JPH07272303A - Optical disk device, optical pickup and method of assembling optical pickup - Google Patents

Abstract

PURPOSE:To reduce the number of amplifier circuits, to simplify and miniaturize the constitution of an optical pickup and to simplify assembling work by amplifying a signal generated with addition by a side beam amplifier circuit. CONSTITUTION:A reflected main beam from an optical disk is light-received by photodetectors A-D of the optical pickup 21, and a reflected side beam is received by the photodetectors E and F, G and H. Then, the detection outputs of respective detectors A-D are amplified by amplifiers 15A-15D, and the additional detection outputs of the detectors E and G, F and H are amplified by the amplifiers 15E, 15H respectively to be supplied to a matrix circuit 23, and a tracking error signal TE is generated. By simple constitution capable of reducing the number of amplifiers by corresponding one amplifier to a pair of photodetectors for side beam, the small-sized optical pickup whose assembling work is simplified is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device, an optical pickup used for the same, and an assembling method thereof.

[0002]

2. Description of the Related Art Conventionally, in an optical pickup applied to an optical disk device such as a magneto-optical disk device, a semiconductor laser emits a light beam and a diffraction grating is used to divide the light beam into a main beam and side beams. Thus, tracking control is performed using this side beam.

As shown in FIG. 3, in this type of optical pickup 1, a light beam L1 is emitted from a semiconductor laser 2.
And the light beam L1 is incident on the diffraction grating 3.
Here, the diffraction grating 3 splits the light beam L1 into 0th-order diffracted light (main beam) and + 1st-order and -1st-order diffracted light (side beam), and the main beam and the side beam are collimator lens 4 Inject.

The collimator lens 4 converts the main beam and the side beam into parallel rays and outputs the parallel rays to the prism 5. The prism 5 is formed by adhering the inclined surface of the right-angled prism 7 to the inclined surface of the parallelogram-shaped prism 6, and forming this beam splitter.

The prism 5 reflects a part of the main beam and the side beam on the inclined surface forming the beam splitter, transmits the rest, and makes the reflected light of the part enter the photodetector 8. As a result, the optical pickup 1 detects the emitted light amount of the semiconductor laser 2 using the photodetector 8 and holds the light amount of the light beam L1 at a predetermined value based on the light amount detection result.

The raising mirror 9 is formed by a right-angle prism, and the main beam and the side beam transmitted through the inclined surface of the prism 5 are bent at right angles so that the main beam and the side beam are recorded on the magneto-optical disk. Eject toward the surface. The objective lens 10 is
The main beam and side beams emitted from the raising mirror 9 are focused on the information recording surface of the magneto-optical disk. Thus, in the magneto-optical disk device, a predetermined modulation magnetic field is applied to the irradiation position of the main beam to thermomagnetically record desired information.

Further, at this time, in the magneto-optical disk device, the light beam of the side beam is located at a position separated by about 1/2 track pitch on the inner and outer peripheral sides of the magneto-optical disk centering on the light spot of the main beam. Is selected so that the main beam is off-tracked, the light amount distribution of the reflected light of the side beam is changed accordingly.

Thus, the objective lens 10 receives the reflected light of the main beam and the side beam obtained from the information recording surface of the magneto-optical disk and guides it to the rising mirror 9. In the magneto-optical disk device,
On the basis of the result of receiving the reflected light, the thermomagnetically recorded information is reproduced at the time of reproduction, and at the time of recording / reproduction, the objective lens 10 is moved vertically and horizontally to perform tracking control and focus control.

That is, the reflected light received by the objective lens 10 is reflected by the rising mirror 9 at a right angle, then enters the prism 5, and is reflected by the inclined surface of the prism 5. The prism 5 reflects the reflected light reflected by this slope on the other slope of the parallelogram prism 6 and emits it.

The Wollaston prism 11 divides the reflected light emitted from the prism 5 into P-wave components and S-wave components and emits them. The collimator lens 12 reflects the reflected light emitted from the Wollaston prism 11. Light receiving element 13
Focus on. In the optical pickup 1, the multi-lens 14 is provided between the collimator lens 12 and the light receiving element 13.
The optical path length between the collimator lens 12 and the light receiving element 13 is thereby shortened and the overall shape is reduced.

As a result, the optical pickup 1 forms a main beam light spot and a side beam light spot on the light receiving surface of the light receiving element 13 for the P wave component and the S wave component of the reflected light. The magneto-optical disk device reproduces the thermomagnetically recorded information by utilizing the Kerr effect by detecting a change in the amount of reflected light between the P wave component and the S wave component. A focus error signal and a tracking error signal are formed based on the light receiving results of the main beam and the side beam, and focus control and tracking control are performed based on the focus error signal and the tracking error signal.

For the tracking error signal, by applying a so-called double push-pull tracking error signal generation method, the DC fluctuation of the tracking error signal due to the movement of the objective lens 10 and the radial skew of the magneto-optical disk can be effectively performed. I try to avoid it.

Specifically, as shown in FIG. 4, the light receiving element 13 applied to this tracking error signal generating method.
Generates a tracking error signal using eight photo detectors represented by symbols A to H. Of these, the four photodetectors A to D are formed by dividing a rectangular light receiving surface into a square shape. On the other hand, the remaining four photodetectors E to H are formed by vertically dividing the light receiving surface of the rectangular light receiving surface which is vertically symmetrically formed.

In the light receiving element 13, photodetectors are arranged on the left and right of the four photodetectors A to D, and a reproduction signal is generated by using these photodetectors. The optical pickup 1 converts the output currents of the photodetectors A to H into current-voltage conversion circuits 15A to 15H, respectively, and then outputs them to a built-in matrix circuit.

As a result, the optical pickup 1 is shown in FIG.
As shown in (A), the main beam is focused on the four photodetectors A to D formed in the center to form a light spot M, and the photodetectors E, F, G, and H formed on the upper and lower sides are respectively provided with side beams. The beams are condensed to form light spots S1 and S2, and the tracking error signal TE is generated using the main beam and the side beams.

Specifically, the side beam light spot S
In No. 1, in accordance with the movement of the objective lens 10 and the radial skew of the magneto-optical disk, the incident light amounts of the photodetectors G and H change complementarily as in the case where a tracking error occurs. In the side beam light spot S2, similarly, the incident light amounts of the photodetectors E and F change complementarily according to the movement of the objective lens 10 and the radial skew of the magneto-optical disk. However, in the side beam light spots S1 and S2,
In the photodetectors E, F, G, and H, the light amount changes in the same direction with respect to the movement of the objective lens 10 and the radial skew of the magneto-optical disk, but the light amount changes so as to be opposite to the tracking error. To do.

As a result, the optical pickup 1 has the addition circuit 16A in the matrix circuit 16 of FIG.
And 16B are used to cancel the fluctuation of the light amount which changes with the movement of the objective lens 10 and the radial skew of the magneto-optical disk. That is, the photo detector G
And H and the photodetectors E and F, current-voltage conversion circuits 15G and 1 are provided between the photodetectors G and E and the photodetectors F and H, which are arranged inside and outside.
5E and the output signals of the current-voltage conversion circuits 15F and 15H are added.

Further, the optical pickup 1 uses the adder circuits 16C and 16D so as to correspond to the output signals of the adder circuits 16A and 16B for the photodetectors A to D having the light receiving surface in the shape of a square. Conversion circuits 15A and 15D, current-voltage conversion circuits 15B and 15C
After adding the output signals of the above, the subtracting circuit 16E subtracts the output signal of the adding circuit 16D from the output signal of the adding circuit 16C.

Furthermore, the optical pickup 1 corresponds to the subtraction processing of the subtraction circuit 16E so as to correspond to the subtraction circuit 16F.
Then, the output signal of the adder circuit 16B is subtracted from the output signal of the adder circuit 16A. As a result, the magneto-optical disk device 1
This subtraction circuit 16F output from the matrix circuit 16
By subtracting the output signals of 16 and 16F by the subtraction circuit 17, the tracking error signal TE is generated so as to cancel the fluctuation of the light amount which changes with the movement of the objective lens 10 and the radial skew of the magneto-optical disk.

[0020]

By the way, in order to correctly detect the tracking error signal TE in this way, the photodetectors A arranged at the center and at the top and bottom, respectively.
It is necessary to correctly collect the main beam and the side beam for .about.H. That is, when the light receiving element 13 is attached to the main axis of the objective lens 10 with an offset, the light spot M of the main beam has the lower photodetectors E and F (FIG. 5B) or the upper photodetectors G and H ( In some cases, the light may be condensed in FIG.

However, when the tracking error signal TE is generated by applying this method, even in such a case,
In the output signal of the subtraction circuit 17, the signal level apparently changes in accordance with the off-track amount, like the tracking error signal TE. For this reason, as shown in FIG. 6, in this type of magneto-optical disk device, at the time of assembly, the adjustment matrix circuit 18 is connected instead of the matrix circuit 16, and the test signal TS output from the adjustment matrix circuit 18 is connected. The optical pickup 1 is adjusted with reference to.

