JPH11219528A - Method and device for adjusting emission optical axis of optical pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for adjusting the emission optical axis of an optical pickup, wherein there is no possibility of individual difference generated due to the subjective point of views or skills of operators for adjusting work and there are no effects of the machining accuracy or attaching accuracy of an objective lens. SOLUTION: This device for adjusting the emission optical axis of an optical pickup including a collimator lens 2 for converting a light emitted from a laser diode 1 into a parallel light, a mirror 3 for guiding this parallel light in the direction of an optical storage medium and an objective lens 4 for converging the parallel light from the mirror 3 and projecting the same to the optical storage medium is provided with an image pickup device 7 for detecting the intensity distribution image of the light emitted from the objective lens 4, a calculator 9 for calculating the amount of positional shift between the center position of the emitted light and a predetermined specified position from the intensity distribution image detected by the image pickup device 7, and a moving stage 11 for adjusting the attaching position of the laser diode 1 based on the amount of the positional shift.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting an output optical axis of an optical pickup and an apparatus for adjusting an output optical axis. More specifically, the present invention relates to a method for adjusting a laser beam to an optical storage medium such as a magneto-optical disk using an objective lens. The present invention relates to a method for adjusting an output optical axis and a device for adjusting an output optical axis in an optical pickup for focusing.

[0002]

2. Description of the Related Art Conventionally, various optical axis adjustment methods for adjusting the position of an emission optical axis in an optical pickup have been proposed.

FIG. 7 shows a conventional optical axis adjusting device for an optical pickup disclosed in Japanese Patent Application Laid-Open No. Hei 5-234089. The method for adjusting the optical axis position using the optical axis adjusting device of the optical pickup shown in FIG. 7 is as follows.

That is, the laser diode 10 shown in FIG.
The divergent light B1 emitted from the light source 1 is converted into parallel light by a collimating lens 102, the direction of the parallel light transmitted through the beam splitter 103 is changed by a prism mirror 104, and a parallel light spot image is formed on an image sensor 121. The intensity distribution image 131 as shown in FIG.

A line (dotted line shown in FIG. 8) connecting the four ends of the intensity distribution image 131 is defined by a contour line 104 of the prism mirror 104.
a, and the maximum intensity portion 131A is located at the center of the intensity distribution image 131.
The fine movement stage 122 fixing the laser diode 101 is moved in a two-dimensional direction so that the optical axis position is adjusted.

[0006] The optical axis adjusting device of the optical pickup shown in FIG. 7 includes a detection optical system 111. That is, the convergent light from the objective lens 105 is reflected upon a recording pit of a magneto-optical disk (not shown), and is reflected as a reflected light including a polarization component depending on the state of the recording pit. Prism mirror 10
4, the light reaches the beam splitter 103, is reflected by the beam splitter 103, and is incident on the beam splitter 112 constituting the detection optical system 111.

One of the reflected light incident on the beam splitter 112 passes through the beam splitter 112 according to the direction of the polarized light component, is further condensed by the condensing lens 113A, and is incident on the light receiving element 114A. . As a result, a focus signal is obtained by the light receiving element 114A. The other polarization component of the reflected light that has entered the beam splitter 112 is reflected by the beam splitter 1.
The light is reflected by the light receiving element 12, is collected by the condenser lens 113B, and is incident on the light receiving element 114B. As a result, a tracking error signal is obtained by the light receiving element 114B.
In FIG. 7, reference numeral 125 denotes a pickup base.

[0008]

However, according to the above-described optical axis adjustment method, when judging the center of the parallel light from the prism mirror 104, the operator needs to determine the shape of the contour of the intensity distribution image 131. In addition, since the position of the maximum intensity portion 131A is visually adjusted by looking at the intensity distribution image 131 obtained by the imaging device 120, there is a problem that the subject of adjustment and individual differences due to skills may occur. Was.

Further, since the parallel light from the prism mirror 104 is imaged to adjust the center position of the optical axis, the objective lens 1
Due to the minute irregularities on the surface of the objective lens 105 due to the processing accuracy of 05 and the inclination of the mounting position of the objective lens 105, the center of the optical axis obtained from the intensity distribution of the parallel light from the prism mirror 104 and the objective lens 105 There is a problem that the center does not coincide with the center of the optical axis obtained from the intensity distribution of the outgoing light emitted toward the magneto-optical disk medium.

