JP2000011442A - Fixing member for optical parts and optical device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for regulation of a notched part direction at the time of insertion by insertion columnar optical parts having a chord notch in a semicircular groove slightly larger than the diameter of the optical parts in the bottom and positioning the optical axis center of the optical parts. SOLUTION: The groove 3 for fixing a collimator lens 2 of a block 1 is provided with the bottom 6 of a semicircular shape in the cross-section and perpendicular faces 7 facing near an aperture 8. The collimator lens 2 is fixed by inserting the lens from the aperture 8 and bringing the lens into contact with the perpendicular faces 7 and the bottom 6. The size (d) of the aperture 8 of the groove 3 is kept within the tolerance with respect to the diameter of the collimator lens 2. At the time of inserting the collimator lens 2 into the groove 3, the other part is supported on the inner peripheral side of the bottom 6 even if the lens notched part rides on the bottom 6. The optical axis O2 is then positioned and the reference plate 4 and reference axis 5 of the block 1 may be positioned at the optical axis center O1 of the block 1 to the block 1. Then, the optical axis center O2 of the collimator lens 2 and the luminous flux center of the laser are always aligned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical component fixing member and an optical device using the same.
The present invention relates to a fixing member for a cylindrical optical component having a chord-shaped notch in a cross section, and an optical device using the same.

[0002]

2. Description of the Related Art An optical recording / reproducing apparatus for recording / reproducing an optical recording medium, which is an example of an optical apparatus, is provided with an optical pick-up apparatus. There is further provided an objective lens control driving device for controlling and driving in the directions. Hereinafter, an example of an optical recording / reproducing apparatus for recording / reproducing a disc-shaped optical recording medium and an optical pickup apparatus will be described with reference to FIG. 3 which is a schematic plan view of FIG. 2 and FIG. The schematic configuration will be described.

[0003] The disk-shaped optical recording medium 11 is chucked on a turntable (not shown) attached to the rotating shaft of a spindle motor 28, and is rotated at a predetermined rotation speed. Semiconductor laser 13, collimator lens 2, beam splitter 1 constituting optical pickup device 12
4. The mirror 15, the objective lens control / drive unit 18, the condenser lens 16, the light receiving element 17, and the like are fixed to the block 1 with an adhesive or a screw, and the block 1 is connected to a pair of parallelly arranged guide shafts 27, for example. It is configured to be able to move integrally in the tracking direction by driving means constituted by a linear motor (not shown). And
The spindle motor 28, the pair of guide shafts 27, the linear motor, and the like are attached to a chassis (not shown) constituting the optical recording / reproducing apparatus 10.

The laser light emitted from the semiconductor laser 13 is converted into a parallel beam by the collimator lens 2 and passes through the beam splitter 14 to the optical recording medium 11 shown by a two-dot chain line in FIGS. 2 and 3. The light is reflected toward the optical recording medium 11 by a mirror 15 having a reflecting surface inclined at approximately 45 degrees. The laser light reflected by the mirror 15 is focused on the recording / reproducing surface of the optical recording medium 11 by the objective lens 19. The laser light reflected by the optical recording medium 11 passes through the objective lens 19 again, is reflected by the mirror 15 and the beam splitter 14, and is reflected by the condenser lens 16 by the light receiving element 1.
The light is condensed on 7. The photoelectric conversion is performed by the light receiving element 17, and a focusing error signal, a tracking error signal, an RF signal, and the like are detected.

[0005] The objective lens control and drive device 18 comprises an elastic body 20 composed of, for example, a pair of parallel springs or the like, in which a movable portion 21 holding the objective lens 19 is extended from a fixed portion 22.
Supported by A focusing coil 26 and a tracking coil 25 are fixed to the movable section 21. The focusing coil 26 and the tracking coil 25 are fixed to a yoke 23 composed of a pair of upright portions bent at right angles and parallel to the base, and to at least one of the opposing surfaces of the pair of upright portions. The magnet 24 is disposed in a gap of a magnetic circuit constituted by the magnet 24. Then, a control current based on the above-described focusing error signal and tracking error signal is applied to each of the focusing coil 26 and the tracking coil 25, and the movable section 21 holding the objective lens 19
Is driven and controlled in a focusing direction and a tracking direction.

