JPH01185890A - Optical type information recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable the yoke of an optical head part to be operated at high speed and stably by providing the mounting stand of an information recording medium, a means which rotates and drives the mounting stand, a triblet which fits through the information recording medium and locks it and a means which engages to the triblet and stops the information recording medium on a base moved with the aid of a linear driving means independently of the optical head part. CONSTITUTION:A clamp arm 32 extending to the upper part of a turn table 29 is fixed to a clamp supporting stand 31 through an axis 33 so as to be turned up and down. By loading an optical disk D on the table 29 and turning the arm 32 downward, the disk D can be held as it is sandwiched between the table 29 and a magnet 34. While the disk D is rotated by the driving force of a spindle motor 28, the whole movement base 21 can be linear-moved along a guide axis 23 by the driving force of a linear motor. Thus, high speed access can be stably executed.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to optical information recording and/or reproduction of information using irradiated light and/or reflected light/transmitted light using an information recording medium. The present invention relates to a recording/reproducing device.

[Prior art] Optical information recording and reproducing devices are capable of recording and reproducing high-density, large-capacity information.
It has attracted particular attention in recent years because it enables playback and high-speed searching that cannot be achieved with magnetic tape. Various small-sized optical systems using semiconductor lasers as light sources have been proposed for use in such devices, and an optical disk device will be described below as an example.

FIG. 3 shows a perspective view of the optical disc 1 of the optical disk device, and the laser f-light emitted from the semiconductor laser light source 2 is
After being converted into parallel light by a collimator lens 3, it passes through a polarizing beam splitter 4 for separating the incident light and the reflected light from the disk D, and is bent in the direction of the disk D by a total reflection mirror 5, and is converted into a 1/4 wavelength beam. After being converted into circularly polarized light by the plate 6, it is guided to the objective lens 7. Objective lens 7
The laser light that has reached this point is focused into a minute light beam and irradiates the information signal recording surface of the disk D.

The reflected light from the disk D travels in the same optical path as the incident light until it reaches the polarizing beam splitter 4, but it is converted from circularly polarized light to linearly polarized light in a direction perpendicular to the incident light by the 174 wavelength plate 6. Then, the light is reflected in the right angle direction by the polarizing beam splitter 4, passes through the cylindrical lens 8, and is received by the light receiving element 9. The electrical signal output obtained from the light receiving element 9 is a reproduction signal of information recorded on the disc D,
Used as a focus control signal and tracking control signal. Further, the operation of the aperture of the light spot for focus and tracking control is performed by an objective lens drive mechanism (not shown) that drives the objective lens 7 in the direction of the disk D and in the radial direction of the disk D.

FIG. 4 is a side view showing a conventional example of an optical head feeding device 10 and a disk rotating device 11 that linearly move an optical head l comprising the optical system shown in FIG. 3 in the radial direction of the disk D. Although stepping motors and the like have been used as the optical head feeding device 10, linear motors are now often used due to their accuracy and fast response speed.

FIG. 5 is a perspective view showing an example of a linear motor used as the optical head feeding device 10 in a conventional example. 2
Book guide shafts 12 are arranged in parallel, and rectangular parallelepiped permanent magnets 13 are arranged at both ends of these guide shafts 12, and the permanent magnets 13 have an N pole on the inside and an S pole on the outside. A yoke 14 having a U-shaped cross section surrounds the guide shaft 12.
is supported by a support fitting 15 and fixed to the outer surface of the permanent magnet 13. A bobbin 16 is provided movably along the guide shaft 12, and a coil 17 is wound around the bobbin 16. Connecting fittings 18 are fixed to both ends of the bobbin 16, a base 19 is fixed between the connecting fittings 18, and the optical head 1 is fixed to the center of the base 19.

When driving the near motor in this way, the guide shaft 1
Magnetic lines of force are generated between the outer surface of the guide shaft 1 and the inner surface of the yoke 14, and when the current flowing through the coil 17 arranged in the space where these lines of magnetic force are generated is controlled, the guide shaft 1
A magnetic driving force is generated in the axial direction of the guide shaft 12, and this driving force causes the carriage consisting of the bobbin 16, the coil 17, the connecting fitting 18, and the base 19 to move along the guide shaft 12.

[Problems to be Solved by the Invention] In this type of access mechanism in which a near motor is used to drive the optical head, the output of the linear motor must be increased in order to speed up the access time to the information track. In addition, in order to increase the output of the linear motor, it is possible to increase the number of coil turns, increase the coil wire diameter, or increase the current control, but in any case, the linear motor, optical head This results in an increase in the size of the drive device body and power supply device.

