Manufacturing method of window member

Abstract

To provide a window member which can block light that is directly radiated to a light receiving element, of the light emitted by a luminous element and which can secure waterproof by firmly fastening the block part, and to provide the manufacturing method thereof and wearable devices equipped with the window member.SOLUTION: A window member is equipped with: a light permeable resin plate 23 in which a partition groove 25 is installed in a thickness direction on the outer periphery of a first light transmission area E1; and a first block part 24a which is buried in the partition groove 25 and which has a fused part 27 with a part fused in the boundary face inside the partition groove 25 and fastened on the resin plate 23. The first block part 24a is installed in the thickness direction in the partition groove 25 that is installed on the outer periphery of the first light transmission area E1, and thereby unnecessary light is blocked by the first block part 24a, and only necessary light can be taken in from the first light transmission area E1. Also, in the boundary face inside the partition groove 25, by a deposition part 27 with a part fused, the first block part 24a can be firmly fastened inside the partition groove 25 of the resin plate 23, and the waterproof of the partition groove 25 can be secured.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a window member used in electronic devices such as wrist-worn electronic devices and portable communication devices, a manufacturing method thereof, and a wearable device equipped with the window member. [Background technology]

[0002] For example, as described in Patent Document 1, a wrist-worn electronic device is known that includes a pulse sensor that measures the pulse by irradiating the arm with light from a light-emitting element and receiving the reflected light with a light-receiving element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-7887

[0004] This type of wrist-worn electronic device has an opening in the back cover attached to the underside of the case body, which is covered with a transparent window member, and a sensor board is attached to the inside of the back cover, with a pulse sensor attached to the sensor board in correspondence with the transparent window member. Summary of the Invention [Problem to be solved by the invention]

[0005] In such wrist-worn electronic devices, when measuring the pulse with a pulse sensor, it is necessary to make the light-emitting element emit light, irradiate the emitted light onto the arm through a transparent window member, and receive the reflected light of the irradiated light through the transparent window member with the light-receiving element.

[0006] However, in such wrist-worn electronic devices, some of the light emitted by the light-emitting element does not pass through the transparent window member and is irradiated directly onto the light-receiving element, so the light from the light-emitting element is reflected by the arm and passes through the window member, and only the reflected light cannot be received by the light-receiving element, making it impossible to measure the pulse accurately.

[0007] For this reason, in such wrist-worn electronic devices, it has been considered to form a partition groove around the periphery of a specified area of ​​a transparent window member corresponding to the light-receiving element, and to embed a light-shielding portion in this partition groove to block light outside the specified area.However, simply embedding a light-shielding portion in the partition groove does not provide sufficient fixing strength, and the problem arises that waterproofing cannot be ensured.

[0008] The problem to be solved by the present invention is to provide a window portion that can block light emitted by a light-emitting element from being directly irradiated onto a light-receiving element, and can firmly fix a light-blocking portion to ensure waterproofing. Material Manufacturing method The law The purpose is to provide. [Means for solving the problem]

[0010] Furthermore, this invention One The aspect is A method for manufacturing a window member that is disposed in a position that contacts a human body in a wearable device that includes a pulse sensor including a light receiving element and a light emitting element and seals the wearable device, comprising: a first step of molding, using a primary molding die, a light-transmitting resin plate including a first region corresponding to the light receiving element and a second region corresponding to the light emitting element, and a partition groove provided at least between the first region and the second region; a second step of embedding a light-shielding portion in the partition groove using a secondary molding die, and fixing the light-shielding portion to the resin plate by a welding portion formed at an interface between the light-shielding portion inside the partition groove and the resin plate; Including, The primary molding die and the secondary molding die are a common die, In the second step, a part of the interface between the resin plate and the light-shielding part is welded by residual heat of the common mold of the primary molding mold to form the welded part. , A method for manufacturing a window member. [Effects of the Invention]

[0011] According to this invention, it is possible to block light emitted by the light-emitting element that would otherwise be directly irradiated onto the light-receiving element, to firmly fix the light-shielding portion, and to ensure waterproofness. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is an enlarged front view showing an embodiment in which the present invention is applied to a wrist-worn electronic device; [Figure 2] 2 is an enlarged cross-sectional view of the wrist-worn electronic device shown in FIG. 1 taken along the line AA. [Figure 3] 3 is an enlarged cross-sectional view showing a main part of the wrist-worn electronic device shown in FIG. 2. FIG. [Figure 4] 4 is a diagram illustrating the principle of pulse measurement by the pulse sensor shown in FIG. 3. FIG. [Figure 5] 4 is an enlarged plan view showing the positional relationship of a plurality of light-emitting elements with respect to a light-receiving element of the pulse sensor shown in FIG. 3. [Figure 6] 4 is an enlarged front view of the window member shown in FIG. 3, viewed from the bottom side. FIG. [Figure 7] 7A and 7B show cross sections of the window member shown in FIG. 6, where (a) is an enlarged cross section as viewed from the arrow BB in FIG. 6, (b) is an enlarged cross section as viewed from the arrow CC in FIG. 6, and (c) is an enlarged cross section showing the partition groove of the window member and the first light-shielding portion embedded therein. [Figure 8] 7 is an enlarged plan view showing the inner surface of a first upper mold of a primary molding die for molding the window member shown in FIG. 6. FIG. [Figure 9] 9A and 9B show cross sections of the primary molding die shown in FIG. 8, where (a) is an enlarged cross section of the primary molding die as viewed from the arrow DD in FIG. 8, and (b) is an enlarged cross section of the primary molding die as viewed from the arrow EE in FIG. 8. [Figure 10] 6A and 6B show cross sections of a secondary molding die that secondarily molds a primary molded product formed by the primary molding die shown in FIG. 9, where (a) is an enlarged cross section of the secondary molding die as viewed from the arrow BB in FIG. 6, and (b) is an enlarged cross section of the secondary molding die as viewed from the arrow CC in FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment in which the present invention is applied to a wrist-worn electronic device will be described below with reference to FIGS. As shown in FIG. 1, this electronic device is a wearable device that is a wrist-mounted information terminal that is worn on the arm when in use, and includes a device case 1.

[0014] As shown in Figures 1 and 2, this device case 1 has band attachment parts 2 on the 12 o'clock side and the 6 o'clock side. These band attachment parts 2 are configured so that wristbands 3 can be attached to them with pin members 2a. In addition, push button switches 4 are provided on the 2 o'clock, 3 o'clock, and 4 o'clock sides of this device case 1.

