement value due to the influence of external light and the like. Therefore, it is necessary to prepare sensor devices of various sizes.

JP 2020-116299 A JP 2013-220312 A JP 2019-097771 A

Providing different sizes of insertable sensor devices leads to increased manufacturing and inventory costs.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sensor device capable of measuring oxygen saturation even when worn on fingers of different sizes.

The invention for achieving the above object is a ring that is elastically deformed so as to stretch in the circumferential direction according to the size of the inserted finger, and a first component that is built in between the inner peripheral surface and the outer peripheral surface of the ring. a mounting portion; a second component mounting portion which is displaced in the circumferential direction from the first component mounting portion and incorporated between the inner and outer peripheral surfaces of the ring; a light-emitting portion exposed to a space inside a ring; a light-receiving portion mounted on the second component mounting portion, exposed to a space inside the ring and detecting intensity of light emitted from the light-emitting portion; a first stretchable part built between the inner peripheral surface and the outer peripheral surface of the ring, connecting the first component mounting part and the second component mounting part, and expanding and contracting in the circumferential direction according to the elastic deformation of the ring. It is a sensor device. Other features of the present invention will be clarified by the description of the specification and drawings described later.

According to the present invention, the stretchable portion can be contracted in the circumferential direction, and the ring is elastically deformed. Therefore, when a finger is inserted into the ring, the ring stretches and expands in the circumferential direction according to the size of the finger. The portion extends in the circumferential direction according to the size of the finger. Therefore, no matter what size finger is inserted into the ring, the ring fits the size of the finger. Further, since the light-emitting portion and the light-receiving portion are in close contact with the surface of the finger, leakage of light emitted from the light-emitting portion is reduced, and the intensity of light can be reliably detected by the light-receiving portion. That is, according to the sensor device of the present invention, oxygen saturation can be measured even when worn on fingers of different sizes.

1 is a perspective view of a sensor device; FIG. 1 is a perspective view of the inside of a sensor device; FIG. 1 is a cross-sectional view of a sensor device; FIG. 4 is a cross-sectional view of the IV-IV cross section shown in FIG. 3; FIG.

Embodiments will be described below with reference to the drawings. However, although various technically preferable limitations are attached to the embodiments described below, the scope of the present invention is not limited to the following embodiments and illustrated examples.

[Sensor device and pulse oximeter]
FIG. 1 is a perspective view of a sensor device 1 worn on a finger as a subject. FIG. 2 is a perspective view of the interior of the sensor device 1. FIG. FIG. 3 is a cross-sectional view along the axial and radial directions. FIG. 4 is a sectional view of the IV-IV section shown in FIG. A finger as a subject is, for example, a portion to which the sensor device 1 of the pulse oximeter is attached, such as five fingers. The axial direction in this embodiment is the direction in which a finger is inserted into the ring 10 (described later), and the circumferential direction is the direction along the circumference of the ring 10 (described later).

The sensor device 1 is a part that constitutes a pulse oximeter that non-invasively measures oxygen saturation in arterial blood. The sensor device 1 is connected via a cable 50 to the main body (not shown) of the pulse oximeter. The sensor device 1 passes light of different wavelengths, such as red light with a wavelength of 660 nm and infrared light with a wavelength of 940 nm, through a finger and detects the intensity of the transmitted light. The main body of the pulse oximeter has a control circuit, a display device, etc., and the intensity of transmitted light detected by the sensor device 1 is output to the control circuit. The control circuit calculates the oxygen saturation in arterial blood from the ratio of the intensity fluctuation component of the transmitted light detected by the sensor device 1, and causes the display device to display the calculation result. Note that the sensor device 1 is also called a probe.

A sensor device 1 includes a ring 10 , a wiring structure 20 , a light emitter 30 , a light receiver 40 and a cable 50 .

[ring]
The ring 10 is made of a polymeric material having rubber elasticity, for example an elastomer. Elastomers can be, for example, thermoplastics or thermosets. Specifically, elastomers include, for example, rubbers, synthetic rubbers, natural rubbers, vulcanized rubbers, silicone rubbers, thermoplastic elastomers and thermosetting elastomers. The elastic modulus, or Young's modulus, of the elastomer used for the ring 10 is sufficiently low compared to metal, synthetic resin, glass, or the like. Rubber elasticity refers to a property in which the modulus of elasticity is sufficiently lower than that of metals, synthetic resins, glass, or the like, and large deformation is likely to occur.

