CN111615352A - toilet seat - Google Patents

Abstract

A toilet seat device installed on a toilet, comprising: a main body fixed on the upper surface of the toilet; a toilet seat supported on the main body; and a reflective optical sensor installed on the toilet seat and having a light-emitting The light-emitting portion emits light from the surface of the toilet seat, and the light-receiving portion can receive the reflected light of the light emitted by the light-emitting portion. Therefore, the user of the toilet seat can be appropriately detected by the optical sensor provided on the toilet seat. In addition, by providing the optical sensor on the toilet seat instead of the main body, it is not necessary to design the shape of the toilet seat so as to expose the optical sensor.

Description

toilet seat

technical field

The present invention relates to a toilet device.

Background technique

Conventionally, as such toilet devices, there have been proposed: a main body fixed to the rear of the toilet upper surface, a toilet seat and a toilet lid that are rotatably supported on the main body and open and close, and a toilet seat and a toilet cover that are provided in the main body and can be used for a user (human body). A scheme of an optical sensor for detection (for example, refer to Patent Document 1). In this toilet seat device, by setting the shape of the rear end side in the closed state of the toilet seat and the toilet cover to a shape that extends rearward from the center part of the left and right end parts supported by the main body, regardless of whether the toilet seat, Whether the toilet lid is open or closed, the optical sensor is exposed. Thereby, regardless of whether the toilet seat or the toilet lid is in the open state or the closed state, it can be detected by the optical sensor.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent No. 4467866

In the toilet seat apparatus described above, the shape of the toilet seat or the like is fixed to the above-mentioned shape in order to be able to detect by the optical sensor, and therefore the degree of freedom in designing the toilet seat is limited. In such a toilet seat, due to changes in the consciousness of users in recent years, the demand for cleanliness and aesthetics has increased, so there is still room for improvement.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to enable proper detection by an optical sensor.

The present invention takes the following measures in order to achieve the above-mentioned main object.

The toilet seat device of the present invention is a toilet seat device installed on a toilet, and the main point is that it has a main body fixed to the upper surface of the toilet bowl; a toilet seat supported by the main body; and a reflection-type optical sensor The optical sensor is provided on the toilet seat, and has a light-emitting part and a light-receiving part, the light-emitting part emits light from the surface of the toilet seat, and the light-receiving part can receive the reflected light of the light emitted by the light-emitting part.

In the toilet seat of the present invention, the toilet seat supported by the main body is provided with a reflection-type optical sensor, the optical sensor has a light-emitting part and a light-receiving part, the light-emitting part emits light from the surface of the toilet seat, and the light-receiving part can receive the light-emitting part Because of the reflected light of the emitted light, it is possible to appropriately detect the user's entry and seating. In addition, the optical sensor may be a seating sensor that detects the user's seating on the toilet seat.

In the toilet seat of the present invention, the toilet seat may have: a seating portion for a user to sit on; and an extension portion extending from the seat so as to cover the main body A portion extends to the rear side of the main body, and the optical sensor is provided on the extending portion. In addition, the extending portion may have: an inclined portion smoothly connected to the seating portion and inclined at an upward slope toward the rear from the seating portion; and a flat portion The said optical sensor is provided in the said inclined part so that it may extend rearward in a substantially flat shape from the upper end of the said inclined part. Thereby, the optical sensor can be provided in a position suitable for detection without hindering the user's sitting, and the toilet seat can be formed into a shape covering the main body. Here, when the optical sensor is provided on the main body of the toilet seat and the toilet seat is shaped to expose the optical sensor, the gap between the toilet seat and the main body is also exposed, and dirt may accumulate in the gap. By making a toilet seat into a cover main body, since a clearance gap is prevented, the cleanliness of a toilet seat apparatus can be maintained. In addition, since the appearance of the toilet bowl can be improved without the gap being seen, the appearance of the toilet bowl can be improved.

