TWI502319B - Electronic apparatus having lifting device and method for lifting base thereof - Google Patents

Description

Lifting method for electronic device with lifting device and base thereof

The present invention relates to a control technology for a casing member, and more particularly to a method for lifting an electronic device and its base.

In order to meet the requirements of high speed, high efficiency, light weight and shortness of today's electronic products, various portable electronic devices have become mainstream, and with the advancement of the electronics industry, the exterior design of portable electronic devices has gradually become The key factors for products to enter the market. As far as notebook computers are concerned, the more aesthetically pleasing the design and the more convenient they are, the more likely they are to become the mainstream choice in the consumer market.

In the design of the notebook computer, in order to prevent foreign matter from entering the slot (such as the slot of I/O Ports), dust or foreign matter is invaded, and some notebook computers are disposed on the rear side of the notebook. There is a liftable base to accommodate the slot in the rear body using the liftable base. This type of notebook computer is generally equipped with a motor at both ends of the base to lift the base through the rotation of the motor. However, during the production process, the motor may be different due to assembly or component itself (such as the motor body, the gear set in the motor or the slight error of the cable). The motor can not be synchronized to raise the two ends of the base to the set position synchronously. Therefore, during the process of raising the base, not only the running quality of the motor is not good, but also the base is easily damaged due to unbalance.

In view of the above, how to effectively control the lifting of the base to improve the operation quality of the lifting base has become one of the problems that the manufacturer is eager to solve.

The invention provides a lifting method of an electronic device and a base thereof, which can avoid damage caused by unbalance in the process of being lifted, and has better operating quality of the raised base.

The invention provides a lifting method for an electronic device base, which is suitable for an electronic device having a lifting device. The lifting device is disposed under the base of the electronic device, and includes a first motor and a second motor disposed at both ends of the base to lift the base. First, a first control signal is respectively supplied to the first motor, and a second control signal is sent to the second motor to control the rotation of the first motor and the second motor to raise the base. Then, the first time required for the first motor to lift the base to the end position and the second time required for the second motor to raise the base to the end position are respectively detected, thereby calculating the time difference between the first time and the second time. If the first time is less than the second time, the first control signal is modulated according to the time difference to delay the rotation of the first motor when the base is lifted next time.

The invention provides an electronic device comprising a base and a lifting device. The lifting device is disposed under the base, and the lifting device comprises a first motor and a second motor And a control unit. The first motor and the second motor are respectively disposed at both ends of the base to lift the base. The control unit is coupled to the first motor and the second motor. The control unit respectively provides a first control signal to the first motor and a second control signal to the second motor to control the rotation of the first motor and the second motor to raise the base and respectively detect the first motor lifting base The first time required to reach the end position, and the second time required for the second motor to raise the base to the end position, thereby calculating the time difference between the first time and the second time. If the first time is less than the second time, the control unit modulates the first control signal according to the time difference to delay the rotation of the first motor when the base is lifted next time.

Based on the above, in the lifting method of the electronic device and the base thereof of the present invention, the electronic device raises the base to the end position according to the time difference between the first motor and the second motor, so that the motor is lifted to the end position faster, the next time When the rotation is performed to raise the base, the rotation is delayed according to the time difference. In this way, the present invention can raise the base to the end position in synchronization with the second motor to improve the operation quality of the motor lifting base, and can avoid damage caused by the imbalance during the lifting process.

The above described features and advantages of the invention will be apparent from the following description.

100‧‧‧Electronic devices

102‧‧‧ button

110‧‧‧Base

120‧‧‧lifting device

122‧‧‧First motor

124‧‧‧second motor

126‧‧‧Control unit

20‧‧‧Input and output埠

H‧‧‧ Height

R, L‧‧‧ endpoint

E1‧‧‧ first place

E2‧‧‧ second place

S1‧‧‧ first preset level

S2‧‧‧ second preset level

△T1‧‧‧ first time

△T2‧‧‧Second time

△X‧‧‧ time difference

T1, t2‧‧‧ time point

S202, S204, S206, S208, S210, S402, S404, S406, S408, S410, S412, S414, S416, S418, ‧ ‧ ‧ steps of the lifting method of the electronic device base

FIG. 1A and FIG. 1B are diagrams showing an electronic device according to an embodiment of the invention. intention.

FIG. 1C is a block diagram of an electronic device according to an embodiment of the invention.

