JPS59127263A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To loading and unloading a recording medium without touching it by a hand by providing an upward/downward moving means which unloads the recording medium from a turntable associatively with the opening operation of a front cover and a forward/backward moving means which supports and moves the recording medium to a drawing-out position. CONSTITUTION:When the front cover 5 is opened by 90 deg., sliding plates 6a and 6b are drawn out to the front side associatively with the opening operation. At this time, projection parts 12 of guide plates 11a and 11b fall off the sliding plates 6a and 6b and are pressed up by upper ends of the sliding plates 6a and 6b, so that the guide plates 11a and 11b move up. At the same time, mounting plates 14a and 14b also move up by said movement and the center hole 21 of the recording medium 2 falls off the turntable 17. When a coupling member 16 is drawn out of an opening part in said state, a guide roll 13 rolls in a guide groove 15 and the mounting plates 14a and 14b are drawn out to the drawing- out positions through the opening part while mounting the recording medium 2. The recording medium when loaded is handled in the opposite operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information recording and reproducing apparatus that records and reproduces information using a light beam, and particularly to an improvement in a recording medium attachment/detachment mechanism.

Conventionally, information is recorded by irradiating the surface of a rotating disk-shaped recording medium with a light beam that is modulated according to the information and utilizing changes in physical properties caused by the energy. Information recording and reproducing apparatuses have been developed that reproduce information by scanning and detecting optical changes in reflected light (transmitted light). In this type of apparatus, the diameter of the light beam during recording is focused to a spot of approximately 1 micrometer. Therefore, high-density recording is possible, and information equivalent to about 1000 sheets of A4 paper can be recorded on a recording medium surface with a diameter of 300 mm. Furthermore, since the recording/reproducing speed is generally linearly proportional to the rotational speed of the recording medium, the rotational speed of the recording medium is often set to 2000 rpm or more.

In order to fully exhibit these characteristics, it is necessary to accurately focus the light beam at a predetermined position on the surface of the recording medium. However, since the objective lens used to focus the light beam onto the surface of the recording medium has a large numerical aperture, the depth of focus is shallow, and it is difficult to compensate for changes in the distance between the objective lens and the recording medium caused by warping of the recording medium. You will need a means to
A method is used in which the position of the objective lens is controlled by detecting changes in the shape of reflected light due to defocus and exciting a voice coil.

In addition, in order to correctly scan the signal track on the surface of the recording medium, the light beam is reflected by a rotatable mirror and then guided to the recording medium. The misalignment is corrected by rotating the mirror.At this time, it is desirable that the amount of correction be as small as possible in order to obtain responsiveness and reliability of the control mechanism.For conventional video discs, The center hole of the recording medium is fitted into the convex portion of the turntable, and the recording medium is held under pressure between the turntable and the pressure plate.For this reason, there is no gap (backlash) between the center hole of the recording medium and the convex portion of the turntable. ), but since video disc recording media are lightweight, vibrations are unlikely to occur even when rotated eccentrically.In addition, in this type of device, the reflected light of the light beam irradiated on the recording medium Since the signal is detected, the tracking signal is also S/S on video discs with strong reflected light.
N is good and eccentricity due to some gap (backlash) can be followed.

On the other hand, magneto-optical disks in particular are generally heavy (approximately 90 lbs.
0 grams or more), vibrations are likely to occur even with slight eccentricity. Furthermore, since the reproduced signal is weak, the response to large eccentricity is poor.

Furthermore, since such recording media are made by depositing a ferromagnetic thin film on a substrate such as glass, they can be damaged if subjected to shocks during attachment/detachment or storage, or if handled roughly.
It may crack and break due to centrifugal force during rotation, causing fragments to scatter. Furthermore, when a recording medium with a diameter of 300 mm is destroyed at 2000 flails, the speed of the fragments is 10
It even reaches 0h+/h.

Therefore, when replacing such a recording medium as necessary, it is important to avoid unnecessary shock when installing and removing it, and to avoid eccentricity as much as possible by making sure that the convex part of the turntable and the center hole of the recording medium are perfectly aligned. The recording medium may be removed violently.

An object of the present invention is to provide an information recording/reproducing device that can prevent shocks and rough handling to a recording medium during attachment and detachment.