In the toilet seat of the present invention according to the present aspect, the toilet seat may have a hinge portion provided to extend from the center side in the width direction from one of the toilet seat and the main body toward the other, and to be inserted into the toilet seat. The hinge part is provided in the recessed part of the other of the said toilet seat and the said main body, and is pivotally supported, and this hinge part rotatably supports the said toilet seat. In this way, since the hinge portion is fitted into the recessed portion and is pivotally supported, the toilet seat is stably supported with little rattling. Therefore, even when the weight of the toilet seat increases due to the shape of the toilet seat covering the main body, the opening and closing operation of the toilet seat can be stabilized. In addition, the toilet seat may be rotatably supported by the main body not only at the hinge part but also at both end sides in the width direction. In this way, the toilet seat is supported more stably by the both end sides and the center side in the width direction.

In the toilet seat of the present invention according to the present aspect, the hinge portion may be supported by a hollow shaft-shaped hinge shaft, and the wiring of the optical sensor may pass through the hinge shaft and be connected between the toilet seat and the toilet seat. are guided between the subjects. In this way, when the optical sensor is installed on the toilet seat, the wiring of the optical sensor can be easily routed.

In the toilet seat apparatus of the present invention according to this aspect, the toilet seat may be rotatably supported by the main body on both end sides in the width direction, and may be supported by the main body on the both end sides of the toilet seat. And among the parts where the hinge part is pivotally supported by the inner walls on both sides of the recessed part, at least two parts have dampers that apply rotational resistance to the toilet seat. In this way, abrupt opening and closing operations of the toilet seat can be appropriately suppressed.

In the toilet seat apparatus of the present invention according to this aspect, the toilet seat may be rotatably supported by the main body on both end sides in the width direction, and may be supported by the main body on the both end sides of the toilet seat. And among the parts where the hinge part is pivotally supported by the inner walls on both sides of the recessed part, there are three parts with dampers that apply rotational resistance to the toilet seat. In this way, abrupt opening and closing operations of the toilet seat can be appropriately suppressed.

In the toilet seat apparatus of the present invention, a toilet coverless structure in which a toilet cover covering the toilet seat is not provided may be employed. In this way, since the position of the optical sensor provided in the toilet seat is not limited by the toilet cover, the degree of freedom of the design of the toilet seat can be further improved. In addition, the cost of the toilet seat can be reduced by not providing the toilet cover.

Description of drawings

FIG. 1 is an external perspective view of the toilet bowl 1 to which the toilet seat apparatus 10 is attached.

FIG. 2 is a configuration diagram schematically showing the configuration of the toilet seat apparatus 10 .

FIG. 3 is an enlarged view showing a main part of the toilet seat 10. FIG.

FIG. 4 is an external perspective view of the toilet seat device 10 .

FIG. 5 is a cross-sectional view showing a part of the internal structure of the toilet seat 10 .

FIG. 6 is an external perspective view of the seat occupancy sensor 40 .

FIG. 7 is an exploded perspective view of the seat occupancy sensor 40 .

Detailed ways

Next, embodiments of the present invention will be described.

FIG. 1 is an external perspective view of the toilet 1 to which the toilet 10 is attached, FIG. 2 is a configuration diagram schematically showing the structure of the toilet 10, FIG. 3 is an enlarged view of a main part of the toilet 10, and FIG. 4 is a seat FIG. 5 is an external perspective view of the toilet device 10 , and FIG. 5 is a cross-sectional view showing a part of the internal structure of the toilet device 10 . In this embodiment, the left-right direction, the front-rear direction, and the up-down direction are as shown in each figure. In addition, although the structure arrange|positioned in the toilet seat apparatus 10 is shown by the broken line in FIG. 2, in FIG. 3, it shows by the thick solid line for convenience of illustration.

As shown in FIG. 1 , the toilet 1 is a Western-style toilet, and a toilet seat 10 is provided on the upper surface of the toilet 1 . The toilet seat 10 includes a toilet seat body 20 fixed to the rear of the upper surface of the toilet bowl 1 , and a toilet seat 30 pivotally supported by the toilet seat body 20 so as to be openable and closable. Moreover, the toilet seat 10 is provided with the seating sensor 40 which detects the sitting of a user (human body), and the state notification lamp 47 which shows the state of the toilet seat 10 in the toilet seat 30. As shown in FIG. The toilet seat 10 has a toilet-lid-less structure in which a toilet lid for covering the toilet seat 30 is not provided. When the toilet seat 30 is in the closed state (refer to FIG. 1 ) at the closed position, the surface serving as the upper surface is referred to as the front surface, and the surface serving as the lower surface is referred to as the rear surface. 2 to 4 show the open state in which the toilet seat 30 is at the open position. The toilet seat apparatus 10 is provided with the operation panel etc. which accept the user's operation in addition, but it abbreviate|omits illustration.

The toilet seat apparatus main body 20 has a plurality of (for example, two) local cleaning nozzles 22 for cleaning the user's local area, and a control device 24 for controlling the entire toilet seat apparatus 10 . The toilet seat main body 20 is formed in a substantially triangular prism shape, and the side surface 20a corresponding to the bottom surface of the triangular prism is a substantially right triangle shape, and the toilet seat main body 20 has an inclined surface 20b inclined downward with a downward slope toward the front. A substantially rectangular parallelepiped-shaped right support block 25 and a left support block 26 are provided on the inclined surface 20b for supporting the toilet seat 3 . The right side support block 25 and the left side support block 26 are arranged at predetermined intervals in the left-right direction (the width direction of the toilet seat 30 ), and a recessed portion 27 is formed therebetween. In addition, the right side support block 25 and the left side support block 26 have bilaterally symmetrical shapes with the recess 27 interposed therebetween, and the control device 24 is arranged in the left side support block 26 .

The toilet seat 30 has a seating portion 30a formed in a substantially annular shape and capable of allowing a user to sit, and an inclined portion 30b smoothly connected to the seating portion 30a and extending from the seating portion 30a is inclined with an upward slope toward the rear; and a flat portion 30c that extends rearward from the upper end of the inclined portion 30b in a substantially flat shape. That is, the toilet seat 30 is constituted by the seating portion 30a, the inclined portion 30b and the flat portion 30c extending rearward from the seating portion 30a. In addition, the toilet seat 30 is integrally molded by these seating part 30a, the inclined part 30b, and the flat part 30c, and the boundary of each part is not strictly defined. A toilet seat heater 38 is built in the toilet seat 30, and this toilet seat heater 38 heats the seating surface which is the surface of the seating part 30a. The inclined part 30b is inclined along the inclined surface 20b of the toilet seat main body 20, and the seat occupancy sensor 40 is provided in the center upper side of the left-right direction. The flat part 30c is provided with the state notification lamp 47 in the center of the left-right direction. The toilet seat 30 covers the toilet seat main body 20 from above with the inclined portion 30b and the flat portion 30c. In addition, the toilet seat 30 is formed with a recessed block receiving part 32 on the back side of the inclined part 30b and the flat part 30c to receive the right side support block 25 and the left side support block 26 of the toilet seat main body 20 in the closed state. Side wall portions 34 constituting side walls of the inclined portion 30b and the flat portion 30c are formed on both end sides in the left-right direction of the block housing portion 32 . A rotation shaft 34a is provided on the front end (lower end in FIG. 2 ) side of the side wall portion 34, and the toilet seat 30 is rotatably supported by the toilet seat main body 20 via the rotation shaft 34a.