In the adjusting matrix circuit 18, in each of the adding circuits 18A and 18B, the current-voltage converting circuits 15E to 15E are provided between the photodetectors G and H arranged on the upper side and the photodetectors E and F arranged on the lower side, respectively.
The output signals of 15H are added, and this added signal is subtracted by the subtraction circuit 1
Subtract at 8C. That is, the photo detectors G and H arranged on the upper side, or the photo detector E arranged on the lower side.
And F when the main beam is focused (that is, in the cases of FIGS. 5B and 5C, respectively), the output signal TS of the subtraction circuit 18C is the photodetectors G and H on which the main beam is focused or Photo detector E
, And F, the signal level rises to the positive side or the negative side.

On the other hand, when the main beam is correctly focused on the photo detectors A to D arranged in the center (that is, in the case of FIG. 5A), the output signal TS is held at 0 level. As a result, this optical pickup 1
In the manufacturing process, after adjusting the position of the light receiving element 13 to the correct position with respect to the objective lens 10 so that the output signal TS is held at 0 level, the matrix circuit 16 is replaced by the matrix circuit 16 for adjustment. It is designed to connect.

If the replacement work of the matrix circuit 18 can be omitted, it is considered that the assembly work of the optical pickup can be simplified accordingly. In addition to this, it would be convenient if this type of optical pickup could be further simplified and downsized.

The present invention has been made in view of the above problems, and has an optical disc device capable of simplifying and downsizing the entire structure and further simplifying the assembling work, an optical pickup used for the optical disc device, and the same. An object is to provide an assembling method.

[0026]

According to the first aspect of the present invention, the above object is obtained by splitting a light beam emitted from a laser light source into a main beam and a side beam to irradiate the optical disc, and obtaining the optical beam from the optical disc. In the optical disc device for receiving the reflected light of the main beam and the side beam and reproducing the data recorded on the optical disc based on the received result of the reflected light, a main beam light receiving element for receiving the reflected light of the main beam And output signals are amplified for the first and second side beam light receiving elements, which are respectively arranged on both sides of the main beam light receiving element and receive the reflected light of the side beam, and the main beam light receiving element. The output signals of the main beam amplifier circuit that outputs the light and the first and second light receiving elements of the side beam are increased. A side beam amplifying circuit for outputting the same and a tracking control circuit for performing tracking control by generating a tracking error signal from the output signal of the side beam amplifying circuit, and the side beam first and second light receiving elements Divides the light receiving surface into a first light receiving surface on the light receiving element side of the main beam and a second light receiving surface on the side opposite to the light receiving element side of the main beam, and the first and second light receiving surfaces are divided. The side beam amplifying circuit outputs the output current from the first light receiving surface of the first light receiving element and the second side beam amplifying circuit outputs the output current from the first light receiving surface of the first light receiving element.
A first amplifier circuit that adds the output signal output from the second light receiving surface of the light receiving element to obtain an addition signal, amplifies and outputs the addition signal, and the first light receiving element of the first light receiving element. An output signal output from the second light receiving surface and an output signal output from the first light receiving surface of the second light receiving element are added to obtain an addition signal, and the addition signal is amplified and output. And a second amplifying circuit for generating the tracking error signal by subtracting an output signal between the first and second amplifying circuits. It

Further, in the second aspect of the present invention, the first amplification circuit includes the first light receiving surface of the first light receiving element and the first light receiving element of the second light receiving element. By connecting the two light receiving surfaces, the output signal output from the first light receiving surface of the first light receiving element and the output signal of the second light receiving surface of the second light receiving element are output. The second amplification circuit is configured to obtain the addition signal by adding the output signal to the second light receiving surface of the first light receiving element and the second light receiving element of the second light receiving element. By connecting the first light receiving surface to the second light receiving surface of the first light receiving element, the second output signal and the second light receiving surface of the first light receiving element are connected.
The optical disc device configured to add the output signal output from the first light-receiving surface of the light-receiving element to obtain the added signal.

Further, in the third invention, the above object is as follows.
The first amplifier circuit includes the first light receiving element of the first light receiving element.
Or the second light receiving surface of the second light receiving element is connected to the input end of the first amplifying circuit in advance, and the second light receiving element of the second light receiving element is connected via a predetermined connecting means. The first light receiving surface of the first light receiving element or the first light receiving surface of the first light receiving element is connected to the input end of the first amplifier circuit.
Connecting the first light receiving surface of the light receiving element to the second light receiving surface of the second light receiving element, and the second amplifier circuit is configured to connect the second light receiving element of the first light receiving element. Surface or the first light receiving surface of the second light receiving element is connected to the input end of the second amplifying circuit in advance, and the first light receiving element of the second light receiving element is connected through a predetermined connecting means. By connecting the surface or the second light-receiving surface of the first light-receiving element to the input end of the second amplifier circuit,
This is achieved by an optical disk device in which the light receiving surface of (1) and the first light receiving surface of the second light receiving element are connected.

Further, in the fourth aspect of the present invention, the connecting means connects the first light receiving surface of the first light receiving element to the first light receiving surface by short-circuiting terminals formed in advance. , Connecting the second light receiving surface of the second light receiving element to the second light receiving surface of the first light receiving element and the first light receiving surface of the second light receiving element. This is achieved by an optical disk device which is composed of short-circuiting means that are connected.

In the fifth aspect of the present invention, the above object is to divide the light beam emitted from the laser light source into a main beam and a side beam to irradiate the optical disc, and to obtain the main beam obtained from the optical disc. And an optical pickup that receives the reflected light of the side beam and outputs the reception result of the reflected light, and is arranged on both sides of the main beam light receiving element that receives the reflected light of the main beam and the light receiving element of the main beam. The first side beam for receiving the reflected light of the side beam.
And a second light receiving element, a main beam amplifier circuit that amplifies and outputs an output signal for the main beam light receiving element, and an output signal for the first and second light receiving elements of the side beam. A side beam amplifier circuit for outputting the side beam, and a tracking error signal generation circuit for generating a tracking error signal from the output signal of the side beam amplifier circuit and outputting the tracking error signal. Divides the light receiving surface into a first light receiving surface on the light receiving element side of the main beam and a second light receiving surface on the side opposite to the light receiving element side of the main beam, and the first and second light receiving surfaces are divided. From the first light receiving surface of the first light receiving element, and the side beam amplifying circuit outputs the output current from the second light receiving element before the second light receiving element. A first amplifier circuit that adds an output signal output from the second light receiving surface to obtain an added signal, amplifies and outputs the added signal, and the second light receiving surface of the first light receiving element. A second amplification that adds an output signal output from the second light receiving element and an output signal output from the first light receiving surface of the second light receiving element to obtain an addition signal, and amplifies and outputs the addition signal. And a tracking error signal generation circuit between the first and second amplification circuits,
This is accomplished by an optical pickup that produces the tracking error signal by subtracting the output signal.

Further, in the sixth aspect of the present invention, the first amplifying circuit includes the first light receiving surface of the first light receiving element and the first light receiving element of the second light receiving element. By connecting two light receiving surfaces, the output signal output from the first light receiving surface of the first light receiving element and the second light receiving surface
Of the second light receiving element of the first light receiving element, the second amplifying circuit is configured to add the output signal output from the second light receiving surface of the second light receiving element of the first light receiving element, By connecting the light receiving surface of the second light receiving element to the first light receiving surface of the second light receiving element, and by connecting the output signal output from the second light receiving surface of the first light receiving element and the second light receiving surface of the second light receiving element. This is achieved by an optical pickup configured to add the output signal output from the first light receiving surface of the light receiving element to obtain the added signal.

In the seventh invention, the above object is as follows.
The first amplifier circuit includes the first light receiving element of the first light receiving element.
Or the second light receiving surface of the second light receiving element is connected to the input end of the first amplifying circuit in advance, and the second light receiving element of the second light receiving element is connected via a predetermined connecting means. The first light receiving surface of the first light receiving element or the first light receiving surface of the first light receiving element is connected to the input end of the first amplifier circuit.
Connecting the first light receiving surface of the light receiving element to the second light receiving surface of the second light receiving element, and the second amplifier circuit is configured to connect the second light receiving element of the first light receiving element. Surface or the first light-receiving surface of the second light-receiving element is connected in advance to the input end of the first amplifier circuit, and the first light-receiving element of the second light-receiving element is connected through a predetermined connecting means. By connecting the surface or the second light receiving surface of the first light receiving element to the input end of the first amplifying circuit, and thereby the second light receiving element of the first light receiving element is connected.
This is achieved by an optical pickup configured so as to connect the light receiving surface of (1) and the first light receiving surface of the second light receiving element.

In the eighth aspect of the present invention, the connecting means connects the first light receiving surface of the first light receiving element to the first light receiving surface by short-circuiting terminals formed in advance. , Connecting the second light receiving surface of the second light receiving element to the second light receiving surface of the first light receiving element and the first light receiving surface of the second light receiving element. This is achieved by an optical pickup that is connected and is composed of short-circuiting means.

Further, the above object is, in the ninth invention, the output signal output from the first light receiving surface of the first light receiving element or the second light receiving element of the second light receiving element in the first amplifier circuit. The output signal output from the light receiving surface of 2 is amplified and output,
In the second amplifier circuit, the output signal output from the second light receiving surface of the first light receiving element or the output signal output from the first light receiving surface of the second light receiving element is amplified. In this state, the main beam and the side beam are respectively received by the corresponding main beam light receiving element and the side beam first and second light receiving elements with reference to the output signal of the tracking error signal generation circuit. Output signal output from the first light receiving surface of the first light receiving element or the second light receiving surface of the second light receiving element in the first amplifier circuit after adjustment to Instead of the output signal, these added signals are amplified and output,
In the second amplifier circuit, the output signal output from the second light receiving surface of the first light receiving element or the output signal output from the first light receiving surface of the second light receiving element. Instead, it is achieved by an assembling method of an optical pickup in which connections are switched so as to amplify and output these added signals.

In the tenth aspect of the present invention, the above object is achieved by an optical pickup assembling method in which the terminals formed in advance are short-circuited by a predetermined connecting means to switch the connection. To be done.

[0036]

The operation of the present invention will be described below on the basis of the above-mentioned constitutions. In this description, the reference numerals of the embodiments are attached for convenience of understanding, but the present invention is not limited to the configurations corresponding to the reference numerals of the embodiments.

According to the configuration of the first invention described above, after the addition signals are generated in the side beam amplification circuits 15E and 15H, the addition signals are amplified and output, so that the amplification circuits in the optical disk device. Can be reduced.

Further, according to the structure of the second invention, the light receiving surface E and the light receiving surface G, the light receiving surface F and the light receiving surface H are connected to each other to generate an addition signal.
The addition signal can be easily generated.

Further, according to the structure of the third invention, the predetermined light receiving surface E or G and the first amplifying circuit 15E, and the predetermined light receiving surface F or G and the second amplifying circuit 15H are preliminarily connected and predetermined. By connecting the remaining light-receiving surface to the connection means 25 and 26 via the connection means 25, the optical disk device can switch the connection as necessary and perform operations such as adjustment.

Further, according to the structure of the fourth invention, the connection can be easily switched by short-circuiting the predetermined terminals 27, 28, 29, 30 with the short-circuiting means.

Further, according to the configuration of the fifth invention, after the addition signal is generated in the side beam amplification circuits 15E and 15H, the addition signal is amplified and output, whereby the amplification circuit of the optical pickup is operated. The number can be reduced.

Further, according to the configuration of the sixth invention, the light receiving surface E and the light receiving surface G, the light receiving surface F and the light receiving surface H are connected to generate an addition signal, so that the addition signal can be easily generated in the optical pickup. Can be generated.

Further, according to the structure of the seventh invention, the predetermined light receiving surface E or G and the first amplifying circuit 15E, and the predetermined light receiving surface F or G and the second amplifying circuit 15H are preliminarily connected and predetermined. By connecting the remaining light-receiving surface to the connection means 25 and 26 via the connection means 25, the optical pickup can switch the connection as necessary and perform operations such as adjustment.

Further, according to the structure of the eighth invention, the connection can be easily switched by short-circuiting the predetermined terminals 27, 28, 29, 30 with the short-circuiting means.

Further, according to the configuration of the ninth invention,
Instead of the addition signal, an output signal output from a predetermined light receiving surface E or G and an output signal output from the light receiving surface F or H are amplified and adjusted based on the output signal TS, By amplifying and outputting the addition signal instead of the surface output signal, the adjustment work can be completed without replacing the tracking error signal generation circuit. Further, according to the structure of the tenth aspect of the invention, the connection can be easily switched by short-circuiting the preformed terminals 27 to 30 by the predetermined connecting means 25 and 26 to switch the connection.

[0046]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
These aspects are not limited.

FIG. 1 is a connection diagram showing a configuration of a detection system of an optical pickup which is a main part of an optical disc device according to an embodiment of the present invention. The configuration of the optical system of the optical pickup used in the optical disc apparatus of this embodiment is shown in FIG.
Since it is the same as the one described above, duplicate description will be omitted. Further, in the structure of the optical pickup 21 of the present embodiment, in the structure other than the optical system, the parts denoted by the same reference numerals as those of the above-mentioned conventional example have the same structure as that of the above-mentioned conventional example, and therefore, the overlapping description will be omitted.

In the figure, the optical pickup 21 includes photodetectors E and G on the input sides of the current-voltage conversion circuits 15E and 15H in the matrix circuit 23, respectively.
Connect the output current lines of the photo detectors F and H,
Thus, with respect to the output currents of the photodetectors E and G and the photodetectors F and H, an added current of the output currents is generated in advance, and then the added currents are converted into current-voltage and output. On the other hand, with respect to the photodetectors A to D having the light receiving surface in the shape of a square, the current-voltage conversion circuit 15 is used by using the addition circuits 16C and 16D so as to correspond to the added current.
After adding the output signals of A and 15D and the current-voltage conversion circuits 15B and 15C, the addition circuit 16E is added by the subtraction circuit 16E.
The output signal of the adder circuit 16D is subtracted from the output signal of C.

On the other hand, the output currents of the current-voltage conversion circuits 15H and 15E are subtracted by the subtraction circuit 16F. This cancels the change in the light amount that changes with the movement of the objective lens 10 and the radial skew of the magneto-optical disk. Then, the subtraction circuit 16E
And the output signal of the subtraction circuit 16f are subjected to subtraction processing in the subtraction circuit 17 to generate a tracking error signal TE. As a result, even with such a configuration, the tracking error signal TE can be generated so as to cancel the change in the light amount that changes due to the movement of the objective lens 10 and the radial skew of the magneto-optical disk as in the conventional pickup. Therefore, the optical pickup 21 has the current-voltage conversion circuit 15G shown in FIG.
And 15F (FIG. 4) are omitted, and the matrix circuit 2
In FIG. 3, the adder circuits 16A and 16B (FIG. 4) are omitted.

As a result, the entire structure of the optical pickup 21 can be simplified and the overall shape can be reduced. Therefore, in the magneto-optical disk device to which this optical pickup is applied, the entire shape can be downsized and further simplified.

Particularly, since the current-voltage conversion circuit and the matrix circuit of this kind are integrated and integrally formed, the current-voltage conversion circuits 15G and 15F and the addition circuits 16A and 16B can be omitted. Accordingly, the number of pins of this integrated circuit can be reduced, and the package can be downsized. Further, by omitting the current-voltage conversion circuits 15G and 15F and the addition circuits 16A and 16B in this way, the number of connection lines connecting the integrated circuit current-voltage conversion circuit and the matrix circuit can be reduced accordingly. This also makes it possible to further reduce the size of the optical pickup.

Further, in this embodiment, the optical pickup 21 is formed by mounting the light receiving element 13 and the like on a predetermined printed circuit board, which is a photodetector F.
And G to current-voltage conversion circuits 15H and 15E, respectively.
In the wiring pattern up to, a pair of short lands 27 and 28, 29 and 3 are respectively formed on this wiring pattern.
0 is formed, and the short lands 27, 28 and 29 are formed.
The wiring pattern is formed so as to be disconnected between the wirings 30 and 30. As a result, in the optical pickup 21, the light receiving element 13 is adjusted in position after the wiring pattern is assembled in the state where the wiring pattern remains broken, and when this adjustment work is completed, the short lands 27 and 2 forming this pair are formed.
8 and 29 and 30 are short-circuited with predetermined conductive paints 25 and 26 to be assembled.

Therefore, in the process of assembling the optical pickup 21, the output signal of the light receiving element 13 is output in the same manner as in the case of the connection described above with reference to FIG. It is possible to output, so that the optical pickup 21 can be easily adjusted.

Further, after the adjustment is completed, the output of the light receiving element 13 can be output in the same manner as in the case of the connection described above with reference to FIG. 4 by a simple work of applying conductive paint between the short lands 27 and 28, 29 and 30. A signal can be output, so that the optical pickup 21 can be easily assembled.

Thus, according to the optical pickup 21 of this embodiment, it is possible to reduce the overall shape and the assembly work with a simple structure.

In the above-mentioned embodiment, the case where the light receiving surface is arranged in a square shape to receive the main beam has been described, but the present invention is not limited to this, and as shown in FIG.
It can be widely applied to the case of receiving the main beam by using the photodetectors A and B whose light receiving surface is divided into two in the direction of the side beam.

Further, in the above-mentioned embodiment, the case where the conductive paint is applied between the short lands 27 and 28, 29 and 30 has been described, but the present invention is not limited to this.
When a conductive resin such as a conductive adhesive is widely applied, when soldering between the short lands 27 and 28, 29 and 30, when connecting a connector for short circuit, further when a mechanical switch, Can be widely applied such as when a switch circuit formed of a semiconductor is arranged.

Further, in the above-mentioned embodiment, the case where the short lands are formed on the photodetector F and G sides has been described, but the present invention is not limited to this, and the short lands may be formed on the photodetector E and H sides. .

Further, in the above-mentioned embodiments, the photodetectors E and G and the photodetectors F and H, respectively.
Although the output currents of the photodetectors E and G and the photodetectors F and H are added by connecting the output current lines of the above, the present invention is not limited to this, and various addition methods can be widely applied. it can.

Further, in the above-described embodiment, the case where the output currents of the photodetectors are added in advance and the short lands are formed has been described, but the present invention is not limited to this, and the output signals of the photodetectors are simply added in advance. Alternatively, the signal may be amplified and output. By doing so, it is possible to simplify the entire configuration and reduce the size.

[0061]

As described above, according to the optical disk device, the optical pickup and the method for assembling the optical pickup according to the present invention, the overall shape can be reduced in size with a simple structure, and further, if necessary. By making it possible to switch the connection, the assembling work can be simplified.

[Brief description of drawings]

FIG. 1 is a connection diagram showing a main configuration of an optical pickup according to an embodiment of the present invention.

FIG. 2 is a connection diagram showing an optical pickup according to another embodiment.

FIG. 3 is a perspective view showing the overall configuration of an optical pickup.

FIG. 4 is a diagram showing a configuration of a conventional tracking and focusing error detection system of an optical pickup.

FIG. 5 is a schematic view for explaining one of the assembling steps of the conventional optical pickup.

6 is a connection diagram showing the connection of the optical pickup in the assembly process of FIG.

[Explanation of symbols]

 1, 21 Optical pickup 2 Laser diode 10 Objective lens 13 Light receiving element 15A to 15H Current-voltage conversion circuit 16, 18, 23 Matrix circuit A to H Photodetector

Claims (10)

[Claims] 1. A light beam emitted from a laser light source is divided into a main beam and a side beam and applied to an optical disc, and the reflected light of the main beam and the side beam obtained from the optical disc is received and the reflected light is obtained. In the optical disc device for reproducing the data recorded on the optical disc based on the light receiving result of, the main beam light receiving element for receiving the reflected light of the main beam, and the side beam arranged on both sides of the main beam light receiving element. Side beam first and second light receiving elements that receive the reflected light of the beam; a main beam amplifier circuit that amplifies and outputs an output signal for the main beam light receiving element; Regarding the second light receiving element,
A side beam amplification circuit that amplifies and outputs an output signal, and a tracking control circuit that generates a tracking error signal from the output signal of the side beam amplification circuit and performs tracking control are provided. The second light receiving element divides the light receiving surface into a first light receiving surface on the light receiving element side of the main beam and a second light receiving surface on the side opposite to the light receiving element side of the main beam. The output currents are respectively output from two light receiving surfaces, and the side beam amplifier circuit outputs the output signal output from the first light receiving surface of the first light receiving element and the second light receiving element of the second light receiving element. An output signal output from the second light receiving surface is added to obtain an addition signal,
A first amplifier circuit that amplifies and outputs the added signal; an output signal that is output from the second light receiving surface of the first light receiving element; and a first light receiving surface of the second light receiving element And a second amplifier circuit that adds the output signal output from the output signal to obtain the added signal and amplifies and outputs the added signal, wherein the tracking control circuit includes the first and second amplifier circuits. An optical disk device, wherein the tracking error signal is generated by subtracting an output signal between the two. 2. The first amplifier circuit, by connecting the first light receiving surface of the first light receiving element and the second light receiving surface of the second light receiving element,
The output signal output from the first light receiving surface of the first light receiving element and the output signal output from the second light receiving surface of the second light receiving element are added to perform the addition. The second amplifier circuit is configured to obtain a signal, and the second amplifier circuit connects the second light receiving surface of the first light receiving element and the first light receiving surface of the second light receiving element to each other. ,
The added signal obtained by adding the output signal output from the second light receiving surface of the first light receiving element and the output signal output from the first light receiving surface of the second light receiving element. The optical disk device according to claim 1, wherein the optical disk device is configured to obtain 3. The first amplifier circuit is configured such that the first light-receiving surface of the first light-receiving element or the second light-receiving surface of the second light-receiving element is provided in advance in the first amplifier circuit. The second end is connected to the input end and is connected through a predetermined connecting means.
By connecting the second light receiving surface of the light receiving element or the first light receiving surface of the first light receiving element to the input end of the first amplifier circuit, Is connected to the second light receiving surface of the second light receiving element, and the second amplifying circuit is configured to connect the second light receiving surface of the first light receiving element or the second light receiving surface of the first light receiving element. The first light receiving surface of the element is preliminarily connected to the input terminal of the second amplifier circuit, and the second light receiving surface of the second amplifying circuit is connected through a predetermined connecting means.
By connecting the first light-receiving surface of the light-receiving element or the second light-receiving surface of the first light-receiving element to the input end of the second amplifier circuit. 3. The optical disk device according to claim 2, wherein the light receiving surface of 1 is connected to the first light receiving surface of the second light receiving element. 4. The connection means short-circuits terminals formed in advance, so that the first light-receiving surface of the first light-receiving element and the second light-receiving element of the second light-receiving element. And a surface of the first light receiving element, and the second light receiving surface of the first light receiving element and the first light receiving surface of the second light receiving element. Item 5. The optical disk device according to item 3. 5. A light beam emitted from a laser light source is divided into a main beam and a side beam and applied to an optical disc, and the reflected light of the main beam and the side beam obtained from the optical disc is received and the reflected light is obtained. In the optical pickup that outputs the light reception result of, the main beam light receiving element that receives the reflected light of the main beam, and the side beam that receives the reflected light of the side beam, which are arranged on both sides of the light receiving element of the main beam, respectively. The first and second light receiving elements, the main beam light receiving element, a main beam amplifier circuit that amplifies and outputs an output signal, and the side beam first and second light receiving elements,