[0015] As shown in FIGS. 1 and 2, this device case 1 includes a case main body 5 sized to be placed on the arm, and a first exterior member 6 and a second exterior member 7 attached to the outer periphery of this case main body 5. The case main body 5 is made of metal or hard synthetic resin. The first exterior member 6 is a bezel made of metal or synthetic resin, and is attached to the upper outer periphery of the case main body 5 via a ring-shaped parting member 8. The second exterior member 7 is a decorative piece made of metal or synthetic resin, and is attached to the outer periphery of the case main body 5 corresponding to the wristband 3.

[0016] 1 and 2, a transparent protective glass 10 is attached to the upper opening of the device case 1, i.e., the upper opening of the case body 5, via a packing 10a. In this case, a parting member 8 is disposed on the outer periphery of the upper surface of the transparent protective glass 10. The outer periphery of this parting member 8 is pressed against the transparent protective glass 10 by the first exterior member 6.

[0017] As shown in Fig. 2, a module 11 is disposed inside the device case 1, i.e., inside the case body 5. This module 11 includes a display device 12 that displays information and a pulse measuring device 13 (described later) that measures the pulse, as well as various other components (not shown) such as a circuit board that drives and controls these components, a communication unit required for wireless communication, and a battery.

[0018] 2, the display device 12 includes a flat display panel such as a liquid crystal display panel or an EL (electroluminescence) display panel, and is provided on the underside of the transparent protective glass 10. As a result, the display device 12 electro-optically displays various information such as time information such as the time and date, communication information, and pulse measurement results, and this displayed information can be seen from outside the device case 1 through the transparent protective glass 10.

[0019] 2, a back cover 14 is attached to the bottom of the device case 1, i.e., the bottom of the case body 5, via a waterproof ring 14a. The back cover 14 is made of metal such as stainless steel, and is configured to be pressed against the skin T (see FIG. 4) of the arm when the device case 1 is worn on the arm. In this case, the underside of the outer periphery of the back cover 14 located on the 12 o'clock and 6 o'clock sides is pressed from below by the presser parts 3a of the wristband 3.

[0020] 2 and 3, a circular protrusion 15 is formed in the center of the back cover 14, projecting downward. This circular protrusion 15 has a circular opening 16 that is smaller in diameter than its outer diameter. The inner periphery of this opening 16 is formed in a stepped shape with the front side (the bottom side in FIG. 3) wider than the inner side (the top side in FIG. 3), and a window member 17, described below, is fitted into the stepped front side of this opening 16. A pulse measuring device 13 is provided on the inner surface of the back cover 14, corresponding to the opening 16.

[0021] 2 and 3, pulse measurement device 13 includes sensor board 18 and pulse sensor 19. Sensor board 18 is formed in a disk shape larger than the inner diameter of opening 16, and is provided on the inner surface of back cover 14 so as to close opening 16. Sensor board 18 is electrically connected to the circuit board (not shown) of module 11 by a connecting member (not shown).

[0022] 2 and 3, pulse sensor 19 includes a light receiving element 20 and a plurality of light emitting elements 21, which are provided on the lower surface of sensor substrate 18 and are configured to be inserted into the stepped inner surface side (upper surface side in FIG. 3) of opening 16. As shown in FIG. 4, each of the plurality of light emitting elements 21 is a light emitting diode that emits green light, for example, light with a wavelength of 520 nm to 530 nm, which is easily absorbed by hemoglobin H in blood K, which is blood within the range illuminated by the light from the plurality of light emitting elements 21. As shown in FIG. 5, the plurality of light emitting elements 21 are arranged corresponding to the outer periphery of light receiving element 20.

[0023] On the other hand, the light receiving element 20 is a photodiode that receives light and outputs it as an electrical signal, as shown in Fig. 4, and is configured to receive reflected light of light irradiated onto the arm by each of the plurality of light emitting elements 21, and output an amount of power corresponding to the amount of light received as an electrical signal. In this embodiment, the light receiving element 20 is formed, for example, in a substantially rectangular shape with one corner cut out, as shown in Fig. 5, and is structured so that a light receiving portion 20a is provided on each of the other three sides except for one of the four sides of this substantially rectangular shape.

[0024] 5, the plurality of light-emitting elements 21 are provided on the sensor substrate 18 in a state facing the light-receiving sections 20a on the three sides of the light-receiving element 20 at a constant interval S. Therefore, the light-receiving element 20 is configured such that the light-receiving rate of each light-receiving section 20a is uniform when the light irradiated onto the arm by each of the plurality of light-emitting elements 21 is received by each light-receiving section 20a, since the plurality of light-emitting elements 21 are arranged at a constant interval S with respect to the light-receiving sections 20a on the three sides.

[0025] 2 and 3, a plurality of partition walls 22 are provided on the lower surface of the sensor substrate 18 to separate the plurality of light-emitting elements 21 from the light-receiving elements 20 and to separate the peripheries of the plurality of light-emitting elements 21. These partition walls 22 are light-shielding walls that regulate the emission region of light emitted by the plurality of light-emitting elements 21 and the incidence region of the light-receiving elements 20.

[0026] 2 and 3, the partition walls 22 are configured to prevent light emitted by the light-emitting elements 21 from being directly irradiated onto the light-receiving element 20. In this case, the partition walls 22 are formed so that their vertical length from the lower surface of the sensor substrate 18 is slightly longer than the thickness of the light-receiving element 20 and the light-emitting elements 21, and so as to protrude downward beyond the light-receiving element 20 and the light-emitting elements 21.

[0027] As a result, as shown in Figures 2 and 3, the pulse sensor 19 is configured such that the sensor board 18 is placed on the inner surface of the back cover 14, and when the light receiving element 20 and the multiple light emitting elements 21 are inserted into the stepped inner surface side (the upper surface side in Figure 3) of the opening 16, the partition wall 22 is pressed against the inner surface of the window member 17, so that the light receiving element 20 and the multiple light emitting elements 21 do not come into contact with the inner surface of the window member 17.

[0028] 2 and 3, window member 17 is used to close and seal opening 16 provided in protruding portion 15 of back cover 14, and is provided with a light-transmitting resin plate 23. This resin plate 23 is formed in a disk shape from a transparent or translucent synthetic resin such as acrylic (PMMA), polycarbonate (PC), or ABS resin.

[0029] 2 and 3, resin plate 23 is formed in a disk shape with an outer diameter the same as the inner diameter of the stepped surface side (the lower side in FIG. 3) of the inner periphery of opening 16 of back cover 14. As a result, resin plate 23 is fitted inside the stepped surface side of the inner periphery of opening 16, and in this state is fixed to the inner periphery of opening 16 by ultrasonic welding.

