JPH02195521A - Information recorder - Google Patents

Abstract

PURPOSE:To miniaturize an information recorder by fixing a driving means and an optical head on a main chassis and making the optical path of incident light on a reflecting mirror just under the objective lens of the optical head in the tangent direction of the track of the information recording medium. CONSTITUTION:The driving means 5 and the optical head 2 are fixed on the main chassis 1 and the optical path of the incident light on the reflecting mirror just under the objective lens 4 of the optical head 2 is made in the tangent direction of the track of the information recording medium 11. In such a case, the objective lens 4 can mainly move in the radial direction of the optical disk 11 only by a lens actuator 3. Therefore, laser light can be tracked on the track of the optical disk and read and write actions can be possible. Thus, the information recorder is constituted to be small.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an information recording device using light such as a laser.

<Summary of the Invention> The present invention uses only a lens actiniator as a means for aligning a laser beam with a track of the information recording medium, eliminates a large tracking means, and provides a small and inexpensive information recording device. This is what we are trying to provide.

<Conventional technology> The conventional technology will be explained using FIGS. 4 and 5.

Figure 4 shows an assembled plan view of the main parts, and Figure 5 shows a partially assembled sectional view of Figure 4. In the figure, 1 is the main chassis, which is the frame of the optical information recording device. 2 is the optical head, which is precisely positioned in two directions: the thickness direction and the radial direction of the optical disk 11, which is the information recording medium. It is composed of an adjustable binary actuator 3, an objective lens 4 provided on the binary actuator 3, a reflecting mirror 15, and a laser element 16. 5 is a spindle motor that is a driving means for the optical disc 11; 6 is a spindle motor that is a driving means for the optical disc 11; and 6, the spindle %-
The spindle holder fixed to the 9-piece also has the function of positioning the center of the optical disk 11. 20 is a laser beam, 30 is a VCM coil, and 31 is a VCM yoke.

The operation will be explained.

The VCM coil 30 is fixed to the helad 2,
As is well known, it cooperates with the yoke 31 of the VCM.

Further, the head 2 is guided by a rail (not shown) fixed to the main chassis 1, and receives force from the coil 30 of the VCM, and receives the force from the coil 30 of the VCM.
It is possible to move back and forth in a straight line between B. A laser beam 2o is emitted from a laser element 16, reflected by a reflecting mirror 15, and condensed by an objective lens 4, so that the laser beam is focused on a recording layer of the optical disc 11 with a recording film.

At this time, the optical disk 11 is held and rotated on the spindle motor by a well-known clamping means (not shown). It is well known that the optical disc 11 is provided with a large number of spiral tracks, and is controlled by another control means (not shown) so that the laser beam 20 accurately follows the tracks. It is as follows. When the laser beam 20 passes through the recording layer or is reflected, an optical sensor (
(not shown) to detect brightness and darkness and read information.

A write operation for recording information will be explained.

When recording information, the bias coil 12 is energized.

At this time, the magnetism generated by the bias coil 12 is
The magnetism is configured to be in the opposite direction to the initial state of magnetism of the recording layer of the optical disc 11.

The laser light 20 is blinked depending on the presence or absence of information. Then, the recording film is heated by the laser beam 20 only at the location where information exists, and the temperature exceeds the Curie point.

When the recording film cools down from the temperature, the bias film 12
It is held in the magnetism generated by 0. Information recorded in this manner can be read by the read operation described above. 1
4 is a holding means for the bias coil 12.

As described above, the head 2 moves between 2A and 2B corresponding to the innermost track and outermost track of the optical disc 11 under the control of the VCM.
In order to quickly and accurately irradiate the track with the laser beam 2o, a lens actiniator called the binary actuator 3 is generally provided.

The two-dimensional actuator can move the objective lens 4 up and down in FIG. 5, and can also move it left and right within the range A, as shown by the imaginary line in FIG.

As described above, the objective lens 4 is roughly positioned by the VCM, accurately positioned by the binary actuator 3, and quickly ON-tracks to the track that requires reading or writing.

Problems and Objects to be Solved by the Invention> As mentioned above, the conventional optical information recording device can record and reproduce the optical disc 11 over a wide range from the innermost circumference to the outermost circumference within the possible range. Since the head 2 was configured to seek, read, and write, the VCM and main chassis 1 were made longer in the left and right direction as shown in Figure 4 so that the head 2 could move within the range of 2A and 2B. I needed to set it up. For this reason, the information recording device becomes large, making it inconvenient to incorporate it into a portable device. Further, in the case of an optical information recording device, since the information recording density is high, even if the recording range of the optical disk 11 is small, it is possible to easily secure a capacity equivalent to that of a well-known floppy disk drive or hard disk drive. In the case of an optical information recording device, since it is possible to set the disk 11 and the disk 11 in a non-contact state, it is possible to use a low-power spindle motor.
From this point of view as well, configuring the optical information recording device as in the present invention is optimal as an information recording device for small portable equipment.

<Means for solving the problem> Consists of an information recording medium, a drive means for the information recording medium, an optical head, and a main chassis, n WE drive means and the optical head are fixed to the main chassis,
An information recording device characterized in that an optical path of light incident on a reflecting mirror directly below an objective lens of the optical head is substantially tangential to a track of the information recording medium.

<Operation> Since the present invention is constructed as described above, the objective lens can be moved in the radial direction of the optical disc only by the lens actuator. In this way, the laser beam can be ON-tracked to the track of the optical disc, and the above-mentioned read and write operations can be performed.

<Example> An example of the present invention will be described in detail with reference to FIGS. 1 and 2.

Fig. 1 is an assembled plan view showing an embodiment of the present invention, Fig. 2 is an assembled sectional view of Fig. 1, and in all the figures, 1 is a main chassis that is the frame of the information recording device. , is an optical head, and the head 2 is equipped with a binary actuator 3 equipped with an objective lens 4, a reflecting mirror 15, and a laser element 16.

Further, the dome 8 includes a binary actuator 9 provided with an objective lens 10, a reflecting mirror 17, and a laser element 18.

5 is a spindle motor; 6 is a spindle; 7 is a disk set screw for fixing the optical disk 11 to the spindle motor 5; and 12.13 is a bias filter, which is fixed to the fill stand 14.

The operation will be explained.

In the present invention, the head 2 is fixed to the main chassis 1. Further, the spindle motor 5 is similarly fixed to the main chassis 1. Further, the optical disc 11 is fixed to the upper part of the spindle motor 5 by a disc set screw 7. The optical disc 11 is provided with tracks as in the conventional disc. However, the tracks of the disk 11 are limited to a certain section on the outer periphery, which is narrower than the conventional range.

Read operation will be explained.

Laser light 2° emitted from the laser element 16 is reflected by the reflecting mirror 15, narrowed down by the objective lens 4, and focused on a recording layer of the optical disc 11 with a recording film. Also,
Another control means (not shown) controls the laser beam 2o.
is racked ON) on the track lla. This is because, under the control of the control means, the objective lens 4 is precisely positioned within a range A shown by imaginary lines in the radial direction of the optical disc 11, as shown in FIG. The head 8 has exactly the same effect as the head 2, but the head 8 is arranged inside the optical disk 11 than the operating range of the head 2, and is centered around track The range can be read and written.

If information is recorded on a predetermined track of the first disk 11, the laser beam 2o passes through the recording layer;
Alternatively, when reflected, the plane of polarization of the light is rotated by the Kerr effect and Faraday effect, and by detecting this laser light with an optical sensor (not shown), the presence or absence of information can be detected as the brightness or darkness of the light. .

Write operation will be explained.

When attempting to write, the bias coil 12 is energized on a predetermined track. At this time, the magnetism generated by the bias coil 12 is made to be in the opposite direction to the polarity of the recording film of the optical disk 11 in its initial state. Then, the laser beam 2o is blinked depending on the presence or absence of information. Then, when the area heated by the laser beam 20 and exceeding the Curie point cools down again, the magnetism generated by the bias coil is maintained. This action allows information to be recorded. When reading this recorded information, the read operation described above is used.

When erasing information, the bias coil 12
The polarity of the recording layer of the optical disk 11 may be the same as the initial state by applying current to the optical disc 11, and the laser beam 20 may be kept emitted.

<Effects of the Invention> Since the present invention is configured as described above, it has the following effects.

Since the head 2.8 is fixed to the main chassis 1 and does not move, the size and shape of the main chassis 1 shown in FIGS. 1 and 2 can be set compactly.

That is, it can be formed of a rectangle that is approximately concentric with the outer diameter of the first disk 11, which is an information recording medium, and circumscribes the outer diameter of the optical disk 1 or the diameter of a circle that is slightly larger than the outer diameter.