[0010] When the centers of the two optical axes are mismatched as described above, the convergent light emitted from the objective lens 105 to the magneto-optical disk in the optical pickup is displaced, and the information recorded on the optical disk medium by the optical pickup is lost. This leads directly to a decrease in read / write performance, a decrease in focus performance of the optical pickup, and a decrease in track servo performance. For this reason, there is a demand for an optical axis adjustment method that takes into account the influence of the objective lens 105, quantifies the position of the emitted optical axis, and does not show individual differences among operators.

Accordingly, the present invention provides a method for adjusting the output optical axis of an optical pickup which is free from the possibility of individual differences due to the subjectivity and skill of the adjusting operator, and which is not affected by the processing accuracy and mounting accuracy of the objective lens. It is an object of the present invention to provide a method and a device for adjusting an output optical axis.

[0012]

According to a first aspect of the present invention, there is provided a method for adjusting an emission optical axis of an optical pickup, comprising detecting a light flux of light emitted from an objective lens, calculating an intensity center position of the light flux, The mounting position of the laser light source is adjusted so that the calculated intensity center position becomes a predetermined desired position.

According to the present invention, the light flux of the light emitted from the objective lens based on the emission of the laser light source is detected, the intensity center position of the light beam is calculated, and the calculated intensity center position is determined in advance. Since the mounting position of the laser emission source is adjusted so as to be a desired position, it is not affected by the processing accuracy and the mounting accuracy of the objective lens, and the subjective judgment of the operator who makes the adjustment. And the position of the output optical axis can be adjusted accurately and easily.

According to a second aspect of the present invention, there is provided a collimator lens for converting divergent light from a laser emission source into parallel light, a mirror for guiding the parallel light toward the optical storage medium, and condensing the parallel light from the mirror. In the method for adjusting the emission optical axis of an optical pickup including an objective lens that emits light to the optical storage medium, an intensity distribution image of light emitted from the objective lens is detected, and the intensity distribution image is approximated to a predetermined distribution function. The mounting position of the laser emission source is adjusted so that the center position of the emitted light obtained from the approximation result coincides with a predetermined position.

According to the present invention, the intensity distribution image of the light emitted from the objective lens based on the light emission of the laser emission source is detected, and the intensity distribution image is approximated to a predetermined distribution function. Since the mounting position of the laser emission source is adjusted so that the center position of the emitted light coincides with a predetermined position determined in advance, the processing accuracy of the objective lens and the processing accuracy of the objective lens can be improved in the same manner as in the first embodiment. The position of the output optical axis can be adjusted accurately and easily without being affected by the mounting accuracy and without ambiguity due to the subjective judgment of the operator performing the adjustment.

According to a third aspect of the present invention, there is provided a collimator lens for converting divergent light from a laser emission source into parallel light, a mirror for guiding the parallel light toward the optical storage medium, and condensing the parallel light from the mirror. A device for adjusting an emission optical axis of an optical pickup including an objective lens for emitting the light to the optical storage medium, wherein the detection device detects an intensity distribution image of light emitted from the objective lens; Calculating means for calculating the amount of deviation between the center position of the emitted light and a predetermined position based on the intensity distribution image, and adjusting means for adjusting the mounting position of the laser emission source based on the amount of deviation. It is characterized by having.

According to the present invention, the intensity distribution image of the light emitted from the objective lens is detected by the detection means, and the center position of the emission light is determined in advance from the intensity distribution image detected by the detection means by the calculation means. The amount of deviation from the predetermined position is calculated, and the adjustment position adjusts the mounting position of the laser emission source based on the amount of deviation calculated by the calculation means. Adjustment of the output optical axis that can be automatically and accurately adjusted without being affected by the adjustment and without ambiguity due to the subjective judgment of the operator performing the adjustment. The device can be realized.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an apparatus for adjusting an emission optical axis of an optical pickup according to the present invention.

(Embodiment 1) (Configuration) FIG. 1 is a configuration diagram of Embodiment 1 of an apparatus for adjusting an emission optical axis of an optical pickup according to the present invention, and FIG. FIG. 5 is an explanatory diagram showing a light intensity distribution of the spot image with respect to the X axis and the Y axis.

The device for adjusting the output optical axis of the optical pickup shown in FIG. 1 has a configuration in which the following components are added to the optical pickup section.