[0030] 6, resin plate 23 is provided with a first light-transmitting region E1, a plurality of second light-transmitting regions E2, and a light-shielding portion 24. First light-transmitting region E1 is provided corresponding to light-receiving element 20. A plurality of second light-transmitting regions E2 are provided corresponding to a plurality of light-emitting elements 21, respectively. Light-shielding portion 24 is provided by being embedded in partition groove 25 and partition recess 26 provided in resin plate 23, except for first and second light-transmitting regions E1, E2.

[0031] 7 and 8, the partition grooves 25 are located between the first light transmitting region E1 and the plurality of second light transmitting regions E2, i.e., at locations corresponding to the spaces between the light receiving element 20 and the plurality of light emitting elements 21, and are provided penetrating through the resin plate 23 in the thickness direction, i.e., in the front-to-back direction of the resin plate 23. As a result, the partition grooves 25 are located at the locations corresponding to the spaces between the light receiving sections 20a on three sides of the light receiving element 20 and the plurality of light emitting elements 21, i.e., between the first light transmitting region E1 and the plurality of second light transmitting regions E2, and are formed continuously in a substantially U-shape on all but one of the four sides of the light receiving element 20.

[0032] As shown in Figures 7(a) to 7(c), the opposing surfaces of the partition groove 25 are inclined with a draft angle of the primary molding die 30 described later so that the groove width on the front side (top side in Figure 7), which is one side of the resin plate 23, is wider than the groove width on the inner side (bottom side in Figure 7), which is the other side of the resin plate 23.

[0033] 7(a) to 7(c), a step 25a is provided on the opposing surface of the partition groove 25 so that the groove width on the front side of the resin plate 23 is wider than the groove width on the inner side of the resin plate 23. This step 25a is intended to prevent rattling of the first light-shielding portion 24a (described later) embedded in the partition groove 25 in the front-to-back direction, i.e., in the thickness direction of the resin plate 23.

[0034] 7 and 8, partition recesses 26 are provided over almost the entire surface (top surface in FIG. 7), which is one side of resin plate 23, excluding first and second light transmitting regions E1 and E2 and partition grooves 25. Partition recesses 26 are formed to a depth of about 1 / 2 to 1 / 3 the thickness of resin plate 23. In this case, boundary recesses 26a, which are slightly deeper than partition recesses 26, are provided in partition recesses 26 at locations located on the outer peripheries of the plurality of second light transmitting regions 2.

[0035] 6 and 7, the light-shielding portion 24 is made of the same material as the resin plate 23, for example, a light-transmitting synthetic resin such as acrylic (PMMA), polycarbonate (PC), or ABS resin, mixed with a black substance to form a light-shielding resin that blocks the transmission of light. The light-shielding portion 24 includes a first light-shielding portion 24a embedded in the partition groove 25 provided in the resin plate 23, and a second light-shielding portion 24b embedded in the partition recess 26.

[0036] 7(c), the first light-shielding portion 24a embedded in the partition groove 25 is attached to the resin plate 23 with a welded portion 27 formed by welding a portion of the first light-shielding portion 24a at the interface within the partition groove 25. That is, the first light-shielding portion 24a is formed by welding a portion of the interface between the resin plate 23 and the first light-shielding portion 24a within the partition groove 25 and forming the welded portion 27 when the resin plate 23 is heated by residual heat from a primary molding die 30 (described later) and the light-shielding resin of the light-shielding portion 24 is filled into the partition groove 25.

[0037] 7(c), the welded portion 27 is provided at a location biased toward the inner surface side (lower surface side in FIG. 7(c)) of the resin plate 23 opposite to the surface side (upper surface side in FIG. 7(c)), that is, from the inner surface (lower surface) of the resin plate 23 toward the surface side (upper surface side) over an area R of about 1 / 3 of the thickness of the resin plate 23. As a result, the welded portion 27 is formed to firmly fix the first light-shielding portion 24a within the partition groove 25 of the resin plate 23 and ensure waterproofing of the partition groove 25.

[0038] As shown in Figure 7(c), when the resin plate 23 is heated by the heat of the primary molding die 30 described later, the partition groove 25 is filled with the light-shielding synthetic resin of the first light-shielding portion 24a, and a portion of the resin plate 23 and the first light-shielding portion 24a are welded at the interface between the resin plate 23 and the first light-shielding portion 24a within the partition groove 25, a distortion occurs at the interface between the resin plate 23 and the first light-shielding portion 24a within the partition groove 25, and this distortion also causes the first light-shielding portion 24a to be firmly fixed to the resin plate 23.

[0039] 7(a) to 7(c), first light-shielding portion 24a is filled into partition groove 25 and solidified, and is configured so that when window member 17 is pressed against the arm, step portion 25a of partition groove 25 prevents first light-shielding portion 24a from being pushed in the thickness direction of resin plate 23. Therefore, first light-shielding portion 24a not only does not wobble in the thickness direction of resin plate 23, but also prevents displacement of welded portion 27 due to wobbling of first light-shielding portion 24a in the thickness direction of resin plate 23, preventing cracks from occurring in welded portion 27.

[0040] 6 and 7, second light-shielding portion 24b embedded in partition recess 26 is provided to cover the surface (top surface in FIG. 7) of resin plate 23 except for first light-transmitting region E1, the plurality of second light-transmitting regions E2, and first light-shielding portion 24a. Thus, resin plate 23 is configured such that first light-shielding portion 24a and second light-shielding portion 24b prevent light from passing through except for first light-transmitting region E1 and the plurality of second light-transmitting regions E2.

[0041] 7 and 8, boundary recesses 26a that are slightly deeper than the partition recesses 26 are provided in the partition recesses 26 at locations located on the outer peripheries of the plurality of second light-transmitting regions 2. As a result, the second light-shielding portions 24b embedded in the partition recesses 26 are also embedded in the boundary recesses 26a of the partition recesses 26. Therefore, the second light-shielding portions 24b are configured to prevent the occurrence of curling or gaps at locations located on the outer peripheries of the plurality of second light-transmitting regions 2.

[0042] Therefore, as shown in FIG. 3, when this window member 17 is attached to the opening 16 of the back cover 14 and the sensor board 18 is placed on the inner surface of the back cover 14 (the upper surface in FIG. 3), the partition wall 22 provided on the sensor board 18 is pressed against the first light-shielding portion 24a embedded in the partition groove 25 of the resin plate 23, and the partition wall 22 provided on the sensor board 18 is pressed against the resin plate 23 at a location corresponding to the boundary recess 26a in the second light-shielding portion 24b embedded in the partition recess 26 of the resin plate 23.

