JPH0629777Y2 - Optical axis adjustment device for optical components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an optical axis adjusting device for an optical component represented by an optical pickup in an optical disc device, a compact disc player, an optical video disc player or the like.

[Conventional technology]

For example, in an optical disc device, information is recorded or reproduced by converging and irradiating a laser beam emitted from a light source such as a semiconductor laser onto an optical disc through a predetermined optical system. In order to perform this recording / reproducing accurately, it is necessary to adjust the optical system so that the optical axis of the laser beam is arranged at a predetermined position.

FIG. 2 shows an example of a mechanism for adjusting the angle of the optical axis. In the figure, 1 is a substrate, and 2 is a mount to which the reflection plate 3 is fixed. The mounting base 2 is rotatable with respect to the substrate 1. By adjusting the rotating position, the emission angle of the laser light reflected by the reflection plate 3 can be adjusted.

FIG. 3 shows an example of a mechanism for adjusting (translating) the height of the optical axis. In the figure, the mounting base 4 to which the prism 5 is fixed is slidable linearly with respect to the substrate 1. By adjusting the sliding position of the mounting base 4, the incident position on the inclined surface of the prism 5 is changed, and the optical axis of the laser light emitted from the prism 5 can be moved in parallel to adjust its height. it can.

[Problems to be solved by the device]

In the optical disk device, it is necessary to adjust the angle and height of the optical axis on each of the surface parallel to the optical disk and the surface perpendicular to the optical disk. As a result, if the angle adjusting mechanism and the height adjusting mechanism are provided separately, the total number becomes four, which complicates the configuration. Also, the independence of the adjustment direction deteriorates, and 2
After the adjustment in one direction is completed, it becomes necessary to make fine adjustment again in each plane, and there is a drawback that the adjustment takes time.

Therefore, some devices limit the adjustment direction to one direction,
In that case, it is necessary to improve the accuracy of the optical component and the mounting component for mounting it.

The present invention has been made in view of such a situation, and it is possible to independently adjust the angle and height of the optical axis in one plane with a simple configuration.

[Means for Solving the Problems]

The optical axis adjusting device for an optical part of the present invention adjusts at least the angle of the optical axis with respect to the substrate, the optical part for emitting light, the unit arranged on the substrate with the optical part built therein. And a first supporting mechanism that supports the unit so as to be displaceable in a direction in which the optical axis and the optical axis move substantially parallel to each other, and the distance between the unit and the substrate is changeable, and at least the angle of the optical axis is adjusted together with the first supporting mechanism. A second support mechanism that supports the unit so as to be displaceable in any direction, and a third support mechanism that supports the unit so that the distance from the substrate is changeable and at least the optical axis moves in parallel with the first support mechanism. And a line connecting the first support mechanism and the second support mechanism is substantially parallel to the optical axis, and a line connecting the first support mechanism and the third support mechanism is substantially perpendicular to the optical axis.

[Action]

For example, an optical component such as a semiconductor laser is attached to the unit. Between the unit and the substrate, for example, a first support mechanism including a fixing pin and second and third screws including a screw.
The support mechanism of is attached. For example, the line connecting the fixing pin and one screw should be parallel to the optical axis, and the line connecting the fixing pin and the other screw should be perpendicular to the optical axis.
Each fixing pin and each screw are arranged. As a result, when one screw is adjusted, the unit is displaced in the direction in which the angle of the optical axis is adjusted with the fixing pin and the other screw as a fulcrum, and the angle of the optical axis in one plane is adjusted. Further, when the other screw is adjusted, the unit is displaced in the direction in which the optical axis moves substantially in parallel with the fixing pin and one screw as a fulcrum, and the height of the optical axis in the same plane is adjusted.

Therefore, with a simple configuration, the angle and height of the optical axis can be adjusted independently within one plane.

〔Example〕

FIG. 1 shows the construction of an optical information recording / reproducing apparatus to which the optical axis adjusting device for optical parts of the present invention is applied. In the figure, reference numeral 11 denotes a substrate such as a chassis, to which a turntable 12 is rotatably attached. Reference numeral 13 is a disk as a recording medium, which is placed on the turntable 12 and rotated. Reference numeral 21 denotes a movable portion inside which a mirror 22 and an objective lens 23 are attached, and outside thereof,
Roller 24 rolling on rail 31 fixed to substrate 11
Is rotatably attached.

Reference numeral 41 denotes a unit, the details of which are shown in FIGS. 4 and 5. 42 is a pin fixed to the unit 41,
Reference numerals 43 and 44 denote screws screwed into the unit 41, and these constitute a support mechanism for the unit 41.
Reference numeral 45 is a screw for fixing the unit 41 on the substrate 11. In the unit 41, for example, as shown in FIG.
A semiconductor laser 71 as a light source, a collimator lens 72 for converting the laser light emitted from the semiconductor laser 71 into parallel light, and the like are incorporated.

