JPH0666102B2 - Disk device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a disk device for recording or reproducing information using a floppy disk (flexible magnetic disk) or a disk similar thereto.

2. Description of the Related Art A magnetic disk device has a disk rotating mechanism, a magnetic head (transducer), and a head moving mechanism. The head moving mechanism is generally composed of a stepping motor which responds to a step signal and a rotation-linear conversion mechanism for obtaining a linear motion corresponding to the rotational motion of the motor. The head is moved in the radial direction of the disk (track crossing direction). Is configured to move.

When recording information (data) on a disk with this type of magnetic disk device, it is necessary to detect whether or not data that should not be erased is written on the disk.
Therefore, the general disk cartridge is provided with an optical detected portion which can be called a write-inhibited detected portion or a file-protected detected portion. by the way,
In the conventional device, the light emitting element for optical detection was made to emit light over the entire period of use of the disk device,
Inevitably, the amount of power consumption has increased.

Therefore, an object of the present invention is to provide a disk device capable of saving power.

According to the present invention to achieve the above object, a write-prohibited detected object for optically determining whether a recording medium disk is housed in a case and information writing to the disk is prohibited in the case. Is a device for converting information using a disk cartridge provided with a unit, and for converting information between a disk rotating mechanism for rotating the disk and the disk during rotation of the disk. A converter for carrying out the operation, a converter moving mechanism for moving the converter in the track crossing direction of the disk, and a cartridge moving mechanism for the rotation mechanism in order to optically detect the write protected part. A write-prohibition detecting light-emitting element arranged so as to correspond to the write-prohibition detected portion in a normal loading state, and the write-prohibition A light receiving element arranged corresponding to the light emitting element for detecting a detected portion, a switch connected to a power supply line of the light emitting element for selectively causing the light emitting element to emit light, and a rotational driving start of the disk A switch device including a switch control circuit for controlling the switch so that the light emitting element emits light for a predetermined period set within a period from a time point to a ready time point when the disk is in a substantially normal rotation state. It is related.

Effects of the Invention The above invention has the following effects.

(A) Since the write-inhibition detecting light-emitting element is caused to emit light for a predetermined period set within the period from the start of the rotational drive of the disk to the ready, the significant power saving is achieved.

(B) Since write-protection (write protect or file protect) is detected during a predetermined period set within the period from the start of the disk rotation drive to the ready, the write-protection information is obtained immediately before the start of recording / reproduction. be able to. Therefore, it is possible to surely obtain the necessary write-prohibition information despite the short detection period.

Embodiment Next, a magnetic disk device according to an embodiment of the present invention will be described with reference to FIGS.

1 and 2 show a magnetic disk cartridge (1) used in this magnetic disk device. This cartridge (1) is generally called a micro floppy disc and is constituted by accommodating a recording medium disc (2) having a diameter of 86 mm in a synthetic resin case (3) having rigidity. Surface (4) of case (3)
Head insertion openings (6) (7) on both the back and back (5)
Is provided, and the openings (6) and (7) are closed by a sliding shutter (8) when not in use. The shutter (8) is biased to the right in FIG. 1 by a spring (not shown), and is moved to the left against this biasing force during use. The shutter (8) is opened by pressing this side surface. The disk (2) of the disk cartridge (1) of this embodiment has a hub (2) composed of a magnetic sheet (2a) and a magnetic metal disk mounted in the center thereof.
b) consists of Since the disk (2) is not rotated by pressing with the clamper, the opening (10) for rotational drive is provided only on the back surface (5) of the case (3), and the hub (2b) is exposed from here. There is. The hub (2b) is provided with a spindle insertion hole (2c) and a drive pin insertion hole (2d). (9) is a write-prohibition non-detection part, and a window (9a) that is in a light transmission state when write-protection is
When writing is not prohibited (recordable), the window (9
It consists of a lid (9b) for closing a). The lid (9
b) is a slide type that can be opened and closed.

