JPH08147741A - Composite optical head and optical recording and reproducing device - Google Patents

Abstract

PURPOSE: To enable the integration of a light emitting and a light receiving elements with a slider and to transfer a power source and a signal from the light emitting and the light receiving elements by integrating an optical head and a slider, their supporting means and a wiring means. CONSTITUTION: This optical head 1 is provided with a substrate 10A having a light emitting element 11 and light receiving elements 141a-d, 142a-d, and an optical member 20 having a light collecting part 21, an optical path compensating part 25 and a reflection film 22. A focusing coil part composed of driving coils 61a, 61b and a bobbin 63, etc., magnets 53a, 53b, a floating slider, an optical head supporting part 40 of a supporting means and a flexible printed wiring member (EPC) 70 of a wiring means are integrated together. Consequently, since the parts composing the optical head are integrated, the optical head is made small in size, light in weight and formed integrally, the device is made inexpensive, working and assembling accuracies are improved and high density recording is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head for optically recording / reproducing information on / from an optical recording medium and an optical recording / reproducing apparatus using the same, and more particularly to a state of being floated near the surface of the optical recording medium. The present invention relates to an optical head composite and an optical recording / reproducing device for recording and reproducing information.

[0002]

2. Description of the Related Art Conventionally, as a recording / reproducing apparatus for information, a magnetic recording / reproducing apparatus for magnetically recording / reproducing information on / from a magnetic recording medium by a magnetic head has been known, and a magnetic disk drive apparatus is a typical apparatus. Met. As another type of recording / reproducing apparatus, an optical recording / reproducing apparatus that optically records or reproduces information with a laser beam is known, and a read-only compact disc drive (CD-ROM) is used depending on a recording / reproducing method or the like. ROM), a writable magneto-optical disk drive device that uses both an optical method and a magnetic method, a phase change optical disk drive device, and the like.

On the other hand, in an information recording / reproducing apparatus as an external recording apparatus of a computer, the recording density per apparatus volume (hereinafter referred to as "apparatus recording density") is improved and the access speed required for recording / reproducing information is increased. Has been a major issue from the past. In addition, the unit cost per storage capacity required (hereinafter referred to as "bit cost") is decreasing year by year, and it has been an important subject to provide a cheaper information recording / reproducing device.

In the conventional magnetic recording / reproducing apparatus, a small magnetic head floats above the surface of the magnetic recording medium with a substantially constant gap, and recording / reproducing is performed while moving only the magnetic head and its supporting member. In contrast to this, the recording / reproducing apparatus has a drawback that an object lens, a focus control means, a tracking control means, and the like having a relatively large weight have to be moved, and an access speed to an information recording position is slow.

Further, although the areal recording density of the optical recording medium is still superior to that of the magnetic recording / reproducing at present, the magnetic recording / reproducing apparatus has a minute magnetic head and the magnetic recording medium is incorporated in the apparatus. Some have a structure in which a plurality of sheets are stacked, and some have a recording density higher than that of the optical recording / reproducing apparatus. Further, in the magnetic recording / reproducing apparatus, at present, a small magnetic recording medium having a diameter of about 1.8 inches (about 4.6 cm) has been put into practical use, and the thickness of the apparatus is as small as about 10 mm. The progress has been made. As a result, the magnetic recording / reproducing apparatus becomes a portable personal computer such as a notebook type computer (hereinafter referred to as “personal computer”).
Say. ) Is widely used as an external recording device such as a hard disk drive.

On the other hand, in the optical recording / reproducing apparatus, it is necessary to guide the light from the semiconductor laser, narrow it down onto the recording surface of the optical recording medium, irradiate it, and guide the reflected reproduction light to a detection sensor or the like.
Since many optical components are required, it has been difficult to miniaturize them. Further, since the number of optical components is large, there is a problem that the device price becomes higher than that of the magnetic recording / reproducing device having a simple structure. As a result, the magnetic recording / reproducing device is more widely used as the external recording device for the computer, and the optical recording / reproducing device is limited to the storage of the document file except the application such as the CD-ROM. It was the current situation that it was only used for the intended purpose.

In order to overcome such a situation, as an optical information recording / reproducing apparatus, it is necessary to increase the access speed to the information recording position, improve the recording density of the apparatus, and reduce the bit cost.

Generally, the following methods can be considered as a method for increasing the recording density of an optical recording / reproducing apparatus.

The numerical aperture (NA) of the objective lens is increased. Shorten the wavelength of the semiconductor laser.

A semiconductor laser, a sensor, and an optical component are integrated. Increase the number of recording media to make a stack structure.

Further, as a method for increasing the access speed to the information recording position, the following methods can be considered.

The mass of the optical head is reduced. Increase the thrust of the actuator that moves the optical head.

However, if the thrust of the actuator is increased, the size of the device also increases, so the device recording density does not improve. Therefore, it is desirable to reduce the size of the optical head, shorten the wavelength of the semiconductor laser, and increase the numerical aperture of the objective lens.

