JPS62287432A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To always record and reproduce data with a high reliability by fixing an optical head without troublesome works at the time of non-driving of an optical head to reduce the influence like a shock applied from the external. CONSTITUTION:An optical head fixing device 6 provided near the side face part of a case 2 of an optical head 1 stops movement of the optical head 1 in the direction of an arrow B-B' and fixes it and has an elastic member 7 which is supported rockably in the direction of an arrow A-A'. The elastic member 7 is supported by a motor shaft 9 of a stepping motor 8 and is freely rocked in the direction of the arrow A-A' by the driving force of the motor 8. When a head fixing command is inputted to this device, the stepping motor 8 is rotated at an angle x deg. in the direction of an arrow A, and the elastic member 7 is brought into contact with the optical head 1 with a proper pressure to fix the head. After the optical head 1 is fixed, the optical information recording and reproducing device is moved to a desired position by carrying.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Application Field] The present invention includes a movable optical head and optically records and/or reproduces information.1. The present invention relates to an optical information recording/reproducing device that performs and/or erases information.

[Conventional technology]

Along with the development of today's optoelectronics, optical information recording and reproducing devices that can randomly record, reproduce, and/or erase audio or image information with high performance using light beams such as laser beams have been commercialized. There is.

A conventional example of such an optical information recording/reproducing device will be explained using FIG. 7 as an example. Incidentally, FIG. 7 is a schematic side view for explaining the outline of the optical information recording/reproducing apparatus. In FIG. 7, a magneto-optical disk 121 is rotated by a motor 123 via a spindle 122 at a predetermined speed. In the writing system shown in the right half of the figure, a laser beam emitted by a self-modulated semiconductor laser 101 is collimated by a collimator lens 102 and enters a polarizing beam splitter 1.03. Polarizing beam splitter 1
03 is configured to transmit P-polarized light and reflect S-polarized light. Since the polarization direction of the semiconductor laser 101 is arranged parallel to the paper surface, the beams pass through the polarization beam splinter 103, enter the A wavelength plate 104, become circularly polarized light, and are converted into circularly polarized light by the reflection mirror 105. °Polarized. Furthermore, the beam enters the objective lens 106 and is directed to the disk 121.
is imaged on the surface of the disk 121, and the magnetization direction of the surface perpendicular magnetization film in that portion of the disk 121 is reversed as described above. The beam reflected from the disk 121 passes through the lens 106 and the mirror 1.
05, it is converted into S-polarized light by the × wavelength plate 104, reflected by the polarizing beam splitter 103, and incident on the detector 108. The light incident on the detector 108 is photoelectrically converted and used as a servo signal Sr (autofocus) to keep the objective lens in focus at all times.

A reading system to which the three-beam method is applied is shown in the left half of FIG.
The polarization is improved by the polarizing plate 111, and the grating 1
Divided into three by 12. These beams pass through a half mirror 113, are reflected by a tracking mirror 114, and are imaged by an objective lens 115 on the surface of the disk 121 as three beam spots. disk 12
1, the polarization direction of these light beams is rotated by the Kerr effect, passes through an objective lens 115, is reflected by a tracking mirror 114, a half mirror 113, is further divided into two by a half mirror 116, and is passed through a polarizing plate 117. 1
18 and detectors 119a, 119b, 119
photoelectrically detected by c and 120. Polarizing plate 117
and 118, the polarization direction is set at a predetermined angle (for example, 9
The difference is 0゛).

The three beam spots imaged on the surface of the disk 121 include a central spot and two beam spots that are point symmetrical with respect to the central spot.
When the center spot is correctly positioned on the recording bit string, the spots on both sides cover the recording bit string by about half the spot diameter. Therefore, at this time, the intensity of the reflected light from both spots is are the same, but when the central spot deviates from the recording bit string, there is a difference in the intensity of reflected light from the spots on both sides, making it possible to detect a tracking error.

The reflected light from the central spot is a detector 119b.

The information reproduction signal S is separated and the difference thereof is extracted, and a signal for focusing control (not shown) is detected by a known method. On the other hand, the reflected light from the spots on both sides is reflected by the detectors 119a and 119c.
The signals are photoelectrically detected and differentiated, and then extracted as the tracking signal Sv as described above.

Based on the tracking signal SA obtained in this way, the tracking mirror 114 or the objective lens 115 is moved to the disk 1.
By moving in the radial direction of 21, tracking control, that is, tracking, is performed so that the central beam spot for recording and reproduction is always kept on the recording bit string.

Next, FIG. 8 shows an example of an optical system driving device that performs such focusing and tracking.

In the figure, 31 is a base to which yokes 33 and 37 are fixed, 32 is a through hole through which the laser beam passes, and 34 is a magnet that forms a magnetic field to drive the lens holder 44 in the optical axis direction.
35 is an optical axis direction driving coil, 36 is a coil for driving the lens holder in the horizontal direction, and a magnetic circuit for this is formed by a yoke 37 and a magnet 38. 39-4
2 is a support spring that holds the lens holder 44 in a movable range, 43 is a connection between each support spring, and 45 is a lens that focuses the laser beam onto the medium surface. With the above configuration, the coil 35
．． By energizing 36, the lens 45 is driven in the optical axis direction and the horizontal direction by interaction with the magnets 34 and 38, and the focus and horizontal position of the laser spot light are controlled.