The main part of the magnetic disk device for recording / reproducing data using the cartridge (1) shown in FIGS. 1 and 2 is constructed as shown in FIG. In this FIG.
The turntable (11) is for rotating the disk (2) in the case (3) of the cartridge (1) loaded at a predetermined position, and a magnet (not shown) that attracts the hub (2b). , A spindle (not shown) inserted into the hole (2c),
It has a drive pin (not shown) and the like to be inserted into the hole (2d). (12) is an outer rotor type motor directly connected to the rotary base (11). (13) and (14) are recording / reproducing magnetic heads as converters, which are attached to the carriage (15) and are movably guided in the radial direction of the disk (2). (16) is a stepping motor which constitutes a head moving mechanism. The carriage (15) is connected via a known straight-line conversion mechanism (17) consisting of an α-wound steel belt, a pinion and a rack, or a lead screw. It is driven. Reference numeral (18) is a light shielding plate for detecting the track zero position of the heads (13) and (14).
It is integrated in 5). (19) is head (13) (14)
A light emitting diode for detecting the track zero position of
(20) is a phototransistor. The light input of the phototransistor (20) is blocked corresponding to the track zero position of the heads (13) (14).

Reference numeral (21) is a write protect (light protect) detecting light emitting diode, which is arranged corresponding to the window (9a) at the normal loading position of the cartridge (1). (twenty two)
Is a phototransistor for detecting write protection, and
It is arranged corresponding to a) and receives the light of the light emitting diode (21) when the window (9a) is opened.

Reference numeral (23) denotes a disk loading detection light emitting diode, which is arranged so as to be on one side of the normal loading position of the cartridge (1). Reference numeral (24) is a disk-loading detection phototransistor, which is arranged on the other side of the cartridge (1) so that the incident light from the light emitting diode (23) is blocked when the cartridge (1) is loaded. .

Reference numeral (25) is a rotation detector of the disk (2), which is a light reflection index attached to the surface of the rotor (26) of the outer rotor type motor (12) which rotates together with the disk (2) and the turntable (11). That is, a light emitting diode (28) for detecting the index (27) and a phototransistor (29) are provided, and the rotational angular position and rotational speed of the disk (2) are detected. (30) is a ready detection circuit, which is a rotation detector (2
Based on the output of 5), the disk (2) has a normal speed of 90.
A signal indicating that the ready state (recording / playback preparation complete state) has been reached is output based on the fact that the rotation speed has reached a percentage or more and that a fixed time (for example, 420 ms) has elapsed since the start of rotation.

FIG. 4 shows the stepping motor (16) of FIG. 3 and its drive circuit. The stepping motor (16) has a four-phase configuration including a first phase winding (31), a second phase winding (32), a third phase winding (33), and a fourth phase winding (34). This is a stepping motor, and the transistor (3
5) The rotor (not shown) is rotated by a predetermined angle by sequentially controlling ON / OFF of (36), (37) and (38) by a one-phase excitation method.

FIG. 5 shows an electric circuit portion of the magnetic disk device shown in FIG. As is clear from FIG. 5, the light emitting diode (19) for detecting the track zero and the light emitting diode (21) for detecting the write inhibition are not simply connected to the power source, and the transistor (39) as the switch according to the present invention is used. It is connected to the power supply circuit via. That is, two light emitting diodes (19) and (21) are connected in series with each other, and the anode is + 5V.
And a transistor (39) connected between the cathode and ground. Therefore,
A current flows through the light emitting diodes (19) (21) only while the transistor (39) is on.

Next, the control circuit of the transistor (39) in FIG. 5 will be described with reference to FIGS. 6 and 7. The power-on detection circuit (43) connected to the + 12V power supply terminal (41) and the + 5V power supply terminal (42) of the entire disk device is supplied with power to the power supply terminal (41) and has a constant power supply voltage. (Eg, 70-80% of normal voltage) is detected by the voltage comparator, and the + 5V power supply terminal (42) voltage has reached a constant value (70-80% of normal voltage). Detect and
When both + 12V and + 5V are detected, a high-level power-on signal is transmitted as shown at time t _{1 in} FIG. 6 (A).

The first timer (44) connected to the output of the power-on detection circuit (43) has a high-level pulse of T ₁ = 12 ms in response to the power-on detection signal changing to a high level at time t _1. Is transmitted as shown in FIG. 6 (B). The output of this timer (44) is the stepping motor control drive circuit (4
5) and is used for multi-phase excitation of the stepping motor (16) only when the power is turned on. Timer (4
The output of 4) is connected to the first input terminal of the first OR gate (46). The output of this first OR gate (46) is
It is connected to one input terminal of the second OR gate (47) and also connected to the other input terminal of the second OR gate (47) via a delay circuit (48) of 100 μs. Second
The output of the OR gate (47) is connected to the base of the transistor (39) via the amplifier (49). Therefore, when the output of the timer (44) becomes high level during the period of t _{1 to} t ₂ as shown in FIG. 6 (B), the output of the first OR gate (46) also becomes the sixth.
As shown in the figure (L), the level becomes high, and eventually the transistor (39) is turned on.

The stepping motor control drive circuit (45) is connected to the line (5
The step signal is supplied from (0) and the line (51)
The stepping motor (16) is driven by the supply of the step direction signal from the device, and the step pulse is distributed so as to drive the transistors (35) to (38) shown in FIG. 4 by the one-phase excitation method. It includes a known circuit. In addition, the control drive circuit (45) outputs a signal for turning on the first-phase transistor (35) shown in FIG. 4 in response to a high level power-on detection signal obtained from the power-on detection circuit (43). Occur. Since this device is configured so that the track zero position of the heads (13) and (14) corresponds to the first phase winding (31), an exciting current is applied to the first phase winding (31) when the power is turned on. By supplying it, the heads (13) and (14) can be held at the track zero position. When the track zero is not detected by the light emitting diode (19) and the phototransistor (20), a step pulse for returning the head to the track zero is generated.

By the way, since the detection error due to the light emitting diode (19) and the phototransistor (20) is about two track pitches, the heads (13) and (14) are track 1 other than track zero.
Or even in the case of 2, the track zero detection signal may be generated. If the heads (13) and (14) are on the track 1, the rotor of the stepping motor (16) is the second rotor.
If it is in the phase winding (32), it is the first phase winding (31) when the power is turned on.
By passing the excitation current of
You can move to 1) and move heads (13) and (14) to track zero. However, the rotor is the third phase winding (33)
In the case of, the rotor cannot be moved even if an exciting current is passed through the first phase winding (31). Therefore, in this embodiment, the control drive circuit (45) is configured to flow a current through the second phase winding (32) of the stepping motor (16) in response to the output pulse of the timer (44). . This allows the rotor to escape from the third phase winding (33), for example. It should be noted that while exciting the first phase, t ₁ -t _{2 is applied to} the third phase winding (33) or the fourth phase winding (34).
You may make a rotor escape from a 3rd phase by sending an electric current in.
Further, a current may flow from t ₂ to the first phase winding (31).

The line (52) derived from the stepping motor control drive circuit (45) is connected to the first phase transistor (3) of FIG.
When 5) is turned on, the same first phase excitation signal is supplied to the first input terminal of the AND gate (53). The step direction signal line (51) is connected to the second input terminal of the AND gate (53), and the output terminal of the retrigger monostable multivibrator (54) is connected to the third input terminal.

A first timer (44) and a step signal line (50) are connected to an input terminal of the retrigger monostable multivibrator (54). Therefore, the retriggered monostable multivibrator (54) is triggered in response to the trailing edge of the timer output pulse of FIG. 6 (B), that is, the conversion from high level to low level, and is shown in FIG. 6 (E). As shown, t _{2 to} t ₃ period (T ₂ = 50
generates an output pulse of high level ms), also a high level output during the period of t ₁₃ ~t ₁₅ in response to the trailing edge of each step pulse t ₁₃ ~t ₁₄ shown in FIG. 6 (D) Occur. In addition,
The step pulse is much shorter than 50ms, so it is retriggered within 50ms and trailing edge time t ₁₄ of the last step pulse.
To high level output from t ₈ to t ₁₅ after 50 ms.

