CN115755562A

CN115755562A - Alarm clock adopting angle displacement sensor to set alarm time

Info

Publication number: CN115755562A
Application number: CN202211579683.1A
Authority: CN
Inventors: 池汉军; 池睿平; 赵建飞; 游亮
Original assignee: Hangzhou Jingcheng Sanhe Timer Industry Co ltd
Current assignee: Hangzhou Jingcheng Sanhe Timer Industry Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-03-07
Also published as: WO2024119595A1

Abstract

The present invention relates to a timepiece. The alarm clock has the advantages that the alarm time is clearly and definitely set, and a user can use the alarm clock quickly and conveniently and easily identify the alarm time. The technical scheme is that an alarm clock adopting an angle displacement sensor to set alarm time is characterized in that: the alarm clock is characterized in that an angle displacement sensing assembly which is electrically communicated with the main control circuit to set alarm time is further arranged in the shell, and an alarm time display structure matched with the angle displacement sensing assembly is arranged on the dial disc.

Description

Alarm clock adopting angle displacement sensor to set alarm time

Technical Field

The invention relates to a timing device, in particular to an alarm clock adopting an angle displacement sensor to set alarm time.

Background

The alarm clock is a necessary timing appliance for every family; and the alarm clocks on the market are various in variety and have various characteristics. For example, CN2643359Y discloses a pointer type quartz electronic time-telling alarm clock which can synchronize voice time-telling with pointer time-walking, and has functions of pressing time-telling and pressing halving; the automatic quartz alarm clock and the movement thereof disclosed in CN2420666Y have a timing alarm-stopping function. The alarm time of the alarm clock is mostly determined by adopting a pointer type or a button type; in the pointer type, a user usually rotates the timing pointer for a plurality of circles to align the required time scales, and the timing pointer has a tiny structure (the structure of the fourth pointer except the hour hand, the minute hand and the second hand is generally one fourth to one fifth of the rest of the pointers), so the operation is troublesome; the alarm clock is of a key type, and the alarm clock can be set only by displaying the alarm clock on a display screen and frequently repeating the drum stamping key for a plurality of times by a user; moreover, the user who uses the function occasionally has no idea about whether the alarm time is correctly set.

Disclosure of Invention

The invention aims to overcome the defects of the background technology and provide the alarm clock adopting the angular displacement sensor to set the alarm time, and the alarm clock has the characteristics of clear and definite alarm time setting, quick and convenient use by a user and easy identification.

The technical scheme provided by the invention is as follows:

an alarm clock adopting an angular displacement sensor to set alarm time comprises a shell, a clock circuit, an alarm circuit and a display screen, wherein the shell is provided with a battery and a main control circuit; the method is characterized in that:

the alarm clock is characterized in that an angle displacement sensing assembly which is electrically communicated with the main control circuit to set alarm time is further arranged in the shell, and an alarm time display structure matched with the angle displacement sensing assembly is arranged on the dial disc.

The angle displacement sensing assembly is arranged on the rear side of the dial and comprises a sensing circuit board which is fixed on the front shell and is arranged in parallel with the dial and an angle circuit board which is arranged in parallel with the sensing circuit board and is driven by the knob, and the sensing circuit board is matched with the angle circuit board in a sensing mode to output signals of the main control circuit.

The sensing circuit board is fixed on the front end face of the alarm clock fixing frame, and the angle circuit board is driven by the knob to be in sensing fit with the sensing circuit board; the knob shaft which is inserted and embedded with the knob is rotatably positioned at the center of the front side end face of the alarm clock fixing frame, and the connecting plate which is coaxially arranged on the knob shaft is rotatably positioned on the front side end face of the alarm clock fixing frame through the matched ball retaining structure, so that the angle circuit board which is coaxially arranged on the back face of the connecting plate and the induction circuit board are kept parallel to each other.

The ball holding structure includes: the ball grooves are arranged on the front side and the back side of the connecting plate and are regularly arranged, and a plurality of balls are arranged in each ball groove; the axes of all the balls arranged on the front surface or the back surface of the connecting plate are respectively positioned on the same circumferential surface, and the circumferential surface and the axis of the knob shaft are coaxially arranged.

The alarm time display structure comprises a pointer or color block display structure; the color lump display structure comprises an access seam arranged in the center of the dial and an indicator sheet which is driven by a knob to penetrate through the access seam and rotate between the back of the dial and the surface of the dial.

The indicating sheet is arranged in parallel to the dial surface and penetrates through the access seam to rotate from the dial back to the dial surface so as to represent the corresponding alarm time through the scales on the dial surface which are shielded.

The access seam extends from the central hole of the dial to the 0-scale part of the dial; the sheet-shaped dial face of the indicating sheet is arranged in parallel with the dial face and is also provided with a straight groove corresponding to the gap, the straight groove extends from the center of the indicating sheet to the edge of the indicating sheet along the radius direction and divides the indicating sheet into a starting end and a tail end.

The main control circuit is respectively and electrically connected with the first display circuit, the second display circuit, the alarm circuit and the clock circuit, the first display circuit is respectively and electrically connected with the angle sensing circuit, the alarm circuit, the display screen backlight circuit and the display screen, and the second display circuit is also electrically connected with the display screen; the power supply circuit respectively supplies power to the main control circuit, the first display circuit, the second display circuit and the angle sensing circuit; the main control circuit and the first display circuit are respectively provided with a key.

The invention has the beneficial effects that:

the alarm clock adopts the angle displacement sensing assembly to set the alarm clock time, and the alarm clock time can be directly set only by rotating once, so that the alarm clock is simple, quick and convenient, and the timing accuracy can be ensured; the alarm time is represented by the color blocks corresponding to the time scales, the alarm time is displayed clearly, the identification is visual and not easy to make mistakes, and a brand new experience feeling is provided for consumers.

Drawings

Fig. 1 is a schematic view of a main view structure (displaying alarm time by using a color block display structure) in embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of the right-side structure of fig. 1.

Fig. 3 is a schematic view of a main view structure (displaying alarm time by using a pointer) in embodiment 2 of the present invention.

Fig. 4 is a cross-sectional enlarged structural view of fig. 2.

Fig. 5 is an exploded view of example 1 of the present invention.

Fig. 6 is a front view of the connection plate of fig. 2.

Fig. 7 is a rear view of the connection plate of fig. 2.

Fig. 8 is a schematic view of the connection relationship between the connection plate and the knob in fig. 2.

FIG. 9 is a schematic diagram showing the fitting relationship between the indicator piece and the dial in a color block display structure.

Fig. 10 is an enlarged schematic view of a printed circuit board of the signal pickup portion of the induction wiring board in embodiment 1.

Fig. 11 is a schematic view of an enlarged structure of a printed circuit of the signal collecting section of the angle wiring board in embodiment 1.

Fig. 12 is a circuit schematic diagram of embodiment 1 of the present invention.

Fig. 13 is a circuit configuration diagram of embodiment 1 of the present invention.

The labels in the figure are:

1. a knob; 1.1, a knob shaft; 2. a transparent lens; 3. a dial scale; 3.1, entering and exiting the seam; 4. an indicator sheet; 4.1, straight grooves; 5. a front housing; 6. a display screen; 7. a display screen support; 8. a connecting plate; 8.1, rolling balls; 8.2, a ball groove; 9. an angle circuit board; 10. an induction circuit board; 11. an alarm clock fixing frame; 12. a main circuit board; 13. pressing a key; 14. an alarm element; 15. a rear housing; 16. a magnetic block; 17. a battery; 19. and a USB interface.

Detailed Description

The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

The alarm clock adopting the angular displacement sensor to set the alarm time as shown in fig. 1 comprises a casing (formed by connecting a front casing 5 and a rear casing 15) provided with a battery 17 and a main control circuit, a clock circuit and an alarm circuit (wherein, the alarm element is preferably a buzzer) which are fixed at the rear part of the casing and are electrically connected with the main control circuit, a dial 3 positioned at the front part of the casing, and a display screen (which displays the actual time in real time) which is positioned at the front part of the casing and is electrically connected with the main control circuit; the dial front is also closed with a transparent lens 2 to keep the inside of the housing clean.

The structure is similar to the existing quartz movement alarm clock.

The improvement of the invention is that: an angle displacement sensing assembly is further arranged in the shell, an angle sensing circuit in the angle displacement sensing assembly is electrically connected with the main control circuit through a first display circuit and used for setting alarm time (namely alarm clock alarm time), and an alarm time display symbol corresponding to the alarm time in opposite direction is arranged on the dial disc.

As can be seen from fig. 4: the angle displacement sensing assembly is positioned at the rear side of the dial 3 and comprises an induction circuit board 10 and an angle circuit board 9 which is in induction fit with the induction circuit board; the induction circuit board is provided with an angle sensing chip U4 and a signal acquisition part, and is fixed on the front end face of the alarm clock fixing frame, and the center hole of the induction circuit board is coaxial with the dial. The angle circuit board is fixed on the back surface (the surface opposite to the induction circuit board) of the connecting plate 8 and can be driven by the connecting plate to rotate around the axis of the dial; in the rotating process, the signal acquisition part of the angle circuit board is in capacitive sensing matching with the signal acquisition part of the sensing circuit board, so that when the angle circuit board rotates by an angle, the capacitive signal acquired by sensing of the signal acquisition part of the sensing circuit board generates a voltage variable through the angle sensing chip U4, and the voltage variable is converted into an angle signal; after the rotation is stopped, the finally generated angle signal is output to the angle sensing chip U4 as a corresponding alarm setting signal (eight signals including CL1 to CL8 are respectively output through eight contacts), and the U4 converts the angle signal into alarm clock alarm time and sets the alarm clock alarm time as the alarm clock alarm time (when the time of the alarm clock is coincident with the set alarm clock time, the main control circuit starts an alarm element to make a sound). Obviously, the structure and the working principle of the angular displacement sensing assembly are the same as those of a conventional angular displacement sensor, and therefore, the detailed description is omitted.

The angle circuit board rotates for a circle 360 degrees, which is exactly 12 hours of the clock face scale; the angle is therefore exactly matched to the transition of the time scale: rotating 90 degrees to obtain 3 o 'clock of time scale, and rotating 180 degrees to obtain 6 o' clock of time scale; by parity of analogy

See fig. 6-8; the connecting plate structure is similar to the sliding plate disclosed in CN217932436U, and is a disk-shaped plate with a knob shaft 1.1 fixed at the axial center, and two ends of the knob shaft respectively extend out from the center of the connecting plate to the end faces at two sides, one end of the knob shaft is rotatably fitted with the front end face of the alarm clock fixing frame (as can be seen from fig. 4, the end can be rotatably fitted with a protruding part at the center of the front end face of the alarm clock fixing frame), and the other end is a knob handle capable of being fitted with the knob. The connecting plate is also the same as the sliding sheet, and the rotation stability of the connecting plate is kept through the matched ball retaining structure; the ball retaining structure includes: a plurality of ball grooves 8.2 (four ball grooves are arranged on each end face in fig. 6 and 7) which are arranged on the front and back surfaces of the connecting plate in a regular way, and a plurality of balls 8.1 (three balls are arranged in fig. 6 and 7) are arranged in each ball groove; the axes of all the balls arranged on the front surface or the back surface of the connecting plate are respectively positioned on the same circumferential surface, and the circumferential surface and the axis of the knob shaft are coaxially arranged. After the balls are installed, the balls can be exposed out of the ball grooves, so that the balls in the ball grooves on the front surface of the connecting plate are in abutting fit with a matching surface 5.1 (namely one surface of the contraction edge part facing the connecting plate) of the front shell; and the ball in the ball groove on the back of the connecting plate is propped against the front surface of the outer edge part of the induction circuit board for rolling fit (the circuit on the induction circuit board is annular, the diameter of the circuit is smaller than the diameter of the circumference of the ball groove, and the circuit is just avoided during rolling fit).

The alarm timing time display structure comprises a pointer or color block display structure. When the pointer is adopted, the pointer is only required to be fixed on the knob shaft (see figure 3).

The color block display structure is similar to that disclosed in CN214586412U, and comprises an inlet and outlet seam 3.1 arranged on the dial plate along the radius direction, and an indicator plate 4 driven by a knob shaft and moving between the back surface of the dial plate and the surface of the dial plate through the inlet and outlet seam.

The access seam extends from the central hole of the dial to the 0-scale part of the dial; the sheet-shaped and circular dial surface of the indicating sheet is arranged in parallel with the dial surface and is also provided with a straight groove 4.1 corresponding to the gap, the straight groove extends from the center of the indicating sheet to the edge of the indicating sheet along the radius direction and divides the indicating sheet into a starting end and a tail end; the tail end of the indicating sheet (the tail end is arranged at the right side of the straight groove in fig. 5) can be inserted into the back of the dial from the access seam, and the starting end part can be shielded on the surface of the dial, so that the alarm time can be represented by the scale pointed by the starting end. When the alarm clock is used, the starting end of the indicating sheet is driven by the knob shaft and rotates to the surface of the dial from the rear side of the dial through the access seam, and a certain scale on the dial pointed by the starting end is the set alarm time; for example (as shown in fig. 9), the beginning edge of the indicator piece is aligned with the 3-point scale, indicating that the alarm time is 3 o' clock.

Referring to fig. 12: in this embodiment, a main control circuit including a main control chip U1, an alarm circuit, a clock circuit, a second display circuit including a second display chip U3, and a power supply circuit with a battery are disposed on a main circuit board 12, which is mounted in a positioning seat of a rear case; a first display circuit, a display screen backlight circuit and an alarm clock circuit which comprise a display first display chip U2 are arranged on the display screen circuit board arranged on the display screen support 7 in a matching way; the induction circuit board is provided with an angle sensing circuit comprising an angle sensing chip U4 (the first display circuit, the second display circuit, the angle sensing circuit and the main control circuit can also be integrated on the main circuit board and then are installed on the connecting board). The circuit connection relation is as follows: the main control circuit is respectively and electrically connected with the first display circuit, the second display circuit, the alarm circuit and the clock circuit, the first display circuit is respectively and electrically connected with the angle sensing circuit, the alarm clock circuit, the display screen backlight circuit and the display screen (the angle sensing circuit, the alarm clock circuit, the display screen backlight circuit and the display screen are respectively and electrically connected with the main control circuit through the first display circuit), and the second display circuit is also electrically connected with the display screen; the power supply circuit respectively supplies power to the main control circuit, the first display circuit, the second display circuit and the angle sensing circuit; the main control circuit is also electrically connected with a key S1, and the first display circuit is also electrically connected with a key S2, a key S3 and a display screen backlight circuit.

The circuit principle is described below (see fig. 13).

1. A main control circuit provided with a main control chip U1 and used for taking charge of clock running and alarm;

2. the first display circuit is provided with a first display chip U2, the second display circuit is provided with a second display chip U3, and the second display circuit is responsible for controlling the LCD display screen through the display screen backlight circuit so as to display the time between clock inches and the set time of the alarm clock;

3. and an angle sensing circuit provided with an angle sensing chip U4 is used for converting a capacitance variable parameter between the received angle circuit board signal acquisition part and the induction circuit board signal acquisition part into a time value from an angle value.

4. And the alarm clock circuit is responsible for setting the alarm time.

5. And the clock circuit is responsible for ensuring the clock time-travelling precision and the clock correction.

Relation of circuit connection

U1 chip: the pin 4 (through the capacitor C1) is the positive power supply access, the pin 12 is the negative power supply access, and the capacitor C1 is connected in parallel to the power supply for filtering, anti-interference and stabilizing; the pin 5 and the pin 6 are connected with a clock circuit SZ (composed of an oscillator Y1 and capacitors C2 and C3 to ensure the clock timing precision); the 14# pin (terminal SI) is connected with the 8# pin of the chip U2 through an anti-interference resistor R8, and is connected with the 2# pin of the chip U3 through an anti-interference resistor R16 to perform signal transmission; the No. 7 pin is connected with the No. 16 pin of the chip U2 through an anti-interference resistor R3 to carry out signal transmission; the key S1 (namely the key 13) outputs a high level to a No. 1 pin of the chip U1 through the anti-interference resistor R1, and is used for turning off the alarm sound of the alarm clock; the No. 8 pin is connected with a working power supply VDD through a resistor R2, a triode Q2 and a diode Q3 in sequence, and two connection wires of the alarm component 14 are respectively connected with two ends of the diode Q3.

U2 chip: the pin 2 outputs high level through a resistor R6, and the high level is amplified through a triode Q1 signal and output to an LED lamp D1 (D1 is a backlight source of an LCD display screen), so that the LED lamp is controlled to emit light; the resistor R9 is used for adjusting the brightness of the LED; and pull down resistor R7 for clock mode selection (12 hours on, 24 hours off); the pin 5 is connected with a positive power supply through a capacitor C7, the pin 12 is connected with a negative power supply, and the power supply is connected with a capacitor C7 in parallel for filtering; the 9 SEG pins are used as 9 pins of the joint end J4 of the display screen for connecting the output of the display pen segment, wherein the SEG1 is correspondingly connected with the No. 5 pin of the joint end J4 of the display screen (LCD display screen), and the SEG2 is correspondingly connected with the No. 6 pin-SEG 9 of the joint end J4 of the display screen and correspondingly connected with the No. 13 pin of the joint end J4 of the display screen. In addition, in the backlight circuit of the display screen, the key S2 is also connected with a pin 3# of the U2 and a pin 5# of a joint end J4 of the LCD display screen through a resistor R10, and the key S3 is also connected with a pin 4# of the U2 and a pin 6# of a joint end J4 of the LCD display screen through a resistor R11, so that the LCD display screen is connected with a power supply; the No. 16 pin is connected with the No. 7 pin of the chip U1 through an anti-interference resistor R3For correcting the clock and, when the actual time comes to coincide with the time of the alarm set, signalling the buzzer to sound the alarm _。

U3 chip: the pin 1 is connected with a positive power supply, the pin 8 is connected with a negative power supply, and a capacitor C5 is connected with the power supply in parallel for filtering, anti-interference and stabilizing; the pin No. 2 is connected with the pin No. 14 of the U1 and the pin No. 8 of the U2 through a resistor R16 and serves as a signal transmission end; the 4 connecting ends (COM 1 to COM 4) formed by connecting the pins 3 to 7 in parallel respectively through resistors R17 to R24 are used as a backlight circuit of the display screen, and the pins 1 to 4 (a pin 3R 24 and a pin 4R 23 which are connected in parallel as a screen connecting end J4 of an output end COM4, a pin 5R 21 and a pin 4R 22 which are connected in parallel as a screen connecting end J3 of the output end COM3, a pin 5R 20 and a pin 6R 19 which are connected in parallel as a screen connecting end J3 of an output end COM2, a pin 7R 17 and a pin 6R 18 which are connected in parallel as a screen connecting end J3 of the output end COM 1) are connected in parallel, wherein the COM1 is correspondingly connected with the pin 4, and the COM4 is correspondingly connected with the pin 4) during connection.

