JPH0636544A - Optical disk driving and optical disk cartridge - Google Patents

Abstract

PURPOSE:To prevent the fault by frost condensation by detecting the generation of the frost condensation or previously detecting the high probability of the generation thereof. CONSTITUTION:A microcomputer 20 detects the difference between the outputs of temp. sensors 11, 12 which respectively detect the ambient temp. and the temp. in the housing of an optical pickup. The operation of an LD control circuit 21 is stopped to prevent a laser diode 6 from emitting light when the ambient temp. is higher and the output difference exceeds the preset threshold value. A power source is otherwise turned off by a power source cut off circuit 22 to prevent a reckless run or a heater 10 is turned on by a heater power source 23 to raise the temp. in the housing. A loading motor 25 of an auto- loading mechanism is otherwise operated by a motor controller 24 to discharge the optical disk cartridge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive device and an optical disk cartridge, and more particularly to an optical disk drive device and an optical disk cartridge which prevent a trouble caused by dew condensation.

[0002]

2. Description of the Related Art Optical discs in the narrow sense in which information is recorded on a removable disc-shaped recording medium as a difference in reflectance, that is, light and shade, and a magneto-optical disc in which information is recorded as a change in the direction of a vertical magnetic field are used. For example, a CD (compact disc) that is stored in a cartridge, or is pre-recorded as pits (fine irregularities) for reproduction only.
There are those without a cartridge such as a CD-ROM and a CD-ROM, but in this specification, these are collectively referred to as an "optical disc".

The optical disk drive device uses an optical pickup having a light emitting element such as an LD (laser diode) as a light source and a complicated optical system and a light receiving element as a function to record information on an optical disk or recorded information. There are a recordable / reproducible type that reproduces a record and a read-only type such as a player. In addition, there are devices that are assembled as part of the host machine and devices that are connected to the host machine by cables as independent external devices.

Since optical discs have become smaller and smaller with the increase in recording density, and the optical disc drive devices have become smaller, thinner, and lighter accordingly, desktops such as conventional personal computers (word processors) and word processors (word processors) have become. Not only type OA devices but also portable OA devices such as so-called notebook computers and note word processors.

What has become a problem here is an obstacle due to dew condensation. Even in desk-top OA equipment, there was some condensation due to heating or an increase in the number of people, such as in the cold morning, but the temperature and humidity change gradually, so there is almost no major obstacle. It was However, in the case of a portable OA device, when it is brought into a warm room from a cold outdoor, the temperature and humidity change abruptly, so that dew condensation becomes a serious problem.

Since the optical disk drive device originally records / reproduces information by laser light,
When dew condensation occurs on the surface of a light emitting element such as an LD, an optical element such as a mirror, a lens, a prism, or a light receiving element such as a photodiode or phototransistor, or the surface of an optical disk, light is scattered and the light utilization efficiency is increased. May be deteriorated or the image may be blurred, which may result in erroneous recording or reproduction or may be impossible at all.

Moreover, since the dew condensation that causes such a serious trouble occurs inside the optical disk drive device, particularly inside the optical pickup housed in the housing to prevent the entry of fine dust, the operator should be aware of it. Absent. Furthermore, since a particularly large current flows through the LD during recording, there is a risk of destroying the LD, its drive circuit element, or other circuit elements when short-circuited due to dew condensation.

Therefore, for example, JP-A-61-269946
As disclosed in Japanese Patent Laid-Open No. Hei 3-232156 and Japanese Patent Laid-Open No. 3-232156, there is a proposal of rotating a fan when dew condensation is detected, and removing the dew condensation as quickly as possible. As disclosed in Japanese Patent No. 236116, there has been a proposal to delay the power-on until the power supply to each circuit is stopped or removed when dew condensation is detected.

