JPH10199015A - Optical head mounting apparatus, mounting method, and optical head - Google Patents

Abstract

(57) Abstract: An optical head mounting apparatus, an optical head mounting method, and an optical head are provided. The inclination between the coordinate axis of the stage and the coordinate axis of the detection means is measured and stored, and positioning is performed while performing coordinate conversion. An object of the present invention is to make it possible to detect a light emitting point in a non-light emitting state of the light emitting means. SOLUTION: Detecting means 38 capable of detecting the positions of a light emitting means 12 and a light receiving means 14 supported on a first stage 32 and an optical element 16 supported on a second stage 34; A coordinate conversion module 52 for obtaining and storing the inclination between the coordinate axis of the second stage and the coordinate axis between the detecting means, the position of the light emitting means 12 and the light receiving means 14 detected by the detecting means and the optical element Control means for converting the 16 positions according to the coordinate conversion module 52 to control the first stage 32 and the second stage 34 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical head mounting apparatus, an optical head mounting method, and an optical head.

[0002]

2. Description of the Related Art In recent years, the speeding up of computer systems,
With the rapid increase in the data amount, the role of the auxiliary storage device is required to be capable of high-speed, large-capacity recording and reproduction. For this reason, the demand for optical information recording / reproducing devices such as CD-ROMs and optical disks has been increasing year by year, and it is expected that in the future, cheaper, smaller and larger capacity models will be transferred. The development of higher density recording media and shorter wavelengths of light emitting lasers have been developed, but in order to achieve downsizing of the entire apparatus, it is essential to develop highly reliable and small optical heads.

As shown in FIG. 10, for example, an optical head 10 for an optical disk includes a laser diode 12 for irradiating a reflective medium such as an optical disk with light, a photodiode 14 for receiving light reflected by a reflective medium such as an optical disk, and the like. A hologram 16 for guiding the reflected light to the photodiode. Such an optical head can be made very small, for example, formed in a size of several mm to several tens of mm. The laser diode 12 and the photodiode 14 are fixed to the stem 18, and the cap 20 is put on the stem 18. The cap 20 has an opening 22, and the hologram 16 is mounted on the surface of the cap 20. For example, as shown in FIG. 11, the hologram 16 is positioned slightly above the surface of the cap 20;
It is fixed to the cap 20 by the adhesive 24. Light can pass through the opening 22 of the cap 20 and the hologram 16.

As shown in FIG. 12, the laser diode 12 is positioned so as to be located at the center of the hologram 16, and at this time, the photodiode 14 is
(Represented by 26). In assembling or mounting the optical head 10, the hologram 16 is positioned at a predetermined position with respect to the laser diode 12 and the photodiode 14 while the laser diode 12 and the photodiode 14 are housed in the stem 18 and the cap 20.

However, the laser diode 12 and the photodiode 14 are formed very small from the demand for obtaining a small optical head 10 (for example, the length of the laser diode 12 is about 500 μm, and the length of the photodiode 14 is about 1000 μm). In order to position the hologram 16 with respect to the laser diode 12 and the photodiode 14, a mounting device 30 as shown in FIG. 13 is used.

[0006] In FIG. 13, the mounting device 30 includes a first stage 32 that supports the laser diode 12 and the photodiode 14, a second stage 34 that supports the hologram 16, and a CCD camera 38. First stage 32 includes an X stage 32a and a Y stage 32b. The second stage 34 includes an X stage 34a and a Y stage
Stage 34b, Z stage 34c, θ stage 3
4d. The hologram 16 is mounted on a holding arm 36.

The hologram 16 is located above the laser diode 12 and the photodiode 14, and has a CCD camera 38.
Is above the hologram 16. Further, an ND filter 40 is arranged between the hologram 16 and the CCD camera 38. The CCD camera 38 is connected to a computer 44 via an image processing device 42, and the computer 44 controls the first stage 32 and the second stage 34 via a controller 46. Further, a laser oscillator 48 is provided as a part of the mounting device 30.

[0008]

At the time of mounting, the laser diode 12 is caused to emit light by the laser oscillator 48.
The CCD camera 38 detects the light emitting point of the laser diode 12 in a state where the light of the laser diode 12 is weakened by the ND filter 40. Therefore, in the conventional mounting device 30, the laser oscillator 48 is required, and the cost of the device increases. Further, because of the presence of the ND filter 40, the CCD camera 38 cannot detect and recognize the details of the laser diode 12 and the photodiode 14, for example, the laser diode 12 and the photodiode 14
Cannot detect a small positional deviation between the two.