2 is a flow chart of a method for lifting a base of an electronic device according to an embodiment of the invention.

FIG. 3 is a schematic diagram of a lifting method of a base of an electronic device according to an embodiment of the invention.

4 is a flow chart of a method for lifting a base of an electronic device according to an embodiment of the invention.

In general, for an electronic device having a slot of an input/output port (I/O Ports), the electronic device is configured to have an integrated circuit (IC) in the slot in order to prevent foreign matter from entering the slot. The lifting device of the base is automatically raised to shield the slot to prevent foreign matter from entering the slot or to reduce the integrated circuit in the exposed slot in the air. Since the lifting device applies the force to the two ends of the base during the lifting of the lifting device, if the two ends of the base can be simultaneously raised to the preset end position, the base can be further prevented from being raised during the lifting process. Damage caused by unbalance, and can protect the function of the lifting device to properly lift the base. In order to clarify the content of the present invention, the following specific examples are given as examples in which the present invention can be implemented.

FIG. 1A and FIG. 1B are schematic diagrams of an electronic device 100 according to an embodiment of the invention. Referring to FIG. 1A and FIG. 1B , the electronic device 100 has a base 110 . And a lifting device 120, wherein the lifting device 120 has a first motor 122 and a second motor 124. In this embodiment, the electronic device 100 is, for example, a notebook computer, a tablet PC, a cell phone, a personal digital assistant (PDA) mobile phone, a smart phone, and a digital phone. A camera or the like or other electronic device configured with the lifting device 120. The base 110 can be used to carry components such as a motherboard, a hard disk, a keyboard, a heat sink, a slot, and the like of the electronic device 100. The lifting device 120 is disposed under the base 110, and the lifting device 120 can be used to lift the base 110 such that the base 110 of the electronic device 100 is raised to a height H, for example, between 0 and 3 cm (as shown in FIG. 1B). ).

In detail, the lifting device 120 is disposed, for example, on the rear body side of the electronic device 100 (that is, below the base 110 on the other side of the display of the electronic device 100), but is not limited thereto. The first motor 122 and the second motor 124 in the lifting device 120 are disposed, for example, at the left and right ends of the base 110 (such as the left end point L and the right end point R of the base 110), thereby being respectively raised and raised at both ends of the base 110. Base 110. Further, the first motor 122 and the second motor 124 of the present embodiment are, for example, stepping motors. In other embodiments, the first motor 122 and the second motor 124 may also be a direct current motor, an alternating current motor, a servo motor, or the like.

It is explained that after the base 110 of the electronic device 100 is lifted by the lifting device 120, a part of the casing disposed behind the electronic device 100 can be deployed, and the casing can be configured with an input/output port (I/O Port). For example, components such as a universal serial bus connection port, a video output port, a thunderbolt port, or a socket (for example, a USB connection slot) or other integrated circuit (IC) pins. That is, when the base 110 is not lifted, the electronic device 100 can receive the casing in the rear body, and when the base 110 is lifted, the rear body of the electronic device 100 deploys the casing, and then the device is disposed therein. Components such as input/output ports or slots on the chassis are exposed. For example, the base 110 of the electronic device 100 can be configured with an input/output port 20 (shown in FIG. 1B ), wherein the input/output port 20 can be used by the electronic device 100 when the lifting device 120 does not lift the base 110 of the electronic device 100 . The body is shielded (as shown in Figure 1A) to prevent these input and output ports 20 from being contaminated with dust or foreign matter. When the lifting device 120 lifts the base 110 of the electronic device 100, the base 110 of the electronic device 100 exposes the input/output port 20 (as shown in FIG. 1B) for the convenience of the user.

In this embodiment, the electronic device 100 can be configured with a specific button 102, and after the user presses the specific button 102, the first motor 122 and the second motor 124 of the lifting device 120 are ready to rotate to perform the base 110. Lift up (as shown in Figure 1B). Specifically, when the specific button 102 is not pressed, the first motor 122 and the second motor 124 are in a standby state, for example, the electronic device 100 does not supply power to the first motor 122 and the second motor 124, thereby saving the electronic device. 100 power consumption. However, when the specific button 102 is pressed, the electronic device 100 supplies power to the first motor 122 and the second motor 124, and then provides the first control signal to the first motor 122, and the second control signal to the second motor 124. The first motor 122 and the second motor 124 are rotated to raise the base 110.

It should be noted that, during the production process, the first motor 122 and the second motor 124 may be different due to assembly or components (such as the motor body, the motor). The gear set in the middle or the slight error of the cable) makes the characteristics of the rotational speed and torque of the first motor 122 and the second motor 124 difficult to be the same. Therefore, in order to cause the first motor 122 and the second motor 124 to raise the base 110 to the height H as much as possible, the electronic device 100 of the embodiment provides the first control signal and the second control signal to the different time points respectively. The first motor 122 and the second motor 124 cause the rotating motor to start rotating slowly. Thereby, damage to the base 110 due to unbalance during the lifting process can be avoided.

FIG. 1C is a block diagram of an electronic device 100 according to an embodiment of the invention. Referring to FIG. 1A to FIG. 1C , the lifting device 120 has a first motor 122 , a second motor 124 , and a control unit 126 , wherein the control unit 126 is coupled to the first motor 122 and the second motor 124 . Here, the control unit 126 controls the first motor 122 and the second motor 124 to raise the base 110. In detail, the control unit 126 provides a first control signal to the first motor 122 and a second control signal to the second motor 124. The first control signal and the second control signal are, for example, Pulse-Width Modulated (PWM) signals, and have setting information such as controlling the rotational speeds of the first motor 122 and the second motor 124. Therefore, the control unit 126 can provide the first control signal and the second control signal to the first motor 122 and the second motor 124 at different time points, respectively, so that the first motor 122 and the second motor 124 synchronize the base 110. Raise to height H.

FIG. 2 is a flow chart of a lifting method of the base 110 of the electronic device 100 according to an embodiment of the invention. Referring to FIG. 2, the lifting method of the present embodiment is applied to the electronic device 100 described above. The following is the electronic device 100 with FIG. 1A to FIG. 1C. The various components describe the detailed steps of the lifting method of the present embodiment.

First, the control unit 126 provides a first control signal to the first motor 122 and a second control signal to the second motor 124, respectively, to control the first motor 122 and the second motor 124 to rotate, thereby lifting the base 110 (step S202). Specifically, the control signal provided by the control unit 126 may correspond to a plurality of steps of the motor rotation. For example, the control signal provided by the control unit 126 may correspond to 140 rotation steps each time. That is to say, after receiving the first control signal and the second control signal, the first motor 122 and the second motor 124 respectively rotate the base 110 according to the corresponding number of steps.

Next, the control unit 126 detects the first time required for the first motor 122 to raise the base 110 to the end position, and the second time required for the second motor 124 to raise the base 110 to the end position (step S204). The end position refers to the position where the base 110 is located when the first motor 122 and the second motor 124 stop lifting the base 110, for example, the height H at which the base 110 is lifted. Here, the base 110 will not continue to be lifted after being lifted to the end position. More specifically, since the first motor 122 and the second motor 124 are disposed at both ends of the base 110, the end point L of the base 110 and the other end point R may be configured with a detecting unit (not shown). When the first motor 122 raises the end point L of the base 110 to the end position, the detecting unit can transmit the return signal to the control unit 126, and when the second motor 124 raises the end point R of the base 110 to the end position, the detection The unit can transmit another return signal to control unit 126. In other words, the first time detected by the control unit 126 is, for example, a long time required for the first motor 122 to raise the end point L of the base 110 to the end position, and the control list The second time detected by element 126 is, for example, the length of time required for second motor 124 to raise the other end point R of base 110 to the end position.

Here, the control unit 126 calculates the time difference between the first time and the second time to determine whether the first time is less than the second time (step S206). Moreover, if the first time is less than the second time, when the first motor 122 and the second motor 124 perform the next lifting operation of the base 110, the control unit 126 modulates the first control signal according to the time difference to delay the first motor. 122 is rotated (step S208).

That is, when the first time is less than the second time, it indicates that the first motor 122 lifts the base 110 to the end position relatively quickly, and the second motor 124 slowly raises the base 110 to the end position. Therefore, in order to allow both ends of the base 110 to be synchronously raised to the end position, the control unit 126 will start the first motor 122 to rotate slowly, that is, provide the first control signal to the first motor 122 slowly, thereby making the first A motor 122 and the second motor 124 can simultaneously raise the base 110. Of course, in other embodiments, when the first control signal is modulated according to the time difference, the control unit 126 also adjusts the frequency of the pulse width modulation signal that controls the rotation of the first motor 122 to reduce the first motor 122. At least one of the number of steps, speed, and acceleration or other parameters of the pulse width modulation signal is used to delay the rotation of the first motor 122.

On the other hand, if the first time is not less than the second time, the control unit 126 does not modulate the first control signal (step S210). Further, if the first time is substantially equal to the second time, the control unit 126 does not delay the first motor 122 to rotate.

It is noted that, since the embodiment does not limit the arrangement positions of the first motor 122 and the second motor 124 on the electronic device 100, that is, in other embodiments, the first motor 122 can be disposed at the end of the right side of the bottom plate 110. R, and the second motor 124 can be disposed at the end point L on the left side of the bottom plate, so that when one of the first motor and the second motor raises the base 110 to the end position, less time than the other motor will be the base The time required for the 110 to raise to the end position, the control unit 126 delays the rotation of the motor that is required for a shorter period of time. For example, when the second motor 124 raises the base 110 to the end position for a second time, less than the first time required for the first motor 122 to raise the base 110 to the end position, then at the first motor 122 and the second When the motor 124 performs the next lifting operation of the base 110, the control unit 126 delays the rotation of the second motor 124.

It should be noted that, in this embodiment, the motor fixture can be used to measure the time required for the motor to raise the base 110 to the end position, wherein when the motor starts to rotate, the signal detected by the motor fixture is maintained at the preset. The position is detected, and when the motor moves the base 110 to the end position, the signal detected by the motor fixture is lowered to the in-position position. Thereby, the control unit 126 can obtain the time and time difference between the first motor 122 and the second motor 124 raising the base 110 to the end position according to the preset level and the in-position level detected by the motor fixture.

For example, FIG. 3 is a schematic diagram of a lifting method of the base 110 of the electronic device 100 according to an embodiment of the invention. Referring to FIG. 3, before the first motor 122 is rotated until the base 110 is raised to the end position (ie, the first time ΔT1), the motor fixture can detect that the signal corresponding to the first motor 122 is maintained at the first time. Preset level S1. Wherein, when the first motor 122 raises the base 110 to the end position (ie, the time point t1), the motor fixture can measure that the signal corresponding to the first motor 122 is reduced to the first in-position level E1. On the other hand, before the second motor 124 starts to rotate until the base 110 is raised to the end position (ie, the second time ΔT2), the motor fixture can be measured to maintain the second motor 124 at the second preset level S2. . Wherein, when the second motor 124 raises the base 110 to the end position (ie, the time point t2), the motor fixture can measure that the signal corresponding to the second motor 124 is reduced to the second to-position level E2. In this way, the control unit 126 can calculate the time difference ΔX according to the time ΔT2 and the time ΔT1. In FIG. 3, since the time ΔT1 is less than the time ΔT2, the control unit 126 modulates the first control signal according to the time difference ΔX when the first motor 122 and the second motor 124 are lifted up to the base 110 for the next time. The first motor 122 is rotated to delay.

In addition, the motor fixture described above may be configured with a display unit, and when the first motor 122 and the second motor 124 start to rotate, and when the first motor 122 and the second motor 124 raise the base 110 to the end position, the control The unit 126 can switch the display lights of different colors through the display unit to prompt the user. More specifically, the control unit 126 of the present embodiment can set a preset in-position time required by the first motor 122 and the second motor 124 to raise the base 110 to the end position, for example, 80 ms. Here, when the rotation time accumulated by the first motor 122 and the second motor 124 starts to reach the preset in-position time, the control unit 126 determines whether the first motor 122 and the second motor have raised the base 110 to the end position, respectively. . Wherein, if the first motor 122 or the second motor 124 has lifted the base 110 to the end position, the control unit 126 will The first display light is displayed through the display unit. However, if the first motor 122 or the second motor 124 does not raise the base 110 to the end position, the control unit 126 displays the second indicator light through the display unit 110.

Referring to FIG. 3, it is assumed that the first time ΔT1 required by the first motor 122 to the base 110 to the end position is in accordance with the preset in-position time, and the rotation time accumulated when the first motor 122 and the second motor 124 start to rotate is reached. When the first time ΔT1, the control unit 126 can determine that the first motor 122 has raised the base 110 to the end position according to the first in-position level E1 and the second preset level S2 corresponding to the time point t1, and It is judged that the second motor 124 has not raised the base 110 to the end position. At this time, since the first motor 122 has lifted the base 110 to the end position, the control unit 126 displays the first indicator light (for example, a green light) through the display unit, and since the first motor 124 has not raised the base 110 to the end position. Therefore, the control unit 126 displays the second display light (for example, a red light) through the display unit. Thereby, the user can intuitively know which one of the motors rotates faster through the display light displayed by the display unit.

Of course, in this embodiment, if the rotation time accumulated by the first motor 122 and the second motor 124 starts to rotate has reached the preset in-position time, neither the first motor 122 nor the second motor 124 raises the base 110 to At the end position, the control unit 126 can also maintain the red light through the display unit. In this way, the user can know that the first motor 122 and the second motor 124 have not raised the base 110 to the end position within the preset time limit through the display light displayed by the display unit. Or, if the first motor 122 and the second motor 124 start to rotate, the accumulated When the rotation time has not reached the preset in-position time, and the first motor 122 and the second motor 124 have raised the base 110 to the end position, the control unit 126 can also switch from the display red light to the display green light through the display unit. Thereby, the user can know that the first motor 122 and the second motor 124 have raised the base 110 to the end position before the preset in-position time by the display light displayed by the display unit.

It is worth mentioning that after the control unit 126 delays the step of rotating the first motor according to the time difference between the first time and the second time, the control unit 126 can further perform a recursive correction procedure to repeatedly detect the The time difference between the motor and the second motor to raise the bottom plate 110 to the end position, and the control signal for controlling the next rotation of the motor, so that the time difference can be less than the threshold value.

FIG. 4 is a flow chart of a lifting method of the base 110 of the electronic device 100 according to an embodiment of the invention. Referring to FIG. 4, the method of this embodiment is applied to the electronic device 100 described above. The detailed steps of the lifting method of the present embodiment will be described below in conjunction with the components of the electronic device 100 of FIGS. 1A to 1C.

First, the control unit 126 provides a first control signal to the first motor 122 and a second control signal to the second motor 124, respectively, to control the first motor 122 and the second motor 124 to rotate, thereby lifting the base 110 (step S402). Next, the control unit 126 detects the first time required for the first motor 122 to raise the base 110 to the end position, and the second time required for the second motor 124 to raise the base 110 to the end position (step S404). And, the control unit 126 calculates the time difference between the first time and the second time to determine whether the first time is less than the second time (step S406). If the first time is not less than the second time, then the first motor 122 and the second When the motor 124 performs the next operation of lifting the base 110, the control unit 126 does not modulate the first control signal (step S408). If the first time is less than the second time, when the first motor 122 and the second motor 124 perform the next lifting operation of the base 110, the control unit 126 modulates the first control signal according to the time difference to delay the first motor 122. Rotation (step S410).

Different from the foregoing embodiment, the control unit 126 of the present embodiment performs a recursive correction procedure to re-detect the first time required for the first motor 122 to raise the base 110 to the end position, and the second motor 124 raises the base. The second time required for the 110 to the end position (step S412). And, the control unit 126 determines whether the time difference between the first time and the second time is less than the threshold value (step S414). Among them, the threshold value can be set according to the actual product demand, so that the time difference is less than the threshold value can be ignored.

At this time, when the time difference is less than the threshold value, the control unit 126 stops executing the recursive correction procedure, and when the first motor 122 and the second motor 124 perform the next lifting operation of the base 110, the control unit 126 does not adjust the first A control signal (step S416). On the other hand, when the time difference is not less than the threshold value, when the first motor 122 and the second motor 124 perform the next lifting operation of the base 110, the control unit 126 modulates the first control signal according to the time difference obtained in step S414. The first motor 122 is delayed to rotate (step S418), and step S412 is continued. In other words, control unit 126 re-executes the recursive correction procedure until the time difference is less than the threshold. Therefore, in the embodiment, the control unit 126 can not only delay the rotation of the motor, but also delay the rotation of the base 110, and the control unit 126 can repeatedly enter. The recursive correction procedure is performed to ensure that the time difference between the first motor and the second motor at each time the base 110 to the end position can be less than the threshold value and ignored. In this way, the lifting device 120 of the embodiment can have a higher operational function when the base 110 is raised.

In summary, in the lifting method of the electronic device and the base thereof of the present invention, the electronic device has a lifting device, and the lifting device has a first motor and a second motor disposed at both ends of the base, thereby lifting the base. Wherein, the electronic device adjusts the time difference between the first motor and the second motor to raise the base to the end position, so that the motor that lifts the base to the end position more quickly delays the rotation according to the time difference when the base is lifted next time. In addition, the electronic device may repeatedly detect the time difference, and the value to time difference is less than the threshold value, so that the time difference is within a negligible range. In this way, the present invention can raise the base to the end position in synchronization with the second motor to improve the operation quality of the motor lifting base, and can avoid damage caused by the unbalance of the base during the lifting process.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

S202, S204, S206, S208, S210‧‧‧ steps of the lifting method of the electronic device base

Claims (12)

A lifting method for an electronic device base is applicable to an electronic device having a lifting device, the lifting device is disposed under a base of the electronic device, and includes a first motor disposed at two ends of the base to lift the base And a second motor, the lifting method includes: respectively providing a first control signal to a first motor and a second control signal to a second motor to control the rotation of the first motor and the second motor, Lifting the base; detecting a first time required for the first motor to raise the base to an end position, and a second time required for the second motor to raise the base to the end position; calculating the first a time difference from the second time; and if the first time is less than the second time, the next control signal is modulated according to the time difference to delay the first motor to rotate when the base is lifted next time . The method of claim 1, wherein the step of modulating the first control signal to delay the rotation of the first motor according to the time difference further comprises: performing a recursion correction procedure to re-detect The first time required for the first motor to raise the base to the end position, and the second time required for the second motor to raise the base to the end position; determining the first time and the second time Whether the time difference is less than a threshold a value; and when the time difference is not less than the threshold value, the recursion correction procedure is re-executed until the time difference is less than the threshold value. The method of claim 1, wherein the first time required for the first motor to raise the base to the end position is detected, and the second motor is required to raise the base to the end position. The step of the second time includes: determining whether the first motor and the second motor have been lifted when the rotation time accumulated by the first motor and the second motor starts to reach a predetermined in-position time a base to the end position; if the first motor or the second motor has lifted the base to the end position, displaying a first indicator light; and if the first motor or the second motor does not lift the base to the At the end position, a second indicator light is displayed. The method of claim 1, wherein the first motor and the second motor are stepping motors. The method of claim 1, wherein the first control signal and the second control signal are pulse width modulation signals. The method of claim 5, wherein the step of modulating the first control signal to delay the rotation of the first motor according to the time difference further comprises: controlling the pulse width of the first motor to rotate The frequency of the signal is modulated to reduce at least one of the number of steps, speed, and acceleration of the first motor. An electronic device having a lifting device, comprising: a base; and the lifting device, disposed under the base, comprising: a first motor; a second motor, wherein the first motor and the second motor are respectively disposed at opposite ends of the base to lift the base; a control unit coupled to the first motor and the second motor, wherein the control unit provides a first control signal to a first motor and a second control signal to a second motor to control the first a motor and the second motor rotate to raise the base, and respectively detect a first time required for the first motor to raise the base to an end position, and the second motor raises the base to the end position Determining a time difference between the first time and the second time, wherein if the first time is less than the second time, the next time the base is lifted, the first time is adjusted according to the time difference A control signal delays rotation of the first motor. The electronic device of claim 7, wherein the control unit performs a recursive correction procedure to re-detect the first time required for the first motor to raise the base to the end position, and the first The second time required for the motor to raise the base to the end position, and determining whether the time difference between the first time and the second time is less than a threshold value, wherein when the time difference is not less than the threshold value, re-execution The recursive correction procedure until the time difference is less than the threshold. The electronic device of claim 7, wherein the control unit determines the first motor when a rotation time accumulated by the first motor and the second motor starts to rotate for a predetermined time. Is the second motor already Raising the base to the end position, if the first motor or the second motor has lifted the base to the end position, the control unit displays a first indicator light through a display unit, and if the first motor or the first When the two motors do not raise the base to the end position, the control unit displays a second indicator light through the display unit. The electronic device of claim 7, wherein the first motor and the second motor are stepping motors. The electronic device of claim 7, wherein the first control signal and the second control signal are pulse width modulation signals. The electronic device of claim 11, wherein the control unit reduces a frequency of the pulse width modulation signal that controls the rotation of the first motor to reduce the number of steps, speeds, and accelerations of the first motor. At least one of them.