[0043] As a result, when the pulse sensor 19 is worn on the arm with the device case 1 and the window member 17 in close contact with the arm's skin T (see Figure 4) as shown in Figure 3, and the multiple light-emitting elements 21 emit light, the emitted light is prevented from being directly irradiated onto the light-receiving element 20 by the partition wall 22 of the sensor substrate 18 and the first light-shielding portion 24a embedded in the partition groove 25 of the resin plate 23 of the window member 17, and is instead transmitted through the multiple second light-transmitting areas E2 of the resin plate 23 and emitted to the outside.

[0044] Furthermore, as shown in Figure 3, when the device case 1 is worn on the arm and the window member 17 is in close contact with the skin T of the arm, the pulse sensor 19 is configured so that when light emitted from the multiple light-emitting elements 21 passes through the multiple second light-transmitting areas E2 of the resin plate 23 and is irradiated onto the arm, only the reflected light of the irradiated light passes through the first light-transmitting area E1 and is received by the multiple light-receiving sections 20a of the light-receiving element 20.

[0045] Next, a method for manufacturing the window member 17 will be described with reference to FIGS. The manufacturing method of this window member 17 includes a first step of molding a primary molded product using a primary molding die 30, and a second step of secondarily molding the primary molded product formed in this first step using a secondary molding die 31 to form a secondary molded product.

[0046] That is, the primary molding die 30 that molds the primary molded product in the first step includes a first lower die 32 and a first upper die 33, as shown in Figures 8 and 9. This primary molding die 30 is configured so that when the first lower die 32 and the first upper die are stacked one on top of the other, a first space portion 30a, which is called a cavity and has the same shape as the resin plate 23 that is the primary molded product, is formed between them.

[0047] 9(a) and 9(b), the first lower mold 32 is provided with a lower mold recess 32a that is approximately half the depth of the thickness of the resin plate 23 and has the same shape as the outer shape of the resin plate 23. The first upper mold 33 is provided with a first upper mold recess 33a that is approximately half the depth of the thickness of the resin plate 23 and has a shape corresponding to the first and second light transmitting regions E1, E2, a first protrusion 33b that forms a partition groove 25 that surrounds three sides of the first light transmitting region E1 of the resin plate 23, and a second protrusion 33c that forms a partition recess 26 that surrounds the first light transmitting region E1 and the plurality of second light transmitting regions E2.

[0048] As a result, when the primary molding die 30 is in a state in which the first lower die 32 and the first upper die 33 are stacked one on top of the other, as shown in Figures 9(a) and 9(b), a first space portion 30a of the same shape as the resin plate 23 is formed inside the primary molding die 30, except for the partition groove 25 and partition recess 26 in which the light-shielding portion 24 of the window member 17 is embedded.

[0049] 8 and 9, a light-transmitting resin such as acrylic (PMMA), polycarbonate (PC), or ABS resin is injected into the first space 30a from the first gate 33d provided at the location of the second protrusion 33c corresponding to one side of the first light-transmitting region E1 that is not provided with the partition groove 25 that surrounds the three sides of the first light-transmitting region E1, thereby forming the resin plate 23 as a primary molded product. In this way, the resin plate 23, which is the primary molded product, is formed in the first step.

[0050] Next, in the second step, the resin plate 23, which is the primary molded product, is secondarily molded in the secondary molding die 31 to form a secondary molded product. At this time, the first upper die 33 of the primary molding die 30 is released from the first lower die 32 in advance, and only the first upper die 33 is removed, leaving the resin plate 23, which is the primary molded product, in the first lower die 32. In this state, the second upper die 34 of the secondary molding die 31 is superimposed on the first lower die 32.

[0051] 10(a) and 10(b), the secondary molding die 31 has a first lower die 32 which is a die common to the primary molding die 30, and when a second upper die 34 is superimposed on the first lower die 32 with the resin plate 23, which is the primary molded product, remaining in this common first lower die 32, a second space portion 31a called a cavity is formed therein. In this case, a second upper die recess 34a having a flat surface which contacts the upper surface of the resin plate 23, i.e., the upper surfaces of the first and second light transmitting regions E1 and E2, is provided on the lower surface of the second upper die 34.

[0052] As a result, when the secondary molding mold 31 is in a state where the first lower mold 32 and the second upper mold 34, on which the primary molded product, the resin plate 23, remains, are stacked one on top of the other, as shown in Figures 10(a) and 10(b), a second space portion 31a of the same shape as the partition groove 25 and partition recess 26 into which the light-shielding portion 24 of the window member 17 is embedded, is formed inside the secondary molding mold 31.

[0053] In this state, a light-shielding resin made by mixing a black substance into a light-transmitting resin such as acrylic (PMMA), polycarbonate (PC), or ABS resin is injected into the second space portion 31a from the second gate 34b (see Figure 10(b)), which is a side gate provided on the side wall portion of the second upper mold 34 corresponding to the outer periphery of the partition recess 26 located on the upper side of the window member 17 shown in Figure 6, to form a light-shielding portion 24 within the partition groove 25 of the resin plate 23 and within the partition recess 26.

[0054] In this case, when the light-shielding resin mixed with the black substance is injected into the second space 31a, the resin plate 23, which is the primary molded product, is heated by residual heat from the first lower mold 32 of the primary molding mold 30. Therefore, at the interface between the resin plate 23 and the first light-shielding portion 24a injected into the partition groove 25, which is the second space 31a, a part of the resin plate 23 and the first light-shielding portion 24a are welded together, and a welded portion 27 is formed at the interface between the resin plate 23 and the first light-shielding portion 24a.

[0055] 7(c), the welded portion 27 is formed in a location biased toward the inner surface side (the lower surface side in FIG. 7(c)) opposite to the surface side (the upper surface side in FIG. 7(c)) of the resin plate 23, that is, in a region R that extends from the inner surface of the resin plate 23 toward the surface side, covering approximately one-third of the thickness of the resin plate 23. As a result, the welded portion 27 is formed so as to firmly fix the first light-shielding portion 24a within the partition groove 25 of the resin plate 23 and ensure waterproofing of the partition groove 25.

[0056] Also, at this time, as shown in Figure 7(c), when the resin plate 23 is heated by the residual heat of the first lower mold 32 and the first shading portion 24a is formed in the partition groove 25, a portion of the resin plate 23 and the first shading portion 24a are welded at the interface between the resin plate 23 and the first shading portion 24a in the partition groove 25, causing distortion at the interface between the resin plate 23 and the first shading portion 24a in the partition groove 25, and this distortion also firmly fixes the first shading portion 24a to the resin plate 23.

[0057] At this time, the light-shielding resin mixed with the black substance is also injected into the partition recesses 26 of the resin plate 23, which are the second space portions 31a, to form the second light-shielding portions 24b. The second light-shielding portions 24b filled into the partition recesses 26 are also embedded in the boundary recesses 26a, which are slightly deeper than the partition recesses 26. This prevents the second light-shielding portions 24b located on the outer peripheries of each of the plurality of second light-transmitting regions 2 from curling up or forming gaps. As a result, the window member 17, which is a secondary molded product, is formed in the second step.

[0058] Next, the procedure for attaching the window member 17 to the back cover 14 and assembling the pulse measuring device 13 to the back cover 14 will be described. In this case, window member 17 is fitted into the stepped lower part of the inner periphery of opening 16 provided in circular protrusion 15 of back cover 14, and in this state the outer periphery of window member 17 is fixed to the inner periphery of opening 16 by ultrasonic welding. This not only fixes window member 17 to opening 16 in back cover 14, but also ensures waterproofing between window member 17 and opening 16.

[0059] In this state, the pulse measuring device 13 is attached to the inner surface (top surface in FIG. 3) of the back cover 14. In this case, the pulse sensor 19 is attached in advance to the underside of the sensor board 18. That is, the pulse sensor 19 includes a substantially rectangular light receiving element 20 and a plurality of light emitting elements 21. When arranging the light receiving element 20 and the plurality of light emitting elements 21 on the underside of the sensor board 18, the plurality of light emitting elements 21 are arranged at a fixed interval S so as to correspond to the light receiving portions 20a on three sides of the light receiving element 20.

[0060] In this state, partition walls 22 having light-blocking properties are provided between the light receiving element 20 and the plurality of light emitting elements 21 and around the periphery of the plurality of light emitting elements 21. As a result, the light receiving element 20 and the plurality of light emitting elements 21 are surrounded by the partition walls 22. In this case, the partition walls 22 are formed so that their vertical length is longer than the thicknesses of the light receiving element 20 and the plurality of light emitting elements 21.

[0061] Then, the sensor board 18 is placed and attached to the inner surface of the back cover 14. At this time, the light receiving element 20, the plurality of light emitting elements 21, and the partition wall 22 of the pulse sensor 19 are inserted into the stepped upper portion of the inner periphery of the opening 16, so that the light receiving element 20 corresponds to the first light transmitting region E1 in the resin plate 23 of the window member 17, the plurality of light emitting elements 21 correspond to the plurality of second light transmitting regions E2 of the resin plate 23, respectively, and the partition wall 22 corresponds to the first light blocking portion 24a of the light blocking portion 24 embedded in the resin plate 23.

[0062] In this state, the sensor board 18 is pressed against the inner surface of the back cover 14. This causes the partition wall 22 to press against the inner end surface of the first light-shielding portion 24a embedded in the partition groove 25 of the resin plate 23, and also against the inner surface of the resin plate 23 at a location corresponding to the boundary recess 26a in the second light-shielding portion 24b embedded in the partition recess 26 provided in the resin plate 23. At this time, the partition wall 22 is formed to be longer in the vertical direction than the thicknesses of the light-receiving element 20 and the plurality of light-emitting elements 21, so that the light-receiving element 20 and the plurality of light-emitting elements 21 do not come into contact with the inner surface of the window member 17.

[0063] As a result, in the pulse sensor 19, light emitted by the plurality of light-emitting elements 21 is blocked by the partition wall 22 of the sensor substrate 18 and the first light-shielding portion 24a embedded in the partition groove 25 of the resin plate 23, and is therefore not directly irradiated onto each light-receiving portion 20a of the light-receiving element 20. Therefore, the light emitted by the plurality of light-emitting elements 21 passes only through the plurality of second light-transmitting regions E2 provided in the resin plate 23 of the window member 17 and is emitted to the outside. Furthermore, the light-receiving element 20 receives only the light that has passed only through the first light-transmitting region E1 of the resin plate 23 at the light-receiving portions 20a on three sides.

[0064] Next, a case where a pulse is measured by the pulse measuring device 13 of such an electronic device will be described. In this case, first, device case 1 is attached to the arm with wristband 3. Then, back cover 14 of device case 1 is placed on the arm. At this time, window member 17 provided in opening 16 of protrusion 15 of back cover 14 is pressed against the arm by protrusion 15 of back cover 14, so that the surface of window member 17 (the underside in FIG. 3 ) comes into close contact with skin T of the arm.

[0065] When measuring the pulse in this state, first, the plurality of light-emitting elements 21 are caused to emit light simultaneously. This causes the plurality of light-emitting elements 21 to emit green light with a wavelength of 520 nm to 530 nm, and this emitted light is emitted only from the plurality of second light-transmitting regions E2 of the resin plate 23 and irradiated onto the arm. At this time, the light emitted by the plurality of light-emitting elements 21 is blocked by the partition wall 22 of the sensor substrate 18 and the first light-shielding portion 24a embedded in the partition groove 25 of the resin plate 23 of the window member 17, and therefore is not directly irradiated onto the light-receiving element 20.

[0066] In this way, when light emitted from the plurality of light-emitting elements 21 is irradiated onto the arm, the irradiated light is reflected by the skin T, and the reflected light passes through the first light-transmitting region E1 of the resin plate 23 of the window member 17 and is received by each light-receiving portion 20a of the light-receiving element 20. That is, the light irradiated onto the skin T is irradiated onto the blood K in the blood vessel P, but because the irradiated light is green light with a wavelength of 520 nm to 530 nm, it is absorbed by the hemoglobin H in the blood K.

[0067] Therefore, the amount of reflected light changes according to the amount of hemoglobin H in the blood K, and the amount of light received by each light receiving portion 20a of the light receiving element 20 changes. That is, when the pulse beats, the volume of the blood vessel P and the amount of blood K change, and accordingly, the amount of light absorbed by the hemoglobin H in the blood K also changes. Thus, the pulse is measured by measuring the increase or decrease in the amount of received light and calculating the pulse rate.

[0068] At this time, the light emitted by the plurality of light-emitting elements 21 is blocked by the partition wall 22 of the sensor substrate 18 and the first light-shielding portion 24a embedded in the partition groove 25 of the resin plate 23, and is therefore not directly irradiated onto each light-receiving portion 20a of the light-receiving element 20. Therefore, the light emitted by the plurality of light-emitting elements 21 is transmitted only through the plurality of second light-transmitting regions E2 provided in the resin plate 23 of the window member 17 and is irradiated onto the skin T. Furthermore, of the reflected light of this irradiated light, only the light that is transmitted only through the first light-transmitting region E1 of the resin plate 23 is received by each light-receiving portion 20a of the light-receiving element 20. Therefore, the pulse can be measured accurately.

[0069] Thus, the window member 17 of this electronic device comprises a light-transmitting resin plate 23 having a partition groove 25 penetrating in the thickness direction in a portion of the outer periphery of a first light-transmitting region E1, which is a predetermined region, and a first light-shielding portion 24a embedded in the partition groove 25 and having a welding portion 27 partially welded at the interface within the partition groove 25 and fixed to the resin plate 23, thereby making it possible to accurately take in only the necessary light from the first light-transmitting region E1, firmly fix the first light-shielding portion 24a, and ensure waterproofness.

[0070] That is, in the window member 17 of this electronic device, the partition groove 25 of the resin plate 23 is provided so as to penetrate through the resin plate 23 in the thickness direction, that is, from the front to the back, and the first light-shielding portion 24a is embedded in this partition groove 25 so as to penetrate through the resin plate 23 in the thickness direction, so that the first light-shielding portion 24a reliably blocks unnecessary light outside the first light-transmitting region E1 and can accurately take in only the necessary light from the first light-transmitting region E1.

[0071] Furthermore, in the window member 17 of this electronic device, a welded portion 27 is formed by welding a portion of the resin plate 23 to the first shading portion 24a embedded in the partition groove 25 at the interface within the partition groove 25 of the resin plate 23, and this welded portion 27 allows the first shading portion 24a to be fixed to the resin plate 23, thereby firmly fixing the first shading portion 24a within the partition groove 25 of the resin plate 23 and ensuring waterproofing of the partition groove 25 by the welded portion 27.

[0072] Furthermore, the window member 17 of this electronic device includes a first light-transmitting region E1 corresponding to the light-receiving element 20 and a second light-transmitting region E2 corresponding to the light-emitting element 21, a light-transmitting resin plate 23 having a partition groove 25 penetrating in the thickness direction between the outer periphery of the first light-transmitting region E1 corresponding to the light-receiving portion 20a of the light-receiving element 20 and the outer periphery of the corresponding second light-transmitting region E2, and a first light-shielding portion 24a embedded in the partition groove 25 and having a welding portion 27 where a portion of the interface within the partition groove 25 is welded and fixed to the resin plate 23. This makes it possible to block light emitted by the light-emitting element 21 that would otherwise be directly irradiated onto the light-receiving element 20, and to accurately take in only the necessary light from the first light-transmitting region E1, and also to firmly fix the first light-shielding portion 24a while ensuring waterproofness.

[0073] That is, in the window member 17 of this electronic device, a partition groove 25 is provided between the outer periphery of the first light-transmitting region E1 of the resin plate 23 corresponding to the light-receiving element 20 and the outer periphery of the second light-transmitting region E2 corresponding to the light-emitting element 21, penetrating in the thickness direction of the resin plate 23, that is, in the front-to-back direction, and a first light-shielding portion 24a is embedded in this partition groove 25, penetrating in the thickness direction of the resin plate 23, so that this first light-shielding portion 24a can reliably block unnecessary light outside the first light-transmitting region E1, and only the necessary light can be accurately taken in from the first light-transmitting region E1.

[0074] Furthermore, in the window member 17 of this electronic device, a welded portion 27 is formed by welding a portion of the resin plate 23 to the first shading portion 24a embedded in the partition groove 25 at the interface within the partition groove 25 of the resin plate 23, and this welded portion 27 allows the first shading portion 24a to be fixed to the resin plate 23, thereby firmly fixing the first shading portion 24a within the partition groove 25 of the resin plate 23 and ensuring waterproofing of the partition groove 25 by the welded portion 27.

[0075] In this case, the window member 17 has a plurality of second light-transmitting regions E2 provided at a plurality of locations on the outer periphery of the first light-transmitting region E1 corresponding to the plurality of light-receiving sections 20a provided in the light-receiving element 20, so that the plurality of second light-transmitting regions E2 can emit light emitted by the plurality of light-emitting elements 21 to the outside of the window member 17, and the reflected light of the emitted light can be accurately captured from the first light-transmitting region E1 and can be received well by the plurality of light-receiving sections 20a of the light-receiving element 20.

[0076] That is, in this window member 17, the light receiving element 20 is formed in an approximately rectangular shape, and light receiving portions 20a are provided on three sides of this approximately rectangular shape, and a plurality of light emitting elements 21 are arranged at a constant interval S corresponding to the light receiving portions 20a on these three sides, so that a plurality of second light transmitting regions E2 corresponding to the plurality of light emitting elements 21 can be arranged corresponding to the three sides of the first light transmitting region E1 corresponding to the light receiving element 20, and thereby each light emitted by the plurality of light emitting elements 21 passes through each of the plurality of second light transmitting regions E2, and each reflected light of this transmitted light can be accurately captured from the first light transmitting region E1 and can be reliably and satisfactorily received by each light receiving portion 20a of the light receiving element 20.

[0077] In this case, the multiple light-emitting elements 21 are respectively provided on the sensor substrate 18 facing the light-receiving sections 20a on the three sides of the light-receiving element 20 at a fixed interval S. Therefore, when the multiple light-emitting elements 21 are caused to emit light simultaneously and irradiate the arm, and the reflected light of each of the irradiated light is received by each light-receiving section 20a of the light-receiving element 20, the light-receiving rate of each light-receiving section 20a can be made uniform, thereby enabling the pulse to be measured with high accuracy.

[0078] Furthermore, in this window member 17, the welding portion 27 is provided at a location biased toward the inner surface, which is the other surface opposite to the front surface, of the resin plate 23, so that the first shading portion 24a embedded in the partition groove 25 and the resin plate 23 can be easily and satisfactorily welded at the interface within the partition groove 25 of the resin plate 23.

[0079] That is, in this window member 17, when the light-shielding portion 24 is embedded in the resin plate 23 and molded using the secondary molding die 31, the first light-shielding portion 24a is molded while the resin plate 23 is heated using the residual heat of the first lower die 32 in the secondary molding die 31, thereby making it possible to easily and satisfactorily weld the resin plate 23 and the first light-shielding portion 24a at the interface within the partition groove 25 of the resin plate 23.

[0080] In this case, in this window member 17, the area where the resin plate 23 is heated by the residual heat of the first lower mold 32 in the secondary molding mold 31 is the inner side opposite to the surface side of the resin plate 23, so that an area R of about 1 / 3 of the thickness of the resin plate 23 is welded from the inner side of the resin plate 23 toward the surface side, forming a welded portion 27.This welded portion 27 can firmly fix the first shading portion 24a within the partition groove 25 of the resin plate 23 and ensure waterproofing of the partition groove 25.

[0081] Furthermore, since this welding portion 27 has distortion that occurs at the interface between the resin plate 23 and the first shading portion 24a within the partition groove 25, this distortion can also firmly fix the first shading portion 24a within the partition groove 25 of the resin plate 23, and can ensure waterproofing of the partition groove 25.

[0082] That is, in this window member 17, when the resin plate 23 is heated by the residual heat of the first lower mold 32 in the secondary molding mold 31 and the resin plate 23 and the first shading portion 24a are welded at the interface within the partition groove 25 of the resin plate 23, distortion occurs at the interface between the resin plate 23 and the first shading portion 24a, and this distortion makes it possible to firmly fix the first shading portion 24a within the partition groove 25 of the resin plate 23 and ensure waterproofing at the partition groove 25.

[0083] Furthermore, in this window member 17, the opposing surface of the partition groove 25 of the resin plate 23 is inclined with a draft gradient so that the groove width on the front side, which is one surface of the resin plate 23, is wider than the groove width on the inner side, which is the other surface of the resin plate 23.As a result, when the resin plate 23 is molded using the primary molding die 30 and then released, even if a first protrusion 25a that forms the partition groove 25 is provided in the first upper die 33, this first protrusion 25a can be easily removed from within the resin plate 23 due to the inclination of the draft gradient, so that the primary molding die 30 can be released smoothly and successfully.

[0084] Furthermore, in this window member 17, a step portion 25a is provided on the opposing surface of the partition groove 25, so that when the first shading portion 24a is embedded in the partition groove 25, the step portion 25a of the partition groove 25 can receive the first shading portion 24a so that the first shading portion 24a is not pushed in the thickness direction of the resin plate 23.

[0085] Therefore, in this window member 17, the step portion 25a of the partition groove 25 prevents the first shading portion 24a from wobbling in the thickness direction of the resin plate 23, thereby preventing the welded portion 27 from shifting in position due to wobbling of the first shading portion 24a in the thickness direction of the resin plate 23 and preventing cracks from occurring in the welded portion 27.

[0086] Furthermore, the manufacturing method of this window member 17 includes a first step of molding, using a primary molding die 30, a light-transmitting resin plate 23 having a partition groove 25 penetrating in the thickness direction along a portion of the outer periphery of the first light-transmitting region, and a second step of embedding, using a secondary molding die 31, a first light-shielding portion 24a in the partition groove 25 and welding a portion of the interface between the first light-shielding portion 24a in the partition groove 25 and the resin plate 23 to form a welded portion 27, thereby fixing the first light-shielding portion 24a to the resin plate 23, thereby enabling the window member 17 to be manufactured satisfactorily.

[0087] That is, in the manufacturing method of this window member 17, when the resin plate 23 is molded in the primary molding die 30 in the first step, the first lower die 32 and the first upper die 33 of the primary molding die 30 are overlapped and the first protrusion 33b and the second protrusion 33c of the first upper die are positioned in the lower die recess 32a of the first lower die 32, thereby forming a first space portion 30a, which is called a cavity, in the primary molding die 30 and has the same shape as the resin plate 23 excluding the partition groove 25 and the partition recess 26, and light-transmitting resin can be poured into this first space portion 30a, thereby successfully molding the resin plate 23 as a primary molding.

[0088] Furthermore, in the manufacturing method of this window member 17, when the secondary molded product is molded in the secondary molding die 31 in the second step, the resin plate 23, which is the primary molded product, is left in the first lower die 32 of the primary molding die 30, and the second upper die 34 is superimposed on this first lower die 32, and the first and second light-transmitting regions E1, E2 of the resin plate 23 are positioned in the second upper die recess 34a of the second upper die 34, thereby forming a second space portion 31a, which is called a cavity, having the same shape as the partition groove 25 and the partition recess 26, and light-blocking resin can be poured into this second space portion 31a to satisfactorily form the window member 17, which is the secondary molded product.

[0089] In this case, in the manufacturing method of this window member 17, the primary molding die 30 and the secondary molding die 31 are provided with a common first lower die 32, so that the primary molding die 30 and the secondary molding die 31 can share the first lower die 32, which simplifies the mold manufacturing process and reduces the cost of mold manufacturing.Furthermore, when the primary molding die 30 is released, the resin plate 23, which is the primary molded product, is left in the first lower die 32 and the first upper die is released, which simplifies the demolding process and improves productivity.

[0090] Furthermore, in the manufacturing method of this window member 17, in the second step, a portion of the interface between the resin plate 23, which is the primary molded product, and the first shading portion 24a is welded using the residual heat of the common first lower mold 32 of the primary molding mold 30 to form a welded portion 27, and when a shading resin is poured into the second space portion 31a of the secondary molding mold 31 to form the first shading portion 24a, the resin plate 23 can be heated by the residual heat of the first lower mold 32.

[0091] As a result, in this manufacturing method of window member 17, the light-shielding resin of first light-shielding portion 24a poured into partition groove 25 of second space portion 31a in the second step can be reliably and satisfactorily welded to resin plate 23 at a part of the interface therebetween, so that welded portion 27 can be formed satisfactorily at a part of the interface between resin plate 23 and first light-shielding portion 24a, and distortion can be generated in welded portion 27. Therefore, first light-shielding portion 24a can be firmly fixed within partition groove 25 of resin plate 23, and waterproofing of partition groove 25 can be ensured.

[0092] In the above-described embodiment, the resin plate 23 and the light-shielding portion 24 are formed from the same synthetic resin material, but the present invention is not limited to this. For example, the resin plate 23 and the light-shielding portion 24 may be formed from different synthetic resin materials. In this case, it is desirable to pour in a material having a higher melting point than the material poured in during the primary molding during the secondary molding. That is, in the above-described embodiment, it is desirable to form the light-shielding portion 24 from a material whose melting point is higher than that of the resin plate 23.

[0093] This makes it easier for a welded portion to form between the light-shielding portion 24 and the resin plate 23 during secondary molding. In addition, in this embodiment, the resin plate 23 is formed during primary molding, and the light-shielding portion 24 is formed during secondary molding, but the order of formation may be reversed. In that case, when the resin plate 23 and the light-shielding portion 24 are formed from synthetic resins of different materials, it is desirable to form the light-shielding portion 24 from a material whose melting point is lower than that of the resin plate 23.

[0094] Furthermore, in the above-described embodiment, the light receiving element 20 is formed in an approximately rectangular shape, and the light receiving portion 20a is provided on three sides of this approximately rectangular shape, but the present invention is not limited to this, and for example, the light receiving element may have a structure in which a light receiving portion is provided on two sides, or the light receiving element may be formed in a polygonal shape such as a pentagon or hexagon, and light receiving portions may be provided on four or more sides.

[0095] Furthermore, in the above-described embodiment, the welded portion 27 is provided over the region R that is approximately one-third of the thickness of the resin plate 23 from the inner surface toward the surface of the resin plate 23, but this is not limiting, and the range over which the welded portion is provided may be changed. For example, the welded portion may be provided from the inner surface of the resin plate 23 to the step portion 25a, making it easier to prevent rattle and maintain waterproofing.

[0096] Furthermore, in the above-described embodiment, the present invention is described as being applied to a wrist-worn electronic device, but the present invention does not necessarily have to be applied to a wrist-worn electronic device, and can also be applied to electronic devices such as portable communication devices.

[0097] Although one embodiment of the present invention has been described above, the present invention is not limited to this and includes the inventions set forth in the claims and their equivalents. The inventions described in the claims of this application are as follows:

[0098] (Addendum) The invention described in claim 1 is a window member characterized by comprising: a light-transmitting resin plate having a partition groove formed in the thickness direction along at least a portion of the outer periphery of a predetermined area; and a light-shielding portion embedded in the partition groove, having a molten portion that is partially melted at the interface within the partition groove, and fixed to the resin plate.

[0099] The invention described in claim 2 is a window member characterized by comprising: a light-transmitting resin plate having a first region corresponding to a light-receiving element and a second region corresponding to a light-emitting element, and a partition groove provided in the thickness direction between the outer periphery of the first region corresponding to the light-receiving portion of the light-receiving element and the outer periphery of the second region corresponding to the light-emitting element; and a light-shielding portion embedded in the partition groove and having a molten portion where a portion of the interface within the partition groove is melted and fixed to the resin plate.

[0100] The invention described in claim 3 is a window member characterized in that, in the window member described in claim 2, the second region is provided in multiple locations on the outer periphery of the first region corresponding to multiple light receiving sections provided in the light receiving element.

[0101] The invention described in claim 4 is a window member characterized in that, in the window member described in any one of claims 1 to 3, the molten portion is provided in a location biased toward the other surface located opposite to the one surface of the resin plate.

[0102] The invention described in claim 5 is a window member characterized in that, in the window member described in any one of claims 1 to 4, the molten portion has a distortion that occurs at the interface between the resin plate and the light-shielding portion within the partition groove.

[0103] The invention described in claim 6 is a window member characterized in that, in the window member described in any one of claims 1 to 5, the opposing surface of the partition groove is inclined with a draft angle so that the groove width on the one side of the resin plate is wider than the groove width on the other side of the resin plate.

[0104] The invention as set forth in claim 7 is the window member as set forth in any one of claims 1 to 6, The window member is characterized in that a step portion is provided on the opposing surface of the partition groove.

[0105] An eighth aspect of the present invention provides the window member according to any one of the first to seventh aspects, wherein the light blocking portion has a melting point higher than the melting point of the resin plate.

[0106] The invention described in claim 9 is a method for manufacturing a window member, characterized by comprising: a first step of molding, using a primary molding die, a light-transmitting resin plate having a partition groove provided in the thickness direction along at least a portion of the periphery of a predetermined region; and a second step of embedding a light-shielding portion in the partition groove using a secondary molding die, thereby forming a molten portion by melting a portion of the interface between the light-shielding portion in the partition groove and the resin plate, and fixing the light-shielding portion to the resin plate.

[0107] The invention described in claim 10 is a method for manufacturing a window member described in claim 9, characterized in that the primary molding die and the secondary molding die have a common lower die, and in the second step, the residual heat of the common lower die of the primary molding die is used to melt the portion at the interface between the resin plate and the light-shielding portion, thereby forming the molten portion.

[0108] An eleventh aspect of the present invention is an electronic device comprising the window member according to any one of the first to eighth aspects of the present invention. [Explanation of symbols]

[0109] 1 Equipment case 5 Case body 6 First exterior member 7 Second exterior member 10 Protective Glass 11 Modules 12 Display device 13 Pulse measuring device 14 Back cover 15 Protrusion 16 Opening 17 Window materials 18 Sensor board 19 Pulse sensor 20 Photodetector 20a Light receiving part 21 Light-emitting element 22 Partition Wall 23 Resin board 24 Light blocking section 24a 1st light shielding part 24b 2nd light shielding part 25 Partition groove 25a Step 26 Partition recess 26a Boundary recess 27 Welded area 30 Primary molding die 30a 1st space part 31 Secondary molding die 31a 2nd space part 32 1st lower mold 32a Lower die recess 33 First upper mold 33a First upper die recess 33b 1st protrusion 33c 2nd protrusion 34 Second upper mold 34a Second upper die recess E1 1st light transmission area E2 2nd light transmission area S interval

Claims

1. A method for manufacturing a window member that is disposed in a position that contacts a human body in a wearable device that includes a pulse sensor including a light receiving element and a light emitting element, and that seals the wearable device, comprising: a first step of molding, using a primary molding die, a light-transmitting resin plate including a first region corresponding to the light-receiving element and a second region corresponding to the light-emitting element, and a partition groove provided between at least the first region and the second region; a second step of embedding a light-shielding portion in the partition groove using a secondary molding die, and fixing the light-shielding portion to the resin plate by a welding portion formed at an interface between the light-shielding portion inside the partition groove and the resin plate; Including, The primary molding die and the secondary molding die are a common die, In the second step, a part of the interface between the resin plate and the light-shielding part is welded by residual heat of the common mold of the primary molding mold to form the welded part. A method for manufacturing a window component.

2. the welding portion forms a distortion at the interface between the resin plate and the light-shielding portion inside the partition groove. The method for manufacturing the window member according to claim 1 .

3. The inner surface of the partition groove is inclined so that the groove width on the side of the resin plate that contacts the human body is larger than the groove width on the inner surface side of the resin plate. The method for manufacturing the window member according to claim 1 .

4. A step portion is provided inside the partition groove so that the groove width on the side of the resin plate that contacts the human body is larger than the groove width on the inner surface side of the resin plate. The method for manufacturing the window member according to claim 1 .

5. the melting point of the light-shielding portion is higher than the melting point of the resin plate; The method for manufacturing the window member according to claim 1 .

Images