In order to achieve this object, the present invention provides a front cover that closes an opening provided on the front surface, a vertical movement means for removing the recording medium from the turntable in conjunction with the opening of the front cover, and a vertical movement means for removing the recording medium from the turntable in conjunction with opening of the front cover. support recording media that
and a back-and-forth moving means arranged to be able to move through the opening to a position where the recording medium is pulled out to the outside, thereby removing the recording medium from the turntable and pulling out the recording medium.
The feature is that the operator can perform the operation without touching the recording medium.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a perspective view of an information recording and reproducing device, FIG. 2 is a perspective view showing the front cover in an open state, and FIG. 3 is a disc-shaped FIG. 4 is an exploded view showing the cylindrical convex portion of the turntable and the tightening member. Reference numeral 1 denotes an optical head housing a known optical system, which is located above the recording medium 2 and is movable in the direction of the arrow along a guide rail 3R13b.

Positioning the optical head 1 above the recording medium 2 is a desirable configuration because the laser beam is irradiated downward onto the recording medium 2, which prevents the laser beam from directly entering the eyes. be. Reference numeral 4 denotes a mounting cornice on which the recording medium 2 is mounted, which includes a turntable and a tightening member to be described later, and has a built-in DC motor (not shown) for driving the turntable. Reference numeral 5 indicates a front cover that closes an opening provided on the front surface, and 6a and 6b indicate slide plates connected to the front cover 5, each having a notch 7 and a guide groove 8.
is formed.

Support plates 9a and 9b are fixed to both sides of the mounting unit 40, and guide rows/I/10 that fit into the guide grooves 8 of the slide plates 6a and 6b are fixed to the support plates 9a and 9b. The slide plates 6a and 6b are a support plate 9a that can be moved back and forth.

It is supported by 9b. Slide plates 6a, 6b and support plate 9a
, 9b, a guide plate 11a111b is disposed so as to be movable only in the vertical direction.

The guide plates 11a and llb are provided with a protrusion 12 and a guide roll 13, and the protrusion 12 is stopped by the notch 7 of the slide plates 6a and 6b. Guide plate 11a, ll
Placement plates 14a and 14b are placed on the upper ends of b, and the guide roll 13 is placed in the guide groove 1 provided on the placement plates 14a and 14b.
5, the mounting plates 14a, 14b are supported by the guide plates i1a, llb so as to be movable back and forth. The mounting plates 14a and 14b are connected by a connecting part 16 at the front and rear thereof, and are configured to carry the recording medium 2. The mounting plate 14a114b is positioned lower than the turntable when the recording medium 2 is mounted on the turntable, which will be described later. 17 is a turntable that rotates in the direction of the arrow by a DC motor (not shown); 18 is a fourth turntable;
As shown in the figure, it is a cylindrical convex part formed at the center of the turntable 17, and is a sleeve for expanding the outer circumference) 19a
, 19b, 19c are formed, and a threaded part 2 is formed inside.
0 is set. 21 is a center hole in the center of the recording medium 2; 22 is a tightening member having a tapered threaded portion 23 formed thereon; and 24a and 24b are screws that are mounted to the recording medium 2 so as not to cause unnecessary impact or damage. This is a suppuration board made of 180 mesh urethane rubber, wool felt, etc. that is pasted on the placing plates 14a and 14b.

Next, the operation will be explained. The case where the recording medium 2 is removed from the mounting unit 4 will be explained. First, move the optical head 1 above the recording medium 2 from - to the guide rail 3a.
, 3b to the right (Fig. 1), and
Insert your hand between the guide rail 3a and the guide rail 3b, and tighten the member 22 by turning it counterclockwise to remove it. Next, when the front cover 5 is opened 90 degrees toward the front, the slide plates 6a and 6b are pulled out toward the front. At this time, the protrusions 12 provided on the guide plates 11a, 11b come off the notches 7 of the slide plates 6a, 6b, and are pushed up by the upper ends of the slide plates 6a, 6b, as shown in FIG. Therefore, the guide plates 1'la and 11b move upward. At the same time, as the guide plate 113111b moves upward, the mounting plates 14a and 14b also move upward, and as a result, the center hole 21 of the recording medium 2 is removed from the cylindrical convex portion 18 of the turntable 170, and the recording medium 2 is removed from the turntable 17. Medium 2 escapes. This state is shown in FIG. In this state, when the connecting member 16 connecting the mounting plates 14a and 14b is pulled forward from the opening, the guide roll 13 rolls in the guide groove 15 and is guided.
The mounting plates 14a and 14b are pulled out with the recording medium 2 placed thereon through the opening to the draw-out position shown in FIG.

Then, the recording medium 2 is replaced.

Next, the case where the recording medium 2 is mounted on the mounting unit 4 will be explained. After replacing the recording medium 2 with the one you need, place it on the mounting plates 14a and 14b, and insert the recording medium 2 through the opening into the mounting plate 14.
a, 14b to the mounting position shown in FIG.