That is, the optical pickup section shown in FIG. 1 converts a light beam B1 emitted from a laser diode 1 as a laser light source into a parallel light beam B2 traveling in the horizontal direction by a collimating lens 2, and the prism mirror 3 The parallel light flux is converted into a parallel light B directed upward by 90 degrees in FIG.
The parallel light B3 is converted into a convergent light B4 by an objective lens 4 provided above the prism mirror 3. The optical pickup unit is located below the laser diode 1 and is capable of independently moving its lower end surface in a vertical direction and a paper surface direction, and a two-dimensional moving type moving stage 11. And a laser power supply 12 for supplying a current to the power supply. In FIG. 1, reference numeral 13 denotes a pickup base.

Further, the adjusting device for the output optical axis of the optical pickup shown in FIG. 1 is disposed at a position higher than the focal length f of the objective lens 4, and an image formed by the light flux (convergent light) B4 from the objective lens 4 is provided. A screen 5 made of a translucent material and having a square shape having a sufficient area for projecting all the light, and a reflecting surface is disposed obliquely downward at an angle of 45 degrees above the screen 5 and formed on the screen 5. A reflecting mirror 6 for forming an image on an imaging device 7 described later, an imaging device 7 having an incident surface facing the direction of the reflecting mirror 6, and one frame of the image output from the imaging device 7 A one-frame memory 8 for storing information of an electric signal of a luminance level with respect to the position of the two-dimensional image, and a Gaussian (Gaussian) component by numerical calculation based on the information stored in the one-frame memory 8 It is approximated to, and a computer 9 for detecting a Gaussian centered position, and an image display device 10 for displaying quantitative information Gaussian center position calculated by the computer 9.

(Operation) Next, a description will be given of a method of adjusting the output optical axis by the output optical axis adjusting device of the optical pickup according to the first embodiment.

FIG. 3 is a diagram showing a one-dimensional intensity distribution on the X-axis of the spot image and a light intensity distribution approximated to Gaussian in the first embodiment. FIG. 4 is a diagram illustrating a state in which the position information of the output optical axis is displayed on the image display device 10.

First, the laser diode 1 shown in FIG.
A collimator lens 2 located in front of the prism mirror 3, a prism mirror 3 located in front of the collimator lens 2 and having a reflection surface inclined at an angle of 45 ° with respect to a horizontal plane, and an objective positioned perpendicular to the horizontal plane where the prism mirror 3 is located. In the optical pickup including the lens 4, a current is supplied from the laser power supply 13 to the laser diode 1 so that the laser diode 1 emits light.

Light beam B emitted from laser diode 1
Reference numeral 1 denotes a prism mirror 3 which is converted into a parallel light flux B2 by a collimating lens 2 disposed in front of a laser diode 1 and is positioned in front of the collimator lens 2 and whose reflection surface is inclined at an upper angle of 45 degrees.
This converts the direction of the parallel light beam B2 into a parallel light beam B3 traveling upward. The parallel light beam B3 has an incident surface in the traveling direction of the parallel light beam B3, and the parallel light beam B3 is incident on the objective lens 4 located 45 degrees above the reflection surface from the prism mirror 3, and at the position of the focal length f of the objective lens 4 The light is converted into a light beam B4 that converges at one point.

This light beam B4 is formed as a spot image on a semi-transparent screen 5 which is vertically above the focal length f, and which is arranged so as to have a plane perpendicular to the traveling direction of the light beam B4. Projected. The projected spot image becomes a bell-shaped image 21 as shown in FIG.
The light beam B5 of the image 21 is above the projection surface of the screen 5, and the reflection mirror 6 whose reflection surface is inclined at an angle of 45 degrees with respect to the surface of the screen 5.
Is reflected as a horizontal light flux B6 and forms an image on the imaging surface of the imaging device 7 arranged so that the incident surface is vertical.

The image pickup device 7 converts the information on the magnitude of the luminance with respect to the two-dimensional position of the light beam B6 of the incident spot image for one frame into an electric signal E1, and converts the electric signal E1.
1 is output to the one-frame memory 8 and stored. The information of the spot image stored in the one-frame memory 8 is stored in a computer 9.
, And performs an approximate calculation process using a Gaussian distribution by the least squares method.

The one-dimensional position distribution of the luminance signal output from the imaging device 7 with respect to the X-axis is as shown by a curve 22 in FIG. 3 when the horizontal axis represents the position in the X-axis direction and the vertical axis represents the light intensity. The light intensity distribution becomes complicated with respect to the position in the X-axis direction.

