JPH04137289A - Disk cartridge - Google Patents

Abstract

PURPOSE:To detect the accurate temperature of the cartridge and to perform the best recording, reproduction, and erasure by providing a sensor for temperature detection which detects the temperature of the cartridge. CONSTITUTION:The cartridge 2 is provided with the temperature detecting sensor 6 which detects the temperature of the cartridge 2. This temperature detecting sensor 6 is embedded in the plate thickness of a lower half 2b, the sensor main body is exposed neither inside nor outside the cartridge 2, and a disk 1 stored in the cartridge 2 is prevented from damaging. Consequently, the accurate temperature of the recording medium 1 can be detected and the recording and/or reproduction is performed under the best conditions according to the detection result.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge in which an optical disk, a magneto-optical disk, etc. is rotatably housed in the cartridge.

[Summary of the invention]

The present invention detects the accurate temperature of a recording medium in a disk cartridge in which an optical disk, a magneto-optical disk, etc. is rotatably housed in the cartridge, by providing the cartridge with a temperature detection sensor that detects the temperature of the cartridge. This is what I am trying to do.

[Conventional technology]

In recording media on which information signals can be written or read, or both written and read, by optical or magneto-optical means, the temperature of the medium during writing or continuous output may be too high for recording or reproducing. The temperature of this medium is extremely important as it affects

For example, in a magneto-optical disk, the recording thin film expands and contracts depending on temperature conditions, so the signal writing or erasing position of the magnetic head that applies a magnetic field to the recording thin film may shift, which may cause accurate information signals to be lost. In some cases, writing and erasing cannot be performed.

Furthermore, in magneto-optical disks, when recording and erasing, it is necessary to raise the temperature of the recording thin film above the Curie point, which requires high laser power, and when reproducing, a relatively low laser power is required, which does not demagnetize the recorded information. Power is required. Therefore, it is necessary to set these laser powers in consideration of the temperature of the recording medium to enable optimal recording and reproduction. For example, even if the laser power during recording is optimal at a certain temperature of the recording medium, the laser power during recording may be too low or too high due to changes in the temperature of the medium, and good magnetization reversal cannot be achieved. There is. Similarly, if the laser power during reproduction or erasing is too large or too small, recorded information signals may be demagnetized or unerased portions may be left behind.

On the other hand, for optical discs, the temperature during recording is particularly important, and if the optimum temperature during recording changes even slightly, the size of the pits may change.

For this reason, conventionally, a temperature detection sensor is provided in a drive device in which a disk cartridge is installed and writes and/or reads information signals to a recording medium stored in the cartridge, and the sensor detects the temperature inside the drive. However, based on this detection result, the position of the magnetic head and the laser power have been controlled.

However, since there is a difference between the temperature inside the drive and the temperature of the recording medium stored in the cartridge, it is not possible to accurately control the magnetic head position and laser power as described above.

For example, for an optical disc, if the optimum temperature during recording is 180°C, and the temperature inside the drive is 50°C1 and the temperature of the recording medium is 30°C, then the temperature inside the drive is 50°C. Since the laser power is controlled based on the temperature, the optimum temperature becomes too low, making stable recording impossible.

Therefore, further conventionally, as shown in FIG. 7, a temperature detection sensor (53) is provided on a chassis (51) provided in a drive device via a coil spring (52), and a disk cartridge (54) is A device has been proposed in which the temperature of the disk cartridge (54) is detected by bringing the disk cartridge (54) into contact with the sensor (53) when it is loaded.

However, since many commercially available sensors (53) have a cylindrical or spherical shape, the contact portion between the disk cartridge (54) and the sensor (53) is a line contact or a point contact. Accurate temperature detection cannot be expected.

[Invention or problem to be solved]

Therefore, the present invention has been proposed in view of the conventional situation, and provides a disk cartridge that can accurately detect the temperature of a recording medium and perform recording and/or playback under optimal conditions according to the detection result. The purpose is to provide.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a cartridge rotatably housing a disc-shaped recording medium on which a recording layer is formed on a substrate and on which information signals can be written and/or read. The cartridge is provided with a temperature detection sensor for detecting the temperature of the cartridge.