As shown in FIG. 5, the pin 42 and the screw 43 are arranged such that the line connecting the pin 42 and the screw 43 is substantially parallel to the optical axis of the laser light emitted from the semiconductor laser 71 and the collimator lens 72. . Further, the screw 44 is arranged so that the line connecting the pin 42 and the screw 44 is substantially perpendicular to the optical axis. Reference numerals 51, 52 and 53 are conical recesses formed on the substrate 11, and the tips of the pins 42 and the screws 43 and 44 are in contact with each other. Reference numeral 61 is a mirror fixed to a mount 62 rotatably supported on the substrate 11.

Then, the laser light emitted from the semiconductor 11 is converted into parallel light by the collimator lens 72 and then enters the mirror 61. The laser light reflected by the mirror 61 is incident on the mirror 22, is reflected there, and is incident on the objective lens 23. The objective lens 23 converges and irradiates the incident laser light onto the disk 13.

At the time of recording information, the semiconductor laser 71 is controlled according to the recorded information, and a signal is recorded on the disk 13. At the time of reproducing information, the reflected light from the disk 13 is detected by a photodetector (not shown).

The movable portion 21 is moved in the disk radial direction by a motor (not shown) or the like. At this time, the roller 24 is guided by the rail 31 to smoothly move the movable portion 21. This movable part 2
By moving 1 in the disk radial direction, it is possible to access an arbitrary track of the disk 13.

When adjusting the optical axis of the laser beam in the plane θ ₂ (FIG. 1) perpendicular to the disk 13, first, the screw 43 is moved forward and backward with respect to the unit 41, and the distance between the unit 41 and the substrate 11 is adjusted. At this time, the unit 41 rotates in the θ ₂₁ direction in FIG. 4 with the contact point between the pin 42 and the recess 51 and the contact point between the screw 44 and the recess 53 as fulcrums.
Thereby, the angle of the optical axis of the laser light in the plane θ ₂ is adjusted.

On the other hand, the screw 44 is advanced and retracted with respect to the unit 41, and the board 1
When the distance from 1 is adjusted, the unit 41 rotates in the θ ₂₂ direction in FIG. 4 with the contact point between the pin 42 and the recess 51 and the contact point between the screw 43 and the recess 52 as the fulcrum. As a result, the optical axis of the laser light can be moved substantially in the plane θ ₂ (the height can be adjusted). Strictly speaking, the unit 41 rotates, but since the adjustment distance is minute, it can be considered that the unit 41 practically moves linearly.

Since the line connecting the screw 43 and the pin 42 and the line connecting the screw 44 and the pin 42 are substantially vertical, the adjustment in one direction hardly affects the adjustment in the other direction.

When these adjustments are completed, the screw 45 is screwed onto the board 11 and the unit 41 is fixed to the board 11.

In order to adjust the angle of the optical axis in the plane θ ₁ (FIG. 1) parallel to the disk 13, the mounting base 62 is rotationally adjusted with respect to the substrate 11. As a result, the angle of the laser light reflected by the mirror 61 changes within θ ₁ .

[Effect of device]

As described above, according to the present invention, the angle and height of the optical axis in one plane can be adjusted independently without complicating the configuration.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an optical information recording / reproducing device to which an optical axis adjusting device for optical parts of the present invention is applied, and FIG. 2 is a perspective view of a conventional optical axis adjusting mechanism. 3 is a perspective view of another conventional optical axis adjusting mechanism, FIG. 4 is a perspective view of the unit of the present invention, FIG. 5 is a plan view of the unit of the present invention, and FIG. 6 is an internal view of the unit of the present invention. It is a perspective view explaining. 1 ... Substrate 2 ... Mounting base 3 ... Reflecting plate 4 ... Mounting base 5 ... Prism 11 ... Substrate 12 ... Turntable 13 ... Disk 21 ... Movable part 22 ... Mirror 23 ... Objective lens 24 ...... Roller 31 ...... Rail 41 ...... Unit 42 ...... Pin 43,44,45 ...... Screw 51,52,53 ...... Concave section 61 ...... Mirror 62 ...... Mounting base 71 ...... Semiconductor laser 72 ...... Collimating lens

Claims (1)

[Scope of utility model registration request] 1. An optical component for emitting light, a unit arranged on a substrate in a state where the optical component is built in, a direction in which the unit is adjusted at least with respect to the substrate, and an angle of an optical axis of the light, A first supporting mechanism that supports the optical axis so as to be displaceable in a direction in which the optical axis is moved in a substantially parallel manner; a unit in which the distance to the substrate is changeable, and a direction in which at least the angle of the optical axis is adjusted with the first supporting mechanism. A second supporting mechanism that supports the unit so as to be displaceable, and a third supporting mechanism that supports the unit so that the distance to the substrate is changeable, and that supports the unit together with the first supporting mechanism in a direction in which at least the optical axis is moved in approximately parallel. An optical component having a line connecting the first supporting mechanism and the second supporting mechanism is substantially parallel to the optical axis, and a line connecting the first supporting mechanism and the third supporting mechanism is substantially perpendicular to the optical axis. Optical axis adjustment device.