The light intensity distribution after approximating the light intensity distribution shown by the curve 22 to the Gaussian distribution by the least square method by the computer 9 has a bell shape as shown by a curve 23 in FIG. The position 23A obtained by quantitatively calculating the maximum position of the curve 23 is determined as the center position of the light beam B4 emitted from the objective lens 4. Then, this information is converted from the computer 9 to the screen display device 10 as quantitative numerical information.
At the position indicated by the light intensity center position P2 shown in FIG.

The two-dimensional geometric outline center position P1 output from the imaging device 7 is preset in the imaging device 7 so as to be at the center position of the shape of the objective lens 4. Information on the position P1 is also quantitatively displayed on the screen display device 10.

An operator adjusts the position of the emission optical axis by moving the laser diode 1 with the two-dimensional moving stage 11 so that the light intensity center position P2 of the emission optical axis coincides with the outer shape center position P1. I do.

(Effect) According to the adjusting method of the first embodiment, the center of the emitted light is quantitatively determined from the intensity distribution of the spot image by the light emitted from the objective lens 4 by the optical pickup by using an approximation of a Gaussian distribution. Is calculated as
As in the prior art, the operator observes the spot image, obtains the center position of the emitted light by qualitative judgment, without causing individual differences in the adjustment result by the subjective subjectiveness of the worker to adjust, high accuracy, In addition, the position of the output optical axis can be easily adjusted.

Further, since the center of the optical axis is observed from the intensity distribution of the light emitted from the objective lens 4 belonging to the actual optical pickup, the effect of the displacement of the emitted light due to the variation of the characteristics and the mounting accuracy of the objective lens 4 is eliminated. The position of the output optical axis can be adjusted in consideration of the above. As a result, it is possible to prevent the read / write performance of the optical pickup from reading and writing on the optical recording medium due to the displacement of the emission optical axis.

(Embodiment 2) (Structure) FIG. 5 is a diagram showing the structure of Embodiment 2 of a device for adjusting the emission optical axis of an optical pickup according to the present invention, and the same components as those in Embodiment 1 are the same. The reference numerals are used, and the repeated description is omitted.

In the second embodiment, the first embodiment
In addition to the configuration described above, a one-dimensional moving stage 20 for vertically moving the screen 5 in the vertical direction is arranged. The moving stage 20 can change the position of the screen 5 in the height direction from the objective lens 4 into two stages of H1 and H2.

(Operation) According to the output optical axis adjusting device of the second embodiment, the screen 5 is arranged at the position H1, and the laser diode 1 emits light in the same manner as in the first embodiment.
The light beam B4 emitted from the objective lens 4 is projected onto the screen 5, an image shown on the screen 5 is captured by the imaging device 7, the light intensity distribution is obtained, and the light intensity distribution is approximated to the Gaussian distribution to obtain the center position of the Gaussian distribution. , The center position of the emitted light is calculated.

In this state, the center position of the emitted light is adjusted so as to match the geometric center position of the image. Next, the distance from the objective lens 4 to the screen 5 is moved to a position H2 that is farther from the position H1, and the light beam emitted from the objective lens 4 is projected onto the screen 5A. Adjust the optical axis center position with.

(Effect) According to the output optical axis adjusting device of the second embodiment, in addition to the effect exhibited by the output optical axis adjusting device of the first embodiment, the position at which the spot image is projected can be set to H.
By setting the two stages of H1 and H2, in addition to adjusting the position of the emission optical axis first performed at the position of H1, the distance between the screen 5 and the objective lens 4 is further increased, and the spot image mapped on the screen 5 is enlarged. In addition, the position resolution of the center of the optical axis to be calculated can be increased, whereby the optical axis adjustment can be performed separately for the coarse adjustment and the fine adjustment, and the adjustment position accuracy can be further improved.

(Embodiment 3) (Structure) FIG. 6 is a diagram showing the structure of Embodiment 3 of the adjusting device for the outgoing optical axis of the optical pickup according to the present invention. Is omitted.

In the third embodiment shown in FIG. 6, in addition to the structure of the first embodiment, a moving stage 11 for moving and fixing the laser diode 1 is provided.
1. The stepping motor driver 32 is configured to be driven using a stepping motor driver 32, and based on the calculation result of the computer 9, the stepping motor driver 32
1 is controlled so that the moving stage 11 is automatically moved to adjust the optical axis position.