In addition, the toilet seat 10 is provided with the center hinge 35 between the toilet seat main body 20 and the toilet seat 30 . The center hinge 35 is constituted by a rotating member 36 and a supporting member 37 . The turning member 36 is pivotally supported so as to be rotatable by being fitted between the inner side wall portion 25a of the right side support block 25 and the inner side wall portion 26a of the left side support block 26 constituting the inner wall of the recess 27 of the toilet seat main body 20 . The support member 37 is connected to the rotating member 36 and to the bottom of the block housing portion 32 . On the inner side wall portion 25a side of the right support block 25, a main damper 28 is provided, and the main damper 28 applies rotational resistance to the rotating member 36 connected to the rotating shaft 36a disposed on the right side in the rotating member 36. Since the rotating member 36 is connected to the toilet seat 30 via the support member 37, the main damper 28 applies rotational resistance to the toilet seat 30 at the rotation axis S1. Moreover, the hinge shaft 36b is provided in the rotation member 36, and this hinge shaft 36b penetrates from the rotation member 36 to the inner side wall part 26a of the left side support block 26. As shown in FIG. Although the detailed description is omitted, the hinge shaft 36b is inserted into a hinge cylinder (not shown) provided on the inner side wall portion 26a and the rotating member 36, respectively, and is connected to the hinge cylinder so as to be relatively rotatable about the rotation axis S2, and the hinge shaft 36b is formed. In the shape of a hollow shaft. The right side wall portion 25b of the right side support block 25 is provided with an auxiliary damper 29. The auxiliary damper 29 is connected to the rotation shaft 34a in the right side wall portion 34 of the toilet seat 30 and faces the toilet seat at the rotation axis S3. 30 Apply rotational resistance. Similarly, an auxiliary damper 29 is provided on the left side wall portion 26b of the left side support block 26, and the auxiliary damper 29 is connected to the rotation shaft 34a in the left side wall portion 34 of the toilet seat 30, and is connected to the rotation shaft S4 Rotation resistance is applied to the toilet seat 30 at the position. In addition, the auxiliary damper 29 is configured to apply a smaller rotational resistance than the main damper 28 . In addition, the rotation axes S1 to S4 are shown separately for convenience of description, but the rotation axes S1 to S4 are axes on the same axis.

As shown in FIGS. 6 and 7 , the seating sensor 4 includes a sensor body 41 , a cover 42 , a sensor cover 43 , and a gasket 44 . The sensor body 41 includes a light-emitting portion 40a that emits light such as infrared light, and a light-receiving portion 40b that receives reflected light of the light emitted by the light-emitting portion 40a. The cover 42 is disposed between the sensor main body 41 and the sensor cover 43 in order to prevent diffuse reflection of light within the sensor cover 43 . The sensor cover 43 is formed of a translucent material, and is attached to the sensor body 41 . The gasket 44 is used to prevent water from infiltrating the sensor body 41 side. The seat occupancy sensor 40 is mounted on the support member 37 provided on the center hinge 35 in a state in which the sensor cover 43 is attached to the sensor body 41 with the cover 42 sandwiched therebetween, and the gasket 44 is placed on the sensor cover 43 . Inside the sensor fixing member 37a (see FIG. 5 ). Then, when the support member 37 is attached to the rotating member 36 in a state where the seating sensor 40 is mounted on the sensor fixing member 37 a, the seating sensor 40 is accommodated in the sensor accommodating portion provided at the bottom of the block accommodating portion 32 of the toilet seat 30 . 33 (refer to FIG. 4 ) and assembled into the toilet seat 30 . Thereby, the sitting sensor 40 can detect whether or not the user is sitting on the toilet seat 30 . In addition, when the seat occupancy sensor 40 is incorporated into the toilet seat 30, the pad 44 is pressed against the back surface of the toilet seat 30 (inclined portion 30b), and water can be prevented from entering the sensor body 41 side. The wiring 45 (see FIG. 3 ) of the seat occupancy sensor 40 is routed so as to pass through the support member 37 , the rotating member 36 , the hinge shaft 36 b , and the left support block 26 . Device 24 is connected. That is, the wiring 45 is drawn between the toilet seat 30 and the toilet seat main body 20 through the hollow hinge shaft 36b.