[Effect]

In the disk cartridge according to the present invention, since the cartridge is provided with a temperature detection sensor for detecting the temperature of the cartridge, it is possible to accurately detect the temperature of the cartridge, unlike a sensor that detects the temperature by bringing the sensor into contact with the cartridge. is detected.

〔Example〕

Hereinafter, specific examples to which the present invention is applied will be described.

As shown in FIG. 1, the disk cartridge of this embodiment is a disk that is a disk-shaped recording medium on which a recording layer is formed on a substrate and on which information signals can be written, read, or both written and read. (1) and a cartridge (2) that rotatably accommodates the disk (1).

The disk (1) has a recording layer on at least one surface, such as an optical disk or a magneto-optical disk, and an emotional signal can be written or read on this recording layer by optical or magneto-optical means. Alternatively, both writing and reading may be performed. A chucking hub portion (1a) for chucking the disk (1) onto a disk table provided in a recording and/or reproducing device is provided at the center of the disk (1).

The cartridge (2) is comprised of a planar rectangular casing, ie, an upper half (2a) and a lower half (2b), which are large enough to accommodate the disc (1) inside. These upper half (2a) and lower half (2a)
Both of b) are made of the same polycarbonate resin as the substrate of the disk (1), and when these are butted against each other and combined, the cartridge (2) is constructed. The disk (1) is rotatably housed in the cartridge (2) configured as described above.

In addition, the upper half (2a) and the lower half (2b) include
Elongated hole-shaped openings (3a) and (3b) extending from the negative side edge of the cartridge (2), that is, the side edge in the insertion direction when installed in a recording and/or playback device, to the center thereof, respectively, are opposite to each other. It is provided. Therefore, these openings (3
a) and (3b) to connect the disk (1) housed in the cartridge (2) and the chucking hub part (l).
a) are arranged so as to face outward over their inner and outer circumferences. The lower half (2b) is provided with positioning holes (4a) and (4b) into which positioning pins provided on the drive device are inserted when the disk cartridge is loaded into the drive device.

The cartridge (2) also has an opening (3a) which is movable relative to the cartridge (2).
(3b) A shutter member (5) that can be opened and closed is also provided. The shutter member (5) is a thin plate made of a material such as metal or synthetic resin, or the cartridge (5) is a thin plate made of a material such as metal or synthetic resin.
It is bent into a substantially U-shape so as to sandwich the front side portion of 2) from above and below.

That is, this shutter member (5) is attached to the upper half (
The upper plate part (5a) facing the main surface of 2a) and the lower half (5a)
2b), and a front plate part (5b) that connects the upper plate part (5a) and the lower plate part (5b).
C).

The shutter member (5) is supported by a front plate portion (5c) or a front end portion of the cartridge (2), and is moved from one side to the other side along the front end portion. It is made movable in the direction of arrow A in the figure over the position. In addition, this shutter member (5) is elastically biased by a torsion coil spring (not shown) provided in the cartridge (2) when the shutter member (5) is not attached to a recording and/or reproducing device. and closes the openings (3a) and (3b). Therefore, under normal conditions, the shutter member (5) prevents dust from entering the cartridge (2), and also protects the disk (1) from unexpected external forces.

In the disk cartridge of this embodiment,
The cartridge (2) is provided with a temperature detection sensor (6) for detecting the temperature of the cartridge (2). The temperature detection sensor (6) is shown in FIGS. 2 and 3.
As shown in the figure, it is embedded within the plate thickness at the bottom near the negative edge of the lower half (2b). Since this temperature detection sensor (6) is extremely small, it is embedded within the thickness of the thin lower half (2b), so that the sensor body is not exposed inside or outside the cartridge (2). .

Therefore, in the temperature detection sensor (6),
Unlike the conventional method in which temperature is detected by contacting a sensor with the cartridge (2), accurate temperature detection can be expected regardless of whether the contact condition is good or bad.