Further, as disclosed in Japanese Patent Application Laid-Open No. 1-40922, a proposal for hermetically maintaining an optical system or the like in a vacuum or a dry state, or Japanese Patent Application Laid-Open Nos. 63-260354 and 63-63. As shown in Japanese Patent No. 300434,
Many proposals have been made, such as a proposal for determining the presence or absence of dew condensation in the optical system based on the difference between the pattern image information of the non-condensing optical system and the pattern image information of the practical optical system.

[0010]

However, the proposals for removing the dew condensation by rotating the fan and the proposals for stopping or delaying the power supply are to take measures after detecting the occurrence of the dew condensation. It was impossible to predict it and take measures before it occurred. Therefore, for example, if you bring it from a cold outdoor into a warm room and start to use it immediately, the warm, moist air will enter the housing of the optical pickup until condensation occurs on the surface of the light emitting element, the light receiving element or the optical element. Since it takes time, there is a problem that it suddenly becomes unusable during work.

Although the proposal for sealing the optical system and the like is effective for other types of equipment, optical discs that are in direct contact with air,
It is impossible to seal the objective lens of an optical pickup that is servo-driven for focusing or tracking at a position extremely close to the optical disk surface. Further, although the proposal of determining the presence or absence of dew condensation by comparing the information of the pattern images and the like is excellent in terms of effect, it is complicated and costly as the dew condensation detecting means.

Further, as described above, many proposals have been made for the condensation of the optical system of the optical pickup, but no proposal has been made for the condensation of the optical disk surface which should be treated in the same way. . Although it is perfectly open like a CD, in most cases, even if a part of the optical disk built into the cartridge can be seen through the window, it will be installed in the optical disk drive without paying special attention. Therefore, we cannot ignore the obstacles caused by dew condensation.

The present invention has been made in view of the above points, and it is possible to prevent the occurrence of dew in an optical disk drive device and an optical disk cartridge by detecting the occurrence or high possibility of dew condensation in advance. With the goal.

[0014]

In order to achieve the above-mentioned object, the present invention is an optical disc drive apparatus for recording information on an optical disc or reproducing the information recorded on the optical disc by an optical pickup having a light source and an optical element group. ,
Alternatively, in an optical disc drive device having an auto loading mechanism for automatically mounting and ejecting an optical disc cartridge containing an optical disc, a first temperature sensor for detecting an ambient temperature and a first temperature sensor for detecting a temperature in a housing of an optical pickup are provided. The second temperature sensor and the output difference detecting means for detecting the difference between the outputs of the first and second temperature sensors are provided, and are further configured as follows.

That is, when the temperature detected by the first temperature sensor is higher than the temperature detected by the second temperature sensor and the output difference exceeds a preset limit value, the operation of the light source drive circuit for driving the light source is stopped. Means are provided. Alternatively, there is provided means for turning off the power supply or drive circuit in the device when the temperature detected by the first temperature sensor is higher than the temperature detected by the second temperature sensor and the output difference exceeds a preset limit value. It is a thing.

Alternatively, the heating means for raising the temperature inside the housing of the optical pickup by being energized and the temperature detected by the first temperature sensor are higher than the temperature detected by the second temperature sensor and the output difference is large. When a preset limit value is exceeded, a means for energizing the heating means until the output difference becomes equal to or less than the threshold value set to a value smaller than the limit value is provided. Alternatively, when the temperature detected by the first temperature sensor is higher than the temperature detected by the second temperature sensor and the output difference exceeds a preset limit value, means for ejecting the optical disk cartridge by the auto loading mechanism is provided. is there.

Further, in an optical disk cartridge having an optical disk built in the cartridge case, a dew condensation sensor for detecting dew condensation in the cartridge case and a terminal arranged outside the cartridge case and connected to the dew condensation sensor are provided to provide an optical disk drive device. The above terminals are connected to the terminals on the side of the optical disk drive when mounted. The above-mentioned dew condensation sensor may be formed by arranging a pair of conductive members made of copper foil or the like on an insulating substrate so as to be adjacent to each other with a minute gap therebetween, and forming a concavo-convex shape in which the adjacent portions are intertwined with each other.

[0018]

In the optical disk drive device configured as described above, the first temperature sensor detects the ambient temperature, the second temperature sensor detects the temperature inside the housing of the optical pickup, and the output difference detection means operates as the first temperature sensor. The output difference between the first and second temperature sensors is detected. When the temperature detected by the first temperature sensor (ambient temperature) is higher than the temperature detected by the second temperature sensor (temperature inside the housing) and the output difference exceeds the limit value,
It turns out that dew condensation has occurred or is likely to occur soon.

In such a case, the respective units operate independently or as a set, and in some cases, the operation of the light source drive circuit is stopped to prevent a trouble caused in the light source or the light source drive circuit due to dew condensation. Alternatively, by turning off the power supply or drive circuit in the optical disc drive device,
Prevent trouble such as runaway caused by dew condensation.

Alternatively, the heating means is energized to raise the temperature in the housing so that the output difference becomes less than or equal to the threshold value, that is, the temperature difference between the temperature in the housing and the ambient temperature is reduced to the extent that dew condensation does not occur. Alternatively, since the optical disc cartridge is ejected by the auto loading mechanism, malfunction is prevented and the operator immediately notices the occurrence or possibility of dew condensation.

Further, in the optical disk cartridge constructed as described above, since both terminals are connected when mounted in the optical disk drive device, the dew condensation sensor is connected to the main body of the optical disk drive device and whether or not there is dew condensation in the cartridge case. To the main unit side. Therefore, the main body of the optical disk drive device can take measures such as ejecting the optical disk cartridge having the dew condensation. If the dew condensation sensor is configured as described above, a compact and highly sensitive sensor that can be easily arranged in the cartridge case can be obtained at low cost.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an optical disk drive device (hereinafter simply referred to as "disk driver") which is an embodiment of the present invention.
2 is a configuration diagram showing a main part of FIG. 2, and FIG. 2 is a circuit diagram showing an example of a control system of the disk driver shown in FIG.

The disk driver 1 shown in FIG. 1 has an optical pickup 4 housed in a front panel 2 and a housing 3, and an optical disk cartridge (hereinafter simply referred to as a "cartridge") containing an optical disk (not shown). It is composed of an auto loading mechanism for ejecting and a disc rotating mechanism for supporting and rotating the optical disc.

The optical pickup 4 is a light source housed in a housing 5 and is an LD which is a semiconductor light emitting element.
(Laser diode) 6, objective lens 7 for focusing the laser beam output from LD 6 on the optical disk, light receiving elements not shown below, various lenses, prisms, mirrors, beam splitters, quarter wave plate And the like, and an objective lens driving mechanism for servo-driving the objective lens 7 for focusing and tracking.

The operation of a normal disk driver is well known, and will be briefly described below. The operator inserts the tip of the cartridge into the window 2a of the front panel 2.
Then, the auto loading mechanism operates to take in the cartridge and set the optical disc in the disc rotating mechanism. When the disk rotating mechanism rotates the optical disk at a constant speed, the optical pickup 4 moves on a rail 8 provided in the radial direction of the optical disk to find a desired track on the surface of the optical disk, and the LD 6 outputs it by the objective lens 7. The spot of the laser beam is imaged on the track.

At the time of recording, information is recorded by the thermal action of a strong laser beam (in cooperation with a magnetic field in a magneto-optical disk), and at the time of reproduction, a weak laser beam which does not destroy the recorded information is irradiated and reflected. Information is reproduced by changes in light. When the recording or reproducing of information is completed, the rotation of the optical disc is stopped in response to a command from the host machine or the operator, and then the auto-loading mechanism removes the optical disc from the disc rotating mechanism, and the cartridge is moved to the window portion 2.
Discharge from a.

In this embodiment, the heater 10 is further added.
And a temperature sensor 11 including a temperature sensitive element such as a thermistor,
And 12 are provided. That is, the front panel 2
A first temperature sensor 11 for detecting an ambient temperature (outside air temperature or indoor temperature) is provided in a part of the above, and a second temperature sensor 11 is provided in the housing 5 of the optical pickup 4 for detecting a temperature in the housing 5 near the LD 6, for example. Temperature sensor 12 and housing 5
A heater 10, which is a heating means for raising the internal temperature, is provided.

The control system of the disk driver 1 shown in FIG. 2 is a microcomputer 2 for data processing and control.
0, the temperature sensors 11 and 12 that output signals (temperature information) to the microcomputer 20, and the LD control circuit that is a light source drive circuit that drives the LD 6 controlled by the microcomputer 20 and controls the laser power to be output. 21, a power supply cut-off circuit 22 that is a means for turning off the power supply of the drive circuit of the mechanical section, for example, a power source of the drive unit of the mechanism section in which troubles due to all power sources in the disk driver 1 or preset condensation easily occur, and on / off control of the heater 10. And a motor controller 24 that controls the operation of a loading motor 25 that is the power source of the autoloading mechanism.

The microcomputer 20 is an output difference detecting means for inputting the signals output from the first and second temperature sensors 11 and 12 and detecting the output difference, and the output difference is stored in the ROM in advance. It is also a means for comparing with the limit value or the threshold value and determining whether the value exceeds the limit value or becomes equal to or less than the threshold value.

The signals output by the temperature sensors 11 and 12 are
Depending on the characteristics of the sensor and the configuration of the output circuit, the level does not always increase at high temperatures, and the polarity cannot be determined as positive or negative. However, in this embodiment, the temperature detected by the first temperature sensor 11 (ambient temperature) is Second temperature sensor 1
It is assumed that the output difference becomes positive when the detected temperature is higher than the detected temperature of 2 (the temperature inside the housing).

Further, the microcomputer 20 is means for stopping the operation of the LD control circuit 21 (light source drive circuit) when the output difference exceeds the limit value, and turns off the power supply or drive circuit together with the power supply cutoff circuit 22. It also functions as a means for supplying electricity to the heater 10 (heat generating means) together with the heater power supply 23, and also serves as means for discharging the cartridge together with the motor controller 24.

As described above, for example, when a portable OA device that has been completely cold outside is brought into a warm room,
The outer case that is exposed to the warm and humid air immediately condenses, but generally, the outer case formed of a plastic having a low thermal conductivity has a small amount of dew condensation, so that it is often not noticeable at first glance.

On the contrary, the part of the outer case, particularly the part housed in the housing 5 of the optical pickup 4, does not immediately come into contact with the air in the room, so that there is no dew condensation for a while, but at the same time the temperature remains cold. is there. Therefore, when warm and moist air gradually enters the inside of the housing 5, dew condensation occurs. Condensation first occurs in the metal part with high thermal conductivity, so the LD and light receiving element housed in the metal case are the first, then the optical element and window made of glass, and finally the optic made of plastic. Condensation occurs in the order of elements and members.

Since the first temperature sensor 11 is provided on the front panel 12 having the window 2a opened to the outside of the OA equipment, it responds quickly to the ambient temperature, while the second temperature sensor 12 is Since it is provided in the housing 5 where there is a slight time lag until it becomes the same as the ambient temperature, it does not respond immediately. Therefore, there is almost no output difference when the ambient temperature changes slowly, but a large output difference is obtained when the ambient temperature changes suddenly.

Condensation does not occur when the ambient temperature changes slowly, and moisture in the housing gradually leaks even when the ambient temperature suddenly drops, so that condensation does not easily occur in the housing. That is, the dew condensation becomes a problem when the ambient temperature rises to a certain degree, though it depends on the humidity of the ambient air.

Therefore, when the ambient temperature rises sharply, the microcomputer 20 causes the first and second temperature sensors 1 to
The output difference between 1 and 12 is detected, and the output difference showing a large value is compared with the limit value stored in the ROM. When the output difference exceeds the limit value, the microcomputer 20 determines that dew condensation has occurred or has a high possibility of dew condensation, and prevents the following dew condensation-induced troubles or removes dew condensation that has occurred in advance. The processing to be performed, the processing for preventing the failure and the warning for the operator, and the like are performed individually or in combination.

One of the fault prevention processes is the LD control circuit 21.
That is, the operation of (3) is stopped, that is, the drive current is not output to the LD 6. Since the LD 6 is housed in the metal case together with the light receiving element, it is one of the earliest dew condensation items. Condensation of the window through which the laser beam passes is also a problem, but if dew condensation occurs on the metal case and shorts between the lead wires, a large current flows, especially during recording with a high laser power, and therefore a light emitting chip of the LD 6 and a large drive current are output. To L
The output transistor of the D control circuit 21 may be destroyed. Such an unrecoverable failure is caused by the LD control circuit 21.
This can be prevented by stopping the operation of.

Another one of the failure prevention processing is to turn off the power supply in the disk driver 1. This allows
It is possible to prevent not only the LD control circuit 21 but also the runaway of the mechanical portion due to the malfunction of the drive circuit. When all the power supplies are turned off and the dew condensation is eliminated or the possibility cannot be recovered without the operator's operation when the possibility disappears, it suffices to selectively turn off the drive circuit which is apt to cause a failure due to the dew condensation.

The process of preventing dew condensation or removing the generated dew is to energize the heater 10 by the heater power supply 23 to raise the temperature in the housing 5. If it does so, it does not condense dew condensation like the LD6 and the optical element, and if dew condensation has already occurred because the OA device was brought into the room and the power was not turned on for a while, for example. Can be promptly removed.

When the heater 10 is energized to increase the temperature in the housing 5 and the difference between the outputs of the temperature sensors 11 and 12 is reduced to the threshold value or less like the threshold value stored in the ROM, dew condensation is removed. Alternatively, it is determined that the possibility has disappeared, and the energization of the heater 10 is stopped. At this time, the operation of the LD control circuit 21 may be stopped or the power off may be released in parallel.

The process of preventing troubles due to dew condensation and giving a warning to the operator is to eject the cartridge by the auto loading mechanism. When the cartridge is ejected, neither the optical pickup nor the other circuits and mechanisms operate, so that the trouble due to dew condensation is completely prevented. Further, the operator can be alerted more easily than the dew condensation warning is displayed as a message or a sound is issued.

Although it has been proposed that some of the processes described above are operated in combination with a dew condensation sensor to detect dew condensation, there is a slight delay between the occurrence of dew condensation and the detection and processing. Because of this, it was not possible to prevent the obstacles that would occur during that time. Further, even if the OA device is brought into the room, dew condensation in the housing does not occur immediately, so that there is a problem that the OA device suddenly stops while the power switch is turned on to perform the work.

In this embodiment, each process is combined with a temperature sensor to detect the possibility that dew condensation is likely to occur and perform each process, so that any trouble can be prevented. It is great in what it can do. Even if dew condensation has already occurred, each process is executed when the power switch is turned on, so there is no possibility of information being destroyed by sudden stop after entering work.

The heater 10 and the second temperature sensor 12 may be provided anywhere in the housing 5, but the heater 10 is preferably provided in the vicinity of the LD 6 which causes an unrecoverable failure, particularly near the base of the lead wire of the LD 6. . The temperature sensor 12 may be provided in the vicinity of the LD 6 as well, but it is more preferable to be provided at a position away from the heater 10 in order to more reliably prevent or remove the dew condensation including the optical element.

Since the dew condensation generation condition varies in a complicated manner depending on the temperature and humidity of the ambient air and the temperature of the dew condensation member (the temperature inside the housing), it is possible to use a humidity sensor that detects the ambient humidity together. Although it is clear that it is even better, the limit value and the threshold value may be set in consideration of the average indoor humidity or a humidity higher than the average humidity.

Further, the limit value and the threshold value in this embodiment are not limited to unique values, and a plurality of limit values and threshold values corresponding to the ambient temperature (or the temperature inside the housing) are preset. It is preferable that the threshold value and the threshold value corresponding to the temperature detected by the first (or second) temperature sensor are selectively read out by storing them in the ROM.

FIG. 3 is a perspective view showing an example of a cartridge case provided with a dew condensation sensor with a lid removed, FIG. 4 is an enlarged perspective view showing an example of the dew condensation sensor shown in FIG. 3, and FIG. 6 is a partial cross-sectional view showing an example of a state in which the cartridge shown in FIG.

As shown in FIG. 3, the condensation sensor 14 has two
The cartridge case (hereinafter referred to simply as “case”) 31 is provided at the inner corner so as not to come into contact with the disc-shaped optical disk 30 indicated by the dotted line. Condensation sensor 14
Outputs the presence / absence of dew condensation in the cartridge as conduction / non-conduction or a change in resistance value.

In the dew condensation sensor 14, for example, like the dew condensation sensor 14a shown in FIG. 4, a pair of electrodes 15a and 15b made of a thin conductive member such as a copper foil are provided on a glass substrate 16 which is an insulating substrate with a minute interval therebetween. For example, a gap 16 of about several μm
It is arranged with a open. Therefore, in the absence of dew condensation, the electrodes are insulated from each other, but if there is dew condensation, a minute current will flow due to the minute water droplets to conduct electricity.

If the gap 16a is wide, water droplets will not be conducted unless they combine with each other and develop into large grains, but if they are narrowed to about several μm, they will be conducted by fine water droplets in the initial stage of dew condensation. Electrode 15
If a and 15b are formed in a comb shape and face each other and the gap 16a is formed in a meandering shape, the effective detection area is increased and the resistance value of even fine water drops is lowered, so that the detection sensitivity is increased.

The dew condensation sensor 14a can obtain a high detection sensitivity at a very low cost by sticking a copper foil on the glass substrate 16 and forming the gap 16a by etching.
However, the dew condensation sensor 14 is not limited to the dew condensation sensor 14a shown in FIG. 4, and may be a sensor of a type in which a wider gap is filled with a resin dispersion resistance film or a hygroscopic resin.

As shown in FIG. 5, the pair of electrodes 15a and 15b of the dew condensation sensor 14 are connected to the pair of terminals 32a and 32b provided on the lower surface of the case 31, respectively. When the cartridge is mounted on the disk driver 1, the terminals 32a and 32b on the lower surface of the case 31 are respectively provided on the base plate 33 of the disk driver 1 and are connected to the microcomputer 20. The dew condensation information detected by the dew condensation sensor 14 in contact with is output to the microcomputer 20. When it is determined that there is dew condensation in the cartridge, the microcomputer 20 performs processing such as discharging the dewed cartridge.

Conventionally, the dew condensation inside the cartridge has not been taken into consideration. However, even if the OA device main body is placed in a warm room from the beginning and there is no dew condensation inside, the cartridge brought in from a cold outdoors or outdoors is not considered. If mounted, dew condensation will occur on the recording side surface of the optical disc, so that the laser beam will not be focused on a sharp spot, recording / playback will be disabled, and information will be mistaken. There is no difference with.

According to the present invention, the dew condensation sensor is provided in the cartridge case, and the detected dew condensation information is input to the microcomputer of the disk driver.
With a slight increase in cost, it is possible to easily prevent problems such as unrecordable / reproducible data, abnormal writing, and abnormal reading due to dew condensation on the optical disk surface, which has not been paid much attention to.

[0055]

As described above, the optical disk drive device and the optical disk cartridge according to the present invention are
It is possible to prevent the trouble due to the dew condensation by detecting the occurrence of the dew condensation or the high possibility of the dew condensation in advance.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main part of an optical disk drive device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an example of a control system of the optical disk drive device shown in FIG.

FIG. 3 is a perspective view showing an example of a cartridge case provided with a dew condensation sensor with a lid removed.

4 is an enlarged perspective view showing an example of the dew condensation sensor shown in FIG.

FIG. 5 is a partial cross-sectional view showing an example of a state in which an optical disc cartridge provided with a dew condensation sensor is mounted in an optical disc drive device.

[Explanation of symbols]

1 Disk Driver (Optical Disk Drive Device) 4 Optical Pickup 5 Housing 6 LD (Laser Diode: Light Source) 10 Heater (Heating Means) 11 First Temperature Sensor 12 Second Temperature Sensor 14 Condensation Sensor 15a, 15b
Electrode (conductive member) 16 Glass substrate (insulating substrate) 20 Microcomputer (output difference detection means, means for performing various processing when output difference exceeds a limit value) 21 LD control circuit (light source drive circuit) 22 Power cut Off circuit 23 Heater power supply 24 Motor controller 30 Optical disc 31 Case (cartridge case) 32a, 32b, 34a, 34b Terminal

Claims (6)

[Claims] 1. An optical disk drive device for recording information on an optical disk or reproducing information recorded on the optical disk by an optical pickup having a light source and an optical element group, a first temperature sensor for detecting an ambient temperature, and A second temperature sensor for detecting the temperature inside the housing of the optical pickup; an output difference detecting means for detecting an output difference between the first and second temperature sensors; and a temperature detected by the first temperature sensor for the first temperature sensor. And a means for stopping the operation of the light source drive circuit for driving the light source when the output difference is higher than the temperature detected by the temperature sensor and the output difference exceeds a preset limit value. apparatus. 2. An optical disk drive device for recording information on an optical disk or reproducing information recorded on the optical disk by an optical pickup having a light source and an optical element group, a first temperature sensor for detecting an ambient temperature, and A second temperature sensor for detecting the temperature inside the housing of the optical pickup; an output difference detecting means for detecting an output difference between the first and second temperature sensors; and a temperature detected by the first temperature sensor for the first temperature sensor. And a means for turning off a power supply or a drive circuit in the device when the output difference is higher than the temperature detected by the temperature sensor and the output difference exceeds a preset limit value. . 3. An optical disk drive device for recording information on an optical disk or reproducing information recorded on the optical disk by an optical pickup having a light source and an optical element group, a first temperature sensor for detecting an ambient temperature, and A second temperature sensor for detecting the temperature inside the housing of the optical pickup, an output difference detecting means for detecting an output difference between the first and second temperature sensors, and heat generation when energized to generate the housing of the optical pickup. A heating means for increasing the internal temperature, and a temperature detected by the first temperature sensor is higher than a temperature detected by the second temperature sensor, and the output difference exceeds a preset limit value, the output difference Is provided below the threshold value set to a value smaller than the limit value, and means for energizing the heat generating means is provided. Click the drive device. 4. Information is recorded on the optical disk or information recorded on the optical disk by an optical pickup having an auto-loading mechanism for automatically mounting and ejecting an optical disk cartridge containing an optical disk and having a light source and an optical element group. In an optical disc drive device for reproducing data, a first temperature sensor for detecting an ambient temperature, a second temperature sensor for detecting a temperature inside the housing of the optical pickup, and an output difference between the first and second temperature sensors. An output difference detecting means for detecting the temperature difference, and the auto loading mechanism when the temperature detected by the first temperature sensor is higher than the temperature detected by the second temperature sensor and the output difference exceeds a preset limit value. Means for ejecting the optical disk cartridge by means of Disk drive device. 5. An optical disk cartridge having an optical disk built in a cartridge case, comprising: a dew condensation sensor for detecting dew condensation in the cartridge case; and a terminal arranged outside the cartridge case and connected to the dew condensation sensor. An optical disk cartridge, wherein the terminal is connected to a terminal on the side of the optical disk drive when mounted in a drive. 6. The optical disk cartridge according to claim 5, wherein in the dew condensation sensor, a pair of conductive members made of copper foil or the like are arranged adjacent to each other at a minute interval on an insulating substrate, and the adjacent portions are mutually adjacent. An optical disk cartridge, characterized in that it is formed to have an intricate uneven shape.