Please select the most similar patent number from A, B, C and D. Which number is?
An intelligent mirror, comprising a support portion (10), a mirror surface portion (20) movably connected to the support portion (10), a driving portion (30), and a sensing portion. The driving portion (30) is transmittingly connected to the mirror surface portion (20) to drive the mirror surface portion (20) to move with respect to the support portion (10). The sensing portion obtains the height information of a user in front of the mirror surface portion (20) and the distance information of the user away from the support portion (10), and obtains the movement data of the mirror surface portion (20) according to the height information and the distance information. The driving portion (30) drives, according to the movement data, the mirror surface portion (20) to move so that the whole body of the user is displayed in the mirror surface portion (20). By use of the intelligent mirror, there is no need to adjust the elevation angle, thereby improving use comfort and experience.
A: Disclosed is an object placing part device, which is connected to a support portion (20). The object placing part device comprises an object placing part (10) capable of moving relative to the support portion (20), a driving mechanism (40) and a sensor unit provided on the object placing part (10) and used for determining whether an object is placed on the object placing part (10), wherein the driving mechanism (40) is in transmission connection with the object placing part (10) to control the object placing part (10) to at least move between a use state and a non-use state; the sensor unit is in signal connection with the driving mechanism (40); and the object placing part (10) is in the use state, and the sensor unit controls the driving mechanism (40) to keep the object placing part (10) in the use state when determining that an object is placed on the object placing part (10). The invention has the advantages of smooth unfolding and folding, being labor saving and being convenient, and the support is stable and reliable.
B: A multifunctional balance chair, comprising a supporting portion (10), a seat portion (20), and a knee cushion portion (30). The seat portion (20) is movably connected to the supporting portion (10), and an included angle between the seat portion (20) and the horizontal plane can be controlled by means of relative movement of the seat portion (20). The knee cushion portion (30) is movably connected to the seat portion (20), and is connected to the supporting portion (10) by means of a connecting mechanism; linkage is formed by movement of the seat portion (20) and movement of the knee cushion portion (30). When the knee cushion portion (30) is aligned to the position of the seat portion (20), the multifunctional balance chair is in the state of a seating chair, i.e., forming a common stool on the market, a seat of the stool comprising the seat portion (20) and the knee cushion portion (30), such that the area of the seat is increased, and leg placement of a user is protected from interference by a knee cushion. When the knee cushion portion (30) is at a position for forming a balance chair knee cushion, the seat portion (20) of the balance chair is inclined with the inclined surface facing forwards and the knee cushion portion (30) is inclined with the inclined surface facing backwards, and when a user sits on the seat portion (20) with two legs kneeling on the knee cushion portion (30), the balance chair in the state of a balance chair, i.e., forming a common balance chair on the market.
C: A smart mirror (100) and a control method thereof. The smart mirror (100) comprises a back cover (10); a display module (20) disposed at the back cover (10) and used to display preconfigured information; an illumination module (30) at the back cover (10) and used to emit illumination light; a distance sensing module (40) disposed at the back cover (10) and used to sense a distance to a user located at a target area; a control module (50) disposed at the back cover (10) and electrically connected to all the display module (20), the illumination module (30), and the distance sensing module (40), so as to select, according to the distance sensed by the distance sensing module (40), one of the display module (20) and the illumination module (30) to activate the same; and a display mirror (60) disposed at the back cover (10) and covering only the display module (20). The technical solution employs the distance sensing module (40) to sense a distance to a user located in a target area, and determines, according to the distance, a need of the user, to select one from the display module (20) and the illumination module (30) and activate the same, satisfying an information display requirement, being adaptive to mirror requirements in various ambient illumination, and enhancing user experience.
D: An autoregulatory bed, comprising: an electronically controlled part (10), a mechanically regulated part (20), and a support part (30). The electronically controlled part (10) is connected to the mechanically regulated part (20); the mechanically regulated part (20) is slidably connected to the support part (30); the support part (30) is partitioned according to a specified amounts; the partitions respectively correspond to specified parts of a human body; the electronically controlled part (10) is used to regulate the heights of specified partitions of the support part (30).
Answer: C