In addition, since the temperature detection sensor (6) is not exposed inside or outside of the cartridge (2), the cartridge (2)
Damage to the disc (1) housed within is prevented. The temperature detection sensor (6) can be embedded in the lower half (2b) by inserting it into a predetermined position when injection molding the lower half (2b).

and a terminal (6a) of the temperature detection sensor (6).

(6b) is provided at a position facing the connection terminal provided on the recording and/or reproducing device side, and the lower half (2b)
) is exposed on the outer peripheral surface. In this example, the terminals (6a) and (6b) are pin jacks such as those used in audio equipment.

When the disc cartridge thus configured is loaded into a recording and/or reproducing apparatus, the temperature of the cartridge (2) is detected instantaneously.

That is, as shown in FIG. 4, when the disk cartridge is loaded into a recording and/or reproducing device, the height reference pin (8) and the positioning pin ( 9), the cartridge (2) is supported parallel to the chassis (7) and positioned in the main body of the apparatus. At the same time, the chucking hub portion (1a) of the disk (1) housed in the cartridge (2) is chucked at the tip of the spindle motor (1o) provided on the chassis (7), and the The disk (1) is lifted and rotatably supported.

With the disc cartridge loaded in this way, connect the connection terminal (1) provided on the chassis (7).
1), the terminals (6a) and (6b) of the temperature detection sensor (6) built into the lower half (2b) come into contact.

That is, at the same time as the loading of the disk cartridge is completed, the terminal (6a) of the temperature detection sensor (6)
, (6b) comes into contact with a connecting terminal (11) provided on the chassis (7), and the temperature of the cartridge (2) is instantaneously detected. The temperature detected at this time is
Since it is made of the same material as the substrate of either the cartridge (2) or the disk (1), the temperature is approximately the same as that of the disk (1). In other words, by detecting the temperature of the cartridge (2), the actual temperature of the disk (1) at that time can be detected.

The temperature information detected as described above is sent to the central processing unit (12) which is provided with a circuit for controlling the laser power connected to the connection terminal (11), and is sent to the central processing unit (12) connected to the connection terminal (11). Based on the detection results from the sensor (6), the laser beam irradiated onto the disk (1) is set to the optimum power required during recording and erasing.

For example, to explain the case of writing information signals to a magneto-optical disk, a magnetic head (14) is placed between the disk (1) and facing an objective lens (13).
Applying a bias magnetic field to the disk (1),
At the same time, the laser beam from the semiconductor laser (15) is passed through the collimator lens (16) and the beam shaping prism (17).
) and a polarizing beam splitter (18), and is imaged as a minute spot on the recording area of the disk (1) by an objective lens (I3).

At this time, the laser beam is transmitted to the temperature detection sensor (6).
) (Thus, based on the detected temperature of the cartridge (2), that is, the temperature of the disk (1), the central processing unit (
12) and output as the optimum power required during recording. In the past, stable writing of information signals was possible. Of course, even if the temperature of the medium changes depending on the recording area of this disk (1), the temperature in the cartridge (2) at that time will be detected by the temperature detection sensor (6), and this temperature change will be detected by the temperature detection sensor (6). It is output as the optimum power for recording based on the power output.

Similarly, when erasing, the laser that is set to the optimum laser power according to the temperature of the disk (1) is always used to erase the disk (1).
Since the information signal is irradiated onto the recording surface of the recording surface, there will be no unerased areas, and the information signal can be erased in a good manner.

Similarly, in the case of optical discs, the optimal laser power required during recording and reading is output according to changes in the temperature of the disc, so there is no fluctuation in the pit size, and stable laser power is output. Recording and playback are possible.

As described above, in the embodiment to which the present invention is applied, the laser power is controlled based on the result of detecting the temperature of the disk cartridge (2), or the recording signal of the magnetic head (14) is controlled based on the result of this detection. It is also possible to control the reading position. In particular, in this case, a sensor for detecting the temperature inside the recording and/or reproducing device is separately provided,
The magnetic head (14) may be positioned based on the difference between this sensor and the temperature detection sensor (6) that detects the temperature of the cartridge (2) described above.