Then, close the front cover 5. By twisting the front cover 5, the slide plates 6a and 6b move backward in conjunction with each other, and at this time, the protrusion 12 is guided by the notch 7, so the guide plates 11a and llb move downward. do. At the same time, the mounting plates 14a and 14b on which the recording medium 2 is mounted also move downward,
The center hole 2I of the recording medium 2 fits into the cylindrical convex portion 18 of the turntable 170. The cylindrical convex portion 18 and the rotation center of the turntable 170 are finished with an accuracy of within 2 micrometers, and the turntable 17 itself is dynamically balanced and maintains extremely high accuracy.

Further, this cylindrical convex portion 18 has three slits 19B,
19 b and 19 c, it is possible to expand the outer diameter of the cylindrical convex portion 18, and the center hole 2 of the recording medium 2 can be expanded.
1 is slightly larger than the diameter of the cylindrical convex portion 18 (approximately 30 micrometers).

When the center hole 21 of the recording medium 2 fits into the cylindrical convex part 18, insert your hand again from between the guide rail 3a and the guide rail 3b, and tighten the threaded part 23 of the member 22 into the cylindrical convex part 18. Screw it into the threaded part 20 clockwise. Thereby, the recording medium 2 is held on the mounting unit 4. Note that the threaded portion 23 of the member 22 is tapered, so by screwing it in, the threaded portion 23 of the cylindrical convex portion 18 is tightened.
0 is pushed out, that is, slit 19a, 1
9b and 19c are pushed apart, the gap (approximately 30 micrometers) between the center hole 21 of the recording medium 2 and the cylindrical convex portion 18 can be eliminated, and the eccentricity in mounting the recording medium 2 can be reduced to approximately 2 micrometers. It is possible to suppress the following.

According to this embodiment, the operator does not touch the recording medium 2 until the recording medium 2 is removed from the turntable 17 and pulled out of the apparatus, or conversely until it is returned from the pulled-out position to the mounting position on the turntable 17. Since the recording medium 2 is handled only at the immediate pull-out position without touching it, shocks and rough handling to the recording medium 2 can be prevented as much as possible, and the work of attaching and detaching the recording medium can be done with less individual differences. However, it can be easily attached and detached.

Furthermore, the outer diameter of the cylindrical convex portion 18 is a sleeve) 19a.

Since it is expanded by 19b and 19c, installation can be performed with as little eccentricity as possible.

In this embodiment, the plates 11a and 11b correspond to the vertical moving means of the present invention, and the mounting plates 14a and 14b and the connecting member 16 correspond to the forward and backward moving means.

In the illustrated embodiment, three sleeves) 19a, 19b and 119c are provided, but they may also be provided with two or four or more. Further, although the vertical movement of the guide plates 11a and 11b and the longitudinal movement of the mounting plates 14a and 14b are manually driven, they can also be driven electrically.

As explained above, according to the present invention, there is provided a front cover that closes the opening provided on the front surface, a vertical movement means for removing the recording medium from the turntable in conjunction with the opening of the front cover, and a vertical movement means for removing the recording medium from the turntable. Supporting recording media that has broken away,
and a back-and-forth moving means arranged to be able to move through the opening to a position where the recording medium is pulled out to the outside, thereby removing the recording medium from the turntable and pulling out the recording medium.
Since the operator can do this without touching the recording medium, it is possible to prevent shocks and rough handling of the recording medium when attaching and detaching.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention, and Fig. 2 is a perspective view showing an embodiment of the present invention.
FIG. 3 is a perspective view showing the state in which the front cover in the figure is open, FIG. 3 is a perspective view showing the disc-shaped recording medium being pulled out, and FIG. FIG. 2... Recording medium, 4... Mounting unit, 5... Front cover, 6a, 6b... Slide plate, 7... Notch, 8... Guide groove, 10... Guide roll, 11a
. 11b...Guide plate, 12...Protrusion, 13...Guide roll, 14a, 14b...Placement plate, 15...
Guide groove, 17... Turntable, 18... Cylindrical convex portion, 19a, 19b, 19cm slit, 20...
- Threaded part, 21... Center hole, 22... Tightening member, 23... Threaded part. Patent Applicant Canon Co., Ltd. Agent Minoru Nakamura Figure 2 Figure 3 Figure 7

Claims (1)

[Claims] 1. In an information recording and reproducing device equipped with a turntable on which a recording medium on which information is recorded by a light beam is placed, there is a front cover that closes an opening provided at the front, and a recording operation that is performed in conjunction with the opening of the front cover. A vertically moving means for disengaging the medium from the turntable, and a longitudinally moving means arranged to support the recording medium disengaged from the turntable and move it to a position where it is pulled out through the opening. An information recording and reproducing device characterized by: