JPS58215739A - Pickup for optical information reproducer - Google Patents

Abstract

PURPOSE:To make optical axes of respective optical components coincident with each other, by providing horizontal and vertical reference surfaces to a case, forming optical components in the unified size and adhering closely the optical components on the vertical and horizontal reference surfaces. CONSTITUTION:The vertical reference surface A is in parallel with an optical axis l-l and the vertical reference surface C is in parallel with an optical axis g-g, the surfaces are flush with each other and on the same plane. In inserting a plate spring 112 into a U-groove of the case 111, locking pawls 201-1-2 are pressed between both walls of the case 111 and the U-groove, and the elastic force of the locking pawls 201-2-2 or the plate spring 112 produced through this pressing presses the optical components in contact with the horizontal reference surfac B. When each optical component is pressed in contact with the horizontal reference surface B and the vertical reference surface A in this way, the optical axes of respective optical components are made coincident and a positioning jig is removed. Thus, the optical axes of respective optical components are made coincident and the adjustment of the optical components is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an optical information reproducing pickup, which facilitates the manufacture of a case for incorporating optical components, simplifies the installation of optical components, and facilitates the reuse of optical components. This invention relates to an optical information reproducing pickup that eliminates adjustment.

An optical information reproducing pickup is composed of a plurality of optical parts, and the optical axes of these optical parts must be precisely aligned.

Therefore, each optical component and the case in which these optical components are assembled are required to be manufactured with high precision.

Also, strict precision is required when a plurality of optical components are assembled into the case.

Hereinafter, a typical example of an optical information reproducing pickup is shown in FIG. 1, and its outline will be explained.

The optical information pickup includes a laser diode 1, a condensing lens 21, a diffraction grating 3. Deflection grism 4°λ/4 plate5.
Mirror 6, actuator 7, cylindrical lens 9. The optical components of the detector IO are assembled into a case 11.

The laser light emitted by the laser diode 1 is transmitted from the point light source of the laser diode 1 to a condensing lens 2 with a certain spread.
The Lehde light that has entered the condenser lens 2 becomes a parallel light beam that passes through the diffraction grating 3 and reaches the deflection prism 4 . The light incident on the polarizing prism 4 is set in advance to be polarized in a specific direction, so that the light emitted by the laser diode 1 is set to be polarized in a specific direction so that the light that enters the polarizing prism 4 is transmitted as is. The light that has passed through is λ
The linearly polarized light is converted into circularly polarized light by the /4 plate 5, the optical axis is bent by 9()0 by the mirror 6, and the light is incident on the actuator 7. This light beam passes through an objective lens 8 installed on the actuator 7 to the disk surface 12.
is irradiated.

This disk surface 12 has a track spacing of -5m and a depth of λ/
4 bits (λ=laser light wavelength in the track direction) are provided, and a signal is read from the disk surface 12 by sending a pickup in the track direction relative to the disk surface 12 to determine the presence or absence of this pit.

When the disk surface 12 is rotating, the gap between the objective lens 8 and the disk surface 12 changes due to the flatness error of the disk surface 12. In order to keep this gap constant, the actuator 7 is always served in the optical axis direction (focus direction), so that the laser beam is always focused on the 120-pit recording surface of the disk to a diameter of about 1 μm. adjusted.

In addition to the above focus direction, the actuator 7
It is possible to move in the jitter direction (tangential direction) and the tracking direction (radial direction of the track) with respect to the tracks that are lined up at a pitch of several microns on the disk surface 12.
The radar beam is not focused on the specific track being detected.

Focus direction of the actuator tough mentioned above.

Three-dimensional movement control in the jitter direction and tracking direction is
The focus direction is determined by the actuator 7, and the other jitter and tracking directions are determined by the actuator 7.
Various control methods have been considered, such as using two vibrating mirrors or a combination of electrical processing and vibrating mirrors.

In this way, the actuator 7 is moved in three-dimensional directions, and the error in the flatness of the disk surface 12 is eliminated.
The laser beam is constantly detected by moving it to follow the eccentricity of the track carved in the track.
It focuses light with a diameter of μm and stably extracts information recorded on the disk surface 12.

The laser beam reflected from the disk surface 12 undergoes a 180° change in the direction in which the speed of light travels, so it becomes circularly polarized light in the opposite direction to the incident light, returns to the same optical path as the incident light, and enters the λ/4 plate 5. , the polarized beam emitted from one laser diode becomes linearly polarized light whose direction is converted to λ2.

This linearly polarized light is deflected by a polarizing prism 4, and is sent to a detector via a serial/trical lens 9 provided to control the focus direction of an actuator 7.
leading to.

In this way, each optical component interposed in the optical path from the radar diode 1 to the detector 1.0 is arranged at a specific position in the optical axis direction KJj, and those components are arranged at right angles to the optical axis. The optical component is arranged and fixed to the case with high precision within a plane or a plane having a specific angle (hereinafter referred to as the optical axis plane of the optical component).

Conventional optical components have been assembled as shown in FIGS. 1 to 5.

That is, as shown in FIG. 1, a laser diode 1. which is an optical component disposed on an optical axis 1-1. Condensing lens 21 Diffraction grating 3. Polarizing prism 4. A λ/4 plate 5, a mirror 6, and a polarizing prism 4 disposed on the optical axis gg. Cylindrical lens9. The case 11 is provided with a built-in part corresponding to each optical component, in accordance with the dimensions and shapes of each optical part and component of the detector IO, the position of each optical component in the optical axis direction, and the optical axis plane of the optical component. Ta.

Furthermore, as shown in FIG. 2, which is a cross-sectional view, the assembly part of the case 11 is constructed using a high-precision machine so that the optical component and the assembly part of the case 11 are assembled with a certain mechanical fitting tolerance. Finishing is required.

In other words, a certain surface finish is performed on the a-plane to the n-plane and the p-plane, and the position of each optical component in the direction of the optical axis 1-1 and the optical axis plane are arranged with high precision with respect to the optical axis 1-1. For example, the inter-plane distance between the b-plane and the 0-plane and the distance from the n-plane to the optical axis 1-1 need to be finished with high precision.

Also, attaching these optical components to the case 11 is the third step.
As shown in the figure, set screws 1-1.1-2. 〜9-1゜9-2. Installed by. Further, the polarizing prism 4 and the mirror 6 are brought into surface contact with the integrated portion of the case 11 and fixed with an adhesive.

Furthermore, details of optical component assembly will be explained with reference to FIGS. 4 and 5.

First, the incorporation of the diffraction grating 30 will be explained in detail with reference to FIG. 4, which shows an example. In this diffraction grating 3, it is necessary to position the angle of the lattice fringes at a specific angle. In this example, the angle adjustment of the checkered stripes is not adjusted, and the diffraction grating 3 is composed of one diffraction grating plate 22, a holder n, and a mounting plate 20. The diffraction grating plate 22 is inserted into the storage groove of the holder at a certain angle with a certain fitting tolerance, that is, the diffraction grating plate 22 is made with a width C1 and a length C2 formed in the holder path and a longitudinal interval b2. It is inserted with a certain fit tolerance. This dimensional relationship is expressed by the formula: b2=bl+Δl.

C2:': Cl+Δ2 Tolerance Δl and Δ2 are both positive numbers Δ! , Δ2≧0 (hereinafter Δl and Δ2 are referred to as tolerances of the diffraction grating plate).

After inserting the diffraction grating plate n into the holder path in this way, the projection 26 provided on the upper surface of the holder path is fitted into the hole 21 drilled in the mounting plate, and the mounting plate is inserted into the upper surface of the holder path. The diffraction grating plate 22 is fixed to the holder path, and the diffraction grating 3 is formed.

The diffraction grating 3 thus formed is shown in the case 11.
It is attached to the mounting stand n provided in the holder with a certain fit tolerance.

That is, the idbin 25-1°25 provided in the holder path
-2.2.5-3. The distance d2 formed by the mounting stand n, the thickness dl of the mounting stand n, the width al of the holder path, and the dimension a2 between the mounting and mounting stands are fitted with a certain fitting tolerance.

This dimensional relationship is expressed by the formula: d2″ci, +Δ3 + a2 ”” al+Δ4・
Tolerance Δ3. Δ4 is a positive number, and Δ3. (hereinafter Δ3.Δ4 will be referred to as the diffraction grating tolerance). After the diffraction grating 3 is fitted in this way, the diffraction grating 3 is fixed to the mounting stand n using a set screw path.

Next, with reference to FIG. 5, the incorporation of a condensing lens provided with an adjustment mechanism will be illustrated and explained.

In the figure, reference numeral 41 denotes a condensing lens holder, which accommodates a plurality of lens systems or a single lens system. is housed in the condenser lens holder 41.

The condensing lens holder 41 is fitted into a slot provided in the storage block 31 and fixed by a bush 42 . The storage block 31 is also provided with a plate spring insertion part, and with the plate spring 30-1 formed on the mounting plate (2) inserted into the plate spring insertion part 33, a set screw 39 is screwed into the screw hole. Then, the mounting plate 30 is fixed to the storage block to form the condenser lens 2.

The condensing lens 2 configured in this way is fitted into the assembly stands 36-1 and 36-2 provided in the case 11 with a certain fitting tolerance, and is attached to the assembly stands 36-1 and 36-2 by the setscrews 37 and 40. It is fixed at 36-1 and 36-2.

That is, the gap f1 formed by the idle pin 32-1 provided in the storage block 31 and the assembly stand 3G-1
The mounting stand 36-3 is fitted with a certain fitting tolerance between the thickness f3, the gap f2 formed by the guide pin 32-2, and the thickness f4 of the assembly stand 36-3.

Expressing this in the formula: f1°f3+Δ6. f2°f4+Δ6 Tolerance Δ5. Δ6
is a positive number, and Δ5. Δ6≧0 (hereinafter referred to as condenser lens tolerance).

The relationship between dimensions e1 and 02 in the figure is that the mounting gray) 30 is
When fixed to the assembly stand 36-1 by the set screw 37, the dimensional relationship is such that there is a certain gap between the adjustment screw 40 side of the mounting gray) 30 and the top of the assembly stand 36-2. . Therefore, depending on the screwing depth of the adjustment screw 40, the condenser lens 2 moves against the elastic force of the mounting grate with the set screw 37 as a fixing point. Also, depending on the screwing depth of the adjustment screw, the storage block 31 moves against the elastic force of the leaf spring 30-1 with the root of the leaf spring 30-1 as a fixed point. At this time, the storage block 31 is guided along the assembly stand areas -1 and 36-3 by the guide pins 32-1 and 32-2.

In the conventional optical component assembly structure constructed as described above, it is necessary to provide the case with assembly sections corresponding to the individual optical components, and to perform high-precision machining for each assembly section. Reeds, for example, as shown in Figure 2, a
Perpendicular plane of plane ~ l plane (affects positioning in optical axis direction)
On the other hand, there are horizontal planes such as the Jon plane (which affects the alignment of the optical axes of each optical component), and planes with a certain inclination such as the P plane (for example, the surface for a diffraction grating plate or mirror). ) However, it is extremely difficult to perform high-precision machining on each of these surfaces, and as a result, the number of man-hours required to manufacture the case increases. This has the disadvantage of making positioning of parts difficult.

In addition, since individual optical components were fixed to the case with set screws or adhesive, the number of man-hours required for screw fixing was reduced.
The number of man-hours required for assembly is very large, such as the number of man-hours required for adhesion and the time required to solidify the adhesive, resulting in a disadvantage that the assembly cost is greatly increased and the product value is reduced.