By the way, a semiconductor laser having a wavelength of 780 nm (nanometer) has been conventionally used, and a short wavelength semiconductor laser having a wavelength of about 680 nm is now practically available. However, in the conventional configuration,
In order to avoid contact between the objective lens and the optical recording medium, it is necessary to keep a working distance of about 1.5 mm to 2 mm between them. For this reason, even if the numerical aperture (NA) of the objective lens is increased, the focal length cannot be reduced, and the diameter of the required light beam is increased in proportion to the numerical aperture. However, the recording density of the device could not be increased.

In order to solve this problem, there is a floating optical head, such as a magnetic head used in a magnetic recording / reproducing apparatus, in which an optical head is levitated on an optical recording medium by using a flying slider. Proposed.

Here, a conventional floating optical head will be described with reference to FIG. The flying optical head 200 has a flying slider body 30, and a flying mirror 32 and an objective lens 31 are mounted on the flying slider body 30.
It is supported by being pressed against the optical recording medium 110 by the slider supporting member 80. The light emitted from the light emitting element 11 such as a laser diode is guided to the polarization mirror 32 through the condensing lens 46, the beam splitter 35, the polarizing plate 44 and the polarization element 33, reflected by the polarization mirror 32, and is reflected by the objective lens 31. It is condensed on the recording medium 110.
The reflected light from the optical recording medium 110 reaches the beam splitter 35 via the objective lens 31, the polarizing mirror 32, the polarizing element 33, and the polarizing plate 44, is reflected by the beam splitter 35, and is condensed by the condensing lens 38 and the cylindrical lens 39.
The signal reaches the light receiving element 13 through the through and the signal is detected. A drive member 37 is attached to the condenser lens 46, whereby the condenser lens 46 is driven substantially in the direction of its optical axis, and is controlled so as to be focused on the surface of the optical recording medium 110. The light spot formed on the optical recording medium 110 is minutely moved by a minute tracking driving member (not shown) mounted on the polarization element 33 and positioned on the data track.

[0017]

Since the conventional levitation type optical head 200 is constructed as described above, only the polarizing mirror 32 and the objective lens 31 are levitation slider main body 3
It will be mounted on 0, and the light emitting element 11 and the light receiving element 1
3. Since the optical components such as the beam splitter 35 are separated from the flying slider body 30, these optical components should be made too small from the viewpoint of ease of assembly and adjustment. Although it is hoped that the access speed to the information recording position will be improved as compared with the conventional optical head, the device cannot be downsized to the same extent as the magnetic recording / reproducing device, and the recording density of the device can be reduced. There was a problem that it could not be improved.

In the optical head, aberrations caused by surface accuracy, dimensional accuracy, assembly accuracy, etc. of optical parts,
There are aberrations such as the aberration of the light emitting element itself and the aberration generated by the wavelength variation of the light emitting element due to the temperature change. Unless this aberration is suppressed as small as possible, the light cannot be focused on a minute spot. Therefore, each optical component is required to have high accuracy, which has a problem that it is an obstacle to reducing the bit cost.

On the other hand, there were other problems in improving the recording density of the device. It is a focus drive means,
And the configuration of the tracking drive means.

In general, the position of the light spot focused by the optical head varies depending on the dimensional accuracy and assembly accuracy of the optical parts. Further, since the optical recording medium 110 vibrates up and down due to the rotation, a focus driving means is required to always focus on the recording surface.

A flying type optical head 20 using a flying slider.
In the case of 0, the flying slider acts as the focus driving means, but the positional deviation of the light spot due to the processing accuracy, the assembly accuracy, etc. still remains. Further, since the flying height of the flying slider changes depending on the linear velocity of the optical recording medium, the YAW angle (air inflow angle), etc., the position of the light spot shifts. For this reason, it is difficult to realize a floating optical head that has no focus driving means. In the conventional example, the polarizing mirror 32 and the objective lens 31 are fixed to the flying slider body 30, and when the flying amount of the flying slider body 30 changes, the distance between the objective lens 31 and the optical recording medium 110 changes. Then, the position of the light spot will be displaced. Therefore, in the conventional example, focus control is performed by driving the condenser lens 46 in the optical axis direction by the driving member 37.

As described above, the optical recording / reproducing apparatus requires the focus driving means, and the apparatus inevitably becomes large, so that the recording density of the apparatus cannot be improved. For these reasons, it is difficult to miniaturize the optical recording / reproducing device, and it has not been possible to mount the optical recording / reproducing device on a small personal computer such as a notebook personal computer.

In order to solve the above problems in the conventional floating type optical head 200, the flying slider is supported by a slider supporting member 80 to fly, and the light emitting element, the light receiving element, the condenser lens and other optical parts are also floated. It is possible to integrate and mount it inside to achieve miniaturization, but since the light emitting element and the light receiving element are so-called electronic parts,
There is a problem that a power supply means is required and a means for guiding the signal from the light receiving element to the signal processing means is required. Another problem is that the light spot is always focused on the recording surface of the optical recording medium 110 and positioned on the data track, so that the light from the optical recording medium 110 is guided to the light receiving element and the focus error signal and the tracking error. There is a problem that the optical head has to be configured to detect a signal, which hinders further miniaturization of the optical head.