Furthermore, if the access speed is increased by increasing the output of the linear motor, a large load will be imposed upon stopping after access. The optical head consists of an optical block in which the main components, autofocus and autotracking detection elements, semiconductor laser light sources, etc. are arranged, an objective lens, a support part that supports the objective lens in a movable state, and a support part that drives the objective lens two-dimensionally. and an actuator section consisting of a drive section and the like. In addition, since the optical block and actuator section have separate vibration systems, when the optical head suddenly accelerates or decelerates, the actuator section cannot follow it when viewed from the optical block side and may receive unnecessary vibrations. There are concerns that this may have an adverse effect on the autofocus device configuration or autotrack mechanism. In order to control this vibration, a method has been proposed in which acceleration and deceleration at the beginning and end of the access operation are performed slowly, but it is difficult to increase the access speed with this method.

[Object of the Invention] An object of the present invention is to provide an optical information recording/reproducing device that can improve the above-mentioned problems and operate the yoke of the optical head section at high speed and stably.

[Summary of the Invention] The gist of the present invention for achieving the above-mentioned object is to provide an optical information recording/reproducing apparatus that records, reproduces, and erases information by rotating an information recording medium and using an optical head section. A base that moves by linear drive means independently of the optical head section, a mounting table for the information recording medium, a means for rotationally driving the mounting table, a core shaft that is inserted into and engaged with the information recording medium;
The optical information recording and reproducing device is characterized in that it is provided with means that engages with the core shaft and presses the information recording medium.

[Embodiments of the Invention] The present invention will be explained in detail based on the embodiments shown in FIGS. 1 and 2.

FIG. 1 is a perspective view, and FIG. 2 is a sectional view.
1 is two guide shafts 2 whose both ends are fixed to the main body board 22.
3, and a bobbin 25 around which a coil 24 is wound is attached to both ends of the base 21. A yoke 26 is inserted into the bobbin 25, and both ends of the yoke 26 are also fixed to the main body board 22. A permanent magnet 27 is attached to the yoke 26 on the outside of the coil 24.
It is fixed to the main body board 22 in parallel with. Further, a spindle motor 28 serving as a means for rotating the optical disc D is arranged at the center of gravity on the moving base 21, a turntable 29 is pivotally attached above the spindle motor 28, and the optical disc D is mounted on the turntable 29. A core shaft 30, which is an extension of the motor shaft, is protruded into which the central hole of the motor shaft is fitted.

Further, a clamp support stand 31 is fixed on the movable base 21, and a clamp arm 32 that extends upward from the turntable 29 is attached to the clamp support stand 31 and rotates in the vertical direction via a pivot shaft 33. It is installed so that it can be done. A magnet 34 is rotatably supported at the tip of the clamp arm 32, and the magnet 34 is engaged with the core shaft 30 by the pressing force of a spring 35 provided around the pivot shaft 33. Also, turntable 2
An optical head section 36 is arranged above the optical head 9 .

In the above configuration, the optical disc D is placed on the turntable 2.
By mounting the optical disc D on the turntable 29 and rotating the clamp arm 32 downward, the optical disc D can be held between the turntable 29 and the magnet 34. While the optical disk D is rotated by the driving force of the spindle motor 28, the entire movable base 21 is linearly moved along the guide shaft 23 by the driving force of the linear motor, which also includes the coil 24, yoke 26, and permanent magnet 27. Can be done.

Therefore, by linearly moving the movable base 21 while keeping the optical drive section 36 fixed to the main body substrate 22, the optical disc D can be accessed. At this time, since the optical block and actuator section mounted on the optical head section 36 are not subjected to vibrations due to acceleration and deceleration,
High-speed access can be performed stably.

[Effects of the Invention] As explained above, the optical information recording/reproducing device according to the present invention prevents adverse effects on autofocus, autotracking mechanisms, etc. that occur during high-speed access by separating the optical head section from the drive of the optical disk. Furthermore, by installing the rotation drive means and the clamp means on the same moving base, it is possible to mount the information recording medium and use it as an alternative mechanism for the loading mechanism, which reduces costs. It is possible to reduce the

[Brief explanation of the drawing]

1 and 2 show an embodiment of the optical information recording and reproducing apparatus according to the present invention, FIG. 1 is a perspective view of a drive mechanism, FIG. 2 is a sectional view thereof, and FIGS. FIG. 5 is an explanatory diagram of a conventional example. 21 is a moving base, 22 is a main body board, 23 is a guide shaft, 24 is a coil, 26 is a yoke, 27 is a permanent magnet, 2
8 is a turntable, 29 is a spindle motor, 30 is a core shaft, 31 is a clamp support base, 32 is a clamp arm,
33 is a pivot, 34 is a magnet, 36 is an optical head section,
D is an optical disc. Patent applicant Canon Co., Ltd. L--J > -90-

Claims (1)

[Claims] 1. In an optical information recording and reproducing device that records, reproduces, and erases information by rotating an information recording medium and using an optical head section, a base that is moved by a linear drive means independently of the optical head section; A mounting table for the information recording medium, a means for rotationally driving the mounting table, a core shaft that is inserted into and locks the information recording medium, and a means that engages with the core shaft and holds the information recording medium are provided. An optical information recording and reproducing device characterized by: