JPH06150424A - Magneto-optical information processor - Google Patents

Abstract

PURPOSE:To provide a magneto-optical information processor which is miniaturized and reduced in weight. CONSTITUTION:The processor is provided with an optical head 400 receiving two beams which is polarized and separated with PBS 44 by two photodetectors 51 and 52 having the normal lines of light receiving surfaces in almost same directions, a magnetic head 300, a spindle motor 200 moving a recording medium 1 and a linear motor 900 moving the optical head 400 in the direction perpendicular to the direction along a recording track.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus for recording or reproducing information magneto-optically.

[0002]

2. Description of the Related Art Conventionally, a magneto-optical recording / reproducing apparatus (hereinafter referred to as MO driver) is known in which a disk made of a magnetic material such as GdFeCo or TbFeCo is magnetized in a perpendicular direction to record information, and the information is read. There is. Such an MO driver records information by irradiating a disk with a laser beam to give energy above the Curie point to the disk so that magnetism corresponding to the magnetic direction of the external magnetic field is applied in the perpendicular direction of the disk. Further, the information recorded on the disc is read by utilizing the fact that the plane of polarization of the laser beam slightly rotates due to the Kerr effect according to the magnetic direction of the disc. Detect changes in components.

FIG. 1 is a block diagram showing an example of the structure of such an MO driver. In the figure, a magnetic field modulation type MO driver is illustrated. In the figure, a disk 1 is rotated by a spindle motor 2, and an optical head 100 for irradiating a laser beam is provided on the recording surface side (the lower surface in the figure) of the disk 1 on the side opposite to the recording surface (the figure). Magnetic heads 300 that generate an external magnetic field are provided on the upper surface of FIG. The optical head 100 is moved in the radial direction of the disk 1 by a carriage (not shown). The optical head 100 includes a semiconductor laser diode (hereinafter referred to as LD) 11 for emitting a laser beam, a collimator lens 15 for making the divergent light emitted from the LD 11 into a substantially parallel light beam, and a plurality of diffracted light beams. A grating element (hereinafter referred to as a grating) 16 that branches off is provided. Grating 1
The emitted light via 6 is guided to the objective lens 15 via the beam splitter 13 and is condensed on the disc 1.

The grating 16 is necessary when the well-known 3-beam method is used as the tracking servo method, and the grating 16 is provided when the 1-beam tracking servo method such as the push-pull method is used. No need. On the other hand, the reflected light reflected by the disk 1 is guided to the beam splitter 13 via the objective lens 15, has its optical path bent, and then is incident on the λ / 2 plate 17 to rotate the polarization plane by 45 °. The reflected light is further converted into a converged light flux by a condenser lens 18, is given astigmatism by a cylindrical lens 19, and is guided to a polarization beam splitter (hereinafter referred to as PBS) 14. P
The BS 14 transmits, for example, the P-polarized light component of the reflected light, reflects the S-polarized light component, separates the respective light components, and the separated respective light components of the polarized light components are guided to the light receiving elements 20 and 21, respectively.

FIG. 2A shows the positional relationship between the light receiving elements 20 and 21 and the PBS 14 when viewed from the direction A in FIG. The information recorded on the disc 1 is obtained by calculating the difference between the output of the light receiving element 20 and the output of the light receiving element 21, and one of the light receiving elements (the light receiving element 20 in the illustrated example) is appropriately divided, An error signal required for focus servo, tracking servo, etc. is generated from the distribution and intensity of the received beam.

Here, of these optical heads 100, an optical system from the collimator lens 15 through the beam splitter 13 to the objective lens 15 is called a condensing optical system, and after reflecting the beam splitter 13, The optical system up to the light receiving elements 21 and 22 is called a light receiving optical system.

On the other hand, the magnetic head 300 is provided with a coil 31 for giving an external magnetic field and a driver 32 for giving a current flowing through the coil 31, and the driver 32 is based on the modulation signal modulated by the encoder 33. The polarity of the current supplied to 31 is controlled.

[0008]

As described above, in the optical head device in the conventional MO driver, the reflected light is separated by the PBS 14 in a direction substantially orthogonal to the light receiving element 20 and the light receiving element 21 in the separated direction. Therefore, it is not only complicated to assemble and arrange both light receiving elements, but also the size of the entire optical head is inevitably increased. As a result, the cost of the conventional MO driver is high, and the MO driver itself is inevitably large and heavy.

Further, in order to reduce the size, the λ / 2 plate 17
Can be omitted, but in this case the PBS14
In order to tilt the plane of polarization for the
In this case, as compared with the height h1 (FIG. 2A) when the λ / 2 plate 17 is used as shown in FIG.
Has the drawback of becoming large.

Further, the LD 11 and the collimator lens 15
It is also considered to arrange a light receiving optical system between the above and the above to reduce the overall size. That is, as shown in FIG.
The beam splitter 13 is provided between the D11 and the collimator lens 15 to separate the reflected light from the disk 1 and guide the separated reflected light to the PBS 14.

However, since a holding member and a substrate for holding the optical elements are required, in the structure shown in FIG. 3, the light receiving elements 21 and 22, or the light receiving element 21 and the beam splitter 13 are mutually arranged. Interference (meshed part of the figure) does not allow design freedom. Further, the substrate holding the light receiving element 21 may interfere with the light flux emitted from the LD 11.

As described above, in order to prevent the mutual interference of the optical elements, it is conceivable to use the concave lens 20 as shown in FIG. 4, but in the end, the size of the device is increased, and the number of parts is increased. And an adjustment process increase, which causes a cost increase. Therefore, a method of arranging the two light receiving elements 21 and 22 on the same plane is also considered. That is, the Wollaston prism 23 shown in FIG. 5 is used instead of the PBS 14 in the example of FIG.
Separating the P and S polarization components in the same direction,
The light receiving elements 21 and 22 are arranged in a plane on the extension of the light flux of the P-polarized component and the extension of the light flux of the S-polarized component. However, even in such a method, not only is the Wollaston prism 23 expensive, but the P separated by the Wollaston prism 23 is also increased.
The angle θ formed by the light flux of the polarization component and the light flux of the S polarization component is
Since it is an extremely minute angle of about 1 ° ± 0.03 °,
Unless the distance between the Wollaston prism 23 and each of the light receiving elements 21 and 22 is sufficiently long, the light receiving elements 21 and 22 cannot be arranged side by side, which is not suitable for downsizing.

In the example of FIG. 3, since the optical path length is limited by the focal length of the collimator lens 12, it is very difficult to use the Wollaston prism 23.

The present invention has been made in order to overcome the problems of the prior art, and is suitable for downsizing and weight reduction of the optical head, and is easy to assemble and adjust, so that the optical head is low in cost and small in size. -The purpose is to provide an optical head device of a lightweight MO driver.

[0015]

A magneto-optical information processing apparatus according to the present invention comprises an optical head, a recording medium moving means, and an optical head moving means. The optical head emits light, and the light emitting element. An objective lens that collects light emitted from the recording medium and receives reflected light from the recording medium, and that reflects light reflected from the recording medium that is arranged between the light emitting element and the objective lens. A reflected light separation element that separates the light from the light emitting element to the optical recording medium from the optical axis by transmitting the light, and two polarizations that are orthogonal to each other by partially reflecting the separated light and partially transmitting the separated light. Direction separating light, and a polarization splitting element arranged so that the angle formed by the optical axes of the light of the respective polarization components is less than 90 °, and a light receiving device that receives the light split into the two polarization components, respectively. Also has two light-receiving portion, a light receiving means for receiving surface of the light receiving portion is disposed toward substantially the same direction,
Composed of.

Alternatively, the optical head includes a light emitting element that emits light, an objective lens that collects the light emitted from the light emitting element onto a recording medium and receives reflected light from the recording medium, and the light emission. A reflection light separation element which is disposed between the element and the objective lens and separates from the optical axis of the light reaching the optical recording medium from the light emitting element by reflecting or transmitting the reflection light from the recording medium; The polarized light is divided into two light beams of two polarization directions orthogonal to each other by partially reflecting and transmitting the polarized light, and the polarized light is arranged so that the angle formed by the optical axes of the light beams of the respective polarization components is less than 90 °. A separating element and at least two light receiving portions for respectively receiving the lights separated into the two polarization components,
The light receiving section is formed on one substrate.

Further, in the optical head having the above structure, the reflected light separating element may be arranged on a divergent light path between the light emitting element and the objective lens.

Furthermore, in the optical head having the above structure, the polarization separating element may be a flat plate-shaped transparent member.

[0019]

The recording medium moving means rotates or translates the recording medium in the direction along the recording track.

In the optical head, the light emitted from the light emitting element is condensed on the recording medium by the objective lens, the reflected light from the recording medium is separated by the reflected light separating element, and the separated reflected light is polarized by the polarization separating element. The angle formed by the optical axis is 90 °
Further, the polarized light is further separated by polarization, and the light separated by the light receiving means is such that the light receiving surfaces of the two light receiving portions are oriented in substantially the same direction or the two light receiving portions are arranged on one substrate. Receive light. By separating the polarized light so that the angle formed by the optical axes is less than 90 °, the light receiving surfaces of the two light receiving portions are arranged in substantially the same direction, or
It is possible to use a light receiving means in which two light receiving portions are arranged on one substrate, which is suitable for downsizing and weight reduction, and an optical head which can be easily assembled and adjusted can be configured.

The optical head can be made smaller and lighter by disposing the reflected light separation element on the divergent light path between the light emitting element and the objective lens.

The optical head can be made smaller and lighter by using a flat plate-shaped transparent member as the polarization separation element. Further, since it is possible to impart astigmatism to the light by using a flat plate-shaped transparent member as the polarization separation element, it is not necessary to separately provide an optical element for obtaining the tracking error signal.

The optical head moving means moves the optical head in a direction perpendicular to the direction along the recording track of the recording medium.

[0024]

By providing an optical head that is compact and lightweight and easy to assemble and adjust, the magneto-optical information processing apparatus can be made low in cost and compact and lightweight.

Further, since the optical head is lightweight, the optical head can be moved at high speed, so that the access time and processing time can be shortened.

Further, since the optical head is a lightweight optical head, the optical head can be moved quickly enough even if the optical head moving means has a low output, so that the cost of the optical head moving means can be reduced, and the size and weight can be reduced. The magneto-optical information processing device can be reduced in cost and reduced in size and weight.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magneto-optical information processing apparatus of the present invention will be described below with reference to the drawings. In addition, the same reference numerals are given to the portions corresponding to the conventional technology, and the description thereof will be appropriately omitted.

FIG. 6 is a block diagram showing the configuration of an embodiment of the magneto-optical information processing apparatus of the present invention. The magneto-optical information processing apparatus of the present embodiment comprises a spindle motor 200 as a recording medium moving means, An optical head 400, a magnetic head 300 as a magnetic field generating means, and an optical head moving means (not shown) are included.

FIG. 7 is a perspective view of the optical head 400.
The optical head 400 includes a semiconductor laser 41 as a light emitting element.
And an objective lens 42 and a BS as a reflected light separation element arranged between the semiconductor laser 41 and the objective lens 42.
(Beam splitter) 43 and P as a polarization separation element
A light receiving means 500 in which a BS (polarizing beam splitter) 44, a light receiving portion 51 and a light receiving portion 52 are provided on a base 53
It consists of and. In this embodiment, the semiconductor laser 41 emits a P-polarized linearly polarized laser beam to the light splitting surface of the BS 43. BS43
Of the reflected light from the disk 1, the reflectance RS1 of the S polarization component is higher than the reflectance RP1 of the P polarization component. At this time, RP1 and RS1 are respectively set to RP1 = 10 to 30% and RS1 = about 100%. BS4
The reflected light from the disk 1 reflected at 3 is incident on the PBS 44 while being collected.

Of the reflected light from the disc 1, the PBS 44 transmits the P-polarized component with respect to the reflecting surface of the PBS 44 and guides it to the light receiving section 51, while the S-polarized component is reflected and guided to the light receiving section 52. . Therefore, the reflectance RP2 of the PBS 44 with respect to the P-polarized component is set to RP2≤10%, and the reflectance RS2 of the S-polarized component is set to about RS2≥90%. The reflection surface of the PBS 44 forms an angle of 90 between the optical axis of the transmitted P-polarized component light and the optical axis of the reflected S-polarized component light.
The angle of incidence is set to be 45 ° or more so that the angle is less than 45 °.
As shown in the figure, it is possible to arrange the light-receiving surfaces on one base 53 with their light-receiving surfaces oriented in substantially the same direction. Also, PBS4
4 detects the rotation of the polarization plane by the disc 1,
The polarization directions of the respective lights separated by the PBS 44 are inclined so as to have an angle of about 45 degrees with respect to the P-polarized light direction with respect to the light separation surface of the BS 43.

The PBS 44 also has a function of giving astigmatism to the light transmitted through the PBS 44.

FIG. 8 shows BS43, PB from the direction A in FIG.
S44 is a plan view of the light receiving unit 51, 52 when viewed,
The distance in the height direction viewed from the A direction is shortened to about the length of the diagonal line of the PBS 44.