U4 chip: the pin 2 is the positive pole and the pin 15 is the access of the negative pole power supply, and a capacitor C4 is connected in parallel with the power supply to filter and stabilize the anti-interference function; the CL 1-CL 8 pins are used for collecting and inputting capacitance signals and are sequentially connected with 8 pins (1 # pin to 8# pin; the 1# pin to 8# pin is omitted in the figure 9) of the JDB of the induction circuit board signal collecting part one by one; the 13# pin is a (CHECKIN pin), a pull-up resistor R15 and a pull-down resistor R14 play a role in sensing voltage (changing along with the change of the capacitance), and capacitance variables of CL 1-CL 8 pins are subjected to digital-to-analog conversion through a chip U4, so that a time value converted from an angle value is calculated in real time; pin 7 transmits the signal to pin 15 of the chip U2 through the anti-interference resistor R12, and pin 12 transmits the signal to pin 14 of the chip U2 through the anti-interference resistor R13. The clock circuit NZDL (conventional universal circuit) is connected in series between the pin # 14 and the pin # 15 of the U2 chip and the pin # 7 and the pin # 12 of the U4 chip.

Angle sensing principle: the U4 chip is installed on the stationary induction circuit board and keeps coaxial and parallel to the angle circuit board, and the angle circuit board can rotate and keeps a certain clearance with the induction circuit board, thereby utilizing the change of capacitance between the two to generate different angle signals. The printed circuit of the angle wiring board signal acquisition part (see fig. 11) is divided into 12 equal sectorial cells, and each cell corresponds to an angle of 30 ° (1 to 12 as shown in fig. 11). In the printed circuit of the signal acquisition part of the induction circuit board (see fig. 11), a circular ring-shaped area a is divided into 12 large areas (A1-a 12 shown in fig. 10) to correspond to 12 fan-shaped small areas of the angle circuit board, wherein each large area is divided into 8 small fan-shaped areas, and the corresponding angle of each small fan-shaped area is 30/8 degrees; the B area of the circular ring in the angle circuit board is connected to GND (ground) to prevent the capacitance from being interfered by surrounding signals when the capacitance is changed; the circular C area (the smallest ring) of the induction circuit board is connected to a 13# pin (CHECKIN pin) of the U4 chip; when the circuit board is rotated, the capacitance value variable is generated between a large interval and a small interval of the induction circuit board, the capacitance value variable is converted into a voltage variable through a pull-up resistor R15 and a pull-down resistor R14 which are connected with a 13# pin (CHECKIN pin) of a U4 chip, the voltage variable is converted into an angle value through digital-to-analog conversion of the chip U4, and the angle value is converted into a time value in real time, namely the alarm clock setting is completed; meanwhile, the No. 7 pin of the chip U4 transmits the signal to the No. 15 pin of the chip U2 through the anti-interference resistor R12, the No. 12 pin of the chip U4 transmits the signal to the No. 14 pin of the chip U2 through the anti-interference resistor R13, and the chip U2 and the chip U3 display the time set by the corresponding alarm clock on the LCD screen. When the time runs to the set alarm time (when the set alarm time is consistent with the time of the clock), the chip U2 transmits a signal to the No. 7 pin of the chip U1 through the No. 16 pin and the anti-interference resistor R3, and the chip U1 outputs a high level through the No. 8 pin, amplifies the signal through the triode Q2 and outputs the signal to the alarm element (buzzer) for alarming; when the buzzer gives an alarm, a high-level signal can be input into the pin 1# of the chip U1 through the key 1, and the buzzer can be temporarily closed.

Further: the magnetic block 16 on the back of the casing is used for fixing the alarm clock on any iron object; a USB interface 19 for charging is provided on the housing.

