JPH0586148U - Optical disk device - Google Patents

Abstract

(57) [Summary] [Object] To provide an optical disk device capable of detecting a defective setting of the optical disk 4 after the loading is completed and before the access to the information recording section is started. [Structure] Set detecting means for detecting that the optical disk 4 is set on the turntable 5a, and the optical disk 4
Of the optical disk 4 by means of the detection elements 14 and 15 mounted between the innermost position of the movable optical system 8 for accessing the information recording section and the outer peripheral position of the turntable 5a. -Optical disk 4 through window 3 of trig 1
The tilt detection means for detecting the tilt of the
When set on the table 5a, the set state judging means for judging whether the tilt of the optical disk 4 is within the normal range based on the signal from the tilt detecting means, and the tilt range of the optical disk 4 is within the normal range. If not, the optical disk device is provided with a set failure output means for outputting a signal to that effect.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc device, and more particularly, to a device having a mechanism for detecting a defective loading of an optical disc.

[0002]

[Prior Art]

 In the optical disk device, when the cartridge containing the optical disk is set in the cartridge holder on the device side, the loading mechanism operates. That is, after the cartridge is sent to the turntable and set, the magnet provided in the center of the turntable attracts the magnetic hub in the center of the optical disk in the cartridge. To be done. As a result, the center shaft, which is the center of the turntable, is inserted into the hub hole at the center of the optical disk. After that, the information recording section of the optical disk is accessed by the movable optical system.

[0003]

[Problems to be solved by the device]

 As described above, the magnetic hub at the center of the optical disk is attracted to the magnet at the center of the turntable, so that it is set on the turntable. For this reason, the optical disc may not be accurately positioned, and in that case, the hub hole of the optical disc may not be set accurately on the center shaft of the turntable side, and the optical disc may not be aligned with the turntable. Incline.

When the access to the recording portion of the optical disc is started while the tilted state is caused by the above-mentioned setting failure, in other words, when the rotation of the turntable is started, the inner circumference of the magnetic hub of the optical disc is started. The surface rubs against the center shaft and wears the magnetic hub. Due to this, the inner diameter of the hub hole changes and the rotation of the optical disc becomes uneven, or the metal powder scattered from the magnetic hub adheres to the magnet in the center of the turntable. Occurs.

The present invention is intended to solve the above-mentioned problems. That is, it is an object of the present invention to provide an optical disk device capable of detecting a defective setting of an optical disk after the loading is completed and before the access to the information recording section of the optical disk is started.

[0006]

[Means for Solving the Problems]

 According to the present invention, an optical disk housed in a cartridge is set on a turntable which is rotated by a spindle motor, and an information recording portion of the optical disk is opened in the cartridge. In an optical disk device accessed by a movable optical system through a window; set detection means for detecting that the optical disk is set on the turntable; and the innermost position of the movable optical system and the target. An inclination detecting means for detecting the inclination of the optical disc through a window of the cartridge by a detection element mounted between the optical disc and the outer peripheral position of the table; and the optical disc on the table. When set, set state determination means for determining whether or not the inclination of the optical disc is within a normal range based on the signal from the inclination detection means; If not in Kiga within the normal range set and defective output means for outputting a signal indicating that; an optical disc apparatus equipped with.

In the above, as the detection element of the inclination detecting means, for example, an element including an LED for irradiating the disk surface with parallel light and a four-division photodiode for receiving the reflected light from the disk surface is used. Can be used. Further, the set failure output means may be means for outputting a signal for warning the operator that the tilt of the optical disk is abnormal, or alternatively, the loading mechanism may be operated in the reverse direction so that the cartridge is read. A means for outputting a signal for discharging from the cartridge holder may be used.

[0008]

[Action]

 When the optical disk is set on the turntable, the setting detecting means detects that. Correspondingly, when the tilt detecting means detects the tilt of the optical disk and the set state judging means judges that the tilt is out of the normal range, a signal to that effect is given by the set failure output means. Is output.

[0009]

【Example】

 Embodiments of the present invention will be described below. FIG. 1 is a perspective view showing a disassembled state of the mechanism of the embodiment apparatus, and FIG. 2 is an explanatory view of an element for detecting the tilt of an optical disk used in the embodiment apparatus.

In this optical disc apparatus, the optical disc 4 housed in the disc cartridge 1 is set on a turntable 5a rotated by a spindle motor 5 by a loading mechanism (not shown). After that, the magnetic hub 4a of the optical disc 4 is attracted by the magnetic force of the turntable 5a, whereby the center shaft 5b of the turntable 5a is inserted into the hub hole 4b of the optical disc 4. Is inserted. That is, the optical disc 4 is positioned.

When the magnetic hub 4a of the optical disc 4 is attracted as described above and the center shaft 5b of the turntable 5a is inserted into the hub hole 4b of the optical disc 4, this timing (this timing is, for example, After the completion of setting of the disk cartridge 1 is detected by a sensor (not shown), which is after a predetermined time sufficient for completion of adsorption, the tilt of the optical disk 4 is detected.

The tilt of the optical disk 4 is detected by a pair of detecting elements 14 and 15 mounted near the outer peripheral surface of the outer casing of the spin drum motor 5 for rotating the turntable 5a. Done. As shown in FIG. 2B, the detecting elements 14 and 15 receive the LED 15 that emits parallel light to the optical disc 4 through the window 3 on the back side of the disc cartridge 1 and the reflected light from the optical disc 4. It consists of a 4-division photo diode 14.

Since it is necessary to irradiate the disc surface with parallel light and receive reflected light from the disc surface, the detection elements 14 and 15 are provided on the outer peripheral surface of the outer casing of the spindle motor 5. In the vicinity, the carriage 8 of the movable optical system is mounted inside the position displaced toward the innermost side (spindle motor 5 side). This position is a position facing the window 3 on the back surface side of the disc cartridge 1, and is a position where the above-mentioned irradiation and reflection cannot be obstructed by the disc cartridge 1. The reason why the detection elements 14 and 15 are not attached to the carriage 8 of the movable optical system facing the window 3 is that the weight of the carriage 8 is not increased.

When the optical disc 4 is not tilted, the reflected light received by the four-division photodiode 14 is the center (+ character) of the light-receiving surface of the four-division photodiode 14 shown in FIG. It is adjusted so that it becomes a perfect circle centered on the intersection of the shapes. Therefore, in this case, the output signal from the output terminal 18 of the detection circuit becomes "0". On the other hand, when the optical disc 4 is tilted, the shape of the reflected light deviates from the perfect circle and becomes an elliptical shape that is distorted according to the degree of tilt. Therefore, the output terminal 18 of the detection circuit outputs a signal having a level corresponding to the degree of tilt.

If the detection elements 14 and 15 detect that the tilt of the optical disk 4 is out of the normal range, a loading mechanism (not shown) is driven in reverse based on the output signal from the output terminal 18. To be done. As a result, the disk cartridge 1 is sent out from the turntable 5a and discharged from a cartridge holder (not shown). After that, reloading is performed. The re-loading may be automatically performed subsequent to the discharging, or may be performed by the operator.

On the other hand, as a result of the detection by the detection elements 14 and 15, if the inclination of the optical disc 4 is within the normal range, the recording portion of the optical disc 4 can be accessed. That is, the turntable 5a is rotated by the driving force of the spin drum motor 5, and the movable optical system carriage 8 equipped with an optical head composed of the objective lens 12 and the like is guided by the reference guide rail 9. Thus, it can be moved in the radial direction of the optical disc. The movable optical system carriage 8 is moved by a linear motor coil 13 arranged beside the reference guide rail 9. Further, the light output from the optical head is guided to the fixed optical system 7 and processed by a known optical disk device.

[0017]

[Effect of the device]

 As described above, in the present invention, when the optical disc is set on the turntable by the loading mechanism, the inclination of the optical disc is immediately detected. As a result, when it is determined that the tilt of the optical disc is abnormal, a signal indicating that is output by the defective set output means. This makes it possible to take appropriate measures such as ejecting the cartridge in which the optical disc is stored or prompting the operator to reset the optical disc.

Therefore, the optical disc is not rotated and the recording section is not accessed while the loading is defective. Therefore, the inner peripheral surface of the magnetic hub of the optical disk is rubbed against the center shaft and worn, the inner diameter is changed, and the metal powder is prevented from scattering in the turntable. Moreover, since the rotation of the optical disk is not eccentric, the accuracy is good.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external appearance of a mechanism of an apparatus according to an embodiment in a disassembled state.

FIG. 2 is an explanatory diagram of an element for detecting the tilt of the optical disc.

[Explanation of symbols]

 1 Disc Cartridge 2, 3 Cartridge Window Frame 4 Disc 4a Magnetic Hub 5 Spindle Motor 5a Turntable 5b Center Shaft 12 Objective Lens 14 4-Division Photodiode 15 LED

Claims (1)

[Scope of utility model registration request] 1. An optical disk housed in a cartridge is set on a turntable which is rotated by a spindle motor, and an information recording section of the optical disk is opened in the cartridge. In an optical disk device that is accessed by a movable optical system through a window; set detection means for detecting that the optical disk is set on the turntable; and the innermost position of the movable optical system and the By the detection element attached between the outer periphery of the turntable,
Tilt detecting means for detecting the tilt of the optical disk through the window of the cartridge; and when the optical disk is set on the turntable, based on a signal from the tilt detecting means of the optical disk. A set state determination means for determining whether or not the tilt is within a normal range, and a set failure output means for outputting a signal to that effect when the tilt of the optical disk is not within the normal range. Optical disk device.