In addition to reducing the reliability of the product due to variations in adhesive strength and flow of adhesive, production management and production technology such as auxiliary equipment related to adhesive application, adhesive management, and dispenser blinds for adhesion, etc. There were many problems with the surface, and the use of adhesives was a major obstacle to mass production.

Furthermore, when assembling individual optical components into a case, each component was housed in a carrier holder and this holder was attached to the case, so fitting tolerances between each component and the holder, such as diffraction grating plate tolerances, etc. Fitting tolerances between the holder and the case, such as diffraction grating tolerances and condensing lens tolerances, are integrated, and furthermore, the tolerances of each optical component and the manufacturing errors of the case are integrated, and the adjustment of each optical component with respect to the optical axis direction is integrated. It is always necessary to make adjustments to match the optical axes of optical components and optical components.
This adjustment has the disadvantage of being very difficult. Furthermore, since the above adjustment is necessary, each optical component requires an adjustment machine, which complicates the mechanism and increases the number of parts. Further increasing manufacturing, assembly, and adjustment man-hours,
This had the disadvantage of further decreasing production value.

The present invention simplifies manufacturing and assembly and eliminates the need for adjustment.
The object of the present invention is to provide an optical information reproducing pick-up bag with improved product value and reliability.

That is, in the present invention, the case has the same horizontal plane parallel to the optical axis,
Two reference planes with the same vertical plane are provided, and the optical axis plane of each optical component is formed into a cylindrical shape with the same dimensions in the positive direction or the same diameter. By arranging the optical components in close contact with two reference planes, the optical axes of each optical component are made to coincide with each other. After each optical component is positioned in the optical axis direction using a positioning jig, these optical components are held by a holding member. It is characterized by being held in close contact with two reference surfaces provided on the case.

Examples of the present invention will be described in detail below.

First, an outline of the embodiment of the present application will be explained. The case 110 component assembly part is formed in a U-groove shape along the optical axis 1-1 and gg, and this U-groove is formed in the same vertical reference plane parallel to the optical axis 1-1 and gg. Hold A and C (see Figure 8) and turn 9.
As shown in Figures 10 and 22, each optical component has the same horizontal reference plane B parallel to the optical axes t-t and g-H. , as shown in FIG. 9 and FIG.
Like the polarizing grism 104 shaped into a square of 4,
Each optical axis passes through the center, and D2 +D4 eH4
are formed with equal dimensions.

That is, the optical axis plane including the optical axis of the optical component is formed into the same square or cylindrical shape with the same diameter.

As shown in FIGS. 9 and 10, these optical components are closely integrated into the vertical reference planes A and C and the horizontal reference plane B formed in the case 111, so that the light of each optical component is The axes t-t and gg coincide. The members that hold this optical component in close contact with the vertical reference planes A and C and the horizontal reference plane B are, as shown in FIG. 203-2, 20
2-2, 202-1, 201-2.

喀201-1, 204-1, 204-2, 205-
1, 205-2, and horizontal clamp plate springs 206, 207-1, 2 bent to match the shape of the optical component.
07-2, 208, 209, (Fig. 7, Fig. 9,
By integrally molding the plate spring 112 (see FIG. 10) and fitting the plate spring 112 into the U groove provided in the case 111, the plate spring 112 is fitted into the U groove by the elastic force of the retaining claw. At the same time, the optical component is brought into close contact with the horizontal reference plane B, and the optical component is held in close contact with the vertical reference planes A and C by the horizontal flang plate springs.

Further, the positioning of the optical components in the optical axis direction is achieved by forming through holes 71-1.71-2.74- in the bottom of the U groove provided in the case 111 in accordance with the arrangement of the optical components, as shown in FIG.
1.74-2.76-1.76-2.79-1.