The ring 10 is provided in a tubular shape, specifically a cylindrical shape, so that both ends in the axial direction are open. The inner peripheral surface 10c of the ring 10 in the natural state is cylindrical, and the outer peripheral surface 10d of the ring 10 is coaxial with the inner peripheral surface 10c. The inner diameter of the ring 10 in the natural state is set to such an extent that the tip of the distal joint of a general human finger (thumb, index finger, middle finger, ring finger or little finger) can be inserted into the ring 10 . In addition, the inner diameter of the ring 10 in the natural state is set smaller than the size of the portion of a general human finger extending from the middle to the proximal end of the distal joint. Therefore, when an ordinary person inserts the distal joint of the finger into the ring 10 from the tip thereof, the ring 10 extends in the circumferential direction at the intermediate portion of the distal joint. That is, the ring 10 is elastically deformed such that the inner side of the ring 10 is expanded by the intermediate portion of the distal segment. Therefore, the ring 10 tightens the distal segment inwards. The clamping force that the ring 10 exerts on the distal segment is such that it does not cause pain and discomfort to the person. When the distal joint of the finger is removed from the ring 10, the ring 10 restores its natural shape.

The ring 10 has an accommodation space 11 formed between an inner peripheral surface 10c and an outer peripheral surface 10d of the ring 10. As shown in FIG. In this embodiment, the accommodation space 11 is provided as follows.
The ring 10 has an inner tubular portion 12, an outer tubular portion 13, a first end 14 and a second end 15 made of elastomer. The outer tubular portion 13 surrounds the outer side of the inner tubular portion 12 , and the inner tubular portion 12 is separated from the inner peripheral surface 13 c of the outer tubular portion 13 to the inner side of the outer tubular portion 13 . Accordingly, the accommodation space 11 is formed between the outer peripheral surface 12 d of the inner tubular portion 12 and the inner peripheral surface 13 c of the outer tubular portion 13 . The inner peripheral surface 12c of the inner cylindrical portion 12 corresponds to the inner peripheral surface 10c of the ring 10, and the outer peripheral surface 13d of the outer cylindrical portion 13 corresponds to the outer peripheral surface 10d of the ring 10. As shown in FIG. Both the first end portion 14 and the second end portion 15 are ring-shaped members. The first end portion 14 is attached to one end of the inner cylinder portion 12 and the outer cylinder portion 13, and the second end portion 15 is attached to the other end of the inner cylinder portion 12 and the outer cylinder portion 13, thereby Space 11 is blocked.

[Wiring structure]
The wiring structure 20 is embedded between the inner peripheral surface 10c and the outer peripheral surface 10d of the ring 10. As shown in FIG. Specifically, the wiring structure 20 is housed in a housing space 11 formed between the inner peripheral surface 10c and the outer peripheral surface 10d of the ring 10 .

The wiring structure 20 is a flexible substrate. A flexible substrate is abbreviated as FPC (Flexible Printed Circuit), and is also called a flexible printed circuit board or a flexible printed wiring board. A flexible substrate is a laminate film on which a conductive wiring pattern is formed. The wiring structure 20 is provided as follows.

The wiring structure 20 has flexible component mounting portions 21 and 22 and stretchable portions 23 and 24 .

The component mounting portion 21 is a member incorporated between the inner peripheral surface 10 c and the outer peripheral surface 10 d of the ring 10 . The component mounting portion 22 is a member that is displaced from the component mounting portion 21 in the circumferential direction of the ring 10 and incorporated between the inner peripheral surface 10c and the outer peripheral surface 10d of the ring 10 . The component mounting portions 21 and 22 have flexibility. The component mounting section 21 is an example of a "first component mounting section", and the component mounting section 22 is an example of a "second component mounting section".

