JP2002279686A - Method and device for assembling optical pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for assembling an optical pickup by which the optical pickup is assembled with high precision by preventing influence of a reflected light component of parallel light to parallelism adjusting parts facing each other. SOLUTION: The device for assembling the optical pickup 1 successively measures and adjusts position of a light receiving element 13 of an optical pickup unit 10 by PDS for detecting 6c, 7c of double knife edges 6, 7 on the way forward and the way backward. At one side of the double knife edges 6, 7 where no measurement is performed, a reflecting plate 8 for changing a direction of the reflected light is inserted at the middle of a route where after being branched by a beam splitter 3, the light proceeds to rotary parts 6b, 7b of the double knife edges 6, 7 to prevent the reflected light from returning in a direction of the beam splitter 3 as the reflected light. Accordingly the reflected light component from another side of the double knife edges 6, 7 is prevented from making incident and thereby an optical pickup device can be assembled with high precision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an optical pickup assembling method and an optical pickup assembling apparatus.
The present invention relates to an optical pickup assembling method and an optical pickup assembling method for assembling an optical pickup with high accuracy while preventing the reflected light component of parallel light from being applied to opposing parallel adjustment units.

[0002]

2. Description of the Related Art Generally, an optical pickup device transmits a light beam emitted from a semiconductor laser, which is a light source, through a diffractive element, converts the light beam into parallel light with a collimating lens, and irradiates the optical recording medium surface with an objective lens. The optical pickup device returns the original light path of the light reflected by the optical recording medium surface, diffracts the light by the diffraction element, and causes the light receiving element to receive the light, thereby performing signal detection.

Conventionally, there has been proposed a technique for increasing the light use efficiency by using a polarization hologram and obtaining a signal having a good S / N ratio (High Efficiency HOE Unit for DVD (2) Japan Society of Applied Physics, Spring 1998) reference).

In this technique, a signal is detected using a polarization hologram, and a reflection hologram is provided separately from the polarization hologram for detecting a monitor signal. This reflection hologram is provided on a substrate different from the polarization hologram. And are integrated by positioning and bonding.

That is, in an optical pickup device using a hologram, a light emitting element, a hologram, and a light receiving element are packaged (unitized) and adjusted and assembled in advance.
They are trying to simplify the assembly and adjustment of the optical pickup device into one component.

In this unit, the required accuracy of the relative positional relationship between the light emitting element, the hologram, and the light receiving element is high. As an adjustment method, conventionally, an optical system that is equivalent to or has the same effect as the optical system of the optical pickup device is prepared as an optical system of the adjustment device, and the light of the light emitting element in the unit is used as a reference. Assembly adjustment is performed. In order to achieve the same or the same effect as this optical system, it is necessary to ensure that the optical pickup device and the adjustment device are parallel to each other. In the adjustment of the optical pickup device, generally, the parallel light is adjusted on both the forward path and the return path by using a double knife edge method as a parallel light adjusting mechanism.

Conventionally, a light-emitting element, a light-receiving element for receiving reflected light of light emitted from the light-emitting element, and light emitted from the light-emitting element are collected on a reflection surface of a disk-shaped recording medium having a plurality of pits. In the method of adjusting a pickup including an objective lens that emits light and an optical element that applies irradiation light from a light emitting element to the objective lens and applies reflected light from the disk-shaped recording medium to a light receiving element, a comparison is made in which a pit is not formed. There has been proposed a method of adjusting a pickup that aligns the light emitting element, the light receiving element, the objective lens, and the optical element so that a light receiving intensity of the light receiving element becomes a maximum value by using a reflective plate having a smooth surface (Japanese Patent Application Laid-Open No. HEI 9-163572). No. 8-111,026).

[0008] That is, in this conventional pickup adjustment method, the irradiation light from the light emitting element is divided into a main beam and two sub-beams by a diffraction grating, and the divided main beam is passed through an objective lens to a smooth reflector. Focus on the reflective surface of.
The light reflected by the reflecting surface is split into two light beams by a hologram through an objective lens, and given to a light receiving element. The diffraction grating and the hologram are angularly displaced around the optical axis so that the total value of the received light intensity is maximized. Let me.

[0009]

However, such a conventional technique requires an improvement in assembling the optical pickup device with higher accuracy. That is, when an optical system that is equivalent to or has the same effect as the optical system of the optical pickup device is prepared as the optical system of the adjusting device and the assembly adjustment is performed based on the light of the light emitting element in the unit, In order to achieve the same or the same effect as an optical system, it is necessary to guarantee the parallelism between the optical pickup device and the adjustment device. Therefore, the parallel light adjustment accuracy is reduced, and there is a need for improvement in assembling the optical pickup device with higher accuracy.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical pickup assembling method and an apparatus thereof having a high-precision parallel light adjusting function by eliminating the influence of reflected light components from the parallel light adjusting sections facing each other. I do.

Specifically, the invention according to claim 1 has an optical system similar to or equivalent to the optical component of the optical pickup device, and the optical system includes a parallel light from a collimator lens and virtual optical information. The parallel light reflected by the mirror serving as the recording medium and passed through the objective lens is split by a beam splitter in a direction orthogonal to each optical axis at a position where the parallel light split by the beam is incident. When the parallel light adjusting units disposed opposite to each other detect the parallel light and adjust the position of the pickup unit based on the light detection result, the parallel light incident from the beam splitter to the parallel light adjusting unit. A reflective plate is provided so as to be movable between a passing position and a non-passing position of the reflected light component, and the reflecting plate is
The reflected light component is disposed so as to be inclined in a direction that prevents the reflected light component from returning to the beam splitter.When the reflection plate is adjusted by the parallel light adjustment unit provided with the reflection plate, the reflection plate is moved to the non-passing position, At the time of adjustment by the other parallel light adjustment unit,
By moving to the passing position, it is possible to prevent the reflected light component from the parallel light adjustment unit on the other side from being incident on the parallel light adjustment units disposed opposite to each other, and to improve the adjustment accuracy,
It is an object of the present invention to provide an optical pickup assembling method capable of assembling an optical pickup device with high precision by achieving an optical system which is equivalent to or has the same effect as the optical system of an optical pickup device.

According to a second aspect of the present invention, there is provided an optical system similar to or equivalent to an optical component of an optical pickup device, and the optical system includes a mirror serving as a parallel light from a collimating lens and a virtual optical information recording medium. The parallel light reflected by the objective lens and passing through the objective lens is split by a beam splitter in a direction orthogonal to the respective optical axes, and is arranged to face the position where the parallel light split by the beam is incident. When detecting the parallel light with the provided parallel light adjustment unit and performing position adjustment of the pickup unit based on the light detection result,
In the parallel light adjusting unit, a reflector is provided so as to be movable between a passing position and a non-passing position of the reflected light component of the parallel light incident from the beam splitter, and the reflector is returned to the beam splitter of the reflected light component. When the reflection plate is adjusted by the parallel light adjustment unit provided with the reflection plate, the reflection plate is moved to the non-passing position, and the reflection plate is moved by the other opposing parallel light adjustment unit. During the adjustment, the reflected light component from the parallel light adjustment unit on the other side is prevented from entering the parallel light adjustment units, which are arranged opposite to each other, by moving to the passing position, and the adjustment accuracy is improved. Accordingly, an object of the present invention is to provide an optical pickup assembling apparatus capable of assembling an optical pickup apparatus with high precision by achieving an optical system that is equivalent to or the same effect as the optical system of the optical pickup apparatus in a pseudo manner. That.

According to a third aspect of the present invention, there is provided an optical system similar to or equivalent to the optical component of the optical pickup device, wherein the optical system is a mirror which serves as a virtual light information recording medium with parallel light from a collimating lens. The parallel light reflected by the objective lens and passing through the objective lens is split by a beam splitter in a direction orthogonal to the respective optical axes, and is arranged to face the position where the parallel light split by the beam is incident. When detecting the parallel light with the provided parallel light adjusting unit and performing position adjustment of the pickup unit based on the light detection result,
The parallel light adjusting unit is disposed so as to be tiltable in a direction for preventing the reflected light component from returning to the beam splitter, and is tilted at the time of adjustment, and the reflected light component is returned to the other opposing parallel light adjusting unit. By blocking the light, it is possible to prevent the reflected light component from the parallel light adjustment unit on the other side from being incident on the parallel light adjustment units disposed opposite to each other, and to improve the adjustment accuracy.
It is an object of the present invention to provide an optical pickup assembling method capable of assembling an optical pickup device with high precision by achieving an optical system which is equivalent to or has the same effect as the optical system of an optical pickup device.

According to a fourth aspect of the present invention, there is provided an optical system similar to or equivalent to the optical component of the optical pickup device, wherein the optical system is a mirror which serves as a virtual light information recording medium with parallel light from a collimating lens. The parallel light reflected by the objective lens and passing through the objective lens is split by a beam splitter in a direction orthogonal to the respective optical axes, and is arranged to face the position where the parallel light split by the beam is incident. When detecting the parallel light with the provided parallel light adjustment unit and performing position adjustment of the pickup unit based on the light detection result,
The parallel light adjusting unit is disposed so as to be tiltable in a direction for preventing the reflected light component from returning to the beam splitter, and is tilted at the time of adjustment, and the reflected light component is returned to the other opposing parallel light adjusting unit. By blocking the light, it is possible to prevent the reflected light component from the parallel light adjustment unit on the other side from being incident on the parallel light adjustment units disposed opposite to each other, and to improve the adjustment accuracy.
An object of the present invention is to provide an optical pickup assembling apparatus capable of assembling an optical pickup apparatus with high accuracy by achieving an optical system which is equivalent to or has the same effect as the optical system of an optical pickup apparatus.

According to a fifth aspect of the present invention, the parallel light adjusting section includes:
The parallel light is detected by the double knife edge method, and by rotating about the axis parallel to the cutting line direction on the light beam cutting plane of the double knife edge, the mechanism of the rotating portion of the double knife edge is tilted. By tilting the reflected light component in a direction that prevents the reflected light component from returning to the beam splitter,
When the beam cutting line direction at the double knife edge is one direction, the adjustment accuracy at the parallel light adjustment unit is further improved, and an optical system that is equivalent to or has the same effect as the optical system of the optical pickup device is achieved. It is another object of the present invention to provide an optical pickup assembling method or an optical pickup assembling apparatus capable of assembling an optical pickup device with higher accuracy.

According to a sixth aspect of the present invention, the parallel light adjusting section comprises:
The parallel light is detected by the double knife edge method, and the beam split by the beam splitter passes through a point different from the center of the double knife edge condenser lens, or a straight line connecting the central axis of the condenser lens. By offsetting the reflected light component in the radiation direction and tilting the reflected light component in a direction that prevents the reflected light component from returning to the beam splitter, the accuracy of adjustment of the opposing parallel light adjustment units is further improved, and the optical It is an object of the present invention to provide an optical pickup assembling method or an optical pickup assembling apparatus capable of achieving an optical system equivalent to or having the same effect as that of the optical system and capable of assembling the optical pickup device with higher accuracy.

According to a seventh aspect of the present invention, the parallel light adjusting section comprises:
When the beam splitting line direction at the double knife edge is in one direction by making the beam split by the beam splitter pass through a point offset in the direction perpendicular to the beam cutting line direction of the double knife edge The direction in which the light amount distribution does not change due to the offset is the same as the direction of the light beam cutting line, and the adjustment accuracy of the collimating lens and the parallel light adjusting unit in which the center of the light beam is offset is further improved. It is an object of the present invention to provide an optical pickup assembling method or an optical pickup assembler capable of achieving an optical system equivalent to or having the same effect as an optical system of a pickup device and capable of assembling the optical pickup device with higher accuracy. I have.