FIG. 9 shows the PBS 44 and the light receiving portions 51 and 52.
And an enlarged view of the relationship between the light incident on these optical elements, and the light of the P-polarized component with respect to the reflecting surface of the PBS 44 that has passed through the PBS 44 is incident on the light receiving unit 51 before the converging point. It is designed to be done. PBS44
The light transmitted through has astigmatism. PBS44
The light of the S component reflected by is incident on the light receiving portion 52 behind the condensing point. These light receiving parts 5
1, 52 are provided on the same base 53, and an analyzer 54 is provided on the incident surface of the base 53. Analyzer 54
Is to improve the extinction ratio of light of each polarization component.

Next, the operation of this embodiment will be described.
The emitted light of the P-polarized component emitted from the semiconductor laser 41 is incident on the BS 43, but since the BS 43 has an increased transmittance of the P-polarized component, most of it is applied to the disc 1 via the objective lens 42. . The light radiated to the disc 1 has its polarization plane rotated according to the direction of magnetization of the disc 1 to become reflected light containing an S-polarized component, and the reflected light is reflected by the BS 43 after passing through the objective lens 42. It B
Since S43 has a high reflectance with respect to the S-polarized component, the light of the slight S-polarized component contained in the reflected light is predominantly reflected, and the P-polarized component is reflected relatively little.

Therefore, the ratio of the S-polarized component to the P-polarized component contained in the light reflected by the BS 43 is increased as compared with the ratio at the time of being reflected from the disc 1, and B
It is understood that S43 has an amplifying effect on the S-polarized component with respect to the P-polarized component.

The light reflected by the BS 43 is incident on the PBS 44. The PBS 44 forms an angle of 45 degrees with respect to the light of the P-polarized component with respect to the light separation surface of the BS 43.
The PBS 44 has a function of separating light into two polarization components, that is, a P polarization component and an S polarization component in the PBS 44.
Of the summation signal obtained by the light receiving unit 51 that receives the light of the P-polarized component that has passed through the reflection surface of the PBS 44 that has transmitted 44, and the summation signal that is obtained by the light-receiving unit 52 that receives the light of the S-polarized component that has reflected the PBS 44. If the difference is calculated by the differential amplifier 61, a modulated signal according to the magnetization direction of the disk 1 can be obtained.

FIG. 10 is a block diagram showing details of the light receiving units 51 and 52 and a generation circuit for generating a reproduction signal, a focus error signal, and a tracking error signal from the light incident on these light receiving units 51 and 52. It is a figure. Figure 1
As shown in 0, each of the light receiving portions 51 and 52 is divided into three light receiving regions 51a to 51c and 52a to 52c, respectively, and the direction of the dividing line is the direction of the track groove formed in the disk 1. It is parallel to. Each of the light receiving regions 51a to 51c and 52a to 52c photoelectrically converts the light incident on each of the light receiving regions and outputs an electric signal according to the amount of light. Light receiving area 51 in light receiving section 51
The output signals of a to 51c are supplied to the non-inverting input terminal of the differential amplifier 41, and the output signals of the light receiving regions 52a to 52c of the light receiving section 52 are supplied to the inverting input terminal of the differential amplifier 61. Light receiving unit 5 calculated by the amplifier 61
The difference between the sum total output of 1 and the sum total output of the light receiving unit 52 becomes the reproduction signal. In the light receiving section 51, the difference between the output of the light receiving area 51a and the output of the light receiving area 51b is calculated by the differential amplifier 62, and a tracking error signal using the so-called push-pull method is obtained from the differential amplifier 62. Of course, the push-pull error is caused by the light receiving areas 52a and 52c of the light receiving section 52.
You may make it detect from.

Further, the light receiving regions 51a and 51 of the light receiving portion 51 are
The sum signal with c is input to the non-inverting input terminal of the differential amplifier 63,
The output signal of the light receiving area 51b is supplied to the inverting input terminal of the differential amplifier 63, and the difference signal between the two is calculated by the differential amplifier 63, while the light receiving areas 52a and 52c of the light receiving section 52 are calculated.
And the difference signal between the light receiving area 51b
It is detected by the differential amplifier 64 in the same manner as in the above case.

The output of the differential amplifier 63 is supplied to the non-inverting input terminal of the differential amplifier 65, and the output of the differential amplifier 64 is supplied to the inverting input terminal of the differential amplifier 65.
5 calculates a difference between the two to generate a focus error signal by the so-called beam size method. This is because the light receiving unit 51 is arranged in front of the condensing point of the incident light and the light receiving unit 52 is arranged behind the condensing point of the incident light, so that when the focus state changes, both the light receiving units 51 and 52 are arranged. The fact that the diameter of the incident light changes complementarily is used, and the output of the differential amplifier 65 becomes 0 when the focus is achieved, and when the focus is deviated, the focus having the polarity according to the direction is obtained. Output an error signal.

If the incident angle of the S-polarized light component incident on the light receiving section 52 is large, the shape of the beam is distorted on the light receiving section 52 due to the influence of coma aberration, so that the focus error signal can be detected by the correct beam size method. There is a risk of disappearing. Therefore, it is desirable that the angle formed by the optical axis of the light of the S-polarized component and the normal line of the light receiving section 52 be less than about 50 °.

FIG. 11 is a diagram showing another embodiment of the light receiving portions 51 and 52. 11, parts corresponding to those in the circuit diagram shown in FIG. 10 are designated by the same reference numerals, and the description thereof will be omitted as appropriate. In FIG. 11, each light receiving unit 51, 52
Letting a, b, c, d, and e be the light receiving regions of S, and S, Tes, and Fes be the reproduction signal, the tracking error signal, and the focus error signal, respectively, S = (e)-(a + b + c + d) Tes = (a + b)- (C + d) Fes = (a + d)-(b + c).

In this way, the light receiving section 52 for receiving the reflected light of the PBS 44 does not need to be divided, the loss of the amount of received light due to the division gap is eliminated, and a larger reproduction signal level can be obtained. Further, the light receiving section 52 only needs to receive the reflected light from the PBS 44, which facilitates the adjustment.
FIG. 12 shows a light receiving section 51 for moving the disc focus.
Shows the shape change of the upper beam, (a) is too close,
(B) shows the case of being in focus, and (c) shows the case of being too far.

FIG. 13 is a diagram showing still another embodiment of the light receiving portions 51 and 52. In FIG. 13, the light receiving unit 51
Is divided into six light receiving regions 51a to 51f, and the light receiving portion 52 is divided into three light receiving regions 52a to 52c. However, unlike the case of FIG. 10, focusing on the light receiving portion 52, the direction of the dividing line is a direction orthogonal to the track groove direction. Then, the light receiving regions 51a to 51
a to f are photoelectric conversion outputs obtained from f, and the light receiving region 52
When the photoelectric conversion outputs obtained from a to 52c are g to i, the reproduction signal S = (a + b + c + d + e +
f)-(g + h + i) tracking error signal Tes = (a + b + c)-(d
+ E + f) Focus error signal Fes = {(a + d + c + f)
-(B + e)}-(g + i-h).

With this arrangement, when the beam on the disk 1 is made to follow the track by the action of the tracking servo, even if the beam on the light receiving portion moves in the left-right direction in FIG. Stable focus servo characteristics can be obtained without appearing in the signal.
In the above embodiments, the BS 43 is
A prism having a polarizing film on one surface can be used,
In general, the other surface of the BS 43 is often provided with an antireflection coating.

However, even if this non-reflective coating is not applied, by using the signal generating circuit shown in FIG. 10, it is possible to generate a correct read signal and servo error signal even when reflected on both sides of the BS 43. Is.

The angle θ1 between the PBS 44 and the incident light is
By increasing the distance, the distance between the light receiving section 51 and the light receiving section 52 can be lengthened, the interference between the light incident on the respective light receiving sections 51 and 52 can be prevented, or the light receiving section 5 can be prevented.
It is possible to improve the degree of freedom of arrangement of 1,52.

However, if θ1 is too large,
The beam shape is distorted due to the influence of coma on the light receiving unit 52. In this case, the base on which both the light receiving units 51 and 52 are mounted is inclined by an angle θ2, and
It is conceivable that the light should be projected to 52 as perpendicularly as possible. However, since the difference between the optical path length reaching the light receiving section 51 and the optical path length reaching the light receiving section 52 becomes small, it becomes difficult to generate the focus error signal by the beam size method.

Therefore, as shown in FIG.
A prism 55 having an index of refraction n and a thickness d as an optical path length adjusting element is arranged on the front surface of the above so that the substantial difference in optical path length becomes large. In the case of FIG. 14, the optical path length of the light incident on the light receiving section 51 (that is, the light of the P-polarized component) is Δl = (d / cos θ 2) − (1 / n) · (d / cos
θ2 ′) However, θ2 ′ = arcsin {(1 / n) · sin θ2)} is shortened. That is, an appropriate optical path length can be selected by appropriately selecting the refractive index n and the thickness d.

Further, other specific structures of the light receiving means are shown in FIGS. 15, 16, 17, 18, 19, and 20. (A) and (b) of each figure show the side view and perspective view of a light-receiving means, respectively.

The light receiving means 500 shown in FIG.
An inclined surface is formed on the base 53 on which the light receiving portions 51 and 52 are mounted so that the angle formed by the light receiving surfaces 1 and 52 is larger than 90 °.

The light receiving means 500 shown in FIG.
A base 5 on which the light receiving portions 51 and 52 are placed so that the focal points of the light separated by 4 and the positions of the light receiving portions 51 and 52 match.
A step is formed at 3.

The light receiving means 500 shown in FIG.
Light is condensed by providing a convex lens 58 on the light receiving surface of the base 53 on which the 1, 52 are mounted. Lens 5
8 is made of transparent resin.

The light receiving means 500 shown in FIG.
Light is condensed by providing a refracting member 59 for changing the incident angle of light on the light receiving surface of the base 53 on which the 1, 52 are mounted. 59 is made of transparent resin.

In the light receiving means shown in FIGS. 15, 16, 17, and 18, the distance between the light receiving portions 51 and 52 can be reduced,
The light receiving means can be miniaturized.

The light receiving means 500 shown in FIG. 19 is formed by forming the light receiving portions 51 and 52 from one semiconductor substrate.
FIGS. 7A, 7B and 7C respectively show the light receiving means 50.
0 is a top view, a front view, and a side view. The light receiving portions 51 and 52 are integrated into an IC on the semiconductor substrate 56. Further, a terminal 57 that is electrically connected to the light receiving portions 51 and 52 is provided.

Further, FIG. 20 shows a specific wiring pattern of the semiconductor substrate 56.

Next, another embodiment of the optical head 400 will be described. The optical head shown in FIG. 21 uses a flat plate-shaped beam splitter for the BS 43, and can be further reduced in size and weight. In the optical head shown in FIG. 22, an aberration correction plate 45 made of a flat plate-shaped transparent member for correcting the aberration generated by the BS 24 is provided between the semiconductor laser 41 and the BS 43 in the optical head shown in FIG. It is provided.

The optical head shown in FIG. 23 has a raising mirror 46 provided between the BS 43 and the objective lens 42. The optical head shown in FIG. 24 reflects the light from the semiconductor laser 41 by the BS 43 and guides it to the disc 1, and the reflected light from the disc 1 is transmitted by the BS 43.
The light receiving means 500 receives the reflected light from the disc 1 that has passed through the BS 43.

Although not shown in the drawing, a collimator lens may be provided between the semiconductor laser 41 and the objective lens 42, and the BS 43 may be arranged on the parallel optical path between the collimator lens and the objective lens 42. The PBS 44 is not limited to the flat plate shape, and the angle formed by the optical axis of the transmitted P-polarized component light and the optical axis of the reflected S-polarized component light is 90.
Any material may be used as long as it is less than °.

Further, a light receiving element for monitoring for detecting the intensity of the emitted light from the semiconductor laser 41 reflected by the BS 43 on the side opposite to the PBS 44 is arranged, and the output according to the intensity of the emitted light of the semiconductor laser 41 is detected. Then, the output of the semiconductor laser 41 is controlled so that the detected output becomes a predetermined output level, so-called APC (Auto
matic power control) Servo can also be formed.

FIG. 25 is an external view of an embodiment of the magneto-optical information processing apparatus of the present invention. Reference numeral 700 is a magneto-optical information processing apparatus main body. Inside the main body 700, a CPU 710 and an information recording / reproducing section 720 are provided. It is stored, and the main body 700 has a disc insertion slot 730, a speaker 740, and
An external device connection unit 750 for connecting an external information input / output device is provided. The external device connection section 750 includes
An image scanner 760 is connected, but besides this,
A sound collecting microphone 770 and a printer 780 can be connected. Reference numeral 790 is a keyboard, and 800 is a CRT display device.

FIG. 26 is a block diagram of the magneto-optical information processing apparatus shown in FIG. The information recording / reproducing unit 720 includes a spindle motor 200 for rotating the disc along a recording track, an optical head 400 for irradiating the disc with light, and a magnetic head 3 for applying a magnetic field to the disc.
00 and a linear motor 900 for moving the optical head in a direction perpendicular to the recording track of the disc (radial direction of the disc).

Since the optical head 400 used in the magneto-optical information processing apparatus of the present invention is small, another recording / reproducing system (for example, magnetic recording / reproducing system or non-rewritable optical recording / reproducing system) inside the main body 700 is used. The head can also be stored. As a result, information that may be corrected is recorded on the magneto-optical disk for the time being, and the information on the magneto-optical disk is organized and transferred to a non-rewritable optical disk when correction is no longer required. It can also be done in the device. It is also possible to record only important information on an unrewritable optical disk and record other information on a magneto-optical disk. These processes can be executed by input from the keyboard.

Further, since the optical head 400 is small and lightweight, it is possible to exert a further effect in a portable magneto-optical information processing device.

The recording medium is not limited to the disk type, but may be a card type having a large number of linear recording tracks. In this case, the recording medium moving means may be a means for reciprocating the recording medium along the recording track instead of the spindle motor.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an example of a conventional optical head device.

FIG. 2 is a plan view of the optical head device of FIG. 1 viewed from the direction A.

FIG. 3 is a block diagram showing a main part configuration of another example of a conventional optical head device.

FIG. 4 is a block diagram showing a main part configuration of still another example of a conventional optical head device.

FIG. 5 is a perspective view showing an example of a Wollaston prism.

FIG. 6 is a block diagram showing the configuration of an embodiment of an optical head device in the magneto-optical information processing device of the present invention.

FIG. 7 is a perspective view showing a configuration of a main part of an embodiment of an optical head device in the magneto-optical information processing device of the present invention.

FIG. 8 is a plan view of the optical head device of FIG. 6 viewed from the direction A.

9 is a side view showing an embodiment of the PBS 44 and the light receiving means 500 of FIG.

FIG. 10 is a block diagram showing an embodiment of light receiving units 51 and 52 and peripheral circuits thereof.

FIG. 11 is a block diagram showing another embodiment of the light receiving units 51 and 52 and peripheral circuits thereof.

FIG. 12 is a plan view showing an example of a change in beam shape on the light receiving section of the embodiment of FIG.

FIG. 13 is a block diagram showing another embodiment of the light receiving units 51 and 52.

FIG. 14 is a side view and a perspective view showing another embodiment of the light receiving means 500.

FIG. 15 is a side view and a perspective view showing another embodiment of the light receiving means 500.

16 is a side view and a perspective view showing another embodiment of the light receiving means 500. FIG.

17 is a side view and a perspective view showing another embodiment of the light receiving means 500. FIG.

FIG. 18 is a side view and a perspective view showing another embodiment of the light receiving means 500.

FIG. 19 is a plan view showing another embodiment of the light receiving means 500,
It is a front view and a side view.

20 is a plan view showing the configuration of a wiring pattern of the light receiving means of FIG.

FIG. 21 is a perspective view showing a main part configuration of another embodiment of the optical head device in the magneto-optical information processing device of the present invention.

FIG. 22 is a perspective view showing a main part configuration of another embodiment of the optical head device in the magneto-optical information processing device of the present invention.

FIG. 23 is a side view showing the configuration of the main part of another embodiment of the optical head device in the magneto-optical information processing device of the present invention.

FIG. 24 is a side view showing the configuration of the main part of another embodiment of the optical head device in the magneto-optical information processing device of the present invention.

FIG. 25 is an external view showing the configuration of an embodiment of the magneto-optical information processing apparatus of the present invention.

FIG. 26 is a block diagram showing the configuration of the magneto-optical information processing apparatus in FIG.

[Explanation of symbols]

 1 disk (magneto-optical recording medium) 200 spindle motor 300 magnetic head 100,400 optical head 900 linear motor 11,41 semiconductor laser 12,42 objective lens 13,43 BS (reflected light separation element) 14,44 PBS (polarization separation) Element) 15 Collimator lens 16 Grating 17 λ / 2 plate 18 Condensing lens 19 Cylindrical lens 20 Concave lens 23 Wollaston prism 45 Aberration correction plate 46 Erecting mirror 500 Light receiving means 21, 22, 51, 52 Light receiving portion 53 Base 54 Inspection Photon 55 Prism 56 Semiconductor substrate 57 Terminal 700 Magneto-optical information processing device main body 710 CPU 720 Information recording / reproducing section 730 Disc insertion slot 740 Speaker 750 External device connection section 760 Image scanner 770 Sound collecting microphone 780 Printer 790 keyboard 800 CRT display device

Claims (13)