The use mode of the invention is as follows: and starting the clock by starting the keys S2 and S3, and displaying the clock on the display screen. The alarm time can be set by rotating the knob; when the knob rotates, the indicating sheet is driven to rotate on the dial; after the alarm time is set, starting a key S1, starting the alarm clock, displaying real-time on a display screen, wherein the scale corresponding to the indication sheet is the set alarm time; when the set time is up, the timer sends out an alarm sound to prompt and remind the user.

Claims

1. An alarm clock adopting an angular displacement sensor to set alarm time comprises a shell provided with a battery (17) and a main control circuit, a clock circuit and an alarm circuit which are fixed in the shell and electrically communicated with the main control circuit, and a display screen (6) which is arranged on a dial (3) at the front part of the shell and electrically communicated with the main control circuit; the method is characterized in that:

2. An alarm clock using an angular displacement sensor to set alarm time according to claim 1, wherein: the angle displacement sensing assembly is arranged on the rear side of the dial and comprises a sensing circuit board (10) which is fixed on the front shell (5) and arranged in parallel with the dial and an angle circuit board (9) which is arranged in parallel with the sensing circuit board and driven by the knob (1), wherein the sensing circuit board and the angle circuit board are in sensing fit with each other and are used for outputting signals by the main control circuit.

3. An alarm clock using an angular displacement sensor to set alarm time according to claim 2, wherein: the induction circuit board is fixed on the front end face of the alarm clock fixing frame (11), and the angle circuit board is driven by the knob to be in induction fit with the induction circuit board; the knob shaft (1.1) which is inserted and matched with the knob is rotatably positioned at the central part of the end face of the front side of the alarm clock fixing frame, and the connecting plate (8) which is coaxially arranged on the knob shaft is rotatably positioned at the front side of the induction circuit board through the matched ball retaining structure, so that the angle circuit board which is coaxially arranged on the back of the connecting plate is kept parallel to the induction circuit board.

4. An alarm clock using angular displacement sensor to set alarm time according to claim 3, wherein: the ball retaining structure includes: a plurality of ball grooves (8.2) which are arranged on the front side and the back side of the connecting plate and are regularly arranged, and a plurality of balls (8.1) are arranged in each ball groove; the axes of all the balls arranged on the front or the back of the connecting plate are respectively positioned on the same circumferential surface, and the circumferential surface and the axis of the knob shaft are coaxially arranged.

5. An alarm clock using angular displacement sensor to set alarm time according to claim 4, wherein: the alarm time display structure comprises a pointer or color block display structure; the color block display structure comprises an access seam (3.1) arranged at the center of the dial and an indicator plate (4) which is driven by a knob to penetrate through the access seam to rotate between the back surface of the dial and the surface of the dial.

6. An alarm clock using an angular displacement sensor to set alarm time according to claim 5, wherein: the indicating sheet is arranged in parallel to the dial surface and penetrates through the access seam to rotate from the dial back to the dial surface so as to represent the corresponding alarm time through the scales on the dial surface which are shielded.

7. An alarm clock using an angular displacement sensor to set alarm time according to claim 6, wherein: the inlet and outlet seam extends from the center hole of the dial to the 0 scale part of the dial; the sheet-shaped dial face of the indicating sheet is arranged in parallel with the dial face and is also provided with a straight groove (4.1) corresponding to the gap, the straight groove extends from the center of the indicating sheet to the edge of the indicating sheet along the radius direction and divides the indicating sheet into a starting end and a tail end.

8. An alarm clock using an angular displacement sensor to set alarm time according to claim 7, wherein: the main control circuit is respectively and electrically connected with the first display circuit, the second display circuit, the alarm circuit and the clock circuit, the first display circuit is respectively and electrically connected with the angle sensing circuit, the alarm circuit, the display screen backlight circuit and the display screen, and the second display circuit is also electrically connected with the display screen; the power supply circuit is used for supplying power to the main control circuit, the first display circuit, the second display circuit and the angle sensing circuit respectively; the main control circuit and the first display circuit are also electrically connected with the key circuit respectively.