[0018]

According to a first aspect of the present invention, there is provided an optical pickup assembling method, wherein a light emitting element, a light receiving element, and a hologram are integrally formed as a pickup unit, and light emitted from the light emitting element through the hologram is used as a light emitting element.
After being collimated by a collimator lens, the objective lens irradiates the optical information recording medium through an optical component that converges and irradiates the optical information recording medium, and reflects light from the optical information recording medium through the optical component to the pickup. An optical system similar to or equivalent to the optical component of the optical pickup device for recording and reproducing information on the optical information recording medium by irradiating the hologram of the unit and irradiating the light receiving element with the optical system; However, the parallel light from the collimating lens and the parallel light reflected by the mirror serving as the virtual optical information recording medium and passed through the objective lens are branched by the beam splitter in directions orthogonal to the respective optical axes. Detecting the parallel light by a parallel light adjusting unit disposed opposite to a position where the parallel light branched by the beam is incident, and based on the light detection result. In the pickup assembling method for adjusting the position of the pickup unit, the parallel light adjusting unit is provided with a reflecting plate movably between a passing position and a non-passing position of a reflected light component of the parallel light incident from the beam splitter. The reflective plate is disposed so as to be inclined in a direction to prevent the reflected light component from returning to the beam splitter, and the reflective plate is adjusted by the parallel light adjusting unit provided with the reflective plate. The above object is achieved by moving to the non-passing position and moving to the passing position at the time of adjustment by the other opposing parallel light adjusting unit.

According to the above configuration, the optical system has an optical system similar to or equivalent to the optical component of the optical pickup device, and the optical system reflects the parallel light from the collimating lens and the mirror that serves as a virtual optical information recording medium. The parallel light that has passed through the objective lens is split by a beam splitter in a direction orthogonal to each optical axis by a beam splitter, and is disposed to face the position where the parallel light split by the beam is incident. When the parallel light adjustment unit detects the parallel light and adjusts the position of the pickup unit based on the light detection result, the parallel light adjustment unit passes the reflected light component of the parallel light incident from the beam splitter to the parallel light adjustment unit. And a reflection plate movably provided at the non-passing position, and the reflection plate is disposed so as to be inclined in a direction for preventing return of the reflected light component to the beam splitter, and the reflection plate is disposed. It is moved to the non-passing position at the time of adjustment by the parallel light adjusting unit provided with the reflection plate, and is moved to the passing position at the time of adjustment by the other opposing parallel light adjusting unit. The reflected light component from the parallel light adjusting unit on the other side can be prevented from entering the parallel light adjusting unit, and the adjustment accuracy can be improved, so that it is equivalent to the optical system of the optical pickup device or By achieving an optical system having the same effect, the optical pickup device can be assembled with high accuracy.

According to a second aspect of the present invention, in the optical pickup assembling apparatus, a light emitting element, a light receiving element, and a hologram are integrally formed as a pickup unit, and light emitted from the light emitting element through the hologram is converted into parallel light by a collimating lens. After that, the objective lens irradiates the optical information recording medium through an optical component that condenses and irradiates the optical information recording medium, and the reflected light from the optical information recording medium passes through the hologram of the pickup unit through the optical component. An optical system similar to or equivalent to the optical component of the optical pickup device that records and reproduces information on the optical information recording medium by irradiating the optical receiving device with the light receiving element is provided. The parallel light and the parallel light reflected by the mirror serving as the virtual optical information recording medium and passing through the objective lens are separated. The parallel light is split by a beam splitter in a direction orthogonal to each optical axis, and the parallel light is adjusted by a parallel light adjusting unit disposed opposite to a position where the parallel light split by the beam is incident. In the pickup assembling apparatus that detects and adjusts the position of the pickup unit based on the light detection result, the parallel light adjustment unit includes a passing position and a non-passing position of a reflected light component of the parallel light incident from the beam splitter. A movable reflection plate is provided, and the reflection plate is disposed so as to be inclined in a direction to prevent the reflected light component from returning to the beam splitter, and the reflection plate is provided with the reflection plate. By moving to the non-passing position at the time of adjustment by the parallel light adjusting unit and by moving to the passing position at the time of adjustment by the other opposing parallel light adjusting unit. It has achieved.

According to the above construction, the optical system has an optical system similar to or equivalent to the optical parts of the optical pickup device, and the optical system reflects the parallel light from the collimating lens and the mirror as the virtual optical information recording medium. The parallel light that has passed through the objective lens is split by a beam splitter in a direction orthogonal to each optical axis by a beam splitter, and is disposed to face the position where the parallel light split by the beam is incident. When the parallel light adjustment unit detects the parallel light and adjusts the position of the pickup unit based on the light detection result, the parallel light adjustment unit passes the reflected light component of the parallel light incident from the beam splitter to the parallel light adjustment unit. And a reflection plate movably provided at the non-passing position, and the reflection plate is disposed so as to be inclined in a direction for preventing return of the reflected light component to the beam splitter, and the reflection plate is disposed. It is moved to the non-passing position at the time of adjustment by the parallel light adjusting unit provided with the reflection plate, and is moved to the passing position at the time of adjustment by the other opposing parallel light adjusting unit. The reflected light component from the parallel light adjusting unit on the other side can be prevented from entering the parallel light adjusting unit, and the adjustment accuracy can be improved, so that it is equivalent to the optical system of the optical pickup device or By achieving an optical system having the same effect, the optical pickup device can be assembled with high accuracy.

According to a third aspect of the present invention, there is provided an optical pickup assembling method, wherein a light emitting element, a light receiving element, and a hologram are integrally formed as a pickup unit, and light emitted from the light emitting element through the hologram is converted into parallel light by a collimating lens. After that, the objective lens irradiates the optical information recording medium through an optical component that condenses and irradiates the optical information recording medium, and the reflected light from the optical information recording medium passes through the hologram of the pickup unit through the optical component. An optical system similar to or equivalent to the optical component of the optical pickup device that records and reproduces information on the optical information recording medium by irradiating the optical receiving device with the light receiving element is provided. The parallel light and the parallel light reflected by the mirror serving as the virtual optical information recording medium and passing through the objective lens are separated. The parallel light is split by a beam splitter in a direction orthogonal to each optical axis, and the parallel light is adjusted by a parallel light adjusting unit disposed opposite to a position where the parallel light split by the beam is incident. In a pickup assembling method for detecting and adjusting the position of the pickup unit based on the light detection result, the parallel light adjustment unit is arranged so as to be tiltable in a direction for preventing return of the reflected light component to the beam splitter. The above-mentioned object is attained by providing and tilting at the time of adjustment to prevent the reflected light component from returning to the other parallel light adjusting section opposite to the other.

According to the above configuration, the optical system has an optical system similar to or equivalent to the optical components of the optical pickup device, and the optical system reflects the parallel light from the collimating lens and the mirror as the virtual optical information recording medium. The parallel light that has passed through the objective lens is split by a beam splitter in a direction orthogonal to each optical axis by a beam splitter, and is disposed to face the position where the parallel light split by the beam is incident. When the parallel light adjustment unit detects the parallel light and adjusts the position of the pickup unit based on the light detection result, the parallel light adjustment unit is tilted in a direction to prevent the reflected light component from returning to the beam splitter. It is disposed so as to be tiltable at the time of adjustment, and the reflected light component is prevented from returning to the other parallel light adjusting section opposite to the other. Side It is possible to prevent the reflected light component from the line light adjustment unit from being incident, improve the adjustment accuracy, and achieve an optical system that is equivalent or the same effect as the optical system of the optical pickup device in a pseudo manner, The optical pickup device can be assembled with high accuracy.

According to a fourth aspect of the present invention, in the optical pickup assembling apparatus, the light emitting element, the light receiving element, and the hologram are integrally formed as a pickup unit, and light emitted from the light emitting element through the hologram is converted into parallel light by a collimating lens. After that, the objective lens irradiates the optical information recording medium through an optical component that condenses and irradiates the optical information recording medium, and the reflected light from the optical information recording medium passes through the hologram of the pickup unit through the optical component. An optical system similar to or equivalent to the optical component of the optical pickup device that records and reproduces information on the optical information recording medium by irradiating the optical receiving device with the light receiving element is provided. The parallel light and the parallel light reflected by the mirror serving as the virtual optical information recording medium and passing through the objective lens are separated. The parallel light is split by a beam splitter in a direction orthogonal to each optical axis, and the parallel light is adjusted by a parallel light adjusting unit disposed opposite to a position where the parallel light split by the beam is incident. In a pickup assembling apparatus that detects and adjusts the position of the pickup unit based on the light detection result, the parallel light adjustment unit is arranged to be tiltable in a direction that prevents the reflected light component from returning to the beam splitter. The above-mentioned object is attained by being provided and tilted at the time of adjustment to prevent the reflected light component from returning to the other parallel light adjusting unit facing the other.

According to the above configuration, the optical system has an optical system similar to or equivalent to the optical components of the optical pickup device, and the optical system reflects the parallel light from the collimating lens and the mirror as the virtual optical information recording medium. The parallel light that has passed through the objective lens is split by a beam splitter in a direction orthogonal to each optical axis by a beam splitter, and is disposed to face the position where the parallel light split by the beam is incident. When the parallel light adjustment unit detects the parallel light and adjusts the position of the pickup unit based on the light detection result, the parallel light adjustment unit is tilted in a direction to prevent the reflected light component from returning to the beam splitter. It is disposed so as to be tiltable at the time of adjustment, and the reflected light component is prevented from returning to the other parallel light adjusting section opposite to the other. Side It is possible to prevent the reflected light component from the line light adjustment unit from being incident, improve the adjustment accuracy, and achieve an optical system that is equivalent or the same effect as the optical system of the optical pickup device in a pseudo manner, The optical pickup device can be assembled with high accuracy.

In the case of claim 3 or claim 4, for example, as described in claim 5, the parallel light adjusting section is
Detecting the parallel light by the double knife edge method, on the luminous flux cutting plane of the double knife edge, by rotating about the axis parallel to the cutting line direction, tilt the mechanism of the rotating portion of the double knife edge, The reflected light component may be tilted in a direction that prevents the reflected light component from returning to the beam splitter.

According to the above configuration, the parallel light adjusting section detects parallel light by the double knife edge method, and rotates on the axis parallel to the cutting line direction on the light beam cutting plane of the double knife edge. By tilting the mechanism of the rotating portion of the double knife edge to tilt in the direction that prevents the reflected light component from returning to the beam splitter, if the beam cutting line direction at the double knife edge portion is one direction, The adjustment accuracy of the parallel light adjustment unit can be further improved,
By achieving an optical system that is equivalent to or has the same effect as the optical system of the optical pickup device, the optical pickup device can be assembled with even higher precision.

Further, for example, as described in claim 6, the parallel light adjusting section detects the parallel light by a double knife edge method, and a light beam split by the beam splitter is a collection of double knife edges. Passing a point different from the center of the optical lens, or offset in the radial direction with respect to a straight line connecting the central axis of the condenser lens, tilted in a direction to prevent the reflected light component from returning to the beam splitter. Is also good.

According to the above configuration, the parallel light adjusting section detects the parallel light by the double knife edge method, and determines that the light beam split by the beam splitter is different from the center of the condensing lens of the double knife edge. Since it is tilted in a direction that prevents the reflected light component from returning to the beam splitter by offsetting in the radial direction with respect to the straight line connecting the central axes of the passing or condensing lenses, the adjustment accuracy of the opposing parallel light adjustment unit Can be further improved, and an optical system equivalent to or having the same effect as the optical system of the optical pickup device can be achieved in a pseudo manner, and the optical pickup device can be assembled with higher accuracy.

Further, in the case of the sixth aspect, for example, as described in the seventh aspect, the parallel light adjusting unit is configured to adjust the light beam split by the beam splitter with respect to a light beam cutting line direction of the double knife edge. May pass through a point offset vertically.

According to the above configuration, the parallel light adjusting unit is configured to allow the light beam split by the beam splitter to pass through a point offset in a direction perpendicular to the light beam cutting line direction of the double knife edge. When the direction of the light beam cutting line at the knife edge is one direction, the parallel light adjustment of the direction in which the light amount distribution does not change due to the offset and the light beam cutting line direction is the same, and the center of the light beam and the condenser lens are offset. The adjustment accuracy of the part can be further improved,
By achieving an optical system that is equivalent to or has the same effect as the optical system of the optical pickup device, the optical pickup device can be assembled with even higher precision.