Further, the CCD camera 38 has its own X and Y coordinate axes. The first and second stages 32 and 34 also have X and Y coordinate axes. However, if the X and Y coordinate axes of the first and second stages 32 and 34 do not match the X and Y coordinate axes of the CCD camera 38, for example, the first stage 32 is moved in the X axis direction of the CCD camera 38. If it is desired to move the first stage 32 in its own X-axis direction, the first stage 32 does not move in the desired direction.

Therefore, conventionally, the X and Y coordinate axes of the first and second stages 32 and 34 are X and Y of the CCD camera 38, respectively.
If the coordinate axes do not coincide with the Y coordinate axes, the X and Y coordinate axes of the first and second stages 32 and 34 are manually set by CCD.
Adjustments were made to match the X and Y coordinate axes of the camera 38. However, this method takes a considerable amount of time and does not always make a satisfactory adjustment. In addition, if the first stage 32 slightly moves during the adjustment, the adjustment must be performed again from the beginning.

An object of the present invention is to measure and store even if there is an inclination between the coordinate axis of the stage and the coordinate axis of the detecting means, and perform positioning while performing coordinate transformation. It is an object of the present invention to provide an optical head mounting device, a mounting method, and an optical head. Another object of the present invention is to provide an optical head mounting apparatus, an optical head mounting method, and an optical head capable of performing positioning while detecting the positions of a light emitting unit and a light receiving unit in a non-light emitting state of the light emitting unit. It is.

[0012]

An optical head mounting apparatus according to the present invention includes a light emitting means, a light receiving means, and an optical element. Light emitted from the light emitting means is reflected by a reflection medium and passes through the optical element. An optical head mounting device adapted to be incident on a light receiving means, wherein the first stage supports a light emitting means and a light receiving means, a second stage supports an optical element, and is supported by the first stage. A light emitting unit, a light receiving unit, and a detecting unit capable of detecting a position of an optical element supported by the second stage; a tilt between a coordinate axis of the first stage and a coordinate axis between the detecting unit; A coordinate conversion module for determining and storing an inclination between a coordinate axis of the second stage and a coordinate axis between the detection means, and a light emitting means supported by the first stage and detected by the detection means And control means for controlling the first stage and the second stage by converting the position of the light receiving means and the position of the optical element supported by the second stage according to the coordinate conversion module. It is a feature.

A method for mounting an optical head according to the present invention includes a light emitting means, a light receiving means, and an optical element, so that light emitted from the light emitting means is reflected by a reflection medium and enters the light receiving means via the optical element. A tilt between each coordinate axis of each of the first and second stages and a coordinate axis of the detecting means, and storing the determined tilt;
The position of the light emitting means and the light receiving means supported by the first stage is detected by the detecting means, and the position of the optical element supported by the second stage is detected by the detecting means. Converting the positions of the light emitting means and the light receiving means supported by the first stage and the position of the optical element supported by the second stage in accordance with the stored tilt, and converting the positions of the first stage and the second Is controlled.

In the above optical head mounting apparatus and method, the inclination between the coordinate axis of the stage and the coordinate axis of the detection means is detected and stored in advance, and the light emitting means, the light receiving means, the optical element and Can be relatively positioned. Preferably, in the method of mounting the optical head, the step of determining an inclination between each coordinate axis of the first and second stages and the coordinate axis of the detection unit is provided in each of the first and second stages. The light emitting means, the light receiving means, and the index provided on the optical element, which are provided or supported on the stage, are obtained from the coordinates of two positions when the index is moved within the field of view of the detecting means.

[0015] The method may further include a step of determining an inclination between each coordinate axis of the first and second stages and one of the light emitting means, the light receiving means, and the optical element supported by the stage. The step of determining the inclination between each of the coordinate axes of the first and second stages and one of the light emitting means, the light receiving means, and the optical element supported by the stage includes the steps of: It is obtained by detecting each of the two provided indices in different fields of view of the detecting means.

The inclination between the coordinate axes of each of the first and second stages and the coordinate axis of the detecting means,
A light emitting means supported by the first and second stages, a light receiving means, a light receiving means, a light receiving means, a light receiving means, a light receiving means, a light receiving means, and a light receiving means. Determining a tilt between one of the means and the optical element and a coordinate axis of the detecting means.

Preferably, the light emitting means comprises a laser diode, the light receiving means comprises a photodiode, the optical element comprises a hologram, and the detecting means comprises a CCD camera. The laser diode has a detection unit for detecting the position of the light emitting point in a non-light emitting state, and by detecting the light emitting point of the laser diode, the relative position between the photodiode and the hologram can be corrected.

Further, the present invention comprises a light emitting means, a light receiving means, and an optical element, wherein light emitted from the light emitting means is reflected by a reflection medium and enters the light receiving means via the optical element. In the optical head, each of the light receiving means and the optical element is at least two light sources arranged at a predetermined interval.
An optical head having two position detection indices is provided. This optical head can be used in the above-described optical head mounting apparatus and method.

Further, the light emitting means has a detecting section for detecting the position of the light emitting point in a non-light emitting state. Preferably,
The detecting section for detecting the position of the light emitting point in the non-light emitting state includes two concave portions provided along one side of the light emitting means.

[0020]

FIG. 1 is a view showing an optical head mounting apparatus and method according to an embodiment of the present invention. The optical head can be substantially the same as the optical head 10 for an optical disk described with reference to FIG. That is, the optical head 10 is a laser diode (light emitting unit)
12, a photodiode (light receiving means) 14, and a hologram (optical element) 16. The laser diode 12 and the photodiode 14 are fixed to a stem 18,
A cap 20 is placed over stem 18. The hologram 16 is, for example, as shown in FIG.
Should be attached to the surface of the The dimensions of the stem 18 of such an optical head are, for example, several mm to several tens of mm.
It is. The length of the laser diode 12 is, for example, 500
μm, the length of the photodiode 14 is, for example, 1000 μm
It is. The optical head includes other members such as a collimator lens and an objective lens.

In this embodiment, as shown in FIG. 2, the laser diode 12 emits no light and emits light at a light emitting point 12L.
Has a detecting unit for detecting the position of the. The detection unit includes two concave portions 12 b and 12 c provided along one side 12 a of the laser diode 12. Depending on the design at the time of manufacturing the laser diode 12, the laser diode 12
The light emitting point 12L is located between the two concave portions 12b and 12c. The displacement of the light emitting point 12L from the one side 12a of the laser diode 12 to the right in FIG. 2 is very small and the displacement is known.
By detecting b and 12c, the position of the light emitting point 12L can be known. These concave portions 12b and 12c are formed in an arc shape when viewed from the upper surface side of the laser diode 12, and when formed in an arc shape, the concave portions 12b and 12c are formed.
Edge can be recognized well.

Further, as shown in FIG. 3, the photodiode 14 has two position detecting indices 14a and 14b arranged at a predetermined interval L (for example, 900 μm). Similarly, as shown in FIG.
Also two position detection indices 16 arranged at a predetermined interval.
a and 16b. These position detection indices 14a,
14b, 16a and 16b are used to detect the position of the photodiode 14 and the hologram 16 and the angle therebetween.

As shown in FIG. 1, the mounting device 50 of this embodiment is different from the ND filter 4 of the mounting device 30 shown in FIG.
The configuration is substantially similar to that of the mounting apparatus 30 shown in FIG. 13 except that there is no 0 and a laser oscillator 48 and a coordinate conversion module 52 is added. That is, the mounting device 50 includes the first stage 32 supporting the laser diode 12 and the photodiode 14 and the hologram 1
A second stage 34 for supporting the CCD 6 and a CCD camera 38
Consists of The first stage 32 is an X stage 32a
And a Y stage 32b. The second stage 34 is
An X stage 34a, a Y stage 34b, a Z stage 34c, and a θ stage 34d are included. Hologram 16
Is attached to the gripping arm 36. Hologram 1
6 is above the laser diode 12 and the photodiode 14, and the CCD camera 38 is above the hologram 16. The CCD camera 38 is connected to a computer 44 via an image processing device 42 and a coordinate conversion module 52, and the computer 44 is connected to a first computer via a controller 46.
Stage 32 and the second stage 34 are controlled. Note that the image processing device 42 and the coordinate conversion module 52 may be configured as a part of the function of the computer 44.

Hereinafter, the coordinate conversion module 52 will be described. FIG. 4 shows a field of view 38F of the CCD camera 38, and a part of the first stage 32 is present in the field of view 38F. The first stage 32 has an index 32a. CCD camera 38 has a ^C X, coordinate axis ^C Y itself. The first stage 32 also has a coordinate axis of ^S X, ^S Y. The same applies to the second stage 34. Here, the upper left subscripts C and S are for identifying the camera and the stage. ^S X of the first stage 32, ^S Y
Coordinate axis is inclined with respect to ^C X, coordinate axes ^C Y of the CCD camera 38.