Therefore, a first object of the present invention is to integrate a light emitting element, a light receiving element and an optical component on a flying slider,
An object of the present invention is to provide an optical head composite capable of supplying power to a light emitting element and a light receiving element and leading a signal from the light receiving element to a signal processing means.

A second object of the present invention is to perform focus control and tracking control, and to supply power to the light emitting element and the light receiving element without affecting each control.
Another object of the present invention is to provide an optical head composite body capable of deriving a signal from the light receiving element to the signal processing means.

A third object of the present invention is to provide a compact optical recording / reproducing apparatus which can be mounted on a portable compact personal computer such as a notebook personal computer by using the compact optical head complex having a high recording density. The purpose is to provide.

[0027]

In order to solve the above problems, an optical head composite according to a first invention of the present invention collects light from a substrate having a light emitting element and a light receiving element and the light emitting element. A gap is formed between an optical head having an optical member that irradiates the optical recording medium and guides the light reflected from the optical recording medium to the light receiving element, and the optical recording medium by rotation of the optical recording medium. A slider configured to float while being held, supporting means for supporting the optical head on the slider, power supply to the light emitting element and the light receiving element, and a signal from the light receiving element to a signal processing means. The wiring means to be led out is integrated.

An optical head composite according to a second aspect of the present invention is a substrate having a light emitting element and a light receiving element, and collects light from the light emitting element to irradiate it onto an optical recording medium and to An optical head having an optical member that guides light reflected from a recording medium to the light receiving element, focus control means for moving the optical head in a focal direction which is a direction in which the optical head comes in and out of the optical recording medium, and the optical recording medium. A slider configured to fly while maintaining a gap between the optical recording medium and the optical recording medium, support means for supporting the optical head on the slider so as to be movable in the focal direction, the light emitting element, and Wiring means for supplying power to the light receiving element and deriving a signal from the light receiving element to the signal processing means,
It is configured by integrating.

An optical recording / reproducing apparatus according to a third aspect of the present invention is an optical head composite according to any one of claims 1 to 11, which records and reproduces information on a rotating optical recording medium. An arm member for movably supporting the optical head composite in a direction traversing a data track of the optical recording medium, and an optical spot irradiated from the optical head composite by moving the arm member. And a tracking means for tracking on the data track.

[0030]

According to the first aspect of the present invention having the above structure, the optical head, the slider, the supporting means, and the wiring means are integrated, so that the parts required for the optical head can be integrated. It becomes easy to increase the density.

According to the second aspect of the present invention having the above structure, the optical head, the focus control means, the slider, the support means and the wiring means are integrated, so that the focus control is not affected. Power can be supplied to the light emitting element and the light receiving element.

Further, according to the third invention of the present invention having the above-mentioned structure, in the optical recording / reproducing apparatus, the optical head composite according to the first invention or the second invention is used as a recording / reproducing head portion. Can be used.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 are perspective views showing the overall structure of an optical head composite body according to a first embodiment of the present invention. The configuration of each part will be described below with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of an optical head composite body 101 which is a first embodiment of the present invention.

The arm 8 is movably supported in a data track orthogonal direction 15 which crosses a data track of an optical recording medium (not shown). A slider support member 80 is attached to the tip of the arm 8, and the slider support member 8
A flying slider 3 is attached to the tip of 0.

A flexible printed circuit (Flexible Printed Circuit member; hereinafter abbreviated as "FPC") 70, which is a wiring means fixed to the upper surface of the arm 8 by a resin or the like, further supports a slider. It extends toward the tip of the member 80. FPC70
Is configured to have a circuit portion 72 in which wiring or the like is printed on a flexible plastic film or the like. This FP
In the C70, a fixed portion 73 is formed substantially in the center above the substrate 10A, and a fine branch-shaped displacement portion 71 is formed between the fixed portion 73 and the circuit portion 72. The fixed portion 73 is made of resin or the like on the substrate 10A. It is fixed by (see Fig. 4). A wiring terminal portion 74 is provided at the tip of the circuit portion 72.

As described above, since the branch-shaped displacement portion 71 is formed around the fixed portion 73 and only the fixed portion 73 is integrated with the substrate 10A, there is an advantage that the entire optical head can be downsized. . Further, since the displacement portion 71 is formed in a thin branch shape, it has a low rigidity in the bending direction and is elastically connected to the fixed portion 73, so that the focus direction 16 is a direction in which the optical head is brought into and out of contact with the optical recording medium during focus control. Since it easily follows even if it is moved to, it is possible to reduce the influence on the focus control.

The slider support member 80 includes a wide portion 81,
The bent portion 83, the pressing spring portion 84, the fixing portion 85, and the thin branch-shaped gimbal portion 82 are included. Gimbal part 8
2 is connected to an optical head support portion 40 (see FIG. 3) described later by a thin branch-shaped member 41. The fixed portion 85 is fixed to the arm 8 by caulking or the like. The pressing spring portion 84 presses the tip portion of the slider support member 80 toward the optical recording medium 110 (see FIG. 4).

