JPS5830241Y2 - Disc recording or playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for recording or reproducing information signals by rotating a disk-shaped recording medium, and more particularly to a disk recording or reproducing device that takes safety into consideration.

2. Description of the Related Art In recent years, optical recording or reproducing devices have been developed that use light beams such as laser beams to record signals on recording media or read recorded signals.

An example of this type of optical reproducing device will be explained based on FIGS. 1 to 3.
As shown in the figure, an information signal such as a video signal or an audio signal is recorded in FM using recesses or pits 2 in the form of a spiral track.

The width of the pit 2 is approximately 1 μm1, the depth of the pit is approximately 1λ (here, λ is the wavelength of the laser beam), and in the case of a video disc, the length of the pit is different depending on the inner and outer sides, for example, 1.5~ It is 6μ.

As shown in FIG. 3, such a recording medium 1 includes a transparent resin layer 3 made of vinyl chloride or the like in which pits 2 are formed, an extremely thin reflective film 4 provided on this uneven surface, and a thin protective film 5 that protects the reflective film. It is composed of.

The recording medium 1 is a turntable 6 as shown in FIG.
For example, 1 is fixed by a clamper 7 on the
It is rotated at a speed of 800 r, p, m.

On the other hand, a light beam projection device 10 that projects a light beam 9 onto the recording medium 1 is driven by a drive device 11 to project the light beam 9 onto the disk-shaped recording medium 1.
is gradually moved in the radial direction of the recording medium 1.
is spirally scanned by the light beam 9.

Laser 1 light emitted from, for example, a helium-neon laser light source 12 of a light beam projection device 10 arranged below the recording medium 1 passes through a concave lens 13, a beam splitter 4, a 7λ polarizing plate 15, a rotating mirror 16, and a condenser. A light beam 9 is converged through the optical lens 17, and this light beam 9 is projected onto the recording medium 1.

The spot 9a of the light beam 9 on the recording medium is wider than the width of the pit 2 as shown in FIG. 2, and when scanning the pit 2, the reflected light inside the pit and the opposite light outside the pit cancel each other out, and the reflected output becomes small; when the beams are projected only outside the pit, there is no cancellation, so the reflected output becomes strong.

Therefore, a reflected light beam 9b having a strength corresponding to the presence or absence of the information signal pit 2 is obtained, and this reflected light beam 9b is optically detected via the lens 17, the rotating mirror 16.7λ polarizing plate 15, and the beam splitter 4. 18, where it is converted into an electrical signal and sent to a demodulation circuit.

Tracking control is generally performed by changing the rotation angle of the rotating mirror 16, and light beam convergence control is generally performed by displacing the condensing lens 17 with a moving coil.

By the way, in the video disk reproducing apparatus as described above, the recording medium 1 rotates at high speed, so it is dangerous if a human body directly touches the drive mechanism or the like of the recording medium 1 while it is rotating at high speed.

Therefore, a lid is generally provided to cover the recording medium 1 and the rotation mechanism.

If the lid is configured so that it cannot be opened unless the rotation of the disk completely stops, the device will be highly safe.

However, this is inconvenient in terms of handling, as it is necessary to wait at 1, when the rotation of the disk completely stops.

Therefore, it is desirable that the brake be applied when the lid is opened, such as in a dewatering device for a domestic electric washing machine, or that the lid can be opened while braking is in progress.

By the way, since the lid is generally opened manually, the opening speed is not constant.

For this reason, even if braking is in progress, if the lid is opened extremely quickly, the disc may spin at high speed, which is dangerous.

In addition, if a flexible disk is rotated at high speed while sealed by the lid, if the lid is opened rapidly, negative pressure will be generated on the top surface of the disk, and the outer periphery of the disk will be lifted and damaged. It may cause a feeling of anxiety or discomfort.

The above-mentioned problems are not limited to optical disk playback devices, but also exist in other types of disk playback devices.

Similar problems also exist in disk recording devices.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disk recording or reproducing device that can reduce negative pressure and improve safety with a simple configuration.

The present invention to achieve the above object will be described with reference to the reference numerals in the drawings showing the embodiments for easy understanding.
a motor 8 for rotating the disk-shaped recording medium 1; a turntable 6 for rotating the recording medium coupled to the motor 8; and recording of information signals on the disk-shaped recording medium 1 or information from the disk-shaped recording medium 1. A closed position that covers a recording or reading device for reading signals, the motor 8, the turntable 6, a container body 21 that houses the recording or reading device, and the disc-shaped recording medium 1 placed on the turntable 6. a lid body 23 rotatably attached to the container body 21 so as to be rotatable between a fully open position in which the disc-shaped recording medium 1 can be easily attached to and detached from the turntable 6; For example, the locked protrusion 2 of the embodiment is provided on the lid 23 to keep the lid 23 in the closed position.
5, and a locking piece 27 provided on the container body 21 to engage with the locked portion and keep the lid 23 in the closed position. A locking part,
When the lid body 23 is closed to the closed position, the lid body 23
Although it is possible to apply a biasing force in the lid opening direction to the lid body 23 and to put a finger on the open end of the lid body 23 by the biasing force when the engagement between the locked part and the locking part is released. and a spring 29 that opens the lid 23 when the disk-shaped recording medium 1 is in an incompletely open position in which it is impossible to attach or detach the disk recording or reproducing device. .