79-2. On the other hand, a pair of pins and leaf springs (Fig. 99-1.99-2, Fig. 4-91-1.91-2.94-1.94-2. 96-
1.96-2. ) is set upright to constitute the positioning jig 100, and the actuator mounting hole 60 (FIG. 4) is provided on the back surface of the case 111 while inserting a pair of pins and a leaf spring into the through hole provided on the bottom of the case 111. The protrusion 61 provided on the positioning jig 100 is fitted into the protrusion 61 (FIG. 4), and the positioning jig 100 is rotated around this fitted part to remove the side wall 80 of the stock provided on the positioning jig 100. 1
By bringing the sides of the case 111 into close contact with each other, the relative positional relationship between the positioning jig 100 and the case 111 is maintained.
Thereafter, by sandwiching the optical component between the pair of pins and the leaf spring by the elastic force of the leaf spring, the optical component is positioned with respect to the case 111 in the optical axis direction.

In this way, the optical components are positioned with respect to the optical axis direction, and the horizontal reference plane B and the vertical reference planes A and C of the case 111 are aligned.
After being closely held on the surface by the holding member, the positioning jig 100 in the optical axis direction is removed and the case 111
Optical components are attached to the lens.

With this configuration, the mechanical finishing surface of the case 111 only needs to be the vertical reference planes A and C and the horizontal reference plane B, and since these reference planes represent the same plane, the mechanical finishing of the case 111 is simplified. be converted into In addition, the optical axis surfaces of the optical components are square with the same dimensions or cylindrical with the same diameter, and by bringing them into close contact with the reference surface, the optical axes of the respective optical components coincide and the optical components are aligned. It appears that no adjustment is necessary. Further, since the optical component is held by the holding member, assembly of the optical component into the case 111 is simplified.

The details will be explained in more detail below. FIG. 6 shows the component configuration of a pink-up for optical information reproduction. In the figure, a laser diode 101. A cylindrical condenser lens 102 whose optical axis surface has a circular shape with a diameter D3. Diffraction grating 103 whose optical axis plane is shaped to a height Ds
．． Polarizing prism 1 whose optical axis surface is formed to have a height D6 and a width D9
04. A λ/4 plate 105 whose optical axis surface is formed to have a height D7, and a mirror 106 whose optical axis surface is formed to a height Ds and a width to.
are arranged at a predetermined distance from each other. Also, optical axis g-
In the direction g, the detector 10 and the optical axis plane have a diameter D4.
a cylindrical lens 109 formed into a cylindrical shape;
Polarizing prisms 104 whose optical axis planes are elevated and shaped into rl]D are arranged at a predetermined distance apart.

Among these optical components, the optical axis planes of the radar diode 101 and the detector 110, which are incorporated into the end face of the case 111, are connected to the vertical reference planes A and C provided in the case 111 and the horizontal reference plane B (FIG. 8, (see FIG. 9), and therefore there are no dimensional restrictions.

In addition, since the thickness of the parts is thin, the vertical reference plane A provided in the case 111
, C and the horizontal reference plane B, the diffraction grating 1 cannot be positioned.
03 and the λ/4 plate 105 in case 1 as shown in FIG.
11 is provided with long grooves 130-1 and 131-1 perpendicular to the optical axis, and the positioning is performed by the vertical plane of the long grooves 130-1 and 131-1, so there is no dimensional restriction in the width direction.

The relationship between the optical axis dimensions of these optical components is the height dimension D3 +
D5 +D6 +D? +D11 are all the same size. Also, a condensing lens 102. polarizing prism 1
04, the optical axis plane of the mirror 106 is square or circular with equal height and width dimensions. Furthermore, the optical axes of these optical components are shaped to pass through the center of the optical axis plane.