In this embodiment, the component mounting portions 21 and 22 are formed in a sheet shape. The component mounting portions 21 and 22 are housed in the housing space 11 while being curved along the outer peripheral surface 10 d of the inner cylindrical portion 12 . The component mounting portions 21 and 22 are arranged at positions shifted by 180° in the circumferential direction, and face each other with a space inside the inner cylindrical portion 12 interposed therebetween.

The expansion/contraction portion 23 is a member built in between the inner peripheral surface 10 c and the outer peripheral surface 10 d of the ring 10 and connecting the component mounting portion 21 and the component mounting portion 22 . The stretchable portion 23 is flexible and stretches in the circumferential direction according to the elastic deformation of the ring 10 . The expansion/contraction portion 24 is a member which is built in at a position opposite to the expansion/contraction portion 23 between the inner peripheral surface 10c and the outer peripheral surface 10d of the ring 10, and which connects the component mounting portion 21 and the component mounting portion 22. . The expansion/contraction portion 24 is flexible and expands/contracts in the circumferential direction according to the elastic deformation of the ring 10 . The elastic part 23 is an example of a "first elastic part", and the elastic part 24 is an example of a "second elastic part".

In this embodiment, the stretchable part 23 and the stretchable part 24 are housed in the housing space 11 . The expandable portion 24 is accommodated in the accommodation space 11 at a position on the opposite side of the expandable portion 23 . The expandable portions 23 and 24 connect the component mounting portions 21 and 22 on both sides of the component mounting portions 21 and 22 in the circumferential direction. The expansion/contraction portions 23 and 24 are bellows-folded or zigzag-folded, and the total extension of the expansion/contraction portions 23 and 24 from the component mounting portion 21 to the component mounting portion 22 extends in the circumferential direction from the component mounting portion 21 to the component mounting portion 22. Longer than the interval along. Specifically, the stretchable portion 23 has a plurality of curved portions 23a and straight portions 23b, and the curved portions 23a and the straight portions 23b are alternately repeated. The straight portion 23b extends in the axial direction. The curved portion 23a connects the ends of the adjacent straight portions 23b and is curved in an arc shape so as to be convex in the direction in which the straight portions 23b extend. The elastic portion 24 also has a plurality of curved portions 24a and linear portions 24b, like the elastic portion 23. As shown in FIG.

Such a bellows-fold or zigzag shape of the expandable sections 23 and 24 realizes expansion and contraction of the expandable sections 23 and 24 in the circumferential direction as the ring 10 is deformed. That is, when the ring 10 is deformed so as to expand in the circumferential direction and expand in diameter, the curved portions 23a and 24a of the expandable portions 23 and 24 expand, and the expandable portions 23 and 24 expand in the circumferential direction. On the other hand, when the ring 10 shrinks in the circumferential direction and deforms so as to reduce its diameter, the curved portions 23a and 24a of the expandable portions 23 and 24 are closed and the expandable portions 23 and 24 contract in the circumferential direction. Even if the expansion/contraction portions 23 and 24 expand and contract in the circumferential direction, the total extension of the wiring of the wiring pattern in the expansion/contraction portions 23 and 24 does not change. In addition, diameter expansion means that a diameter expands, and diameter reduction means that a diameter shrinks.

[Light-emitting part, light-receiving part and cable]
A light-emitting portion 30 is surface-mounted on the surface of the component mounting portion 21 facing the component mounting portion 22 .
A mounting hole 12 a is formed in the inner cylindrical portion 12 , and the light-emitting portion 30 is fitted in the mounting hole 12 a and exposed to the space inside the inner cylindrical portion 12 . The light emitting section 30 has two light emitting diodes 31 and 32 that emit light of different wavelengths. For example, light emitting diode 31 emits red light and light emitting diode 32 emits infrared light. The light emitting diodes 31 and 32 alternately emit light at a predetermined frequency. The central wavelength of the red light emitted by the light emitting diode 31 may be other than 660 nm, and the central wavelength of the infrared light emitted by the light emitting diode 32 may be other than 940 nm.

A light receiving section 40 is surface-mounted on the surface of the component mounting section 22 facing the component mounting section 21 .
A mounting hole 12 b is formed in the inner cylindrical portion 12 , and the light receiving portion 40 is fitted in the mounting hole 12 b and exposed to the space inside the inner cylindrical portion 12 . The light-emitting part 30 and the light-receiving part 40 are arranged at positions shifted by 180° in the circumferential direction, and face each other with a space inside the inner cylindrical part 12 interposed therebetween.