The status notification lamp 47 is composed of a plurality of LEDs, and includes, for example, a power supply LED 47a that lights up in a state where power is supplied; a power saving LED 47b that lights up in a power saving mode that suppresses power consumption; The inspection LED47c which lights up in the state at the predetermined inspection time of the toilet seat apparatus 10. In addition, the power saving mode can be set by the above-mentioned operation panel or the like. The wiring 48 (refer to FIG. 3 ) of these state notification lamps 47 is connected to the control device 24 by passing through the hollow hinge shaft 36 b and being drawn like the wiring 45 of the seating sensor 40 . In addition, the wiring 39 (refer to FIG. 3 ) of the toilet seat heater 38 is also passed through the hollow hinge shaft 36 b and drawn around to be connected to the control device 24 .

Although not shown, the control device 24 is configured as a microcomputer centered on the CPU, and includes a ROM, a RAM, an input/output port, and the like in addition to the CPU. A detection signal from the seating sensor 40, an operation signal from an operation panel not shown, and the like are input to the control device 24 via an input port. The control device 24 outputs a drive signal to the local cleaning nozzle 22, a drive signal to the toilet seat heater 38, a signal to turn on each LED of the status notification lamp 47, and the like from the control device 24 through the output port.

In the toilet seat apparatus 10 having such a configuration, whether or not the user has sat on the toilet seat 30 is detected by the detection signal from the seating sensor 40 . When seating is detected by the detection signal from the seating sensor 40, the control device 24 outputs a drive signal to the toilet seat heater 38 based on the setting on the operation panel to heat the seating surface of the toilet seat 30, or perform partial cleaning of the nozzle 22. Prepare to spray wash water. In addition, when the seating of the user is detected by the seating sensor 40, the control device 24 sprays the washing water from the local washing nozzle 22 based on the operation of the operation panel. When it becomes impossible to detect seating based on the detection signal from the seating sensor 40, the control apparatus 24 completes the heating of the seating surface of the toilet seat 30 by the toilet seat heater 38. Since the toilet seat apparatus 10 is provided with the toilet seat 30 by the structure without the toilet cover, the seat occupancy sensor 40 can appropriately detect the seat occupancy when the toilet seat 30 is in the closed state. In addition, when the toilet seat 30 is in the open state, the seat occupancy sensor 40 can usually be set so as not to detect sitting, so that, for example, when a man urinates, it is possible to prevent the toilet device 10 from malfunctioning due to erroneous detection of the user.

In the toilet seat device 10 described above, since the seat occupancy sensor 40 is provided on the toilet seat 30, the user can be detected when the toilet seat 30 is in the closed position, and therefore it is not necessary to provide the seat occupancy sensor in the toilet seat device. As in the case of the main body 20, the toilet seat 30 is designed in such a shape that the seat occupancy sensor is exposed. In addition, since the seat occupancy sensor 40 is provided on the toilet seat 30 instead of the toilet seat apparatus main body 20, it is not necessary to design the toilet seat 30 as a seat occupancy sensor as in the case where the seat occupancy sensor 40 is provided in the toilet seat apparatus main body 20 40 exposed shapes. Therefore, the user can be appropriately detected by the seat occupancy sensor 40, and the degree of freedom of the design of the toilet seat 30 can be improved.

Moreover, the toilet seat 30 has the inclined part 30b and the flat part 30c extended rearward from the seating part 30a, and the toilet seat 30 covers the toilet seat apparatus main body 20 when it is a closed position. Therefore, the gap between the toilet seat 30 and the toilet seat main body 20 is prevented from being exposed, the toilet seat 10 can be kept clean, the appearance of the toilet seat 10 can be improved, and the appearance of the toilet seat 10 can be improved.

In addition, the toilet seat 30 is supported by the center hinge 35 on the center side in the left-right direction (width direction), and the center hinge 35 is fitted into the recess 27 to suppress rattling. Even when the weight of the toilet seat 30 is increased, the opening and closing operation of the toilet seat 30 can be stabilized. In addition, since the dampers (the main damper 28 and the auxiliary damper 29 ) are provided at the three locations of the rotation shafts S1 , S3 , and S4 , the sudden opening and closing operation of the toilet seat 30 can be appropriately suppressed.

