JPH04162252A - Detecting device of prohibition of writing on recording medium - Google Patents

Abstract

PURPOSE:To improve reliability in detection of prohibition of writing information by providing two means of detecting the position of a switching means for discriminating 'writable' from 'unwritable'. CONSTITUTION:In a disk drive apparatus 1, a switch 14 is provided so that it can be discriminated whether information can be written in a disk cartridge 3 or not, and the switch 14 has two switches 14a and 14b. On the other hand, a hole 15 is formed in the disk cartridge 3 and a switching member 16 so designed that it can shift a position of writable and a position of unwritable is disposed therein. Besides, a means of detecting a state of unwritable is connected to the switch 14. A state of an information recording-reproducing apparatus is determined by a determination circuit 17 on the basis of the relationship between the two switches 14a and 14b and the position of the switching member 16, and based on the determination, the information recording-reproducing apparatus is controlled by CPU 18. According to this constitution, a disadvantage of destruction of data can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a write protection detection device for, for example, a disk-shaped recording medium housed in a cartridge.

[Conventional technology]

A disk-shaped recording medium is attached to an information recording and reproducing device to record and reproduce information, but it is necessary to prevent the already recorded information from being inadvertently erased.

For this reason, as described in Japanese Utility Model Application Publication No. 61-90064, the conventional example is to provide a switch member that moves between an erasable position and a non-erasable position on a disk cartridge, and to provide a single detection device in a disk drive device. Some means are provided to detect the non-erasable state only on the non-erasable position side.

In addition, as described in Japanese Utility Model Application Publication No. 62-90458, there is also a recording medium detection switch that detects whether a recording medium is installed in the device, and a prohibition switch that detects the open/closed state of the write-protect hole of the recording medium. A hole detection switch is provided, and write inhibition is detected by one detection switch.

5. Problems to be Solved by the Invention] However, conventionally, a single detection means is used to detect write-inhibition of information. If there is data that has been deleted, there is a risk that new data will be overwritten on top of it, destroying the previous data.

In order to solve this problem, there is an attempt to improve the reliability of the detection means by using a photo sensor instead of a contact switch as the detection means, but this requires a large space and is costly. There is a new problem that it will be uploaded.

The present invention is proposed to solve the above-mentioned problems.
It is an object of the present invention to provide a write-protection detection device for a recording medium that improves the reliability of information write-protection detection and does not require a large space or increase costs.

Means and operation for solving the problem] In order to achieve the above object, the present invention provides a cartridge containing a recording medium with a switching means for moving between a writable identification position and a writable identification position, and the cartridge A recording medium drive device in which the recording medium drive device is equipped with two detection means for detecting switching by the switching means is provided at least at positions corresponding to the writable identification position and the writable non-writing identification position, and the detection means detects at least the writing disabled state. This is a write inhibition detection device for a recording medium to which a detection means for detecting is connected.

In this way, since there are two detection means for detecting the switching means for identifying writable and writable states, there is no possibility that the write-inhibited state cannot be detected unless both of them fail at the same time. Furthermore, detection reliability can be improved even though the switch is an inexpensive and small mechanical contact type switch.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings. FIG. 1 is a perspective view of a disk cartridge and a disk drive device and a block diagram of a detection means according to a first embodiment of the present invention, and FIG. 2 is a partial perspective view of the disk cartridge viewed from the direction of arrow A. It is. Figure 3 shows
FIG. 2 is a partial perspective view of a disk drive device and a disk cartridge.

As shown in FIG. 3, the disk drive device 1 is provided with a cartridge insertion port 2, into which a disk cartridge 3 containing a disk-shaped recording medium is inserted and ejected. Further, near the cartridge insertion port 2, a cooling air intake port 4 and an eject button 5 for ejecting the disk cartridge 3 are provided.

Inside the disk drive device 1, a loading mechanism as shown in FIG. 1A is provided.

Although a detailed explanation of the loading mechanism will be omitted, when the disk cartridge 3 is inserted into the device, the disk cartridge 3 is transported into the device, and the loading mechanism is provided at a position where the disk cartridge 3 can be installed into the device. The cartridge positioning pin 6.7 engages with the cartridge positioning hole 8 formed in the disk cartridge 3 as shown in FIG. 2, so that the disk cartridge 3 is installed in a predetermined position in the device. It has become. The loading mechanism is provided on the device base 9, and the device base 9 also includes a spindle motor for rotating a disk-shaped recording medium, and a movable pickup 12 that moves along a kite rail 11 for recording and reproducing information. , a filter 13 and the like are provided to prevent dust from adhering to these members.

Further, a switch 14 is provided in the disk drive device 1 so as to identify whether information can be written to the disk cartridge 3 or not. This switch I
4 has two switches 14a and 14b. On the other hand, as shown in FIG. 2, a hole 15 is formed in the disk cartridge 3, and a switching member 16 that can be moved between a writable position (Fig. A) and a writable position (Fig. B) is provided. There is. The hole 15 is formed as shown in FIG. 1A when viewed from the front side of the disk cartridge 3, so that the switching member 16 can be identified.

Although not shown in FIG. 1A, the switch 14 is connected to detection means for detecting that writing is disabled as shown in FIG. 1B.

Next, a method for detecting whether or not a disk-shaped recording medium is in a write-protected state will be explained using this embodiment configured as described above. Table 1 shows two switches 14a
(S%%ll), 14b (SW2) and switching member 1
This is a definitional explanation of what state the information recording/reproducing apparatus should be in based on the relationship with the position of No. 6.

Table 1 Here, "rl" indicates that the switch is pressed by the switching member 16 and the switch is in the ON state, and "0"
indicates that the switch is located in the hole 15 on the side where the switching member 16 is not located and is in the OFF state. In the case of "1" and "l", indicates that there is an abnormality in the switch, and in the case of "rl" and "70-", the switching member 16 is located as shown in FIG. 2A, and only SWI is pressed. In the case of "ro4rl", the switching member 16 is located as shown in FIG. Indicates that there is, "0"
``In the case of 0-1, all switches are in the OFF state, indicating that there is no cartridge.

Table 2 A Table 2 B Next, Table 2 shows the case where one of the switches fails. Table A shows the case where the SWI is in the "1" state. SW2 is operating normally. Therefore, an abnormal signal appears even though the cartridge is originally in a write-protected state, and a write-enabled signal appears even though it is originally in a state in which there is no cartridge. In the former case, data destruction does not occur because no write operation is performed. In the latter case, there is no problem because data is not destroyed.

Table B shows a case where the SWI is in the "0" state. Therefore, a signal indicating that there is no cartridge appears even though the cartridge is originally in a writable state. In this case, data destruction does not occur because no write operation is performed.

Table 0 shows the case where SW2 is in the "I" state. SWI is operating normally. Therefore, an abnormal signal appears even though the cartridge is originally in a writable state, and a write-inhibited signal appears even though there is no cartridge. In either case,
Data destruction does not occur because no write operation is performed.

Table D shows the case where SW2 is in the "0" state. In this case, a signal indicating that there is no cartridge appears even though it is originally in a write-protected state. In this case, data destruction does not occur because no write operation is performed.

In this embodiment, SWI including signals in each case as described above is used.
, the signals from SW2 are judged by the judgment circuit 17 as shown in FIG. 1B, and the CPU 18 controls the information recording/reproducing apparatus based on the judgment, thereby avoiding the inconvenience of data destruction. In other words, even if either of the two switches fails, the worst situation of data destruction will not occur.

Next, a second embodiment of the present invention will be described. In this example,
Rewritable magneto-optical disk and read-only ROM
Use a disk drive device that can share disks. In this case, the disk cartridge is as shown in FIG. 4, where FIG. A shows a rewritable magneto-optical disk in a writable state, FIG. 8 shows a non-writable state, and FIG. 0 shows a ROM disk.

Table 3 defines and explains what state the information recording/reproducing apparatus should be in depending on the relationship between the two switches SWI and SW2 and the position of the switching member 16. Here, the meanings of 'IJ' and '0' are the same as those explained in Table 1. In the case of this embodiment, when rlj is "1", it indicates that it is a ROM disk, and when rl, + rO, +, the switching member 16 is located as shown in FIG. 4A. , indicates that the state is ready for writing, "0""1
”, the switching member 16 is positioned as shown in FIG. 4B, indicating that writing is not possible, and rOq
If it is "0", it indicates that there is no cartridge.