As mentioned above, since the optical head has many fixed parts that are precisely adjusted, care must be taken to avoid applying shock to the optical head when transporting the optical information recording/reproducing device. is necessary. Therefore, conventionally, when transporting an optical information recording/reproducing device, a method has been adopted in which the case body, etc., in which the optical head is housed, is fixed from the back side of the device body using means such as screws.

[Problem that the invention seeks to solve]

However, with the above-mentioned fixing method, not only is the work of fixing the optical head cumbersome, but sometimes forgetting to fix the optical head may cause shock to the optical head, causing damage to various objects including the detector. There have been problems in that the spacing between optical components is distorted, making it impossible to obtain predetermined servo and signals.

In addition, in the above conventional example, the type that separates recording and reproducing is explained, but in the same way, it is necessary to prevent shocks from being applied especially when transporting an integrated optical head that can perform recording and reproducing. The same can be said not only for optical heads for magneto-optical disks but also for optical heads for general optical disks.

〔the purpose〕

The present invention was made in view of the problems of the prior art described above, and its purpose is to fix the optical head without any complicated work when the optical head is not driven, and to reduce the effects of external shocks, etc. and always maintain highly reliable records.
An object of the present invention is to provide an optical information recording and reproducing device that enables reproduction.

[Means for solving problems]

According to the present invention, in an optical information recording/reproducing apparatus having a movable optical head, the fixing member limits the movement of the optical head by coming into contact with the optical head; A biasing means that constantly biases the fixing member in a direction in which it contacts the optical head, and a drive means that resists the biasing means and retreats the fixing member to a position where it does not come into contact with the optical head when the optical head is moved. This is achieved by an optical information recording/reproducing device characterized by:

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the optical information recording and reproducing apparatus according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of an optical head and an optical head fixing device provided in an optical information recording/reproducing apparatus according to the present invention, and FIG. 2 is a side view of FIG. 1.

As shown in the figure, the optical head l has a rectangular case 2. Inside the case 2, an optical system driving device as shown in FIG. 8 is provided. Further, numeral 3 shown in the figure is an objective lens, and the focus direction and tracking direction of the objective lens 3 are controlled by the optical system driving device.

Further, the entire case 2 of the optical head 1 is supported by two guide rails 4.5 so as to be movable in the direction BB' shown in the figure. The BB' direction is provided along the radial direction of a disk (not shown) that is an information recording medium.

Further, as shown in the figure, an optical head fixing device 6 is provided near the side surface of the case 2 of the optical head 1. The optical head fixing device 6 is provided to stop and fix the movement of the optical head 1 in the BB' direction. As shown in the figure, the optical head fixing device 6 includes A-A'.
It has an elastic member 7 supported so as to be swingable in the direction.

The elastic member 7 is made of a member (for example, rubber) that can fix the case 2 of the optical head 1 when a part thereof comes into contact with the case 2. The elastic member 7 is supported by a motor shaft 9 of a stepping motor 8, and is driven by the driving force of the motor 8 as shown in the figure.
It is freely swingable in the A' direction. Further, as shown in the figure, the optical head fixing device 6 of this embodiment has an elastic member 7 at one end.
It has a one-tension coil spring 10 which is connected to an optical information recording/reproducing device (not shown) at the other end. A force acting on the elastic member 7 to constantly rotate it in the direction A is exerted by the coil spring 10.

The above is the explanation of the configuration of this embodiment. In the above embodiment, the elastic member 7 of the stepping motor 8 is A'.
The driving force for turning in the direction is generated by the elastic part of the tension coil spring 10,
It is assumed that the tensile force is greater than the tensile force that attempts to rotate the material 7 in the A direction.

Next, the operation of the optical head fixing device having the above configuration is as follows.
This will be explained based on FIG. Incidentally, FIG. 3 is an explanatory diagram for explaining the operation of the optical head fixing device when the power of the optical information recording/reproducing apparatus is turned on.

As shown in Figure 3, the power of the optical information recording/reproducing device is turned on.
Sometimes, when it is desired to transport the device to a certain position, the optical head installed in the optical information recording/reproducing device must be fixed.
Set the "open" mode to "fixed" and input a "head fixed" command to the device.

Then, the stepping motor 8 rotates X' in the direction A, and the elastic member 7 contacts the optical head 1 with appropriate pressure to fix the head. After fixing the optical head 1, the optical information recording/reproducing device is transported to a desired position.

After the movement of the optical information recording and reproducing device is completed, in order to automatically control the optical head 1, the “fixed-open” mode of the optical head provided in the device is set to “open”, and the device is set to “head open”. Enter the command. Then, the stepping motor 8 rotates by X° in the direction A', and the elastic member 7 is disengaged from the optical head 1, making the head movable, that is, open.