Next, as shown in FIG. 7, the holding member 112 that holds the optical component in close contact with the vertical reference planes A and C and the horizontal reference plane B provided on the case 111 has pull-out prevention claws 201-1 and 201-2.
01-2, 202-1, 202-2.203-1.
203-'2゜204-1, 204-2, 205-
1, 205-2, and horizontal flange leaf springs 206, 207-1 bent to match the shape and arrangement of the optical components.
, 207-2, 208, 209, and so on. In this embodiment, the holding member 112 is integrally formed by punching and molding a single iron plate.
It is not limited to this, but it may be divided into two parts: 1 and the optical axis gg. Further, the width D20 of the horizontal flange plate spring is wider than the U groove width I)st provided in the case 111, as shown in FIGS. 16 to 18, and its shape is as follows. Not only is it flat, but it is also molded into a shape that will not fall out. In addition to the above-mentioned pull-out prevention claw and horizontal flang leaf spring, this holding member 112 includes: 19th
As shown in the figure, long grooves 130-1 and 130-2 are provided with a diffraction grating 103 and a λ/4 plate 105 in a case 111.
, 131-1.

Optical axis direction flang plate springs 161-1, 161- for fixing to the α plane and β plane (optical axis direction reference plane) of 131-2
2°162-1 and 162-2 are provided.

Examples of horizontal flanged leaf springs for circular and square optical axis planes are shown in FIGS. 9 and 10.

In FIG. 8, the vertical reference plane β plane is parallel to the optical axis 1-1, and the planes are flush with each other.

Similarly, the vertical reference plane C is parallel to the optical axis g-g and is on the same plane. On the other hand, the horizontal reference plane B is the 9th. lO
As shown in FIGS. 14 and 14, they are parallel to the optical axes t-t and gg, and their respective surfaces are the same plane.

Next, positioning in the optical axis direction will be explained. In the 21st to 21st figures, the bottom of the case 111 has a pair of through holes 71-1, . 71. -2゜7
4-1.74-2.76-1.76-2.79-1.7
9-2° is drilled. In the figure, 141 is the condenser lens 1
02° 144 is the polarizing prism 104, and 146 is the assembly part of the mirror 106. For example, a pair of through holes 71-1 and 71-2 are provided at positions sandwiching the condenser lens 102 in the optical axis direction.
is drilled. Further, on the back surface of the case 111, there is an actuator mounting hole 60 for maintaining the relative positional relationship between the positioning jig 100 in the optical axis direction and the case 111.
(Figure η) is provided.

That is, the protrusion 61 (Figure N) provided on the positioning jig 100 is fitted into the actuator mounting hole ω, and the side wall 8O-1 (Figure A) of the stone base provided on the positioning jig 100 is fitted. By bringing the sides of the case 111 into close contact,
The relative positions of the case 111 and the positioning jig 100 are maintained. In this way, insert the protrusion 6 into the actuator mounting hole (A).
1 and when determining the relative positional relationship between the case 111 and the positioning jig 100, with the protrusion 61 fitted in the actuator mounting hole (A), move the case around the fitting part. 111 or by rotating the positioning jig 100, in order to facilitate this relative positional alignment, the side wall 81- of the protrusion 81 provided on the positioning jig 100 is
A clearance is provided between the case 111 and the side surface of the case 111 (FIG. 26).

Further, the positioning jig 100 has a pair of bottles and a leaf spring erected thereon, as shown in Figures 1 and 2.

In other words, bottle 99-1 and a leaf spring! 49-2. -n91-1
and leaf spring 91-2. Bottle 94-1 and leaf spring 94-2. A pair of bottles and a plate spring, such as a bottle 96-1 and a plate spring 96-2, are set upright facing each other, and the distance d4 +dl +d2 +d3 between the bottle and the plate spring is equal to For the length D of the optical component, d4+'l+d2
+d3 +<D, and the optical component fitted between the bottle and the plate spring is pressed against the bottle and clamped by the elastic force of the plate spring.

The operation of this embodiment configured as above will be explained next.

First, the protrusion 61 is fitted into the actuator mounting hole ω while inserting the bottle and plate spring set up in the positioning jig 100 in the optical axis direction into the through hole provided at the bottom of the case 111. While bringing the side surface 80-1 and the side surface of the case 111 into close contact, the case 111 and the positioning jig 1 are
00 is maintained, and a pair of bottles and a leaf spring are projected at predetermined positions in the optical axis direction of the case 111 (Fig. 27). By fitting predetermined optical components between the bottle and the leaf spring, each optical component is positioned and clamped at a predetermined position in the optical axis direction of the case 111. For example, in FIG.
1 and a leaf spring 91-2, and is clamped by the elastic force of the leaf spring 91-2.

In this way, each optical component is connected to the case 111.
are arranged at predetermined positions in the optical axis direction.

After each optical component is arranged at a predetermined position in the optical axis direction in this manner, the plate spring 112 is fitted into the U groove of the case 111 (see FIG. 8). At the time of this fitting, as shown in FIGS. 16 to 18, 1
1-1 and 201-2 are press-fitted between the case 111 and both walls of the U-groove provided, and removal caused by this press-fitting is prevented by the elastic force of the preventive claws 201-1 and 201-2 or the leaf spring 112. , the optical component is held in pressure contact with the horizontal reference plane B. At the same time, for example, as shown in FIGS. 9 and 10, the horizontal clamp leaf spring 206 or 207-1,
The optical component is held in pressure contact with the vertical plane A or the vertical plane 0 by 207-2.

In this way, each optical component has a horizontal reference plane B, a vertical reference plane A,
In the state in which the optical components are held in pressure contact with each other, the optical axes of each optical component coincide with each other, and the positioning jig 100 is removed downward.

At the same time, the diffraction grating 103 and the λ/4 plate 105 are connected to the long groove 131-1 provided in the case 111, as shown in FIG.
Optical axis direction clamp plate springs 161-1,
161-2, 162-1 and 162-2, and is held in pressure contact with the horizontal reference plane B.

Laser diode 101. The actuator 7 and the detector 110 are attached to the outside of the case 111 with their optical axes aligned.

As detailed above, according to the optical information reproducing pickup of the present invention, the case is provided with a horizontal reference plane and a vertical reference plane, while the optical components are molded to uniform dimensions, and these optical components are connected to the vertical reference plane. Since the optical components are brought into close contact with the horizontal reference plane, the optical axes of each optical component can be made to coincide with each other, and there is no need to adjust the optical components.

In addition, since a vertical reference plane and a horizontal reference plane are provided, and these planes are flush with the same plane, the machining of the surface into which optical components are installed can be simplified, and high precision can be achieved. The finished surface can be easily obtained, and the number of man-hours required for machining can be greatly reduced.

Furthermore, since one component is held by the holding member, assembly of the component into the case is simplified, and the number of assembly steps and number of components can be greatly reduced.

In this way, the synergistic effect of attaching optical components directly to the case without using a conventional holder and finishing the finished surface of the case with high precision makes it possible to assemble with high precision. In addition to improving product reliability, we aim to significantly reduce product costs by adjusting optical components, simplifying machining, simplifying assembly, and reducing the number of parts.
This has many effects, such as improving product value, simplifying production management, and making mass production possible.

[Brief explanation of the drawing]