FIG. 2 shows the connecting portion between the FPC and the substrate in the optical head composite body according to the first embodiment of the present invention.
FIG. 3 is a perspective view seen from the back surface of FIG. A light emitting element 11, a rising mirror 12, and a light receiving element 13 are provided on the substrate 10A. The board power supply terminal and the board signal terminal 76 formed on the board 10A are connected to the wiring terminal portion 74 of the FPC 70 by a gold wire 77 as a connecting means. In this way, FPC
By integrating the wiring terminal portion 70 of the board 70 and the board power supply terminal and board signal terminal 76 of the board 10A, the overall size of the optical head can be reduced. In addition, since the gold wire 77 is a thin wire, it has flexibility and can be minutely displaced in the focus drive direction and the tracking drive direction. Therefore, the gold wire 77 easily follows during focus servo or tracking servo, and adversely affects each servo. Light-emitting element 1 without giving
1 and the light receiving element 13 and the light receiving element 13
The signal from can be taken out.

FIG. 3 is a perspective view showing components of the optical head composite body according to the first embodiment of the present invention. In the figure, the optical head composite body 101 is constructed by disposing the flying slider 3 having an annular shape on the lower surface of the slider supporting member 80. In the flying slider 3, a through-hole 34 is provided substantially at the center of a flying slider body 30 formed in a thin column shape, and a beam splitter 35, a convex portion 36, and an air bearing surface 47 are provided.
Is configured.

A focus coil portion 60 is provided at an upper end portion of the slider supporting member 80 in the optical head composite 101, and the focus coil portion 60 includes a ring-shaped yoke 64 made of a magnetic material and a resin or the like. A bobbin 63 made of the above material and a pair of drive coils 61a and 61b wound around the bobbin 63 are provided.

In the optical head composite 101, the optical head 1 is arranged at the end of the upper surface of the slider support member 80 with the focus coil portion 60 interposed therebetween. The optical head 1 is assembled so as to be inserted into the central opening of the focus coil section 60 (see FIG. 4). The optical head 1 includes a light emitting element 11 and a light receiving element 13 (see FIG. 4).
And a substrate 10A on which is arranged, and an optical member 20 having a condensing portion 21 (see FIG. 4) and the like.

An optical head support portion 40 is formed at the tip of the slider support member 80, and the optical head support portion 40 is formed.
Are formed by etching the same member as the gimbal portion 82. A circular opening 42 is provided at the center of the optical head support portion 40. Then, the convex portion 36 formed on the flying slider body 30 is fixed to the lower portion of the gimbal portion 82 (see FIG. 4). Further, the lower part of the optical head 1 is inserted into the opening 42 of the optical head supporting portion 40 and supported by the optical head supporting portion 40 (see FIG. 4). This allows
The optical head 1 is elastically supported by the flying slider body 30 so as to be movable in the focus direction 16. Magnets 53a and 53b are fixed to the upper portion of the gimbal portion 82 so as to face the drive coils 61a and 61b (see FIG. 4). The slider support member 80 is fixed by caulking the caulking portion 86 formed on the fixing portion 85 into the fixing hole 91 at the tip of the arm 90. In the above, the optical head support 4
0, the branch member 41, and the convex portion 36 form a support means.

FIG. 4 is a sectional view showing the structure of the optical head composite body according to the first embodiment of the present invention. The optical head 1
A substrate 10A made of silicon (Si) or the like and an optical member 20 formed of an optically transparent member such as glass or plastic and having a substantially axially symmetrical shape are provided.
The optical member 20 is integrally molded by a mold or the like.

A raising mirror 12 is attached to the substrate 10A, and a light emitting element 11 such as a semiconductor laser is joined thereto. The laser light L emitted from the light emitting element 11 is reflected by the slope 17 of the rising mirror 12 and is deflected in a direction substantially perpendicular to the plane of the substrate 10A.

Further, on the surface of the substrate 10A on which the raising mirror 12 is attached, light receiving elements 141a, 141b, 141 formed by a semiconductor manufacturing process.
c, 141d, 142a, 142b, 142c, 142
d are provided respectively. In addition, the light receiving element 141a
.About.141d and 142a to 142d are four-divided elements which are arranged so as to be substantially orthogonal to the data track direction 14 and are arranged in parallel substantially in the data track direction 14 (see FIG. 6). Then, the light receiving elements 141a to 141
The raising mirror 12 is adhered on the d and 142a to 142d.

The optical member 20 is provided with a concave portion 28 which is concave like a concave lens, and a convex lens-like condensing portion 21.
The light emitting element 11 and the rising mirror 12 are housed in the recess 28. A reflective film 22 is coated on the surface of the light collecting unit 21. Further, an incident portion 23 on which the laser light L emitted from the light emitting element 11 and reflected by the rising mirror 12 is incident is provided in a substantially central portion of the light condensing portion 21,
The reflection film 22 is not coated on this portion.

An optical path correction section 25 and a light transmission window 26 are provided on the surface of the optical member 20 opposite to the side on which the condenser section 21 is formed (see FIG. 5). The optical path correction unit 25 reflects the laser light L incident from the light emitting element 11 through the rising mirror 12 and from the incident unit 23 so that the laser light L is once returned to the light condensing unit 21 side. The reflected light L is reflected by the back surface of the reflection film 22, and then passes through a light transmission window 26 provided at substantially the center of the optical path correction unit 25 (see FIG. 5) and irradiates the optical recording medium 110. On the other hand, the reflected light which is reflected by the optical recording medium 110 and returns, follows the path opposite to the above, enters the light collecting portion 21 through the light transmission window 26, and is once reflected in the opposite direction by the reflecting film 22. The light path correction unit 25 makes the light incident on the upper incident unit 23 and is guided to the rising mirror 12, and then the light receiving element 14
It is incident on 1a to 141d and 142a to 142d. As shown in FIG. 4, the optical head 1 is formed by joining the substrate 10A and the support portion 27 of the optical member 20.

The flying slider body 30 is made of glass, a magnetic material such as ferrite, or a ceramic material, and is formed by die molding. 53a,
53b is adhered and fixed to the gimbal portion 82 fixed on the convex portion 36 of the flying slider body 30, and the drive coil 6
The magnets are opposed to each other so as to surround 1a and 61b.
A ring-shaped yoke 64 made of a magnetic material, a bobbin 63 made of resin or the like, and a bobbin 63 wound around the bobbin 63 so as to face the magnets 53a, 53b on the outer periphery of the optical member 20. The arranged drive coil 61a,
61b is attached. Here, the focus coil unit 60 and the magnets 53a and 53b constitute a focus control means.

With this structure, the flying slider body 30 floats while following the surface wobbling of the rotating optical recording medium 110, and the optical head 1 has the flying slider body 30 and the optical head support portion. 40 makes it possible to keep the distance from the optical recording medium 110 constant to some extent. Therefore, the amount of movement of the optical head 1 required for the focus control is small and the driving force required for the focus control may be small, so that the focus coil unit 60 and the magnets 53a, 53b can be downsized.

The shapes of the optical path correction portion 25 and the light transmission window 26 when the optical head 1 is viewed from below are shown in FIG. The first of the above
In the case of the embodiment, the optical path correction unit 25 is formed by combining two types of reflection hologram patterns. The reflective hologram pattern is formed at the same time when the optical member 20 is integrally molded. The reflective film 22 is coated on the surface of the reflective hologram pattern except the light transmission window 26.

More specifically, the hologram pattern for reflecting the incident light L from the incident part 23 to the reflection film 22 of the condensing part 21 is substantially concentric and its cross-sectional shape is uneven.
Alternatively, it has a saw-tooth shape, and the pitch is smaller on the outer peripheral side (see FIG. 4). Then, the light transmission window 26
Is smaller than the size (diameter) of the optical path correction unit 25.

The flying slider body 30 is used for the optical recording medium 11.
When 0 rotates, it floats with a slight gap maintained between it and the air bearing surface 47. Therefore,
The air between the flying slider body 30 and the optical recording medium 110 constitutes an air bearing. The optical recording medium 110 is composed of a substrate 111 made of plastic or the like, a recording film 112 formed on the surface of the substrate 111 by sputtering or the like, and a protective film 113 coated on the recording film 112. Further, a groove of a data track is formed on the surface of the substrate 111.

In the optical head 1, a part of the optical head 1 is elastically supported by the optical head support portion 40 so that the surface provided with the light transmission window 26 faces the recording film 112 of the optical recording medium 110. . The optical head support portion 40 on which the optical member 20 of the optical head 1 is mounted and the branch member 41 connecting the flying slider body 30 and the gimbal portion 82 fixed by the magnets 53a and 53b constitute a leaf spring. The distance between the surface provided with the light transmission window 26 and the optical recording medium 110 is set to be larger than the flying height of the flying slider body 30.

The floating optical head 2 constructed as described above.
00 will be described. First, a process until the laser light L emitted from the light emitting element 11 is condensed on the optical recording medium 110, that is, a forward path will be described.

The laser beam L emitted from the light emitting element 11 such as a semiconductor laser is reflected by the slope 17 of the raising mirror 12 on the substrate 1.
It is deflected in a direction almost perpendicular to the plane of 0A. The deflected light passes through the incident portion 23, is reflected by the reflection hologram pattern of the optical path correction portion 25, and is guided to the light condensing portion 21. The back surface of the reflection film 22 of the condensing unit 21 is configured as a spherical concave mirror, and the condensing unit 21 condenses the laser light L reflected by the optical path correcting unit 25 toward the optical recording medium 110. The radius of curvature of the spherical surface is set so as to act as.

Laser light L condensed by the condenser 21
Is emitted from the light transmission window 26, passes through the air layer having only a preset gap, and passes through the protective film 11 of the optical recording medium 110.
3 to reach the recording film 112.

Here, the optical path correction unit 25 causes the light collecting unit 2 to
The reason why the light L is reflected by using the reflective hologram pattern when the laser light L is guided to the laser 1 will be described below.

In general, when the light L is condensed by the spherical concave lens, spherical aberration occurs, and the spherical aberration becomes larger on the outer peripheral side of the spherical surface. When spherical aberration occurs, the light L cannot be focused on a minute spot, and high recording density cannot be achieved. Therefore, the reflection type hologram pattern is used to correct the spherical aberration by utilizing the diffraction of the light L to prevent the spherical aberration from occurring.

As a result, the laser light L condensed by the condensing unit 21 without the occurrence of spherical aberration is transmitted through the light transmission window 2
It is irradiated onto the optical recording medium 110 through 6.

Next, the laser beam L focused on the optical recording medium 110 receives the light receiving elements 141a to 141d and the light receiving element 142.
The process of reaching a to 142d, that is, the return path will be described.

The light L condensed on the recording film 112 is reflected in a state corresponding to the recorded information, reaches the condensing unit 21 through the light transmission window 26, and follows the optical path opposite to the outward path to the optical path. The correction unit 25 is reached. A reflection hologram pattern is formed in the optical path correction unit 25 so as to focus the light on the rising mirror 12, and the diffracted light L from the optical path correction unit 25 is
As shown in FIG. 6, the light receiving elements 141a to 141d are transmitted through the slope 17 and the lower surface 18 of the rising mirror 12.
To reach. The light reflected by the raising mirror lower surface 18 is reflected by the raising mirror upper surface 19 which is parallel to the raising mirror lower surface 18, is transmitted again by the raising mirror lower surface 18, and is received by the light receiving element 14.
2a to 142d are reached. Here, the rising mirror slope 17 constitutes a half mirror slope.

Next, the focus control of the first embodiment will be described with reference to FIGS. 7 (a) to 7 (c).

7 (a) to 7 (c), the light receiving element 141a is divided into four substantially parallel to the data track direction 14.
.About.141d and the light receiving spots 151 and 152 condensed on the light receiving elements 142a to 142d.

FIG. 7A shows a state in which the irradiation spot on the optical recording medium 110 is focused on the data track of the recording film 112, and the sum of the light receiving amounts of the light receiving elements 141a to 141d is the light receiving element 142a. It is equal to the sum of the amount of received light of -142d.

FIG. 7B shows a case where the irradiation spot is defocused (irradiated in a state where the focus is deviated) above the recording film 112 of the optical recording medium 110, and the light receiving elements 141a to 141d receive light. The sum of the amounts is the light receiving element 142a.
It is smaller than the sum of the amount of received light of ~ 142d.

In FIG. 7C, the irradiation spot is shown in FIG. 7B.
In the opposite direction, that is, the recording film 112 of the optical recording medium 110.
The case where the light is defocused further downward is shown, and the sum of the amounts of light received by the light receiving elements 141a to 141d is calculated as follows.
It is larger than the sum of the received light amounts of 2a to 142d.

Therefore, the focus error signal is set to FES.
If the light receiving amounts of the light receiving elements 141a to 141d are P1a to P1d and the light receiving amounts of the light receiving elements 142a to 142d are P2a to P2d, respectively, the focus error signal F
ES can be expressed by the following equation. FES = (P1a + P1d + P2b + P2c)-(P2a + P2d + P1b + P1c) (1) If focus control is performed so that the focus error signal FES shown in the above equation (1) becomes zero, the irradiation spot can be focused on the data track.

The above floating type optical head is used in the optical recording medium 11
By the rotation of 0, the optical recording medium 110 floats at a substantially constant interval. However, the light spot may not be focused on the recording film 112 of the optical recording medium 110 due to fluctuations in the flying height, fluctuations in the wavelength of the laser light L, and errors caused by processing accuracy. In the levitation type optical head of the first embodiment described above, the optical head 1 is displaced in the vertical direction by applying currents of the same polarity to the drive coils 61a and 61b to perform focus control.

With respect to the undulation of the data track due to the eccentricity, the tracking means for performing the tracking control for displacing the optical head 1 in the left and right direction of the data track by supplying the drive coils 61a and 61b with the currents of the opposite polarities. Make them follow.

In response to the movement of the optical head 1 as described above, F
Since the PC 70 is deformed and follows the displacement portion 71, the influence on the focus control and the tracking control is reduced.
Therefore, the load applied to the drive coils 61a and 61b can be reduced, so that the drive coils 61a and 61b can be easily reduced in size and weight.

Next, an optical head composite body 102 according to a second embodiment of the present invention will be described with reference to FIGS. 8 and 9.

The optical head composite body 102 of the second embodiment has substantially the same structure as the optical head composite body 101 of the first embodiment, and is different from the optical head composite body 101 of the first embodiment.
This is a connection state between the FPC and the substrate. That is, F in FIG.
As shown in the back view of the PC, first, in the optical head composite 102 of the second embodiment, the wiring terminal portion 74 of the FPC 70 is provided.
As the connecting means for connecting the substrate power source terminal and the substrate signal terminal 76 of the substrate 10B to the gold wire 77 in the first embodiment.
Instead of the above, it is different from the first embodiment in that it is fixedly connected directly with solder or the like. Secondly, the FP in the first embodiment
Instead of forming the fixed portion 73 and the displaced portion 71 of the C70, the displaced portion 78 and the fixed portion 75 are formed, and the FPC 70 as the wiring means also serves as the supporting means, which is different from the first embodiment.