In FIG. 5, the first stage 32 is connected to its ^S X
The indicator 32a is moved in the direction of the coordinate axis so that the CCD camera 38
Two positions A (X _1a ,
Y _1a ) and B (X ₁ b, Y ₁ b) are detected as coordinates of the CCD camera 38. ^S X coordinate axis and the CC of the first stage 32
Inclination [delta] _SX between ^C X coordinate axis D camera 38 is calculated by the following formula (1). _{^{δ SX = tan -1 {(c}} Y 1b - c Y 1a) / (C X 1b - C X 1a)} (1) Then, as shown in FIG. 6, the first stage 32 that ^S Y By moving in the direction of the coordinate axis, two positions C (X ₁ c,
Y ₁ c) and D (X ₁ d, Y ₁ d) are detected as coordinates of the CCD camera 38. ^S Y coordinate axis CC of the first stage 32
Inclination [delta] _SY between ^C Y coordinate axes of D camera 38 is calculated by the following equation (2). (Δ _SX and δ _SY should be basically equal when using an orthogonal stage). _{^{δ SY = tan -1 {(C}} X 1d - C X 1c) / (c Y 1d - c Y 1c)} (2) is performed for the second stage 34 a similar process, the second
^C X of ^S X coordinate axis and the CCD camera 38 of the stage 34
The inclination δ _SX with respect to the coordinate axis, and the ^{S of} the second stage 34
Determining the inclination [delta] _SY between the Y coordinate axis and ^C Y coordinate axis of the CCD camera 38. First stage 32 determined in this way
And δ _SX , δ _SY for the second stage 34 are stored as a coordinate transformation module 52.

Then, the laser diode 12 and the photodiode 14 are mounted on the first stage 32, and the hologram 16 is mounted on the second stage 34. CCD
The photodiode 14 and the hologram 1 by the camera 38
6, the image processing device 42 detects the respective indices 14a, 14b, 16a, 16b and the direction of the line segment between the two indices.

[0027] Therefore, as shown in Figure 7, between ^S X coordinate axis and the hologram 16 of the inclination theta _0, and the second stage 34 between ^S X coordinate axis and the photodiode 14 of the first stage 32 Obtain the slope θ ₀ . Again, the first
It explained inclination theta ₀ between ^S X coordinate axis and the photodiode 14 of the stage 32. This description is also applicable to the hologram 16 of the second stage 34.

If the field of view 38F of the CCD camera 38 is sufficiently large with respect to the predetermined distance L, the CCD camera 38
Since the two indices 14a and 14b are within the same field of view 38F, the two indices 14a and 14b are read and the CCD
It is possible to detect the slope between the ^C X coordinate axis and the photodiode 14 of the camera 38 directly. However, the field of view 38F of the CCD camera 38 is narrow, and the two indices 14a, 1
If it is difficult to capture 4b in the same field of view 38F can not be directly detect the slope between ^C X coordinate axis and the photodiode 14 of the CCD camera 38.

Therefore, in this embodiment, first, one of the two indices 14a and 14b of the photodiode 14 is C
The first stage 32 is moved so as to be within the field of view 38F of the CD camera 38. At this time, the two indices 14a, 14
It is assumed that b is at points P and Q. Point P corresponding to index 14a
Is outside the field of view 38F of the CCD camera 38 and the index 14b
Is located in the field of view 38F of the CCD camera 38. Reading the coordinates ^{_{(C X 1, C Y 1}} ) of the point Q at this time. Then, the first stage 32 is changed to the first stage 3
Move the second ^S X coordinate axis direction by a distance L, 2 one indicator 14a, 14b is the point P ', Q' to come to. This time, the point P 'corresponding to the index 14a comes within the field of view 38F of the CCD camera 38. Therefore, the coordinates of point P ′ ( ^C X ₂ , ^C
Read Y ₂ ).

