JP2006273189A - Electric equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electronic equipment having a door opening/closing device capable of taking measures in such an unexpected occurrence that foreign matters such as a finger are caught by a door with a simple configuration. <P>SOLUTION: In the electronic equipment having the door opening/closing device, the rate of change of the output voltage of a potentiometer to detect the door position is monitored. When the moving rate of the door is smaller than a predetermined value, it is determined that the door stops its movement by some cause, and the drive of the door is stopped. Since the potentiometer for detecting the position is also used for detecting any abnormality, the configuration is simplified. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic device such as an in-vehicle acoustic device. More specifically, the present invention relates to an electronic device including a door opening / closing device.

  For example, an electronic device such as a vehicle-mounted acoustic device may be configured to be able to open and close the door. The door is provided with display means, and the angle of the display means can be changed by opening and closing the door, and for example, a CD insertion slot can be provided at the back of the display means. Is good.

  However, when the door is automatically opened and closed using a driving source such as a motor, it is necessary to provide a safety mechanism so that the user's finger or the like may be caught and injury will not occur.

Although different from in-vehicle acoustic equipment, Japanese Patent Application Laid-Open No. 9-21273 discloses a door opening / closing control device that detects changes in the voltage and current of a motor that drives the door, and changes in both current and voltage. Discloses a configuration in which when it is equal to or greater than a predetermined threshold value, it is determined that a foreign object is sandwiched, and rotation of the motor is stopped and reversed.
JP-A-9-21273 (E05F 15/10, B60J 1/00)

  As described above, an electronic device capable of opening and closing a door is used, and a countermeasure against the trapping of a foreign object is considered in the door opening and closing control device. However, the above-described prior art requires detection means for detecting changes in both the voltage and current of the motor that is the drive source, which complicates the configuration and control.

  Therefore, the present invention proposes an electronic apparatus having a door opening / closing control device that can be simplified in structure.

  The present invention includes a door open / close drive source, a potentiometer for detecting the door open / close position, and a control means for the drive source for determining the output of the potentiometer. Therefore, a potentiometer provided for detecting the opening / closing position of the door is used to detect whether there is an abnormality in the opening / closing operation of the door. When an abnormality is determined, the drive source is controlled to perform a predetermined process.

  More specifically, when the potentiometer outputs the opening / closing position of the door by voltage, an abnormality is detected based on the speed (ratio) of the voltage change of the potentiometer.

Therefore, according to the present invention, there is an effect that a foreign object such as a finger is caught with a simple structure without requiring an additional structure. That means
This is effective because a door opening / closing abnormality (foreign matter pinching) can be detected using a potentiometer for detecting the position of the door.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a front view showing the front of one embodiment of the present invention, FIG. 2 is an explanatory view showing a state where a door (bezel) is slightly opened, and FIG. 3 is an explanatory view showing a state where the door is closed, FIG. FIG. 5 is a circuit diagram showing an electrical configuration in the embodiment, FIG. 5 is an explanatory diagram of the structure in the vicinity of the potentiometer, and FIG. 6 is a flowchart of control of the door (bezel).

  In FIG. 1, 1 is a door (bezel), 2 is a display unit, and 3 is an open button (instructing opening / closing of the door) provided on the door (bezel). In one embodiment of the present invention, the door (bezel) can be opened and closed, and in the open state, the cassette or CD insertion slot provided in the main body 4 hidden behind the door (bezel) is exposed. (Not shown). On the display unit, graphic display relating to the operation and state of the acoustic device is performed. FIG. 3 shows a state in which the door (bezel) is closed as described above, but when a finger is caught as shown in FIG. 2 during the movement of the door (bezel) from the open state to the closed state, FIG. There is a risk of injury to the user. In addition, when a pen or the like is caught, the door (bezel) opening / closing mechanism of the electronic device may be broken.