The light receiving section 40 receives the light emitted by the light emitting section 30 and converts the intensity of the light into an electrical signal. Here, the light receiving section 40 has at least one photodiode, and the intensity of the light emitted by the light emitting diodes 31 and 32 may be detected by a common photodiode or by separate photodiodes. good. If separate photodiodes are used, the photodiode that detects the light intensity of the light emitting diode 31 will have little response to the light of the light emitting diode 32, and the photodiode that detects the light intensity of the light emitting diode 32 will be the same as the light emitting diode 31. and responds little to light.

Cable 50 is a member that accommodates a wiring group. One end of the cable 50 passes through the first end 14 and is connected to the component mounting portion 21 . The other end of the cable 50 is detachably connected to the body of the pulse oximeter. The circumferential position where the cable 50 passes through the first end portion 14 is aligned with the circumferential positions of the light emitting portion 30 and the mounting hole 12a.

A wiring group in the cable 50 is connected to a wiring pattern of the component mounting section 21 . The light emitting diodes 31 and 32 are connected to wiring patterns of the component mounting portion 21 . The wiring for the light emitting section 30 is routed from the control circuit of the main body of the pulse oximeter to the light emitting section 30 through the cable 50 and the component mounting section 21 in order. Therefore, when a control signal is transferred from the control circuit of the main body to the light-emitting section 30 through the cable 50 and the wiring of the component mounting section 21, the light-emitting section 30 is driven and emits light.

Also, the wiring pattern of the component mounting section 21 is connected to the wiring pattern of the component mounting section 22 via the wiring patterns of the expandable sections 23 and 24 . The light receiving section 40 is connected to the wiring pattern of the component mounting section 22 . The wiring for the light receiving section 40 is routed to the control circuit through the component mounting section 22, the expansion/contraction sections 23 and 24, the component mounting section 21 and the cable 50 in this order. Therefore, the light intensity signal detected by the light receiving section 40 is transferred to the control circuit through the wiring of the component mounting section 22 , the elastic sections 23 and 24 , the component mounting section 21 and the cable 50 . A driver IC or the like for driving the light emitting section 30 may be surface-mounted on the component mounting section 21 , and an IC of a detection circuit for the light receiving section 40 may be surface mounted on the component mounting section 22 .

[Usage and operation of the sensor device]
The cable 50 is connected to the body of the pulse oximeter, and the user inserts the distal joint of the finger into the ring 10 . At this time, the cable 50 is arranged on the back side of the hand, the light emitting section 30 is arranged on the back side of the finger, and the light receiving section 40 is arranged on the pad side of the finger.

When the distal joint of the finger is inserted, the ring 10 is stretched in the circumferential direction and elastically deformed so as to expand in diameter. be guessed. When the ring 10 is elastically deformed so as to expand its diameter, the stretchable portions 23 and 24 are stretched in the circumferential direction accordingly.

The light-emitting diodes 31 and 32 of the light-emitting section 30 are driven by the control circuit of the main body, and the light-emitting diodes 31 and 32 emit light. Light emitted from the light-emitting diodes 31 and 32 passes through the distal joint of the finger, and transmitted light enters the light receiving section 40 . The light receiving section 40 detects the intensity of the transmitted light and outputs a signal representing the intensity of the transmitted light. The output signal of the light receiving section 40 is transferred to the control circuit through wiring of the component mounting section 22 , the elastic sections 23 and 24 , the component mounting section 21 and the cable 50 . The control circuit calculates the oxygen saturation from the output signal of the light receiving section 40 and causes the display device to display the calculation result.

After using the pulse oximeter, the user withdraws the distal joint of the finger from the ring 10 . Then, the ring 10 is restored to its natural shape, and the expandable portions 23 and 24 are contracted in the circumferential direction.

[advantageous effect]
(1) Since the elastic parts 23 and 24 are contractible in the circumferential direction and the ring 10 is elastically deformed, when the user inserts the finger into the ring 10, the elastic parts 23 and 24 are adapted to the size of the finger. , and the ring 10 expands in the circumferential direction to match the size of the user's finger. Therefore, regardless of the size of the user's finger, the ring 10 fits the size of the user's finger and fits snugly.

(2) Since the ring 10 is elastically deformed, the elastic force of the ring 10 brings the light emitting part 30 and the light receiving part 40 into close contact with the surface of the finger. Therefore, leakage of light emitted from the light emitting section 30 is small, and outside light is less likely to enter the light receiving section 40 . Therefore, light intensity detection and oxygen saturation measurement are accurate.

(3) The ring 10 has no mechanical moving parts and is compact and lightweight so that it can be worn on the user's finger. Therefore, the user wearing the sensor device 1 does not feel annoyed by the ring 10 and is not tempted to remove the sensor device 1 .

(4) Since the ring 10 has an annular shape, more specifically, an annular shape, when the user inserts the finger into the ring 10, the ring 10 tends to expand evenly in the circumferential direction. Therefore, regardless of the size of the finger, the positions at which the light emitting unit 30 and the light receiving unit 40 contact the surface of the finger do not vary. In other words, regardless of the size of the finger, the light-emitting portion 30 and the light-receiving portion 40 are arranged to face each other, the light-emitting portion 30 is brought into contact with the center of the nail, and the light-receiving portion 40 is brought into contact with the center of the pad of the finger. be able to. Therefore, the intensity of light passing through the finger is easily affected by arterial blood, and oxygen saturation can be measured accurately.

(5) Since the elastic portions 23 and 24 connect the component mounting portion 21 and the component mounting portion 22 on both sides of the component mounting portions 21 and 22, the ring 10 is expanded in the circumferential direction by a finger inserted into the ring 10, and the elongated portion 23 is expanded. , 24 are extended, the light-emitting portion 30 and the light-receiving portion 40 are unlikely to shift from the positions facing each other. In other words, even if the size of the finger inserted into the ring 10 changes, the sensor device 1 has a structure in which the positional relationship between the light emitting section 30 and the light receiving section 40 does not change. Therefore, regardless of the size of the finger inserted into the ring 10, oxygen saturation can be measured accurately.

(6) Since the expansion/contraction sections 23 and 24 connect the component mounting section 21 and the component mounting section 22 on both sides of the component mounting section 21 and 22, the component mounting section 21 is not stretched during the manufacturing process for assembling the wiring structure 20 to the ring 10. , 22, the positions of the light emitting unit 30 and the light receiving unit 40 are easily stabilized.

(7) Since the wiring structure 20, that is, the component mounting portions 21 and 22 and the expansion/contraction portions 23 and 24 are built in between the inner peripheral surface 10c and the outer peripheral surface 10d of the ring 10, the wiring structure 20 is protected. be.

(8) Since the expandable sections 23 and 24 are housed in the housing space 11, it is possible to prevent the expandable sections 23 and 24 from being restrained by being sandwiched between the inner tubular section 12 and the outer tubular section 13. Accordingly, as the ring 10 deforms, the expandable portions 23 and 24 can expand and contract without being restrained.

(9) Since the wiring of the light receiving section 40 is routed from the component mounting section 22 to the component mounting section 21 through the elastic sections 23 and 24, the wiring for the light receiving section 40 and the wiring for the light emitting section 30 are connected to the cable 50. can be summarized in

[Modification]
Although the embodiments for carrying out the present invention have been described above, the above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and interpret the present invention. Moreover, each component of the sensor device 1 may be changed from the above embodiment. Changes from the above embodiment will be described below. Two or more modifications described below may be applied in combination as much as possible.

(1) In the above embodiment, the light emitting section 30 is mounted on the component mounting section 21 connected to the cable 50, and the light receiving section 40 is mounted on the component mounting section 22 not connected to the cable 50. On the other hand, the light emitting portion 30 is mounted on the component mounting portion 22 that is not connected to the cable 50, and is fitted into the mounting hole 12b. It may be mounted and fitted into the mounting hole 12b. In this case, the wiring for the light emitting section 30 is routed to the control circuit in order through the component mounting section 22, the elastic sections 23 and 24, the component mounting section 21 and the cable 50, and the wiring for the light receiving section 40 is routed in order through the component mounting section 21 and the cable. 50 to the control circuit. The component mounting portion 21 on which the light receiving portion 40 is mounted corresponds to the second component mounting portion, and the component mounting portion 22 on which the light emitting portion 30 is mounted corresponds to the first component mounting portion.

(2) In the above embodiment, the inner cylindrical portion 12 in the natural state is separated from the inner peripheral surface 13c of the outer cylindrical portion 13 toward the inner side of the outer cylindrical portion 13, thereby forming the accommodation space 11. As shown in FIG. On the other hand, a recess may be formed in the outer peripheral surface 12 d of the inner tubular portion 12 or the inner peripheral surface 13 c of the outer tubular portion 13 , and the recess may serve as a space for accommodating the wiring structure 20 . In this case, the outer peripheral surface 12d of the inner tubular portion 12 and the inner peripheral surface 13c of the outer tubular portion 13 may be in contact with each other except for the concave portion.

(3) In the above embodiment, the expandable portions 23 and 24 are bellows-folded or zigzag-folded. On the other hand, the expandable/contractible portions 23 and 24 may be spirally wound to be expandable/contractible in the circumferential direction.

(4) In the above embodiments, the expandable sections 23 and 24 are made of flexible substrates. On the other hand, the expandable portions 23 and 24 may be made of lead wires instead of flexible substrates. In this case, the lead wire may be a fine metal wire that is accordion-folded, zig-zag-folded, or spiral-wound, and may have a structure that extends in accordance with the extension of the ring 10 .

(5) In the above embodiments, the component mounting portions 21 and 22 are made of flexible substrates. On the other hand, the component mounting portions 21 and 22 may be made of non-flexible circuit boards or bus bars.

(6) In the above embodiment, the component mounting sections 21 and 22 are connected by the two expandable sections 23 and 24 . On the other hand, the component mounting portions 21 and 22 may be connected by either one of the expansion/contraction portions 23 and 24 .

(7) The cable 50 may be arranged on the palm side, the light receiving section 40 may be brought into contact with the nail, and the light emitting section 30 may be brought into contact with the pad side of the finger.

(8) The ring 10 may be worn on the middle or proximal phalanx of the finger.

DESCRIPTION OF SYMBOLS 1... Sensor device 10... Ring 20... Wiring structure 21, 22... Component mounting part 23, 24... Expandable part 30... Light-emitting part 40... Light-receiving part

Claims (5)

a ring that elastically deforms so as to stretch in the circumferential direction according to the size of the finger to be inserted;
a first component mounting portion embedded between the inner peripheral surface and the outer peripheral surface of the ring;
a second component mounting portion displaced from the first component mounting portion in the circumferential direction and embedded between the inner peripheral surface and the outer peripheral surface of the ring;
a light-emitting portion mounted on the first component mounting portion and exposed to a space inside the ring;
a light receiving unit mounted on the second component mounting unit, exposed to the space inside the ring, and configured to detect intensity of light emitted from the light emitting unit;
a first stretchable part built in between the inner peripheral surface and the outer peripheral surface of the ring, connecting the first component mounting part and the second component mounting part, and expanding and contracting in the circumferential direction according to elastic deformation of the ring; A sensor device with The first stretchable portion is bellows-folded, zigzag-folded, or spirally wound, and the total extension of the first stretchable portion from the first component mounting portion to the second component mounting portion is from the first component mounting portion to the second component mounting portion. 2. The sensor device according to claim 1, wherein the distance is longer than the interval along the circumferential direction to the two-component mounting portion. 3. The sensor device according to claim 1, wherein said first component mounting portion, said second component mounting portion, and said first stretchable portion are made of a flexible substrate. It is built in between the inner peripheral surface and the outer peripheral surface of the ring and on the opposite side to the first stretchable portion, connects the first component mounting portion and the second component mounting portion, and 4. The sensor device according to any one of claims 1 to 3, further comprising a second expandable section that expands and contracts in the circumferential direction according to elastic deformation. 5. The sensor device according to claim 1, wherein the light emitting section and the light receiving section face each other with a space inside the ring.

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