Points P, Q and P 'include two sides of length L.
It is an isosceles triangle. This and the coordinates of point Q (^CX
₁,^CY₁) And the coordinates of point P ′ (^CX_Two,^CY_Two)When
From the slope θ₀Can be obtained according to the following equation (3).
Wear. θ₀= 2 sin^-1[｛(^CX₁−^CX_Two)^Two+ (^CY₁−^CY_Two)^Two｝^1/2/ L] (3) of the first stage 32 thus obtained first^SX coordinate axis
And the CCD camera 38 ^CSlope δ from X coordinate axis_SXWhen,
Of the first stage 32^SX coordinate axis and photodiode 14
Slope θ between₀From the photodiode 14 and the CCD
Camera 38^CTilt θ from X coordinate axis_eIs the following equation
It can be determined according to (4) or (5). θ_e= Θ₀+ Δ_SX (However,^CY₁>^CY_Two) (4) θ_e= −θ₀+ Δ_SY(However,^CY₁<^CY_Two) (5) Tilt θ_eIs calculated by mounting each optical head 10.
May be performed every time, but a plurality of optical heads 1 having the same configuration
When mounting lots consisting of 0 consecutively, the first light
This calculation is performed when implementing the
The result may be stored in the coordinate conversion module 52. Ma
Similarly, the hologram 16 and the CCD camera 38
^CTilt θ from X coordinate axis_eAsk for.

Then, the positions of the photodiode 14 and the hologram 16 are obtained. Since the positional relationship between the light emitting point of the laser diode 12 and the photodiode 14 is determined at the time of design, if the positional relationship between the photodiode 14 and the hologram 16 is known, the laser diode 1
The photodiode 14 and the hologram 16 can be positioned so that the two light emitting points are at the center of the hologram 16.

In positioning the photodiode 14 and the hologram 16, first, the first stage 32 and the second
Of the first stage 32 and the coordinates of the first stage 32 and the second stage 34 using the coordinate conversion module 52. Therefore, the first stage 32 and the second stage 32
Stage 34 moves to a desired position.

However, as shown in FIG. 3, the light emitting point 12L at the time of designing the laser diode 12 is different from the actual light emitting point 12L.
L ′. In this embodiment, as described above, the position of the light emitting point 12L 'in the non-light emitting state can be detected. This detection can also be performed by the CCD camera 38. Therefore, the difference ΔX between the light emitting point 12L at the time of design and the actual light emitting point 12L ′ is calculated, and the above-described positioning is corrected by rotating the hologram 16 by an angle corresponding to ΔX.

FIGS. 8 and 9 are flowcharts of control for mounting the optical head 10. FIG. At steps 61 and 62, the angular deviations (tilts) δ _SX and δ _SY are measured, and at step 69 the results are stored. This is a preparation stage. In step 63, the laser diode 12 and the photodiode 14 are set on the first stage 32, and the hologram 16 is set on the second stage 34. Then, in steps 64 and 65, optical images of the photodiode 14 and the hologram 16 are acquired and their positions are analyzed. In step 66, the displacement between the laser diode 12 and the photodiode 14 is detected,
In step 67, the positions of the laser diode 12, the photodiode 14, and the hologram 16 are detected. Here, it is also possible to perform the calculation of θ _o. Then, the process proceeds to step 68 to perform coordinate conversion. In step 70, it is determined whether or not there is a displacement between the laser diode 12 and the photodiode 14. If there is a displacement, the process proceeds to step 71 to correct the angle of the hologram 16. 72
Head to. If there is no displacement, the process proceeds to step 72, where the laser diode 12 and the hologram 16 are positioned.

[0035]

As described above, according to the present invention,
Even if there is an inclination between the coordinate axis of the stage and the coordinate axis of the detecting means, such an inclination is measured and stored, and positioning can be performed while performing coordinate transformation. Therefore, accurate positioning can be performed in a short time. In addition, since the positioning can be performed while detecting the positions of the light emitting means and the light receiving means in the non-light emitting state of the light emitting means, the configuration of the mounting apparatus can be simplified.

[Brief description of the drawings]

FIG. 1 is a view illustrating an optical head mounting apparatus and method according to an embodiment of the present invention.

FIG. 2 is a plan view of a laser diode.

FIG. 3 is a plan view showing a laser diode and a photodiode.

FIG. 4 is a diagram showing a tilt between a coordinate axis of a stage and a coordinate axis of a CCD camera.

FIG. 5 is a diagram illustrating an example of detecting an inclination between an X coordinate axis of a stage and an X coordinate axis of a CCD camera.

FIG. 6 is a diagram showing an example of detecting the inclination between the Y coordinate axis of the stage and the Y coordinate axis of the CCD camera.

FIG. 7 is a diagram illustrating an example of detecting an inclination between a coordinate axis of a stage and a photodiode.

FIG. 8 is a flowchart illustrating a control example for implementing using the apparatus of FIG. 1;

FIG. 9 is a flowchart showing a continuation of the flowchart of FIG. 8;

FIG. 10 is an exploded perspective view showing an example of an optical head.

FIG. 11 is a side view showing an example of an optical head.