A side beam amplifying circuit for amplifying and outputting an output signal; and a tracking error signal generating circuit for generating and outputting a tracking error signal from the output signal of the side beam amplifying circuit, The second light receiving element divides the light receiving surface into a first light receiving surface on the light receiving element side of the main beam and a second light receiving surface on the side opposite to the light receiving element side of the main beam. The output current is output from each of the second light receiving surfaces, and the side beam amplification circuit outputs the output signal output from the first light receiving surface of the first light receiving element and the second light receiving element. And an output signal output from the second light receiving surface of
A first amplifier circuit for amplifying and outputting the added signal; an output signal output from the second light receiving surface of the first light receiving element; and a first light receiving surface of the second light receiving element And a second amplifier circuit that adds the output signal output from the output signal to obtain the added signal and amplifies and outputs the added signal, wherein the tracking error signal generation circuit includes the first and second An optical pickup, wherein the tracking error signal is generated by subtracting an output signal between amplifier circuits. 6. The first amplifier circuit connects the first light receiving surface of the first light receiving element and the second light receiving surface of the second light receiving element,
The addition signal obtained by adding the output signal output from the first light receiving surface of the first light receiving element and the output signal output from the second light receiving surface of the second light receiving element And a second amplifier circuit, by connecting the second light receiving surface of the first light receiving element and the first light receiving surface of the second light receiving element,
The added signal obtained by adding the output signal output from the second light receiving surface of the first light receiving element and the output signal output from the first light receiving surface of the second light receiving element. The optical pickup according to claim 5, wherein the optical pickup is configured to obtain 7. The first amplifying circuit is configured such that the first light receiving surface of the first light receiving element or the second light receiving surface of the second light receiving element is preliminarily set to the first light receiving surface of the first light receiving element. The second end is connected to the input end and is connected through a predetermined connecting means.
By connecting the second light receiving surface of the light receiving element or the first light receiving surface of the first light receiving element to the input end of the first amplifier circuit, Is connected to the second light receiving surface of the second light receiving element, and the second amplifying circuit is configured to connect the second light receiving surface of the first light receiving element or the second light receiving surface of the first light receiving element. The first light receiving surface of the element is connected to the input end of the first amplifier circuit in advance, and the second light receiving surface is connected through a predetermined connecting means.
By connecting the first light receiving surface of the light receiving element or the second light receiving surface of the first light receiving element to the input end of the first amplifier circuit, the second light receiving element of the first light receiving element 7. The optical pickup according to claim 6, wherein the light receiving surface of the second light receiving element is connected to the first light receiving surface of the second light receiving element. 8. The connection means short-circuits terminals formed in advance, so that the first light-receiving surface of the first light-receiving element and the second light-receiving element of the second light-receiving element. And a surface of the first light receiving element, and the second light receiving surface of the first light receiving element and the first light receiving surface of the second light receiving element. Item 7. The optical pickup according to item 7. 9. The first amplifier circuit amplifies an output signal output from the first light receiving surface of the first light receiving element or an output signal output from the second light receiving surface of the second light receiving element. And an output signal output from the second light receiving surface of the first light receiving element or an output signal output from the first light receiving surface of the second light receiving element in the second amplifier circuit. Are amplified and output, and in this state, the main beam light receiving element and the side beam first and second light receiving elements corresponding to the main beam and the side beam respectively refer to the output signal of the tracking error signal generation circuit. After being adjusted to receive light, in the first amplifier circuit, an output signal output from the first light receiving surface of the first light receiving element or the second light receiving surface of the second light receiving element. Output signal from Instead of the above, the added signal is amplified and output, and in the second amplification circuit, the output signal or the second output signal output from the second light receiving surface of the first light receiving element. A method of assembling an optical pickup, characterized in that the connection is switched so that an added signal of these light receiving elements is amplified and output instead of the output signal output from the first light receiving surface of the light receiving element. 10. The method for assembling the optical pickup according to claim 9, wherein the connection is switched by short-circuiting the terminals formed in advance by a predetermined connecting means. .