According to the above invention, the spring 2 that generates the biasing force in the opening direction
Since the incompletely open position is obtained by 9, the partially open position can be obtained simply by releasing the engagement between the locked portion and the locking portion.

Therefore, a partially open position can be obtained with a simple construction.

In addition, the incompletely open position is a position where the open end is opened to the extent that a finger can enter, but the recording medium 1 cannot be attached or detached.
Negative pressure conditions are reduced and safety is improved.

An embodiment of the present invention will be described below with reference to the drawings.

The configurations and functions of the disc recording medium 1, turntable 6, clamper 7, and motor 8 in FIG. 4, which explanatoryly shows a video disc reproducing apparatus according to an embodiment of the present invention, are designated by the same reference numerals as in FIG. is substantially the same as that of

The light beam projection device including the scanning device, which is not shown in detail, is also constructed in the same manner as in FIG.

21 is a container body, and a lid body 23 is connected to this body 21 by a hinge 22 so as to be openable and closable.

Reference numeral 24 denotes a partition plate which is positioned above the light beam projection device 10 shown in FIG. 1 to protect the light beam projection device 10 and cover the inside of the device when it is folded.

Of course, a slot is formed in the movement range of the light beam, and the light beam is projected onto the recording medium 1 through this slot.

Reference numeral 25 denotes a locking protrusion provided at the tip of the lid 23, in which a hole 26 is formed as shown in FIG.

27 is a locking piece, which is a portion that engages with the hole 26 of the locked protrusion 25.

Reference numeral 28 denotes a partially open frame, to which an upward biasing force is applied by a coil spring 29.

30 is a microswitch for placing the motor 8 in a braking state.

The incomplete lid opening device will be explained in more detail based on FIG.
A locking piece 27 provided with a hook portion 31 and an inclined surface 32 is fixed to a rotating shaft 33, and is biased counterclockwise in FIG. 5 by a spring 34.

An operation button 37 is fixed to the other end of the shaft 33, which is rotatably supported by bearings 35 and 36.

Through holes 39 and 40 are provided in the U-shaped support member 38 that is fixed to the lower surface of the partition plate 24 and the side wall of the container body 21, and the partially opened frame 28 is moved in the vertical direction into the through holes 39 and 40. It is inserted freely.

A coil spring 29 that applies an upward biasing force to the open frame 28 (in the opening direction) is installed between the collar portion 41 fixed to the open frame 28 and the lower surface portion 38a of the U-shaped support member 38.

When reproducing the apparatus configured as described above, the recording medium 1 is placed on the turntable 6 as shown in FIG.
The information signal is read from the recording medium 1 as explained in the figure.

When closing the lid body 23, the tip of the protruding piece 25 to be locked presses against the inclined surface 32 of the locking piece 27, and the locking piece 27 is moved clockwise in FIG. 5 against the biasing force of the spring 34. When the hook portion 31 reaches the position of the hole 26, the hook portion 31 is inserted into the hole 26.
1 enters and becomes locked.

Therefore, the lid body 23 will not open unless the locked protrusion 25 and the locking piece 27 are unlocked.

If the incomplete release operation button 37 is pressed without operating the stop button in the reproducing state, the locking piece 27 rotates clockwise in FIG. The portion 31 is removed and the lid 23 is unlocked.

When the lid body 23 is closed, the coil spring 29 is in a compressed state as shown in FIG. 4, and a biasing force is applied to the lid body 23 in the opening direction. The rod 28 is attached to the flange 4 as shown in FIG.
1 moves upward at 1 limited to the upper surface portion 38b of the U-shaped support member 38, and the lid body 23 is pushed up by the rod 28, and the lid body 23 is opened incompletely as shown by the dashed line in FIG. It is released with a button.

This incompletely opened position is such that a fingertip can be placed on the end surface of the lid 23, for example, the opening interval of the tip of the lid 23 is about 2 cm.
It is desirable to do so.

Further, by the movement of the rod 28, the pressing of the microswitch 30 by the rod 28 is released, as shown in FIG. 5, and a braking circuit for the motor 8 is formed.

Further, the projection of the light beam from the light beam projection device and the movement of the scanning device are stopped.

As described above, the braking mechanism (electrical braking in this embodiment) of the motor 8 operates in conjunction with the incomplete opening operation of the lid 23, so that while the lid 23 reaches the incomplete opening position shown by the dashed line, The rotational speed of the recording medium 1 decreases to some extent.

However, in this incompletely opened position, it is impossible to attach or detach the recording medium 1 due to the position.

Since the playback device is normally operated by a person, the operation button 37
It is practically impossible to simultaneously perform this operation and the manual opening operation of the lid body 23 from the incompletely opened position to the fully opened state.

Therefore, after some time has elapsed since the operating button 27 was operated, the operator puts his/her hand on the lid 23 and opens the lid 23 from the incompletely opened position shown by the dashed line in FIG.

In this way, the lid body 2 is moved from the incomplete open position to the fully open position 1.
3, the rotational speed of the recording medium 1 further decreases,
When it is opened at the fully open position, it will be in a rotating state with almost no danger.

Therefore, there is no danger even if the disk recording medium 1 is attached or detached in the completely open state.

Furthermore, since the lid 23 is not opened suddenly, the influence of negative pressure on the disk recording medium 1 is prevented.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be further modified.

For example, when the motor 8 is not configured to brake electrically and the microswitch 30 is actuated in conjunction with the opening of the lid, the electromagnetic plunger is deenergized and the brake drum coupled to the disc drive motor 8 is The band brake, which has been separated by the electromagnetic plunger, may be brought into pressure contact with the brake drum by the action of a spring, thereby applying the brake.

Further, as illustrated in FIGS. 6 and 7, a cam 43 is attached to the pivot shaft 42 of the lid 23, and a brake drum 44 is connected to the motor 8, so that when the lid 23 is closed, the cam 43 protrudes. The section moves the connecting rod 45 in the direction of the drawing, thereby causing the connecting rod 45 to move the brake band 47 away from the drum 44 against the braking spring 46, and on the other hand, when the lid body 23 is opened, the restriction by the cam 43 is When released, the connecting rod 45 may be moved to the right in the drawing by the force of the spring 46, and at the same time the brake band 47 may be brought into pressure contact with the drum 44 by the force of the spring 46.

Further, the incomplete opening mechanism and locking mechanism of the lid body 23 may be modified.

Furthermore, the lid 23 may not be completely opened manually, but may be opened using a spring or other means.

It is also applicable to playback devices other than optical playback devices, or optical or other recording devices.

[Brief explanation of the drawing]

FIG. 1 is a front view illustrating a conventional optical reproducing device;
FIG. 2 is a plan view illustratively showing a recording medium, FIG. 3 is an enlarged sectional view of the recording medium, and FIG. 4 is a partially longitudinal side view illustrating an optical reproducing apparatus according to an embodiment of the present invention. Figure 5 is a perspective view showing the incomplete lid opening device of the device shown in Figure 4, Figure 6 is a side view illustrating a modified example of the brake mechanism, and Figure 7 is a part of Figure 6. FIG. In the symbols used in the drawings, 1 indicates the recording medium;
6 is a turntable, 8 is a motor, 9 is a light beam, 10
2 is a light beam projection device, 21 is a main body, 23 is a lid, 25 is a protrusion to be locked, 27 is a locking piece, 2B is an incompletely opened frame, 29
is a coil spring, and 30 is a micro switch.

Claims (1)

[Claims for Utility Model Registration] A motor 8 for rotating a disc-shaped recording medium 1; a turntable 6 for rotating a recording medium coupled to the motor 8; and a method for recording information signals on the disc-shaped recording medium 1 or a recording or reading device that reads information signals from the disc-shaped recording medium 1; a container body 21 that accommodates the motor 8, the turntable 6, and the recording or reading device; and the disc placed on the turntable 6. It is rotatably attached to the container body 21 so as to be rotatable between a closed position covering the disc-shaped recording medium 1 and a fully open position in which the disc-shaped recording medium 1 can be freely attached to and detached from the turntable 6. a lid 23 for maintaining the lid 23 in the closed position;
a locking portion provided on the container body 21 for engaging with the locking portion and keeping the lid 23 in the closed position; The lid body 23 is closed in the closed position.
Although it is possible to apply a biasing force in the lid opening direction to the lid body 23 and to put a finger on the open end of the lid body 23 by the biasing force when the engagement between the locked part and the locking part th is released. ,
A disk recording or reproducing apparatus comprising a spring 29 that opens the lid body 23 at a partially opened position in which the disk-shaped recording medium 1 cannot be attached or detached.