In this disk device, the first-phase winding excitation signal is obtained on the line (52) in synchronization with the power-on, and the line (51) shows the step-out signal shown in FIG. 6C, that is, the head (13). ) (14) provides a high level signal to drive toward track zero. The step-out signal when the power is turned on is supplied from a controller (not shown). Meanwhile, retrigger monostable multivibrator (54)
Responds to the output of the timer (44) for the t ₂ to t ₃ period (T ₂ = m
s) generates a high level pulse. Therefore, during the period of t _{2 to} t ₃ , all the inputs of the AND gate (53) become high level, and the output thereof also becomes high level. As a result, the output of the first OR gate (46) becomes high level from t _{2 to} t _{3 as} shown in FIG. 6 (L), and eventually the transistor (39) is turned on. As a result, t ₁ to t ₃ (T ₃ = T ₁ + T ₂
= 62 ms), the two light emitting diodes (19) (20) emit light, and the track zero detection becomes possible.

In each of the phototransistors (20) and (22), the emitter is connected to the ground, and the + V bias power source is connected to the collector through the resistors (55) and (56). Therefore, the collector lines (57) (58) of the respective phototransistors (20) (22) are at a low level only when there is an optical input.
If the shading plate (18) is located between the light emitting diode (19) and the phototransistor (20) corresponding to the track zero position of the head (13) (14), the light emitting diode (19) is emitting light. However, since there is no light input to the phototransistor (20), its collector line (57) becomes high level. Therefore, the head line (13) is based on the high level of the collector line (57) of the phototransistor (20) even though the light emitting diode (19) is emitting light.
It can be detected that (14) is at track zero.

On the other hand, in the state where the cartridge (1) is loaded,
If light is input to the photodiode (22) during the light emitting period of the light emitting diode (21), the collector line (58) of the light emitting diode (22) becomes low level, which indicates that it is a write-protected cartridge. That is, it can be seen that the window (9a) is not closed by the lid (9b) due to write protection.

In order to detect the track zero and the write inhibit only during the light emitting period of the light emitting diodes (19) (21), five ANs are used.
D gate (59) (60) (61) (62) (63) and two NOT
Circuits (64) (65) and two RS flip flops (66)
(67) is provided.

One input terminal of the AND gate (59) is connected to the collector line (5
7) and the other input terminal is connected to the output terminal of the AND gate (63). By the way, AND gate (63)
One input terminal is connected to the output terminal of the delay circuit (48), and the other input terminal is connected to the output terminal of the OR gate (46). Therefore, as shown in FIG. 7, a high level output is obtained from the OR gate (46) to the period t _{1 to} t ₃ as shown in (M), and as shown in the delay circuit (48) to (N). t ₁
When a high level output is obtained in the period of d to t ₃ d, a high level output is obtained from the AND gate (63) in the period of t ₁ d to t ₃ shown in FIG. 7 (P). On the other hand, a high level output is obtained from the OR gate (47) in the period of t _{1 to} t ₃ d as shown in FIG. 7 (O). As a result, the high-level period of the light-emitting diode (19) (21) is driven to emit light by a period t ₁ ~t ₃ d AND gates than (63) becomes shorter. With this setting, even if there is a delay in the rise of the light emission of the light emitting diodes (19) and (21), the track zero detection and the write protection detection are performed during the complete light emission period t ₁ d to t ₃ . Can be done.

Now, assuming that the output line (57) of the phototransistor (20) for detecting the track zero becomes high level during the period of t ₁ to t _{3 in} FIG. 6 and the track zero of the head is detected, the AND gate (59). Generates a high level output indicating track zero detection within the period t ₁ d to t ₃ shown in FIG.
It is input to the set terminal of the flip-flop (66) and latched. As a result, a signal indicating the detection of track zero is sent from the Q output terminal of the flip-flop (66). The high-level Q output is not transmitted as it is, but is sent out in a low-level format via the NAND gate (68). That is,
This NAND gate (68) and the second flip-flop (6
Since the NAND gate (69) of the output line of 7) receives the drive select signal as an input, the low level output indicating the track zero is output only when the high level drive select signal is generated. , Which is sent to the host-side device. Also, light-emitting diodes (19)
Since the output of the AND gate (63) is at a low level during the period when is not emitting light, the output of the AND gate (59) is kept at a low level even if the line (57) is at a high level. .

The output terminal of the AND gate (60) is connected to the reset terminal of the flip-flop (66), and one input terminal of the AND gate (60) is connected to the collector line (5) via the NOT circuit (64).
7) and the other input terminal is connected to the output terminal of the AND gate (63), the output of the AND gate (63) is high level and the line (57) is low level. , The output of the AND gate (60) becomes high level, and the flip-flop (66) is reset. Therefore, when the track zero is not detected during the light emitting period of the light emitting diode (19), the flip-flop (66) is always reset.

One input terminal of the AND gate (61) in the write protection detection circuit is connected to the collector line (58) of the phototransistor (22) via the NOT circuit (65), and the other input terminal of the AND gate (63) is connected. It is connected to the output terminal.
Therefore, if the collector line (58) becomes low level while the light emitting diode (21) is emitting light, the AND gate (6
1) gives a high level write inhibit signal,
This is supplied to and held by the reset terminal of the flip-flop (67). Note that the output of the AND gate (63) is at a low level while the light emitting diode (21) is not emitting light, so even if the line (58) goes low,
The output of the D gate (61) is kept low. When the flip-flop (67) is set, a high level output is obtained from the Q output terminal, and a write inhibit signal is sent in a low level format to the host side device via the NAND gate (69). AND gate (62) on reset terminal of flip-flop (67)
Of the AND gate (62) is connected to the line (58) and the other input terminal is connected to the output terminal of the AND gate (63). The reset signal is supplied to the flip-flop (67) when the line (58) becomes high level during the period when the output of is high level.

It is necessary to detect whether the cartridge is a write-protected (fail protect) cartridge or not at least between the disk device and the ready signal generation. In FIG. 5, reference numeral (70) denotes a disk loading detection circuit, which includes the light emitting diode (23) and the phototransistor (24) shown in FIG. 3, and is loaded with the cartridge (1) including the disk (2). It is formed so as to generate a high level output as shown in FIG. 6 (F). The delay circuit (71) of T ₆ = 80 ms connected to the output line of the disk loading detection circuit (70) is for determining the time point t _{5 at} which the complete insertion state of the cartridge (1) is obtained, Fig. 6 (F)
The signal of is delayed by T ₆ = 80 ms and is output. The second timer (72) is triggered when the output of the delay circuit (71) rises from a low level to a high level, and outputs a high level pulse of T ₇ = 40 ms as shown in FIG. 6 (J). This is supplied to the OR gate (46). Therefore, even in this t _{5 to} t ₆ period, the light emitting diodes (19) (21) are lit,
The write protection and the track zero are detected.