[0032]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. It should be noted that the embodiments described below are preferred embodiments of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention is not limited to the following description. The embodiments are not limited to these embodiments unless otherwise specified.

FIGS. 1 and 2 show a first embodiment of an optical pickup assembling method and a pickup assembling apparatus according to the present invention. FIG. 1 shows an optical pickup assembling method and an optical pickup assembling apparatus according to the present invention. FIG. 1 is a main part configuration diagram of a pickup assembling apparatus 1 to which a first embodiment is applied. The optical pickup assembling apparatus 1 includes a collimator lens 2, a beam splitter 3, an objective lens 4, a half mirror 5, and a parallel light adjusting unit. A double knife edge 6 for a forward pass, a double knife edge 7 for a return pass, and the like are provided.

The outgoing double knife edge 6 and the outgoing double knife edge 7 are provided with condensing lenses 6a and 7a, respectively.
a, rotating units 6b and 7b, and PDs 6c and 7c for detection. The collimating lens 2 and the objective lens 4 can be moved in the focal direction (optical axis direction) indicated by a double arrow in FIG. 1 by a movable mechanism (not shown). It has become. The optical pickup assembling apparatus 1 can achieve an optical system that is equivalent to or has the same effect as the optical system of the optical pickup apparatus in a pseudo manner only by adjusting the parallel light. The half mirror 5 plays the same role as the disk of the pickup device, and is arranged substantially perpendicular to the optical axis because it reflects light at the focal position.

In addition, the double knife edge 6 for the outward path includes
As shown in FIG. 2, the reflecting plate 8 is disposed at a predetermined angle with respect to the optical axis, and the reflecting plate 8 is moved in parallel by a driving mechanism (not shown) as shown by a double arrow in FIG. The movement is adjusted to the light passing position and the light non-passing position so that the reflected light traveling from the outward double knife edge 6 toward the beam splitter 3 does not return to the beam splitter 3.

A pickup unit 10 is set in the pickup assembling apparatus 1.

The pickup unit 10 includes a cell 11
In addition, a light emitting element (LD) 12, a light receiving element (PD) 13, a prism 14, and a hologram (HOE) 15 are assembled and integrated.
Light from the light emitting element 12 is reflected by the prism 14 in the cell 11 in the direction of the hologram 15, and emitted through the hologram 15 toward the collimator lens 2 of the pickup assembling apparatus 1. The optical pickup unit 10 may not include the prism 14 depending on the method of assembling the optical pickup unit.

The pickup assembling apparatus 1 performs assembling adjustment of the set pickup unit 10. The light emitting element 12 and the hologram 15 are connected to the cell 1 as a unit housing.
The optical pickup assembling apparatus 1 adjusts the light receiving element 13 based on the light of the light emitting element 12 in a state where the light receiving element 13 is assembled with respect to the first reference plane.

Next, the operation of the present embodiment will be described. When performing the assembly adjustment of the optical pickup unit 10, the pickup assembling apparatus 1 of the present embodiment sets the optical pickup unit 10 in the optical pickup assembling apparatus 1,
The light is emitted from the light emitting element 12 of the optical pickup unit 10.

Light emitting element 1 of optical pickup unit 10
The light emitted from 2 is reflected by the prism 14 and applied to the collimating lens 2 through the hologram 15,
The collimator lens 2 irradiates the beam splitter 3 with incident light as parallel light.

The beam splitter 3 splits the beam into a main beam and two sub beams, and the optical pickup assembling apparatus 1 focuses the split main beam on a smooth reflecting surface of a reflecting plate 8 by an objective lens 4. The optical pickup assembling apparatus 1 transmits the light reflected by the reflection surface of the reflection plate 8 through the objective lens 4, the beam splitter 3, and the collimator lens 2.
The light is divided into two lights by 5 and is incident on the light receiving element 13.

The beam splitter 3 branches the parallel light from the collimator lens 2 out of the optical path to the reflection plate 8 as a sub-beam, and the forward double knife disposed opposite to the beam splitter 3. The light is sent to the edge 6 and the returning parallel light from the objective lens 4 is sent to the double knife edge 7 for returning. The double knife edge 6 for the forward path and the double knife edge 7 for the return path converge the sub-beams with the condenser lenses 6a, 7a, respectively, and are detected by the detection PDs 6c, 7c through the rotating units 6b, 7b.

However, in the double knife edge 6 for the forward path and the double knife edge 7 for the return path, the rotating portions 6b, 7
b and the reflected light from the surfaces of the detection PDs 6c and 7c enter the detection PDs 6c and 7c as they are in the direction of the beam splitter 3, and further into the double knife edge 7 for the return path and the double knife edge 6 for the forward path which are relatively arranged. Thus, there is a problem that a detection error occurs. In particular,
In the outward double knife edge 6 having a large reflected light component,
Since the detection error due to the reflected light is large, and the parallel light adjustment on the return path is performed after performing the parallel light adjustment on the outward path, it is not necessary that the adjustment light beams enter both double knife edges at the same time. In this embodiment, only the outward double knife edge 6 is provided with the reflection plate 8 for preventing the influence of the reflected light. The reflection plate 8 is provided on the double knife edge 7 for the return path only when the reflected light from the double knife edge 7 for the return path affects the measurement accuracy of the double knife edge 6 for the forward path. I do.

Then, the optical pickup assembling apparatus 1 includes a PD 6c for detecting the double knife edges 6 and 7 in the forward and backward paths.
The position of the light receiving element 13 of the optical pickup unit 10 is sequentially adjusted by measurement at 7c. However, as shown in FIG. 2, the beam is split at the double knife edges 6, 7 where no measurement is performed, as shown in FIG. A reflection plate 8 for changing the direction of reflected light is inserted in the path of the double knife edges 6, 7 to the rotating parts 6b, 7b so that the reflected light does not return to the beam splitter 3 as reflected light.

Therefore, it is possible to improve the adjustment accuracy when adjusting the parallel light with the double knife edges 6 and 7 facing each other.