Next, Table 4 shows the cases where one of the switches fails. In addition, in the disk drive device according to this embodiment, the light emission output of the laser is PWE>PM″i5
> It is related to FROM. Here, PIFE represents the write/erase power of the rewritable recording medium, PMo represents the read power of the rewritable recording medium, and PMo represents the read power of the rewritable recording medium. 1
indicates the read power of the read-only recording medium. Since a ROM disk generally has a reflective film formed by one vapor deposition process like a music CD, data destruction will not occur even if the ROM disk is irradiated with a laser beam using PWE.

Table A shows a case where the SWI is in the "1" state. SW2 is operating normally. Therefore, the ROM signal appears even though it is in a write-disabled state, and the M'6 write-enabled signal appears even though it is originally in a state where there is no cartridge. In the former case,
The light output is P. However, since there is a relationship of PRow < PMo, data destruction will not occur. In the latter case, there is no problem because data is not destroyed.

Table B shows a case where the SWI is in the "0" state. Therefore, a signal indicating that M6 cannot be written appears even though it is originally a ROM, and a signal indicating that there is no cartridge appears even though it is originally in a writable state. In either case, no inconvenience occurs because no laser is emitted.

Table 0 shows the case where SW2 has failed in the state of f. SWI is operating normally. Therefore, a ROM signal appears even though it is originally in an Mδ write-enabled state, and a plate-unwritable signal appears even though it is originally in a state in which there is no cartridge. In the former case,
Since there is a relationship of FROM <PM'''6, data destruction will not occur.In the latter case, data destruction will not occur, so there is no problem.

Table D shows a case where SW2 has failed in the state of "0. In the former case, even if a laser beam is emitted by PllE, the ROM disk is made of AI vapor deposition and has a reflective film formed on it, so data will be destroyed. In the latter case, there is no problem because data is not destroyed.

As described above, in this embodiment, the inconvenience of data destruction can be avoided by detecting the signals from SWI and SW2 using the same detection means as in the first embodiment and controlling the information recording/reproducing apparatus. In other words, even if either of the two switches fails, the worst situation of data destruction will not occur. Furthermore, in this embodiment, it is also possible to detect a ROM disk.

Next, a third embodiment of the present invention will be described. In this example,
Similar to the second embodiment, a disk drive device that can share a rewritable magneto-optical disk and a read-only ROM disk is used, but this device is equipped with a third switch (SW3H4c) to detect the presence or absence of a disk cartridge. (FIG. 5A). In this case, the disk cartridge is constructed similarly to that shown in the second embodiment (FIG. 4).

Table 5 Table 5 shows the three switches SWI, SW2, SW3.
This is a definitional explanation of the state of the information recording and reproducing apparatus, which cannot be judged based on the relationship between the position of the switching member 16 and the position of the switching member 16. Here, 71. The meanings of . and "0" are the same as those explained in each of the above embodiments. In the case of this example, "1""1"
[1] indicates that it is a ROM disk;
In the case of rOj and the case of "o", "1", and "0", the case of "0"
” “o” “1” indicates an abnormality,
M? 5 Indicates that it is in a writable state, "0""l""
1” indicates that writing is prohibited, and “0”
“0” “0” indicates that there is no cartridge.

Table 6 Table 6 E Next, Table 6 shows the case where one of the switches fails. Note that in the disk drive device according to this embodiment, conditions such as laser light emission output are the same as in the second embodiment. Table A shows a case where the SWI is in the "1" state. Other switches are working normally.

Therefore, even though M6 is originally in a write-protected state, R
The OM signal appears, and even though there is no cartridge, an abnormal signal appears. In the former case, PR
Since QM < PMτ, data destruction does not occur. In the latter case, a switch failure can be detected because the abnormality signal remains even after the disk cartridge is ejected.

Table B shows the case where the SWI is in the "0" state. Therefore, a signal indicating an M''6 write-inhibited state appears even though it is originally a ROM, and an abnormal signal appears even though it is originally in an M6 write-enabled state.

In the former case, no data is destroyed because the laser is not emitted. In the latter case, a switch failure can be detected.

Table 0 shows the case where SW2 is in the "1" state. Other switches are working normally. Therefore, a ROM signal appears even though it is originally in a writable state, and an abnormal signal appears even though it is originally in a state where there is no cartridge.

In the former case, although the beam from 'FROM is emitted, there is a relationship of FROM<PM'7o<PWE, so no data destruction occurs. In the latter case, a switch failure can be detected because the abnormality signal remains even after the disk cartridge is ejected.

Table D shows the case where SW2 is in the "0" state. Therefore, a signal indicating an M6 writable state appears even though it is originally a ROM, and a signal indicating no cartridge appears even though it is originally an Mδ write-inhibited state. In the former case, even if a laser beam is emitted by PWE, data destruction will not occur because the ROM disk has a reflective film formed by AA vapor deposition as described above. In the latter case, a switch failure can be detected.

Tables E and F show cases where SW3 is in the rlJ state and "0" state, respectively.

Other switches are working normally. I want to, E.
In the case of the front, an abnormal signal appears even though there is no cartridge, and in the case of the F table, the error signal appears even though it is originally a ROM, M6 writable state, and Mδ write prohibited state. A signal appears. If no switch failure is detected, everything is operating normally.

In this embodiment, the signals from the three signals are judged by the judgment circuit 17 as shown in FIG. 5B, and based on the judgment, the CP018
By controlling the information recording and reproducing device using the above, the inconvenience of data destruction can be avoided. In the case of this embodiment, even if two switches fail, it is possible to detect the switch failure, so the detection probability is increased and the reliability of information write prohibition detection is improved.

Although a mechanical contact type switch is used to reduce the cost and size of the device, it goes without saying that the detection means is not limited to this.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a device that can detect the write-inhibited state of information, the write-enabled state, and the presence or absence of a disk cartridge with a minimum number of switches. Even if a failure occurs, the recorded data can be controlled so as not to be destroyed. Furthermore, detection of a rewritable recording medium and a read-only recording medium can be performed using the same number of switches as described above.

[Brief explanation of drawings]

1 is a perspective view of the inside of a disk drive device and a block diagram of a detection means according to a first embodiment of the present invention; FIG. 2 is a partial perspective view of the disk drive unit; FIG. FIG. 4 is a partial perspective view of a disk cartridge according to a second embodiment of the present invention, and FIG. 5 is a partial perspective view of a disk drive device according to a third embodiment of the present invention. FIG. 2 is a perspective view of the sensor and a block diagram of the detection means. 1... Disk drive device 3... Disk cartridge 14... Switch 17... Judgment circuit 18... CPU Fig. 1 1'/Rj Fig. 2 A B Fig. 3 Fig. 4 Procedure supplement Author: February 1, 1991, Toshi Uematsu, Commissioner of the Japan Patent Office1, Indication of the case, 1990 Patent Application No. 2872942, Name of the invention, Recording medium write prohibition detection device 3, Person making the amendment Related: Patent applicant J, page 4, lines 12-13 of the specification [disappears]. 2. Delete ``as shown in Figure 1A'' on page 5, lines 10-11. 3. Table 2 A on page 8 of the same page is corrected as follows. [Table 2 A4, Table 6 on page 19 of the same page is amended as follows. ``In Table 6 A5, page 25, lines 2 to 4, ``1111 high (Nari) of this embodiment'' has been changed to ``In the case of this example, the probability of detecting an abnormality is high (Nari, double failure. ``The second step is to notify the user of the failure early before the failure occurs.''

Claims (1)

[Claims] 1. A cartridge storing a recording medium is provided with a switching means for moving between a writable identification position and a writable non-writing identification position, and a recording medium drive device into which the cartridge is installed is provided with a detection means for detecting switching by the switching means, A write-protection detection device for a recording medium, characterized in that two detection devices are provided at least at positions corresponding to the write-enabled identification position and the write-disabled identification position, and a detection device for detecting at least write-inhibition is connected to the detection device.