Since the size of the main chassis 1 is almost equal to the size of the information recording device, according to the present invention, the size of the information recording device can be set to be smaller than that of the conventional type, and the size of the information recording device can be set to be smaller than that of the conventional type. This is advantageous as a recording device. In addition to the above, since the optical path of the laser beam is set in the tangential direction of the track, it is possible to reduce the amount by which the blade 2.8 protrudes from the outer shape of the optical disk. This is because, in general, the length of the head from the laser elements 16, 18 to the reflecting mirror 15, 17 is very long, so when the direction of the optical path is arranged in the radial direction of the optical disk, the rear part of the head is Since the head protrudes from the outer shape of the disk, the main chassis 1 including the head becomes large. When configured as in the present invention, the main chassis 1 can be set small even if the head is somewhat large, and therefore the information recording apparatus can also be configured small. In this configuration, since the head 2.8 does not move, the recording range of the optical disc 11 is narrower than in the conventional type, but as described above, in the case of an optical information recording device, the recording density is high. , there are many practical uses that are useful even in a narrow recording range.

Further, in the present invention, the optical disk 11 is also fixed to the spindle motor 5, but by doing so, the loading structure (not shown) seen in the conventional type is unnecessary, and the thickness of the information recording device can be reduced. It has the effect of This is also effective for undesirable portable devices.

Furthermore, in one embodiment of the present invention, a plurality of heads are used, and by configuring each head in this way, each head can be used as a lead,
It is also possible to use it with different functions for writing and erasing, and by doing so, the operating time of the information recording device can be shortened, and by separating the recording ranges in which the two heads 2.8 act. It is also possible to widen the recording range on one disc, and by doing so, the recording capacity can be expanded. In addition, since conventional heads are movable, when vibrations or shocks are applied to the information recording device, the head tends to move due to the amount of N in the head (the positioning of the objective lens may become erroneous, but with the present invention, For example, since the weight of the movable part of the head is reduced, positioning accuracy is stabilized and the characteristics of the information recording device against vibrations and shocks can be improved.

One embodiment of the present invention has been described in detail, and an application example of the present invention will be described with reference to FIG. FIG. 3 is a partially assembled sectional view showing an example of application of Herad 2.

The difference from the first embodiment is that a rotatable tracking prism 15 is used instead of the reflecting mirror. Since the tracking prism 15 can be rotated left and right by separate rotation means and control means (both not shown), the laser beam emitted from the laser element 16 can move in the radial direction of the optical disc 11, and this tracking By the operation of the prism 15, the above-mentioned track is racked.

With this configuration, it is also possible to widen the recording range with one head 2. The focus direction is determined by the focus actuator 3.

In this way, effects similar to those of the present invention can be achieved.

Although one embodiment and one application example of the present invention have been described above, the present invention can also be applied as follows. The shape of the main chassis 1 does not need to be a square, but may be a polygon circumscribed by a circle approximately equal to the outer diameter of the disk. Also, to the above, whether there is one C or two C,
There may be any number. Furthermore, the disk may be fixed to the spindle motor as required.

Additionally, in one embodiment of the invention, the laser element 16.18
Although the optical path from the laser element 16.18 to the reflecting mirror 15.17 is constructed in a straight line as shown in FIG. 2, the optical path is not limited to this. It may be constructed as a type in which a prism (not shown) is provided to refract the optical path.

Even if configured in this way, it does not depart from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is an assembled plan view showing an embodiment of the present invention, FIG. 2 is an assembled cross-sectional view of FIG. 1, FIG. 3 is a partially assembled cross-sectional view showing an application example of the present invention, and FIG. FIG. 5 is an assembled plan view showing the structure, and FIG. 5 is an assembled cross-sectional view of FIG. 4. l...Main chassis 2...Head 4...Objective lens 5...Spindle motor 11...Optical disk 12.13 Bias coil and above Applicant: Seiko Epson Corporation Representative Person Patent attorney Upper Comb Noise and 1 other person

Claims (1)

[Claims] It consists of an information recording medium, a driving means for the information recording medium, an optical head, and a main chassis, and the driving means and the optical head are fixed to the main chassis, and the reflection directly below the objective lens of the optical head. An information recording device characterized in that an optical path of light incident on the mirror is substantially tangential to a track of the information recording medium.