In addition, the wiring 45 of the seat occupancy sensor 40 can be easily routed through the inside of the hinge shaft 36b. In addition, in order to properly detect the sitting of the user, the sitting sensor 40 is usually provided on the center side of the toilet seat 30 in the left-right direction. Therefore, by passing the wiring 45 through the hinge shaft 36b of the center hinge 35, wiring can be prevented. 45 exceeds the required length to enable efficient routing. In addition, since the wiring 39 of the toilet seat heater 38 and the wiring 48 of the state notification lamp 47 also pass through the hinge shaft 36b, each wiring can be routed in a concentrated manner.

In addition, since the toilet seat apparatus 10 has a structure without a toilet cover, the position of the seat occupancy sensor 40 is not limited by the toilet cover, and the degree of freedom of the design of the toilet seat 30 can be further improved. Moreover, the cost of the toilet seat apparatus 10 can be reduced by making it without a toilet cover.

In the above-described embodiment, a seating sensor that detects seating on the toilet seat 30 is exemplified as the optical sensor, but it is not limited to this, and may be a room entry detection sensor or the like that detects the user's entry into the room where the toilet seat 10 is installed. In addition, a seating sensor and a room entry detection sensor may be provided in the toilet seat 30 or the like, and a plurality of optical sensors may be provided in the toilet seat 30 .

In the embodiment, the toilet seat apparatus 10 is a structure without a toilet cover in which a toilet cover for covering the toilet seat 30 is not provided. In addition, although the toilet seat 30 is a structure which covers the toilet seat apparatus main body 20, it is not limited to this, and the toilet seat 30 may be a structure which exposes the toilet seat apparatus main body 20 without covering the toilet seat apparatus main body 20.

In the embodiment, dampers are provided at three locations among the four locations of the rotating shafts S1 to S4 , but the present invention is not limited to this, and dampers may be provided at at least two locations. Alternatively, the damper may be provided at only one location, but it is preferable to provide the damper at at least two locations in consideration of an increase in the weight of the toilet seat 30 when the toilet seat 30 covers the toilet seat main body 20 .

In the embodiment, two types of dampers (the main damper 28 and the auxiliary damper 29 ) having different magnitudes of the rotational resistance applied to the toilet seat 30 are provided, but the present invention is not limited to this, and the same magnitude of rotational resistance applied may be provided. For a plurality of dampers, for example, dampers (corresponding to main dampers) may be provided on both end sides, respectively.

In the embodiment, the wiring 45 of the seat occupancy sensor 40 is passed through the hollow hinge shaft 36b of the center hinge 35, that is, the wiring 45 is drawn from the center of the toilet seat 30 to the toilet seat main body 20, but not Limited to this, the wiring 45 may be routed to the toilet seat main body 20 from the left and right end portions of the toilet seat 30 . In addition, the heater wiring 39 of the toilet seat heater 38 and the lamp wiring 48 of the status notification lamp 47 are passed through the hinge shaft 36b. In addition, it is not limited to the configuration in which the heater 38 and the status notification lamp 47 are provided, and the heater 38, the status notification lamp 47 and the like may not be provided.

In the embodiment, the center hinge 35 is connected (fixed) to the toilet seat 30 and is pivotally supported on the recessed portion 27 provided in the toilet seat main body 20, but is not limited to this, and the center hinge 35 may be connected to the toilet seat main body 20 and pivotally supported in the recess provided in the toilet seat 30 . In addition, although the toilet seat 30 is supported on both end sides and the center side in the left-right direction, it is not limited to this, and may be supported on either of the both end sides and the center side. However, in consideration of an increase in the weight of the toilet seat 30 when the toilet seat 30 is provided to cover the toilet seat apparatus main body 20, it is preferable that the toilet seat 30 be supported on both end sides and the center side. In addition, the hinge portion may not be fitted into the recessed portion.