  In FIG. 5, reference numeral 5 denotes a rotary potentiometer, which exhibits a resistance value corresponding to the rotational position. A rotary gear 6 is attached to the rotary shaft of the rotary potentiometer 5. The rotating gear 6 meshes with the slide gear 7, and the rotating gear 6 rotates as the slide gear 7 moves in the left-right direction in the figure, and the resistance value exhibited by the rotating potentiometer 5 changes. In this manner, the open / closed position of the door (bezel) can be detected from the resistance value exhibited by the rotary potentiometer 5.

  As shown in FIG. 4, the rotary potentiometer 5 has one end connected to a + 5V power supply terminal and the other end grounded. The changing resistance value of the potentiometer 5 is taken out as a voltage value of the terminal 5 a and supplied to the microcomputer 8. At the input terminal 8 a of the microcomputer 8, the voltage as an analog value is converted into a digital value by the AD conversion function and is taken into the microcomputer 8. The position of the door (bezel) is controlled by the microcomputer 8 observing this input voltage and controlling the rotation of the motor 9 that is the drive source of the door (bezel) via the motor drive circuit 10. .

  The home position switch 11 is a switch that is turned on when the door (bezel) reaches the closed position, and the microcomputer 8 stops the motor 9.

  Next, referring to FIG. 6, an explanation will be given of the operation for countermeasures against foreign objects being caught. When the door (bezel) is closed, that is, in the open state, when the open button 3 is operated, the motor 9 starts to rotate in the door (bezel) closing direction (62). During the period when the motor 9 is rotating, the microcomputer 8 periodically samples and evaluates the output voltage of the potentiometer 5. And the change of the output voltage of the potentiometer 5 is noted. If the voltage change is equal to or greater than a predetermined ratio, it can be seen that the rotational speed of the motor 9 and thus the speed of movement of the door (bezel) is equal to or greater than the predetermined speed.

  On the contrary, when the voltage change is smaller than a predetermined ratio, it can be seen that the rotational speed of the motor 9 and thus the moving speed of the door (bezel) is smaller than the predetermined speed. Therefore, it can be seen that the door (bezel) has stopped moving, that is, foreign matter has been caught by appropriately setting the threshold value for discrimination. At this time, the home position switch is off.

  The change in the voltage of the potentiometer 5 can be measured by using the difference between the immediately preceding sample value and the current sample value in the sampled voltage value. More specifically, if the difference from the immediately preceding sample value in some of the most recent (for example, 5 samples) is equal to or less than a predetermined value, it can be determined that the change rate is slow.

  If the change speed is not slow, the process is performed as it is. That is, the rotation in the closing direction is stopped, the motor is temporarily rotated in the opening direction (by the delay timer), and then the rotation of the motor 9 is stopped. By this series of processes (64 to 67), the holding of the foreign matter can be released.

  In this way, the configuration is simplified by using the potentiometer (which knows the position of the door based on the output voltage of the potentiometer) that is originally used for detecting the position of the door (bezel) to detect the speed of movement of the door. I can do it.

The front view showing the front of one Example of this invention Explanatory drawing showing a state where the door (bezel) is slightly opened Explanatory diagram showing the door closed Circuit diagram showing electrical configuration in the embodiment Illustration of the structure near the potentiometer It is a flowchart of control of a door (bezel). It is a front view which shows the closed position of the panel in 1 Example.

Explanation of symbols

1 Door (bezel)
2 Display 3 Button 4 Body 5 Potentiometer 6 Rotating gear 7 Slide
8 Microcomputer 9 Motor

Claims (3)

In an electronic device comprising a door drive mechanism and drive source,
Means for detecting the position of the door;
Speed detection means for detecting the speed of movement of the door based on the output of the detection means,
An electronic device that stops driving the door when the speed of movement of the door is a predetermined value or less. 2. The electronic apparatus according to claim 1, wherein the position detecting means is a rotary potentiometer, and the speed is detected by a change in voltage output of the potentiometer. The electronic device according to claim 2, wherein the door is driven in the reverse direction for a predetermined time after the drive of the door is stopped.