Further, in the above-described embodiment, the temperature detection sensor (6) and the terminals (6a) from the temperature detection sensor (6), (6
b) is provided on the lower half (2b), or for example, as shown in Figures 5 and 6, the temperature detection sensor (6
) and a terminal (6a) from this temperature detection sensor (6).

(6b) may be provided on the upper half (2a).

That is, in FIG. 5, the temperature detection sensor (6) is built into the upper half (2a), and the terminals (6a) and (6b) of the temperature detection sensor (6) are provided in the upper half (2a). The rib (19) is guided to the tip of the rib (19). Then, a connecting terminal (20a) is connected to the positioning pin (9) provided on the string (7) with these terminals (6a) and (6b).
, (20b), and by bringing this positioning pin (9) into contact with the rib (19) during loading, these terminals (6a), (6a) and the connecting terminal (2
0a) and (20b) are brought into contact.

On the other hand, in FIG. 6, the tip of the positioning bottle (9) is extended, and the tip of the positioning bottle (9) is brought into contact with the inner surface of the upper half (2a) to detect the temperature built in the upper half (2a). The terminals (6a), (6b) of the sensor (6) and the connection terminals (20a), (20a) built into the positioning bin (9)
0b).

In addition, the temperature detection sensor (6) is connected to the upper half (2a
), and the terminal (6a) of the temperature detection sensor (6)
, (6b) can also be provided on the lower half (2b). In any case, make sure that the connection terminals (11), (20a), (20b) provided on the recording and/or playback device side are connected to the terminals (6a), (6b) of the temperature detection sensor (6) in a position where they can be reliably connected. If there are, these temperature detection sensors (6) and the terminals (6a) of this temperature detection sensor (6),
(6b) Location and connection terminal (11) provided on the device side
, (20a), (20b) The positions are not limited.

Furthermore, the temperature detection sensor (6) is not embedded in the upper half (2a) or the lower half (2b), but is attached to the inner surface of the upper half (2a) or the lower half (2b). You can do it like this. Of course, in this case, the temperature detection sensor (20) or the cartridge (
2) It goes without saying that it is necessary to provide it at a location that does not come into contact with the disc (1) housed in the disc (1).

〔Effect of the invention〕

As is clear from the above description, in the disk cartridge according to the present invention, since the cartridge is provided with a temperature detection sensor for detecting the temperature of the cartridge, unlike the case where a sensor is brought into contact with the cartridge, Can detect exact cartridge temperature.

Therefore, by controlling the optimal laser power required for recording, playback, and erasing based on the result of detecting the temperature of this cartridge, stable information signal recording and
You can play and delete.

Furthermore, in the case of a magneto-optical disk, accurate head positioning can be achieved by controlling the reading position of the recording signal of the magnetic head based on the detected temperature of the cartridge.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a disk cartridge to which the present invention is applied, FIG. 2 is an enlarged perspective view of the main part at a position where a temperature detection sensor is provided, and FIG. 3 is an enlarged cross-sectional view of the disk cartridge. FIG. 4 is a schematic diagram showing a state in which a disc cartridge to which the present invention is applied is installed in a recording and/or reproducing apparatus. FIGS. 5 and 6 are enlarged sectional views of main parts showing other examples of the arrangement position of the temperature detection sensor. FIG. 7 is a schematic diagram showing a conventional method of detecting the temperature of a disk cartridge by bringing a temperature detection sensor into contact with the disk cartridge. l... Disk 2... Cartridge 2a... Upper half 2b. 6... 6a. 11°...Lower half/Temperature detection sensor 6b...Terminals 20a, 20b...Connection terminals

Claims (1)

[Claims] A temperature detection sensor for detecting the temperature of the cartridge, comprising a cartridge rotatably housing a disc-shaped recording medium on which a recording layer is formed on a substrate and on which information signals can be written and/or read. A disc cartridge that is equipped with.