The correspondence between the main elements of the present embodiment and the main elements described in the column of the summary of the invention will be described. The toilet device 10 of the present embodiment corresponds to the "toilet device" of the present invention, the toilet device main body 20 corresponds to the "main body", the toilet seat 30 corresponds to the "toilet seat", and the seat occupancy sensor 40 corresponds to the "optical sensor". The seating portion 30a corresponds to a "seat portion", and the inclined portion 30b and the flat portion 30c correspond to an "extension portion". The recessed part 27 corresponds to a "recessed part", the center hinge 35 corresponds to a "hinge part", and the hinge shaft 36b corresponds to a "hinge shaft". The wiring 45 corresponds to "wiring of the optical sensor". The main damper 28 and the auxiliary damper 29 correspond to "dampers".

In addition, the correspondence between the main elements of the present embodiment and the main elements described in the column of the summary of the invention is to specifically describe an example of the mode of the present embodiment for implementing the invention described in the column of the summary of the invention, and therefore, it is not intended to describe the Elements of the invention are defined in the "Summary of the Invention" column. That is, the interpretation of the invention described in the "Summary of Invention" column should be based on the description in this column, and the present embodiment is only a specific example of the invention described in the "Summary of Invention" column.

As mentioned above, although the specific embodiment of this invention was described, this invention is not limited to such an embodiment, It cannot be overemphasized that it can implement in various forms in the range which does not deviate from the summary of this invention.

Industrial use possibility

The present invention can be utilized in the manufacturing industry of toilet seat apparatuses and the like.

Claims (9)

1. A toilet device, arranged on the toilet, having: a main body, the main body is fixed on the upper surface of the toilet; a toilet seat supported on the body; and A reflection-type optical sensor provided on the toilet seat and having a light-emitting portion that emits light from a surface of the toilet seat and a light-receiving portion that can receive reflected light of the light emitted by the light-emitting portion . 2. The toilet device of claim 1, wherein: The toilet seat has: a seating part on which a user sits; and an extension part extending from the seating part to the rear side of the main body so as to cover the main body, The optical sensor is provided on the extension portion. 3. The toilet device of claim 2, wherein: The extension has: an inclined portion that is smoothly connected to the seating portion and that slopes upward from the seating portion toward the rear; and a flat portion extending rearward from the upper end of the inclined portion in a substantially flat shape, The optical sensor is provided on the inclined portion. 4. The toilet device according to claim 2 or 3, wherein, It has a hinge portion which is provided from one of the toilet seat and the main body toward the other, extends from the center side in the width direction, and is fitted through a recessed portion provided in the other of the toilet seat and the main body It is pivotally supported inside, and this hinge part rotatably supports the said toilet seat. 5. The toilet of claim 4, wherein: The hinge portion is supported by a hollow shaft-shaped hinge shaft, The wiring of the optical sensor is routed between the toilet seat and the main body through the inside of the hinge shaft. 6. The toilet set according to claim 4 or 5, wherein, The toilet seat is rotatably supported by the main body at both end sides in the width direction, Among the parts of the toilet seat where the toilet seat is supported by the main body at the both end sides and the parts where the hinge part is pivotally supported by the inner walls on both sides of the recessed part, at least two parts have a portion facing the A damper that applies rotational resistance to the toilet seat. 7. The toilet device according to claim 4 or 5, wherein, The toilet seat is rotatably supported by the main body at both end sides in the width direction, Among the parts where the toilet seat is supported by the main body at the both end sides and the parts where the hinge part is pivotally supported by the inner walls on both sides of the recessed part, there are three parts facing the toilet seat. A damper that applies rotational resistance. 8. The toilet seat according to any one of claims 1 to 7, wherein, This toilet seat is a no-cover structure in which a toilet cover covering the toilet seat is not provided. 9. The toilet seat of any one of claims 1 to 8, wherein: The optical sensor is a seating sensor that detects a user's seating on the toilet seat.

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