FIG. 3 is a schematic structural view of a double knife edge 21 for a forward path of a pickup assembling apparatus 20 to which an optical pickup assembling method and a pickup assembling apparatus according to a second embodiment of the present invention are applied.

This embodiment is applied to a pickup assembling apparatus similar to the pickup assembling apparatus 1 of the first embodiment. In the description of the present embodiment, the first embodiment will be described. The same reference numerals are given to the same components as those described above, and the detailed description thereof is omitted.
Parts not shown in the drawings will also be described using the same reference numerals used in the description of the first embodiment as needed.

As shown in FIG.
Means that the double knife edge 21 for the outward path is a condenser lens 21
a, a rotating unit 21b, and a detecting PD 21c. The rotating unit 21b and the detecting PD 21c are driven by a driving mechanism (not shown) in a direction orthogonal to the optical axis and in a direction different from the orthogonal direction as shown in FIG. It is arranged to be tiltable.

The rotation angle between the rotating part 21 and the detecting PD 21c is sufficient that the light from the beam splitter 3 does not enter the detecting PD 21c. Is different before and after the two rotating portions 21b of the outward double knife edge 21, but when the cutting detection direction of the light beam is one direction, the direction of inclining the rotation axis is changed by the forward double knife edge 21. By inclining about an axis parallel to the cutting line direction on the light beam cutting plane, the cutting speed at the knife edge portion in the cutting line direction can be made equal before and after.

Therefore, the reflected light does not return to the direction of the beam splitter 3 as shown in FIG. 3, and the adjustment accuracy by the opposing double knife edge method can be improved.

FIGS. 4 to 6 are schematic diagrams showing the outward double knife edge 31 of the pickup assembling apparatus 30 to which the optical pickup assembling method and the pickup assembling apparatus according to the third embodiment of the present invention are applied.

This embodiment is applied to a pickup assembling apparatus similar to the pickup assembling apparatus 1 of the first embodiment. In the description of the present embodiment, the first embodiment will be described. The same reference numerals are given to the same components as those described above, and the detailed description thereof is omitted.
Parts not shown in the drawings will also be described, if necessary, using the same reference numerals used in the description of the first embodiment.

Referring to FIG.
Is the outgoing double knife edge 31 is a condenser lens 31
a, a rotating unit 31b, and a detecting PD 31c. The condenser lens 31a, the rotating unit 31b, and the detecting PD 3c are provided.
1c is provided so as to be movable by a drive mechanism (not shown) in a direction in which the central axis of the light speed for adjustment is shifted from the central axis of the condenser lens 31a.
Since the light is shifted to the central axis of “a”, the light reflected by the rotating unit 31 b does not return to the beam splitter 3.

In the pickup assembling apparatus 30, the center axis of the condenser lens 31a and the center axis of the rotating part 31b are set in order to make the cutting speed of the light beam of the double knife edge 31 for the forward path and that of the double knife edge 7 for the return path the same. When they are the same, or when they are offset in the normal direction from the straight line connecting the center of the light beam and the central axis of the condenser lens 31a, the reflected light from the detection PD 31c is directed in the direction of the beam splitter 3 as shown by the arrow in FIG. It does not return and the adjustment accuracy can be improved.

The shift amount of the light beam is sufficient if no light enters the detection PD 7c of the double knife edge 7 for the return path, which is the opposing adjustment unit. As a result of the shift, the cutting shape and the light amount distribution of the double knife edges 31 and 7 are slightly different between the forward double knife edge 31 and the return double knife edge 7, but the cut detection direction of the light beam is one. In the case of the direction, as shown in FIG. 5, a point offset in a direction perpendicular to the cutting line direction is set so that the direction of the rotation axis is perpendicular to the cutting line direction on the light beam cutting plane of the double knife edge 31 for the forward path. Thereby, the light amount distribution of the cutting line at the knife edge portion in the cutting line direction can be made the same before and after, so that the parallel light adjustment accuracy can be further improved.

The cutting line direction is the direction of the cutting line when the light beam is cut by the knife edge, as shown in FIG. 6. In FIG. 6, the horizontal direction is defined as the cutting line direction. ing.

Although the invention made by the inventor has been specifically described based on the preferred embodiments, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the invention. It goes without saying that it is possible.

[0058]

According to the optical pickup assembling method according to the first aspect of the present invention, the optical pickup has an optical system similar to or equivalent to the optical component of the optical pickup device, and the optical system includes: The parallel light reflected by the mirror serving as a virtual optical information recording medium and passed through the objective lens is branched by a beam splitter in a direction orthogonal to each optical axis, and the parallel light branched by the beam is incident. When the parallel light adjuster disposed opposite to the position to be detected detects the parallel light and adjusts the position of the pickup unit based on the light detection result, the parallel light adjuster is incident on the parallel light adjuster from the beam splitter. A reflective plate is provided movably at a passing position and a non-passing position of the reflected light component of the parallel light, and the reflecting plate is prevented from returning the reflected light component to the beam splitter. The reflector is moved to the non-passing position at the time of adjustment by the parallel light adjustment unit provided with the reflection plate, and at the time of adjustment by the other parallel light adjustment unit opposed to each other. Moving to the passing position, it is possible to prevent the reflected light component from the parallel light adjusting unit on the other side from being incident on the parallel light adjusting units disposed opposite to each other, thereby improving the adjustment accuracy. As a result, an optical system that is equivalent to or has the same effect as the optical system of the optical pickup device is achieved, and the optical pickup device can be assembled with high accuracy.

According to the second aspect of the present invention, the optical pickup assembling apparatus has an optical system similar to or equivalent to the optical components of the optical pickup apparatus. Parallel light reflected by a mirror serving as an optical information recording medium and passed through an objective lens is branched by a beam splitter in a direction orthogonal to each optical axis by a beam splitter, and the parallel light branched by the beam is incident. When detecting the parallel light by the parallel light adjusting unit disposed opposite to the position and adjusting the position of the pickup unit based on the light detection result, the parallel light adjusting unit is incident on the parallel light adjusting unit from the beam splitter. A method in which a reflecting plate is provided so as to be movable between a passing position and a non-passing position of the reflected light component of the parallel light, and the reflecting plate is configured to prevent the reflected light component from returning to the beam splitter. The reflector is moved to the non-passing position at the time of adjustment by the parallel light adjustment unit provided with the reflection plate, and at the time of adjustment by the other opposing parallel light adjustment unit, Since it is moved to the passing position, it is possible to prevent the reflected light component from the parallel light adjustment unit on the other side from being incident on the parallel light adjustment units disposed opposite to each other, and to improve the adjustment accuracy. Thus, an optical system that is equivalent to or has the same effect as the optical system of the optical pickup device can be achieved, and the optical pickup device can be assembled with high precision.

According to the optical pickup assembling method of the third aspect of the present invention, the optical pickup has an optical system similar to or equivalent to the optical component of the optical pickup device, and the optical system is configured to transmit the parallel light from the collimating lens and the virtual light. Parallel light reflected by a mirror serving as an optical information recording medium and passed through an objective lens is branched by a beam splitter in a direction orthogonal to each optical axis by a beam splitter, and the parallel light branched by the beam is incident. When detecting the parallel light by the parallel light adjusting unit disposed opposite to the position and adjusting the position of the pickup unit based on the result of the light detection, the parallel light adjusting unit includes a reflected light component beam splitter. It is disposed so as to be tiltable in the direction of preventing return to the camera, and is tilted at the time of adjustment to prevent return light of the reflected light component from returning to the other parallel light adjusting unit opposite to the other. It is possible to prevent the reflected light component from the parallel light adjusting unit on the other side from being incident on the provided parallel light adjusting unit, thereby improving the adjustment accuracy and equivalently to the optical system of the optical pickup device in a pseudo manner. Alternatively, an optical system having the same effect can be achieved, and the optical pickup device can be assembled with high accuracy.

According to the fourth aspect of the present invention, the optical pickup assembling apparatus has an optical system similar to or equivalent to the optical components of the optical pickup apparatus. Parallel light reflected by a mirror serving as an optical information recording medium and passed through an objective lens is branched by a beam splitter in a direction orthogonal to each optical axis by a beam splitter, and the parallel light branched by the beam is incident. When detecting the parallel light by the parallel light adjusting unit disposed opposite to the position and adjusting the position of the pickup unit based on the result of the light detection, the parallel light adjusting unit includes a reflected light component beam splitter. It is disposed so as to be tiltable in the direction of preventing return to the camera, and is tilted at the time of adjustment to prevent return light of the reflected light component from returning to the other parallel light adjusting unit opposite to the other. It is possible to prevent the reflected light component from the parallel light adjusting unit on the other side from being incident on the provided parallel light adjusting unit, thereby improving the adjustment accuracy and equivalently to the optical system of the optical pickup device in a pseudo manner. Alternatively, an optical system having the same effect can be achieved, and the optical pickup device can be assembled with high accuracy.

According to the pickup assembling method and the pickup assembling apparatus of the present invention, the parallel light adjusting unit detects the parallel light by the double knife edge method, and the parallel light adjusting unit detects the parallel light on the light beam cutting plane of the double knife edge. By rotating around the axis parallel to the cutting line direction, the mechanism of the rotating portion of the double knife edge is tilted and tilted in the direction that prevents the reflected light component from returning to the beam splitter,
In the case where the direction of the light beam cutting line at the double knife edge portion is one direction, the adjustment accuracy at the parallel light adjusting portion can be further improved, and the optical effect is equivalent to or similar to the optical system of the optical pickup device in a pseudo manner. By achieving the system, the optical pickup device can be assembled with higher accuracy.

According to the pickup assembling method and the pickup assembling apparatus of the present invention, the parallel light adjusting section detects the parallel light by the double knife edge method, and the light beam split by the beam splitter is doubled. The knife edge passes through a point different from the center of the condensing lens of the knife edge, or is tilted in a direction that offsets in the radial direction with respect to the straight line connecting the central axis of the condensing lens to prevent the reflected light component from returning to the beam splitter. Therefore, it is possible to further improve the adjustment accuracy of the opposing parallel light adjustment units, achieve an optical system that is equivalent to or has the same effect as the optical system of the optical pickup device, and achieve even higher precision The pickup device can be assembled.

According to the pickup assembling method and the pickup assembling apparatus according to the present invention, the parallel light adjusting section is provided so that the light beam split by the beam splitter is perpendicular to the light beam cutting line direction of the double knife edge. Since the light passes through the offset point, if the light beam cutting line direction at the double knife edge is one direction, the direction in which the light amount distribution does not change due to the offset and the light beam cutting line direction are the same, and the condensing lens And the adjustment accuracy of the parallel light adjustment unit in which the center of the light beam is offset can be further improved, and an optical system that is equivalent to or has the same effect as the optical system of the optical pickup device can be achieved in a pseudo manner. The optical pickup device can be assembled with high accuracy.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of an optical pickup device to which an optical pickup assembly method and an optical pickup assembly device according to a first embodiment of the present invention are applied.

FIG. 2 is an enlarged schematic front view of a double knife edge portion for an outward path in FIG. 1;

FIG. 3 is a main part configuration diagram of a forward double knife edge portion of an optical pickup device to which an optical pickup assembly method and an optical pickup assembly device according to a second embodiment of the present invention are applied.

FIG. 4 is a main part configuration diagram of a forward double knife edge portion of an optical pickup device to which an optical pickup assembly method and an optical pickup assembly device according to a third embodiment of the present invention are applied.

FIG. 5 is a front view of the rotating unit of FIG. 4;

FIG. 6 is an explanatory diagram of a cutting direction of the double knife edge in FIG. 4;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Pickup assembly device 2 Collimating lens 3 Beam splitter 4 Objective lens 5 Half mirror 6 Double knife edge for forward path 7 Double knife edge for return path 6a, 7a Condensing lens 6b, 7b Rotating section 6c, 7c PD for detecting 8 Reflector plate 10 Pickup Unit 11 cell 12 light emitting element 13 light receiving element 14 prism 15 hologram

Claims (7)

[Claims] 1. A light emitting element, a light receiving element, and a hologram are integrally formed as a pickup unit, and light emitted from the light emitting element through the hologram is converted into parallel light by a collimating lens, and then is converted onto an optical information recording medium by an objective lens. Irradiating the optical information recording medium through an optical component that condenses and irradiates the light, and irradiating the light receiving element by irradiating reflected light from the optical information recording medium through the hologram of the pickup unit through the optical component. The optical pickup device for recording / reproducing information on / from an information recording medium has an optical system similar to or equivalent to the optical component, and the optical system is configured to emit parallel light from a collimating lens and the virtual optical information recording medium. The parallel light reflected by the mirror and passing through the objective lens is The parallel light splitter is detected by a parallel light adjusting unit disposed opposite to a position where the parallel light split by the beam is incident, and the pickup unit is detected based on the light detection result. In the pickup assembling method for adjusting the position, the parallel light adjusting unit is provided with a reflecting plate movably between a passing position and a non-passing position of a reflected light component of the parallel light incident from the beam splitter, and The plate is disposed so as to be inclined in a direction that prevents the reflected light component from returning to the beam splitter,
The reflector is moved to the non-passing position at the time of adjustment by the parallel light adjustment unit provided with the reflection plate, and is moved to the passage position at the time of adjustment by the other opposing parallel light adjustment unit. An optical pickup assembling method. 2. A light-emitting element, a light-receiving element, and a hologram are integrally formed as a pickup unit, and light emitted from the light-emitting element through the hologram is converted into parallel light by a collimator lens, and then is converted onto an optical information recording medium by an objective lens. Irradiating the optical information recording medium through an optical component that condenses and irradiates the light, and irradiating the light receiving element by irradiating reflected light from the optical information recording medium through the hologram of the pickup unit through the optical component. The optical pickup device for recording / reproducing information on / from an information recording medium has an optical system similar to or equivalent to the optical component, and the optical system is configured to emit parallel light from a collimating lens and the virtual optical information recording medium. The parallel light reflected by the mirror and passing through the objective lens is The parallel light splitter is detected by a parallel light adjusting unit disposed opposite to a position where the parallel light split by the beam is incident, and the pickup unit is detected based on the light detection result. In the pickup assembling apparatus for performing the position adjustment, the parallel light adjusting unit is provided with a reflecting plate movably between a passing position and a non-passing position of a reflected light component of the parallel light incident from the beam splitter, and The plate is disposed so as to be inclined in a direction that prevents the reflected light component from returning to the beam splitter,
The reflector is moved to the non-passing position at the time of adjustment by the parallel light adjustment unit provided with the reflection plate, and is moved to the passage position at the time of adjustment by the other opposing parallel light adjustment unit. An optical pickup assembling apparatus characterized in that: 3. A light-emitting element, a light-receiving element, and a hologram are integrally formed as a pickup unit. Light emitted from the light-emitting element through the hologram is collimated by a collimator lens, and is then converted to an optical information recording medium by an objective lens. Irradiating the optical information recording medium through an optical component that condenses and irradiates the light, and irradiating the light receiving element by irradiating reflected light from the optical information recording medium through the hologram of the pickup unit through the optical component. The optical pickup device for recording / reproducing information on / from an information recording medium has an optical system similar to or equivalent to the optical component, and the optical system is configured to emit parallel light from a collimating lens and the virtual optical information recording medium. The parallel light reflected by the mirror and passing through the objective lens is The parallel light splitter is detected by a parallel light adjusting unit disposed opposite to a position where the parallel light split by the beam is incident, and the pickup unit is detected based on the light detection result. In the pickup assembling method for performing the position adjustment, the parallel light adjusting unit is disposed so as to be tiltable in a direction for preventing the reflected light component from returning to the beam splitter, and is tilted at the time of adjustment, so that the reflected light component is tilted. An optical pickup assembling method, wherein the return light to the other parallel light adjusting unit facing the other is blocked. 4. A light-emitting element, a light-receiving element, and a hologram are integrally formed as a pickup unit. Light emitted from the light-emitting element through the hologram is converted into parallel light by a collimator lens, and is then formed on an optical information recording medium by an objective lens. Irradiating the optical information recording medium through an optical component that condenses and irradiates the light, and irradiating the light receiving element by irradiating reflected light from the optical information recording medium through the hologram of the pickup unit through the optical component. The optical pickup device for recording / reproducing information on / from an information recording medium has an optical system similar to or equivalent to the optical component, and the optical system is configured to emit parallel light from a collimating lens and the virtual optical information recording medium. The parallel light reflected by the mirror and passing through the objective lens is The parallel light splitter is detected by a parallel light adjusting unit disposed opposite to a position where the parallel light split by the beam is incident, and the pickup unit is detected based on the light detection result. In the pickup assembling apparatus for performing the position adjustment, the parallel light adjusting section is disposed so as to be tiltable in a direction for preventing the reflected light component from returning to the beam splitter, and is tilted at the time of adjustment to adjust the reflected light component. An optical pickup assembling device for blocking return light to the other one of the parallel light adjusting units. 5. The parallel light adjusting section detects the parallel light by a double knife edge method, and rotates about an axis parallel to a cutting line direction on a light beam cutting plane of the double knife edge, 5. The optical pickup assembling method according to claim 3, wherein the mechanism of the rotating portion of the double knife edge is tilted so as to prevent the reflected light component from returning to the beam splitter. Optical pickup assembly equipment. 6. The parallel light adjusting unit detects the parallel light by a double knife edge method, and the light beam split by the beam splitter passes through a point different from the double knife edge focusing lens center, or 4. The optical pickup according to claim 3, wherein the reflected light component is tilted in a direction in which the reflected light component is prevented from returning to the beam splitter by offsetting in a radial direction with respect to a straight line connecting the central axes of the condenser lenses. An optical pickup assembling apparatus according to claim 4. 7. The parallel light adjusting section, wherein the light beam split by the beam splitter passes through a point offset in a direction perpendicular to a light beam cutting line direction of the double knife edge. An optical pickup assembling method or an optical pickup assembling method according to claim 6.