1 to 5 are conventional examples. A perspective view showing the overall configuration of an optical information reproducing pickup; FIG. 2 is a cross-sectional view of the case taken along the optical axis 1-1; and FIG. 3 is a cross-sectional view showing how to assemble optical components. The illustrated perspective views, FIGS. 4 and 5, are perspective views showing in more detail how the optical components are assembled. Figures 6 to n show examples of the present application, Figure 6 is a perspective view showing the overall configuration of the optical information reproducing pickup, and Figure 7 is a perspective view mainly showing the holding member. , Figure 8 is
A plan view of the optical information reproducing pickup, FIGS. 9 to 15 are cross-sectional views of the main parts of FIG. 8, and FIGS. 16 to 18 are examples of the pull-out prevention claw provided on the leaf spring. Figure 19 is a plan view mainly showing the relationship between the diffraction grating, the λ/4 temporary part, and the leaf spring, and Figure 4 is a cross-sectional view of Figure 19 taken along the optical axis 1-1. FIG. 21 is a top view of the case, FIG. 2 is a cross-sectional view of FIG. 21 along the optical axis 1-1, and FIG. Figure 5 is a plan view showing the position and relationship between each optical component and the through hole. A plan view showing a state in which the holding member in the optical axis direction is inserted into the hole, Figure 1 is a cross-sectional view taken along the optical axis gg in Figure 5, and Figure n is a cross-sectional view taken along the optical axis gg in Figure 5.
FIG. 2 is a cross-sectional view taken along the optical axis 1-1 of the figure. 101... Laser diode, 102... Condensing lens, 103... Diffraction grating, 104... Polarizing prism, 105... V4 plate, 106... Mirror, 107...
... Actuator, 109 ... Serial/trical lens, 110 ... Detector, 111 ... Case, 1
12... Leaf springs, 201-1, 201-2. 202-1, 202-2, 203-1, 203-
2, 204-1, 204-2, 205-1, 2
05-2...Pull-out prevention claw, 206°207-1
, 207-2, 208...Horizontal clamp leaf spring. 161-1, 161-2, 162-1, 162-
2...Optical axis direction flange leaf spring (Fig. 19), 41-
1.41-2.44-1゜44-2.46-1.46-
2.49-1.49-2...Through hole (Fig. 21),
43-1.43-2.45-1.45-2... Long groove (
Fig. 21), 80, 81...ston'', 99-
1... Bin, 99-2... Leaf spring, 100... Positioning jig (No. 1, notification drawing). Figure 1 O Figure 3 Figure 6 Figure 7 ρ Figure 21 Figure 27 Continued from page 1 0 Inventor Yoshihiro Saeki 292 Yoshida-cho, Totsuka-ku, Yokohama City, Hitachi, Ltd. Production Technology Laboratory 0 Invention Masataka Shiba, Hitachi, Ltd. Production Technology Laboratory, 292 Yoshida-cho, Totsuka-ku, Yokohama

Claims (1)

[Claims] 1. An optical information reproducing device in which a plurality of optical components arranged on a straight line of the same optical axis are attached to a case,
Forming two reference planes parallel to the optical axis in the case, the same horizontal reference plane and the same vertical reference plane, and forming the optical axis plane of each optical component into the same square or circular shape with the same diameter, The optical components are brought into close contact with a horizontal reference plane and a vertical reference plane formed in the case so that the optical axes of each optical component are aligned linearly, and each optical component is positioned in the optical axis direction using a jig. A pickup for an optical information reproducing device, characterized in that an optical component is held in close contact with a horizontal reference plane and a vertical reference plane by a holding member. 2. In the pickup according to claim 1, the mounting portion of the optical component to be mounted on the case is formed in a U-groove shape, and a pull-out prevention claw portion is formed to match the width of the U-groove;
A flat spring formed integrally with a horizontal flange flat spring that has been bent and molded to match the arrangement and shape of the optical components is fitted into the U-groove, and the elastic force between the pull-out prevention claw and the horizontal flange flat spring is A pickup for an optical information reproducing device, characterized in that the holding member is constructed by holding an optical component in close contact with a horizontal reference plane and a vertical reference plane provided in the case. 3. In the pickup according to claim 1, the positioning jig for positioning each optical component in the optical axis direction is provided with a through hole in the bottom of the case in accordance with the arrangement of the optical components. The outer part of the case fits with a certain tolerance. A positioning jig is formed by erecting a pair of bottles and a leaf spring according to the arrangement of the optical parts and the dimensions of the optical parts, and the bottle and the leaf spring are inserted into a through hole provided at the bottom of the case. The elastic force of the leaf spring holds the optical components, and the actuator mounting hole provided at the bottom of the case allows each optical component to be moved in the optical axis direction while maintaining the relative positional relationship between the case and the optical components. 1. A pickup for an optical news playback device, characterized in that the pickup is configured to hold.