(73) is an RS flip-flop, which is set by the output of the disk loading detection circuit (70) and is obtained from the ready detection circuit (30) shown in FIG. Is reset. As a result, Q output of the flip-flop (73), at t ₄ ~t ₉ period of Figure 6 goes high, which is the input of the OR gate (74). The other input of the OR gate (74) is connected to the motor on signal line (75). As a result, the sum signal of the high level output of the line a of FIG. 6 (G) to indicate t ₁₀ after a high level of motor on signal and t supplied from (75) ₄ ~t ₉ period of flip-flops (73) It is obtained at the output stage of the OR gate (74) as shown in FIG. 6 (H). The output of the OR gate (74) is used to drive the rotation of the disk rotation motor (12) via the motor drive circuit (76).
Rotates at t ₄ ~t ₉ period, and t ₁₀ after. The reason for rotating the disk (2) at the same time as loading the disk is to obtain a reliable mounted state of the disk (2) early. Even when the power-on detection signal is obtained while the cartridge (1) is inserted, it is synchronized with the power-on detection.
It is configured to rotate the disk (2) as with t ₄ ~t ₉ periods.

One input terminal of the AND gate (77) is connected to the output of the disk loading detection circuit (70), and the other input terminal is connected to the output terminal of the OR gate (74). Accordingly, the AND gate (77) of the AND gate (77) is operated only while the high level disk loading detection signal shown in FIG. 6 (F) is generated and the output of the OR gate (74) shown in FIG. 6 (H) is at the high level. The output goes high. In the case of the timing chart of FIG. 6,
The output state of the AND gate (77) matches the output state of the OR gate (74) in FIG. 6 (H). Delay circuit (78) is AN
This circuit delays the output of the D gate (77) by T ₄ = 320ms. That is, it determines the time point t ₇ 320 ms after the time point t _{4 and the} time point t ₁₁ 320 ms after the time point t ₁₀ . Delay circuit (7
The third timer (79) connected to the output of 8) is at time t ₇ when the output of the delay circuit (78) rises from the low level to the high level.
And t ₁₁ to generate a pulse of T ₅ = 100 ms as shown in FIG. 6 (K), which is supplied to the OR gate (46). Therefore, light emitting diodes (19) (21)
Also turned on at the t ₇ ~t ₈ period, and t ₁₁ ~t ₁₂ period. Thus, about 320 ms after the start of rotation of the disk (2), about 1
The reason why the light emitting diodes (19) and (21) are made to emit light for 00 ms is that it is necessary to detect the write-inhibited state when the rotation of the disk (2) is started and the cartridge (1) is stable.

As is apparent from the above, according to this embodiment, the following operational effects can be obtained.

(A) t ₁ to t ₃ , t _{5 to} t ₆ , t _{7 to} t ₈ , t _{11 to} t ₁₂ , in FIG.
Since the light emitting diodes (19) (21) only emit light in the period of t _{14 to} t ₁₅ , a significant power saving in the circuits of the light emitting diodes (19) (21) and the phototransistors (20) (22) is achieved. .

(B) Since the light emitting diodes (19) and (21) emit light in the period of t _{1 to} t ₃ , it is possible to surely detect the track zero when the power is turned on and the write inhibition when the disk is loaded. .

(C) Not only the period from t ₅ to t ₆ after loading the disk, but from t ₇ to
Since t _8, t ₁₁ ~t emitting diode (19) in ₁₂ periods (21) to emit light, it is possible to reliably detect a write-protected state.

(D) as shown in t ₁₃ ~t ₁₄ period, a step direction signal shown in FIG. 6 (C) to a high level state indicating step-out, as shown in FIG. 6 (D), the fourth phase phi _4, Third phase φ
₃ , the second phase φ ₂ and the first phase φ ₁ are excited in this order, and the head (1
3) Even when the (14) is moved to the track zero position, the light emitting diode (19) (21) remains in the period shown from t _{14 to} t _15.
Emits light, so it is possible to detect the track zero and latch it with the flip-flop (16).

(E) Light emitting time of the light emitting diodes (19) and (21) and AN
Since the relationship with the time to obtain the set or reset signal from the D gates (59) to (62) is set as shown in FIG. 7, the unstable period at the start and end of light emission of the light emitting diodes (19) (21) is Except for this, it is possible to detect a track example and a write protection.

(F) Light emitting diode for detecting zero track (19)
Since the light emission time of is not set by a special circuit, it is performed based on the AND gate (53) to which the first phase excitation signal and the step-out direction signal necessary for the track zero detection are input. Is getting easier.