FIG. 9 is a sectional view showing the structure of an optical head composite body 102 according to the second embodiment of the present invention. in this case,
One end of the FPC 70 is fixed to the lower surface of the board 10B,
The magnets 53a and 53b are fixed to the fixed portion 75 of C70.

In this way, the FPC 70 and the fixing portion 7 of the FPC are
A displacement portion 78 is formed between the FPC 70 and the fixed portion 75.
By lowering the bending rigidity between the optical head 2 and the optical head 2, the optical head 2 is elastically supported so as to facilitate a minute displacement in the focus direction 16. Then, unlike the optical head composite body 101 of the first embodiment, the connection portion is fixed directly with solder or the like without using a gold wire or the like, so that the strength of the connection portion is improved and the focus control is affected. Without light emitting element 1
1 and the light receiving element 13 can be supplied with power, and the optical head composite 102 having higher reliability can be provided. Further, unlike the optical head composite body 101 of the first embodiment, the slider supporting member 80 is not required, so that the number of constituent parts can be reduced and the weight can be reduced.

The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the claims of the present invention, and any device having the same function and effect can be realized by the present invention. It is included in the technical scope of the invention.

For example, in the first and second embodiments, the spherical concave lens is described as an example of the optical member 20, but the present invention is not limited to this, and other spherical lenses, Fresnel lenses, and diffractive lenses are used. It may be a grating or a hologram lens.

[0077]

As described above, according to the first invention having the above-mentioned structure, the optical head, the slider, the supporting means and the wiring means are integrated, so that the parts constituting the optical recording / reproducing head are formed. Can be integrated, and the size and weight of the optical head can be reduced. Further, the optical recording / reproducing head can be integrally molded. Therefore, there are advantages that the price of the optical head can be reduced, the processing accuracy and the assembly accuracy can be improved, and the high recording density can be easily achieved.

According to the second aspect of the present invention having the above structure, the optical head, the focus control means, the slider, the supporting means, and the wiring means are integrated, so that the optical recording / reproducing head is further integrated. It is possible to reduce the size, reduce the weight, reduce the price, and increase the recording density.

Further, according to the third invention of the present invention having the above structure, in the optical recording / reproducing apparatus, the optical head composite according to the first invention or the second invention is used as a recording / reproducing head portion. Therefore, it is possible to realize downsizing, weight reduction, cost reduction, high recording density, and the like of the optical recording / reproducing apparatus.

[Brief description of drawings]

FIG. 1 is a perspective view showing the overall configuration of an optical head composite body according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the connecting portion between the FPC and the substrate in the optical head composite body according to the first embodiment of the present invention as seen from the back surface of the FPC.

FIG. 3 is a perspective view showing components of the optical head composite body according to the first embodiment of the invention.

FIG. 4 is a sectional view showing the structure of an optical head composite body according to the first embodiment of the present invention.

FIG. 5 is a bottom view showing an optical path correction portion and a light transmission window in the optical head composite body according to the first embodiment of the present invention.

FIG. 6 is a perspective view showing a configuration of a raising mirror, a light emitting element, and a light receiving element in the optical head composite body according to the first embodiment of the present invention.

7A is a diagram showing a focused state for explaining a focus control operation in the light receiving element in the optical head composite body according to the first embodiment of the present invention. FIG. 7B is a diagram showing the focused state of the first embodiment of the present invention. FIG. 3C is a diagram illustrating a state in which the focus is shifted upward from the recording surface of the optical recording medium for explaining the focus control operation in the light receiving element in the optical head composite. FIG. FIG. 6 is a diagram illustrating a state in which the focus is deviated below the recording surface of the optical recording medium for explaining the focus control operation in FIG.

FIG. 8 is a perspective view of a connecting portion between the FPC and the substrate of the optical head in the optical head composite body according to the second embodiment of the present invention, as viewed from the back surface of the FPC.

FIG. 9 is a sectional view showing the structure of an optical head composite body according to a second embodiment of the present invention.

FIG. 10 is a diagram illustrating the configuration of a conventional floating optical head.

[Explanation of symbols]

 1, 2 optical head 3 flying slider 8 arms 10A, 10B substrate 11 light emitting element 12 rising mirror 13 light receiving element 14 data track direction 15 data track orthogonal direction 16 focus direction 17 sloped surface 18 mirror lower surface 19 mirror upper surface 20 optical member 21 light collection Part 22 Reflective film 23 Incident part 25 Optical path correction part 26 Light transmission window 27 Support part 28 Recessed part 30 Flying slider body 31 Objective lens 32 Polarizing mirror 33 Polarizing element 34 Through hole 35 Beam splitter 36 Convex part 37 Driving member 38 Condensing lens 39 Cylindrical lens 40 Optical head support portion 41 Branch member 42 Opening 44 Polarizing plate 46 Condensing lens 47 Air bearing surface 53a, 53b Magnet 60 Focus coil portion 61a, 61b Drive coil 63 Bobbin 64 Yoke 70 FPC 71,7 Displacement portion 72 Circuit portion 73, 75 Fixed portion 74 Wiring terminal portion 76 Substrate power supply terminal and substrate signal terminal 77 Gold wire 80 Slider support member 81 Wide portion 82 Gimbal portion 83 Bent portion 84 Pressing spring portion 85 Fixed portion 86 Caulking portion 90 Arm 91 Fixing hole 101,102 Optical head composite 110 Optical recording medium 111 Substrate 112 Recording film 113 Protective film 141a-141d, 142a-142d Light receiving element 151,152 Light receiving spot 200 Floating optical head L light

Claims (12)

[Claims] 1. A substrate having a light emitting element and a light receiving element, and an optical member for condensing light from the light emitting element to irradiate the optical recording medium and guiding light reflected from the optical recording medium to the light receiving element. An optical head having: a flying slider configured to fly while maintaining a gap between the optical recording medium by rotation of the optical recording medium; and a supporting means for supporting the optical head on the flying slider. An optical head composite body comprising: a wiring means for supplying power to the light emitting element and the light receiving element and for leading a signal from the light receiving element to a signal processing means. 2. A substrate having a light emitting element and a light receiving element, and an optical member for converging light from the light emitting element to irradiate the optical recording medium and guiding light reflected from the optical recording medium to the light receiving element. An optical head having: a focus control unit that moves the optical head in a focus direction that is a direction in which the optical recording medium is brought into contact with and separated from the optical recording medium; and a gap is maintained between the optical recording medium by rotation of the optical recording medium. A flying slider configured to fly while supporting the flying head so that the optical head is supported by the flying slider so as to be movable in the focal direction.
An optical head composite body, characterized in that power supply to the light emitting element and the light receiving element and wiring means for leading a signal from the light receiving element to a signal processing means are integrated. 3. The light according to claim 2, wherein the focus control means includes a coil provided in the optical head and a magnet for generating a magnetic flux interlinking with a magnetic flux of the coil. Head complex. 4. The optical head according to claim 2, wherein a part of the wiring means is fixed to the substrate, and the wiring means is movably supported in the focal direction. Complex. 5. The light-emitting element, wherein the wiring means includes a fixing portion that fixes a part of the wiring means to the substrate, a displacement portion that is formed in a thin branch shape and that is elastically connected to the fixing portion. And a wiring terminal section having a wiring power supply terminal for supplying power to the light receiving element and a wiring signal terminal for taking out a signal from the light receiving element, wherein the substrate is a substrate power supply terminal for supplying power to the light emitting element and the light receiving element. And a substrate terminal portion having a substrate signal terminal for extracting a signal from the light receiving element, wherein the wiring terminal portion and the substrate terminal portion are connected by an electrically connectable connecting means. Item 5. The optical head composite according to item 4. 6. The optical head composite body according to claim 5, wherein the connecting means is configured to follow the elastic displacement of the displacement portion. 7. The optical head composite body according to claim 5, wherein the connecting means fixedly connects the wiring terminal portion and the substrate terminal portion. 8. The optical head composite body according to claim 7, wherein the wiring means also serves as the supporting means. 9. The optical head composite according to claim 1, wherein the optical member has a spherical lens, a Fresnel lens, a diffraction grating or a hologram lens. 10. The raising member having a half-mirror slope for reflecting the light from the light emitting element substantially perpendicularly to the substrate and transmitting the light from the optical recording medium, and the optical member. An optical path correction unit that reflects light that has passed through the rising mirror and that reflects light from the optical recording medium in the direction of the rising mirror; and light that has passed through the optical path correction unit from the light emitting element of the optical recording medium. 10. The optical head composite according to claim 1, further comprising: a reflection film that reflects the light from the optical recording medium toward the optical path correction unit while reflecting the light toward the optical path correction unit. . 11. The light-receiving element has a first light-receiving element and a second light-receiving element, which are divided into four substantially parallel to a data track direction and are arranged substantially in series in a dividing direction, and the raising mirror comprises the half mirror. It has a pair of parallel planes sandwiching a mirror slope, and one of the parallel planes is the first plane.
The light from the optical recording medium is disposed on the light receiving element and the second light receiving element, and the light from the optical recording medium is transmitted through the half mirror slope to be guided to the first light receiving element and reflected by the first light receiving element. 11. The optical head composite body according to claim 10, wherein light is reflected by the other surface of the parallel surface and guided to the second light receiving element. 12. An optical head composite according to claim 1, wherein information is recorded on and reproduced from a rotating optical recording medium, and the optical head composite is provided on a data track of the optical recording medium. An arm member that is movably supported in a transverse direction; and a tracking unit that moves the arm member to track a light spot emitted from the optical head composite on a data track of the optical recording medium. An optical recording / reproducing apparatus characterized by.