[Claims] 1. A light emitting element that emits light, an objective lens that collects light emitted from the light emitting element onto a recording medium and receives reflected light from the recording medium, the light emitting element and the objective lens. And a reflected light separating element arranged between the light emitting element and the optical recording medium to separate or separate the reflected light from the recording medium by reflecting or transmitting the reflected light from the recording medium. A polarization separating element arranged so that the light of two polarization directions orthogonal to each other is partially reflected and partially transmitted, and the angle formed by the optical axes of the lights of the respective polarization components is less than 90 °;
An optical head device comprising: a light receiving unit having at least two light receiving units for respectively receiving the lights separated into the two polarized light components, and light receiving surfaces of the light receiving units arranged in substantially the same direction. A recording medium moving means for rotating or translating the recording medium, and an optical head moving means for moving the optical head with respect to the recording medium, and based on an output signal output from the light receiving means of the optical head. A magneto-optical information processing device for reading information recorded on the recording medium. 2. A light emitting element that emits light, an objective lens that collects the light emitted from the light emitting element onto a recording medium and receives reflected light from the recording medium, the light emitting element and the objective lens. And a reflected light separating element arranged between the light emitting element and the optical recording medium to separate or separate the reflected light from the recording medium by reflecting or transmitting the reflected light from the recording medium. A polarization separating element arranged so that the light of two polarization directions orthogonal to each other is partially reflected and partially transmitted, and the angle formed by the optical axes of the lights of the respective polarization components is less than 90 °;
An optical head device, comprising: at least two light receiving portions, each of which receives the light separated into the two polarized light components, the light receiving portion being arranged on one substrate.
A recording medium moving means for rotating or translating the recording medium, and an optical head moving means for moving the optical head with respect to the recording medium, and based on an output signal output from the light receiving means of the optical head. A magneto-optical information processing device for reading information recorded on the recording medium. 3. The light emitting element emits divergent light, and the reflected light separation element is arranged on a divergent light path between the light emitting element and the objective lens. The magneto-optical information processing device described in 1. 4. The magneto-optical information processing apparatus according to claim 1, wherein the polarization separation element is a flat plate-shaped transparent member. 5. A recording medium is further provided with a magnetic field generating unit arranged at a position facing the optical head device with the recording medium interposed therebetween, and the recording is performed by irradiating the recording medium with light by the optical head device. The magneto-optical information processing apparatus according to claim 1, 2, 3 or 4, wherein information is recorded on the recording medium by heating the medium and applying a magnetic field to the heated portion of the recording medium by the magnetic field generating means. 6. An audio signal converting means for converting the information read from the recording medium into an audio signal, and an audio output means for outputting an audio based on the audio signal converted by the audio signal converting means. The magneto-optical information processing apparatus according to claim 1, 2, 3, or 4, characterized in that it is provided. 7. A voice input device for inputting voice, and a voice signal converting device for converting the input voice into a voice signal, wherein the recording medium is recorded on the recording medium based on the voice signal from the voice signal converting device. 6. The voice information is recorded, and the information is recorded.
The magneto-optical information processing device described in 1. 8. An image signal conversion means for converting the information read from the recording medium into an image signal, and an image display means for displaying an image based on the image signal converted by the image signal conversion means. The magneto-optical information processing apparatus according to claim 1, 2, 3, or 4, characterized in that it is provided. 9. An image input unit for inputting an image, and an image signal conversion unit for converting the input image into an image signal, wherein the recording medium is recorded on the recording medium based on the image signal from the image signal conversion unit. The image information is recorded, and the image information is recorded.
The magneto-optical information processing device described in 1. 10. The magneto-optical device according to claim 1, further comprising a print output unit for converting the information read from the recording medium into characters / symbols and printing them out. Information processing equipment. 11. A character / character for inputting a character / symbol.
A symbol input means and a character / character for outputting a character / symbol signal corresponding to the character / symbol input to the character / symbol input means
6. The magneto-optical information processing according to claim 5, further comprising: a symbol signal output means, wherein character / symbol information is recorded on the recording medium based on the character / symbol signal from the character / symbol signal output means. apparatus. 12. The recording medium further includes a sound, an image,
The magneto-optical device according to claim 1, 2, 3 or 4, further comprising an external information input device connecting means for connecting an external information input device for inputting information such as characters and symbols. Information processing equipment. 13. An external information output device connecting means is provided so that an external information output device for outputting information read from the recording medium as information such as voice, image, characters / symbols, etc. can be connected. The magneto-optical information processing apparatus according to claim 5, wherein