As described above, the present invention allows the optical head to be "fixed and released" freely when the power of the optical information recording/reproducing apparatus is on.

In this embodiment, when the power of the optical information recording/reproducing apparatus is turned off, the tension coil spring 10
The elastic member 7 is always in contact with the case 2 of the optical head 1 due to the tensile force of
It always remains fixed in time.

Next, another embodiment of the optical head fixing device according to the present invention will be described using FIGS. 4 to 6.

Note that FIGS. 4, 5, and 6 correspond to FIGS. 1, 2, and 3 of the aforementioned embodiment, respectively. That is,
FIG. 4 is a perspective view showing another embodiment of the optical head and optical head fixing device disposed in the optical information recording/reproducing apparatus according to the present invention, and FIG. 5 is a side view of FIG. 4. , FIG. 6 shows the optical information recording/reproducing device when the power is turned on.
FIG. 3 is an explanatory diagram for explaining the operation of the optical head fixing device.

As shown in FIGS. 4 and 5, the optical navel fixation device 12 of this embodiment is almost the same as that of the previous embodiment.

The difference is that a clutch 14 is provided between the elastic member 7 and the stepping motor 8.

Hereinafter, the operation of the optical head fixing device 12 when the power of the optical information recording/reproducing apparatus is turned on will be explained based on FIG. 6.

As shown in Figure 6, the power of the optical information recording/reproducing device is turned on.
Sometimes, when you want to transport the device to a certain position, the optical head installed in the optical information recording/reproducing device is
Set the "Fixed-Release" mode to "Fixed" and input the "Head fixation" command to the device. Then, the clutch 14
is turned off, and the elastic member 7 is made rotatable in the direction AA'. The elastic member 7 includes a tension coil spring 1.
Since one end of the spring 10 is connected, the tensile force of the spring 10 causes the elastic member 7 to rotate by X° in the A direction. and,
The elastic member 7 contacts the optical head 1 with appropriate pressure to fix the head.

After fixing the optical head 1, the optical information recording/reproducing device is moved to a desired position.

After the movement of the optical information recording and reproducing device is completed, in order to automatically control the optical head 1, the “fixed-open” mode of the optical head provided in the device is set to “open”, and the device is set to “head open”. Enter the command. Then, the clutch 14 is turned on and the stepping motor 8 and the elastic member 7 are connected. Then stepper motor 8
is rotated by X° in the A' direction, and the elastic member 7 is detached from the optical head 1, making the head movable, ie, open.

Also, in the above embodiments, similarly to the above embodiments,
When the power of the optical information recording/reproducing device is turned off, the elastic member 7 is always in contact with the case 2 of the optical head 1 due to the tensile force of the tension coil spring 10, and as a result, the optical head 1 , is always fixed when the information recording medium is powered off.

Furthermore, the present invention is applicable not only to optical heads for magneto-optical disks, but also to optical heads for magneto-optical disks.
Of course, the present invention can also be applied to optical heads for general optical discs.

Furthermore, in the above two embodiments, the elastic member 7 needs to have a sufficient length in the BB' direction in order to be able to contact and fix the elastic member 7 no matter where the optical head 1 is located. It is.

Further, in the above two embodiments, the optical head □ is fj
Although the explanation has been given by taking as an example the case where an optical information recording/reproducing device is transported while the power is on, the present invention does not need to be applied to this case, and the present invention does not need to be applied to this case. In other words, the optical head is in a movable state even when no recording or playback is being performed, and the head is susceptible to shocks even in this case, and it goes without saying that the present invention is effective in this case as well. Nor.

〔Effect of the invention〕

As described above in detail and concretely, according to the present invention, the optical head can be fixed without any complicated work when the optical head is not driven, and the influence of external shocks etc. is reduced, so that the optical head can always be reliable. It becomes possible to perform recording and playback with high accuracy.

[Brief explanation of drawings]

1 and 4 are perspective views of the optical head and the optical head fixing device, and FIGS. 2 and 5 are perspective views of the optical head and the optical head fixing device, respectively.
3 and 6 are explanatory views for explaining the operation of the optical head fixing device, FIG. 7 is a schematic side view of the optical information recording and reproducing device, and FIG. 8 is an optical system drive device. FIG. DESCRIPTION OF SYMBOLS 1... Optical head, 4, 5... Guide rail, 6°12... Optical head fixing device, 7... Elastic member, 8
...Stepping motor, 10...Tension coil wire. Agent Patent Attorney Johei Yamashita Figure 7 Figure 8

Claims (1)

[Claims] (1) In an optical information recording/reproducing device equipped with a movable optical head, a fixing member that limits the movement of the optical head by coming into contact with the optical head, and a direction in which the fixing member comes into contact with the optical head. An optical system comprising: a biasing means that always biases the optical head; and a drive means that resists the biasing means and retreats the fixing member to a position where it does not come into contact with the optical head when the optical head is moved. Information recording and reproducing device.