JPH0424517Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an operation switch for a disc player.

[Conventional technology]

In optical disc players and the like, a microcomputer detects whether a disc holder is in a playing position or a disc receiving position, and controls subsequent operations of the player based on this detection signal.

Figure 9 shows an example of the main parts of such a CD player. 1 is a microcomputer that controls the operation of the player, and 8 is its input port.
It ranges from A ₀ to _{A 7} . 10 is a switch that changes depending on which of the two positions the disk holder is in; its fixed contacts 10a and 10b are applied to input ports _A6 and _A7, respectively, and its movable contact 10c
will be installed. 6 is a manual changeover switch for changing programs and is connected to port _A5 . 3, 4, and 5 are resistors that require DC voltage supply.

Now, when the disk holder operation button on the front panel (not shown) of the CD player is pressed, the disk holder comes out of the front panel (open position) to accept the disk. At this time, this front panel turns the movable contact 10c of the switch 10 toward the fixed contact 10a, and grounds the port _A6 .
In this way, the microcomputer 1 is informed that the disk holder is at the disk receiving position. Next, when a disc is placed on the holder and the holder is pushed into the disc playing position, the holder brings the movable contact 10c of the switch 10 closer to the fixed contact 10b and grounds the port _A7 . In this way, the microcomputer 1 is informed that the holder has come to the disc playing position. In addition, information such as the operation status of the front operation panel is transmitted to the microcomputer 1 via ports _A0 to _A4 . Based on this information, the microcomputer 1 automatically performs a series of operations such as loading, playing, and ejecting the disc according to a predetermined program.

Various types of such microcomputers and their programs are well known, and since they are not directly related to the subject matter of this invention, their description will be omitted.

Next, for example, if the above-mentioned CD player breaks down, the program of the microcomputer 1 may be partially changed to perform only the desired operation from the series of operations described above or to perform an operation check. , it is convenient for troubleshooting to change to a program for troubleshooting. Input port A ₅ is used here to change the program as described above, and when the manual switch 6 is pressed and input port A ₅ is grounded, the program change as described above is made. . The troubleshooting program itself is also well known and is not directly related to the subject matter of the present invention, so a description thereof will be omitted.

[Problem that the invention attempts to solve]

As mentioned above, such conventional CD players have the disadvantage that one of the input ports must be used to change the program.

[Means for solving problems]

According to the present invention, the program is changed only when signals are simultaneously applied to the two input ports to which signals for detecting the position of the disk holder are applied.

[Effect]

Since it is impossible for the disk holder to occupy the above two positions at the same time, when signals indicating the two positions of the holder are applied at the same time, it can be determined that this is a command to change the program.

〔Example〕

FIG. 1 shows an embodiment of the present invention. The difference in this figure from Figure 3 is that manual interlocking switches 11 and 12 are connected between ports A ₇ and A ₆ and the ground, and the switch connected to port A ₅ for changing the program is replaced. The point here is to add information for controlling other disks. In addition, as shown in the flowchart of FIG. 2, the microcomputer 1 determines whether or not ports A ₆ and A ₇ are grounded at the same time, and only if they are grounded at the same time, the microcomputer 1 is programmed with a troubleshooting program. In other cases, the normal operation program is executed.

The operation of the above configuration will be explained. Normally, as explained in the conventional example above, the holder is in either the playing position or the disc receiving position, but cannot be in both positions at the same time, so ports A ₆ and A ₇ are both at the same time. It is never grounded. Therefore, the microcomputer 1 executes a normal operation program that performs control according to the holder position.

Next, when changing the program to one for troubleshooting, operate the interlocking switches 11 and 12 to ground ports _A6 and _A7 at the same time. Then, the microcomputer 1 executes a fault repair program suitable for repairing the fault.

〔effect〕

As described above, according to the present invention, there is no need to use one additional input port for changing the program, so the input port can be used for other purposes, and its practical effects are great.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the main parts of the invention, Figure 2
The figure shows a flowchart, and FIG. 3 is a block diagram showing a conventional example. 1... Microcomputer, 10... Holder position detection switch, 11, 12... Program change switch.

Claims (1)

[Scope of utility model registration request] It detects whether the disk holder is in the first state or the second state and outputs the first signal or the second signal, respectively.
means for generating signals and applying them to corresponding input ports of the microcomputer; means for causing the microcomputer to execute corresponding controls according to the normal operation program in response to the first signal or the second signal; A disk player comprising: means for causing a computer to execute a troubleshooting program; means for simultaneously applying the first signal and the second signal to the input port; and means for simultaneously applying the first signal and the second signal to the input port; and means for causing the microcomputer to execute a troubleshooting program when the computer is installed.