(G) Since the light emitting diodes (19) and (21) are connected in series, the drive circuit is simplified.

Modifications The present invention is not limited to the above-described embodiments, and the following modifications are possible, for example.

(A) A driving circuit for the light emitting diodes (19) and (21) is provided independently, and the driving circuit for the light emitting diode (19) is supplied with the outputs of the timer (44) and the AND gate (53). The output of the timers (72) and (79) may be supplied to the drive circuit of (21).

(B) An optical input may be applied to the phototransistor (20) when the track is zero, and an optical input to the phototransistor (22) may be blocked when the write is prohibited.

(C) The output of only one of the timers (72) and (79) may be sent to the OR gate (46).

(D) Of course, it can be applied to an apparatus of the type in which the disk (2) is not rotated in the period of t ₄ to t ₉ in response to the disk loading.

(E) The present invention can be applied not only to the flexible magnetic disk device but also to a fixed magnetic disk device and various other disk devices. Further, it is also applicable to an apparatus using a cartridge which is generally called a mini floppy disk in which a magnetic disk is inserted in a flexible case.

[Brief description of drawings]

1 to 7 are for explaining a magnetic disk device according to an embodiment of the present invention. FIG. 1 is a plan view of a magnetic disk cartridge, and FIG. 2 is a bottom surface of the cartridge of FIG. 3 and 4 are front views showing principal parts of the magnetic disk device in principle, FIG. 4 is a circuit diagram showing a stepping motor and its drive circuit, and FIG. 5 is a block diagram showing an electric circuit part of the magnetic disk device. Figures 5, 6 and 7 are the fifth
It is a wave form diagram which shows the state of A-P point of a figure. (1) …… Cartridge, (2) …… Magnetic disk,
(3) …… Case, (9) …… Write-protected detected part,
(9a) …… Window, (9b) …… Lid, (12) …… Disk rotation motor, (13) (14) …… Magnetic head, (16) …… Stepping motor, (19) …… Track Zero-detecting light-emitting diode, (20) …… Track zero-detecting phototransistor, (21) …… Write-protection detecting light-emitting diode,
(22) …… Phototransistor for detecting write protection, (3
9) ... Switching transistor, (44) ... first timer, (72) ... second timer.

Front Page Continuation (72) Inventor Shozo Toma 3-7-3 Nakamachi, Musashino-shi, Tokyo Within TAITSUKU Co., Ltd. (72) Inventor Kazuhiro Hiraki 3-7-3 Nakamachi, Musashino-shi, Tokyo TAI ATSK Co., Ltd. In (72) Inventor Tsutomu Morita 3-7-3 Nakamachi, Musashino-shi, Tokyo Inside Tetsuku Co., Ltd. (56) Reference JP-A-59-139174 (JP, A)

Claims (1)

[Claims] 1. A disc cartridge in which a recording medium disc is housed in a case, and a write-inhibited detection portion is provided in the case for optically determining whether or not writing of information to the disc is prohibited. A device for converting information by using the disk rotating mechanism for rotating the disk, a converter for converting information between the disk while the disk is rotating, and the converter. A converter moving mechanism for moving the disk in the track crossing direction of the disk, and for optically detecting the write-inhibited detected portion,
A write-protection detecting light-emitting element arranged so as to correspond to the write-inhibition detected portion in a state where the cartridge is normally loaded in the rotation mechanism, and corresponds to the light-emitting element for detecting the write-inhibition detected portion. A light-receiving element arranged, a switch connected to a power line of the light-emitting element to selectively cause the light-emitting element to emit light, and a ready-to-use disk that is in a substantially normal rotation state from the start of rotational driving of the disk. A switch control circuit for controlling the switch so that the light emitting element is caused to emit light for a predetermined period set within a period until the time point and the light emission of the light emitting element is stopped at the end point of the predetermined period. Disk device.