(Operation) The adjustment method of the output optical axis adjusting device according to the third embodiment is the same as in the first embodiment, in which the center position of the light emitted from the objective lens 4 and the geometric center position of the spot image are used. Is calculated by the computer 9, and the information of the calculation result is used as the amount of movement of the moving stage 11 on which the laser diode 1 is disposed, and the computer 9 calculates the pulse amount of the stepping motor 31 from this amount of movement,
A pulse signal is transmitted to the stepping motor driver 32.

The stepping motor driver 32 supplies a pulse current to the stepping motor 31 based on the pulse signal, and drives the moving stage 11. After moving the moving stage 11, the center position of the emitted light is measured again in the same manner as in the first embodiment, and it is confirmed that the geometric center position matches the center of the emitted light, and then the adjustment is completed. .

(Effects) As described above, according to the output optical axis adjusting device of the third embodiment, in addition to the effects of the output optical axis adjusting device of the first embodiment, the fixed position of the laser diode 1 Adjustment is performed quantitatively and automatically, so that there is no ambiguity of adjustment due to the subjective judgment of the adjustment position by the operator, and it is easy, accurate, and short time by automatic adjustment. The outgoing optical axis can be adjusted.

According to the present invention, the following configuration can be added. (1) A collimating lens that converts divergent light from a laser into parallel light, a mirror that guides the parallel light toward the optical recording medium, and an optical axis of the parallel light from the mirror coincides with the optical axis center of the objective lens. In the method of adjusting the position of the output optical axis of the optical pickup constituted by the objective lens adjusted to the position, the light intensity distribution image of the output light from the objective lens is detected over the entire area, and the light intensity distribution is converted into a predetermined distribution function. The emission position of the optical pickup, wherein the position of the laser diode is adjusted so that the predetermined center position calculated from the approximation coincides with the predetermined position that is the true emission optical axis center position. Shaft adjustment device.

(2) In the supplementary note 1, the center position calculated by approximating the light intensity distribution of the outgoing light emitted from the objective lens is displayed on an image display device. Adjustment device.

According to the constitutions (1) and (2), the position of the optical axis emitted from the objective lens in the optical pickup is approximated by the light intensity distribution of the spot image by a predetermined distribution function.
By calculating the center position of the emitted light from this approximation and quantitatively displaying the amount of deviation from the position of the adjustment target on the image display device, ambiguity due to the subjective judgment of the operator performing the adjustment is eliminated, and the accuracy is reduced. The position of the output optical axis can be adjusted well and easily.

Further, by calculating the center position of the outgoing light from the spot image of the outgoing light from the objective lens, adjustment is made including the influence of the center position of the outgoing light due to the variation in the processing accuracy of the objective lens by the actual optical pickup. It is possible to

(3) In (1), a deviation between the center position calculated by approximating the light intensity distribution of the light emitted from the objective lens and the true position is detected, and the calculated center position is calculated. A device for adjusting an output optical axis of an optical pickup, wherein the output optical axis center position is automatically matched with the output optical axis.

According to the configuration of Appendix (3), in addition to the same effect as in the configuration of Appendix (1), the center position of the light emitted from the objective lens is automatically adjusted. The adjustment can be completed in a short time without any risk of occurrence of individual differences in the adjustment result depending on the skill level of the worker.

(4) The light flux of the light emitted from the objective lens is detected, the center position of the light intensity of this light beam is calculated, and the calculated center position of the light intensity is set to a predetermined desired position. A method for adjusting an emission optical axis of an optical pickup, comprising adjusting an attachment position of a laser diode.

(5) The predetermined desired position is:
(4) The method of (4) above, which is on the optical axis passing through the center of the objective lens.

According to the constructions of the supplementary notes (4) and (5), the processing accuracy and the mounting accuracy of the objective lens are not affected, and there is no ambiguity due to the subjective judgment of the operator who makes the adjustment. It is possible to provide an adjustment method capable of adjusting the position of the output optical axis accurately and easily so as to be on the optical axis passing through the center of the objective lens.

(6) A collimator lens for converting the divergent light from the laser diode into parallel light, a mirror for guiding the parallel light toward the optical recording medium, and condensing the parallel light from the mirror to store the optical data. A device for adjusting an emission optical axis of an optical pickup including an objective lens for emitting light to a medium, comprising: a screen for projecting light emitted from the objective lens; and driving means for driving the screen in the optical axis direction of the emitted light. Detecting means for detecting a light intensity distribution image of the outgoing light projected on the screen; and a predetermined position predetermined as a center position of the outgoing light from the light intensity distribution image detected by the detecting means. And an adjusting means for adjusting the mounting position of the laser diode based on the shift amount. The axis of the adjusting device. According to such an adjusting device, the size of the emitted light (spot image) projected on the screen can be arbitrarily changed. For example, the adjustment of the optical pickup can be accurately performed in two stages of coarse adjustment and fine adjustment. It is possible to make adjustments.

[0055]

According to the first aspect of the present invention, there is no influence on the processing accuracy and the mounting accuracy of the objective lens, and there is no ambiguity due to the subjective judgment of the operator performing the adjustment, and the accuracy is improved. Further, it is possible to provide a method of adjusting the output optical axis of the optical pickup, which can easily adjust the position of the output optical axis.

According to the second aspect of the present invention, similarly to the first aspect of the present invention, there is no influence on the processing accuracy and the mounting accuracy of the objective lens, and it is based on the subjective judgment of the operator who makes the adjustment. It is possible to provide a method of adjusting the emission optical axis of the optical pickup, which can adjust the position of the emission optical axis easily, without ambiguity, with high accuracy.

According to the third aspect of the invention, the processing accuracy and the mounting accuracy of the objective lens are not affected.
In addition, it is possible to realize an output optical axis adjustment device that can automatically and automatically adjust the position of the output optical axis without ambiguity due to the subjective judgment of the operator who makes the adjustment.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a device for adjusting a position of an emission optical axis of an optical pickup according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a state of a light intensity distribution image of an emitted light with respect to an X axis and a Y axis in the first embodiment.

FIG. 3 is a diagram showing a one-dimensional light intensity distribution on the X-axis of the emitted light and a light intensity distribution approximated by a Gaussian distribution in the first embodiment.

FIG. 4 is a conceptual diagram of an adjustment method showing a light intensity center position and an outer shape center position of emitted light according to the first embodiment.

FIG. 5 is a diagram showing a configuration of a device for adjusting a position of an emission optical axis of an optical pickup according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a device for adjusting a position of an emission optical axis of an optical pickup according to a third embodiment of the present invention.

FIG. 7 is a configuration diagram showing a method for adjusting the position of an emission optical axis of a conventional optical pickup.

FIG. 8 is an explanatory diagram for adjusting an optical axis position from a light intensity distribution in a conventional method for adjusting the position of an emission optical axis of an optical pickup.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laser diode 2 Collimator lens 3 Prism mirror 4 Objective lens 5 Screen 6 Reflection mirror 7 Imaging device 8 1 Frame memory 9 Computer 10 Image display device 11 Moving stage 12 Laser power supply 20 Moving stage 31 Stepping motor 32 Stepping motor driver

Claims (3)

[Claims] 1. A laser light source for detecting a light beam of light emitted from an objective lens, calculating an intensity center position of the light beam, and setting the calculated intensity center position to a predetermined desired position. Adjusting the mounting position of the optical pickup. 2. A collimator lens for converting divergent light from a laser light source into parallel light, a mirror for guiding the parallel light toward the optical storage medium, and collecting the parallel light from the mirror to collect the parallel light from the optical storage medium. In the method for adjusting the emission optical axis of an optical pickup including an objective lens that emits light, an intensity distribution image of light emitted from the objective lens is detected, and the intensity distribution image is approximated to a predetermined distribution function. A method for adjusting an emission optical axis of an optical pickup, comprising: adjusting a mounting position of the laser emission source such that a center position of the obtained emission light coincides with a predetermined position. 3. A collimator lens for converting divergent light from a laser light source into parallel light, a mirror for guiding the parallel light toward the optical storage medium, and collecting the parallel light from the mirror to collect the optical storage medium. A device for adjusting an emission optical axis of an optical pickup including an objective lens that emits light to an object, comprising: detection means for detecting an intensity distribution image of light emitted from the objective lens; and an intensity distribution image detected by the detection means. Calculating means for calculating a shift amount between a center position of the emitted light and a predetermined position, and adjusting means for adjusting a mounting position of the laser emission source based on the shift amount. An adjusting device for the output optical axis of the optical pickup.