FIG. 12 is a diagram showing a relationship among a laser diode, a photodiode, and a hologram.

FIG. 13 is a diagram showing a conventional technique.

[Description of Signs] 10 Optical head 12 Laser diode 12a, 12b Index 14 Photodiode 14a, 14b Index 16 Hologram 16a, 16b Index 18 Stem 20 Cap 32 First stage 34 Second Stage 38 ... CCD camera

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hideo Kato 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Tetsuo Hitsuka 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa No. 1 Inside Fujitsu Limited

Claims (11)

[Claims] An optical head mounting apparatus comprising a light emitting means, a light receiving means, and an optical element, wherein light emitted from the light emitting means is reflected by a reflection medium and enters the light receiving means via the optical element. A first stage for supporting the light emitting means and the light receiving means, a second stage for supporting the optical element, the light emitting means and the light receiving means supported by the first stage, and the second stage supported by the second stage; Detecting means capable of detecting the position of the optical element; inclination between a coordinate axis of the first stage and a coordinate axis between the detecting means; and a detecting means between the coordinate axis of the second stage and the detecting means. A coordinate conversion module that calculates and stores an inclination between the coordinate axes of the first stage and the position of the light-emitting unit and the position of the light-receiving unit supported by the first stage and the position of the light-receiving unit detected by the detection unit; Supported An optical head mounting device comprising: a control unit configured to convert the position of the optical element according to the coordinate conversion module and control the first stage and the second stage. 2. A method of mounting an optical head, comprising: a light emitting means, a light receiving means, and an optical element, wherein light emitted from the light emitting means is reflected by a reflection medium and enters the light receiving means via the optical element. Determining the inclination between each coordinate axis of the first and second stages and the coordinate axis of the detection means; storing the obtained inclination; and determining the positions of the light emitting means and the light receiving means supported by the first stage. The position of the optical element supported by the second stage is detected by the detection unit, the position of the optical element supported by the second stage is detected by the detection unit, and the light emitting unit and the light receiving unit supported by the first stage are detected by the detection unit. A method for mounting an optical head, comprising: converting a position and a position of an optical element supported by the second stage in accordance with a stored tilt and controlling the first stage and the second stage. 3. A step of determining an inclination between each coordinate axis of the first and second stages and a coordinate axis of a detecting means,
Two positions when an indicator provided on each of the first and second stages or supported on the stage, the light-emitting unit, the light-receiving unit, and the optical element is moved in the field of view of the detection unit. The method for mounting an optical head according to claim 2, wherein the optical head is obtained from the following coordinates. 4. The method according to claim 1, further comprising the step of calculating an inclination between each of the coordinate axes of the first and second stages and one of a light emitting unit, a light receiving unit, and an optical element supported by the stage. The mounting method of the optical head according to claim 2. 5. The step of determining an inclination between each coordinate axis of the first and second stages and one of a light-emitting unit, a light-receiving unit, and an optical element supported by the stage.
5. The method according to claim 4, wherein each of the two indices provided on each of the second stage and the second stage is determined by detecting the two indices in a different field of view of the detecting means. . 6. A tilt between a coordinate axis of each of the first and second stages and a coordinate axis of the detecting means, a coordinate axis of each of the first and second stages, and a light emitting means supported by the stage. From the inclination between one of the light receiving means and one of the optical elements, the inclination between one of the light emitting means, the light receiving means and the optical element supported by the first and second stages and the coordinate axis of the detection means is determined. 5. The method according to claim 4, further comprising the step of: 7. The optical system according to claim 2, wherein said light emitting means comprises a laser diode, said light receiving means comprises a photodiode, said optical element comprises a hologram, and said detecting means comprises a CCD camera. How to mount the head. 8. The laser diode has a detecting section for detecting the position of the light emitting point in a non-light emitting state, and detects the light emitting point of the laser diode to correct the relative position between the photodiode and the hologram. The method for mounting an optical head according to claim 7, wherein: 9. An optical head comprising a light emitting means, a light receiving means, and an optical element, wherein light emitted from the light emitting means is reflected by a reflection medium and enters the light receiving means via the optical element. Each of the light receiving means and the optical element,
An optical head comprising at least two position detection indices arranged at predetermined intervals. 10. The optical head according to claim 10, wherein said light emitting means has a detecting section for detecting a position of a light emitting point in a non-light emitting state. 11. The light emitting device according to claim 10, wherein the detecting portion for detecting the position of the light emitting point in the non-light emitting state comprises two concave portions provided along one side of the light emitting means. Optical head.