[0006] The block 1 is integrally formed by, for example, zinc die-casting.
A holding mechanism is configured according to the shape of optical components such as the collimator lens 2, the beam splitter 14, the condenser lens 16, and the light receiving element 17. Lenses, which are generally cylindrical components, are configured so that their optical axes are aligned while being housed in grooves formed in the block 1.

Hereinafter, as an example, a groove for accommodating the collimator lens 2 in the block 1 will be described with reference to FIG.
This will be described with reference to FIGS. As shown in FIG. 4A, the groove 3, which is a fixing member of the collimator lens 2, which is a cylindrical optical component, has a V-shaped groove ( (Hereinafter, referred to as a V-groove portion), and is processed so that the collimator lens 2 is disposed in contact with the V-groove portion, and the optical axis center O ₂ of the collimator lens ₂ is positioned by the V-groove portion. , The block 1 is positioned at the optical axis center O ₁ of the block 1 with reference to the reference plane 4 of the block 1 and the reference axis 5 of the block 1. The semiconductor laser similarly mounted on the block 1 the light flux center of the laser beam emitted from the 13 is also positioned on the optical axis center O _1. Therefore, it is not the optical axis center O ₂ of the collimator lens 2 coincides with the light flux center of the laser beam. in this case, the groove The opening 8 of 3 After being larger set than the diameter of the collimator lens 2 to the collimator lens 2 easily inserted. Collimator lens 2 is inserted into the groove 3, it is fixed by an adhesive.

In this case, as shown in FIG. 5, the collimator lens 2 is made of, for example, plastic and is molded by injecting a resin material into a mold. The cut portion is formed so as to have, for example, a chord-shaped notch 9 so that the cut portion does not have burrs or the like. The size of the notch 9 is represented by an internal angle θ formed by the notch 9, for example, 1
5 to 45 degrees.

When the collimator lens 2 is inserted into the groove 3 and fixed, as shown in FIG. 4B, the notch 9 is inserted so as to be located on the opening 8 side with respect to the groove 3. The optical axis center O ₂ of the collimator lens 2 is positioned at the optical axis center O ₁ , but as shown in FIG. 4C, the notch 9 is inserted so that the notch 9 is on the V groove side with respect to the groove 3. If V
The notch 9 falls down so as to be in contact with the slope of the groove, and as a result, the optical axis center O ₂ of the collimator lens 2 is shifted to the optical axis center O _1.
Deviate. As a result, the laser beam deviates from the center of the light beam, deteriorating the optical characteristics and deteriorating the recording / reproducing characteristics.

Therefore, when inserting the collimator lens 2 into the groove 3, it is necessary to insert the collimator lens 2 into the groove 3 while confirming the direction of the notch 9; Man-hours have been required. Also, even when using an automatic machine such as a component insertion machine,
It is necessary to provide a direction discriminating function for the notch 9 and the configuration is complicated.

[0011]

SUMMARY OF THE INVENTION In view of the foregoing problems, the present invention provides a fixing member for easily positioning and fixing a columnar optical component having a chord-shaped notch at the center of the optical axis, and a fixing member for fixing the optical component. It is an object to provide an optical device using a fixing member.

[0012]

According to the present invention, there is provided a fixing member for an optical component, in which a cylindrical optical component having a chord-shaped notch in a cross section is inserted into a groove, and an optical axis center of the optical component is positioned. A fixing member for an optical component, wherein a cross-sectional shape of a bottom portion of the groove is semicircular, which is slightly larger than a diameter of the optical component. However, slightly large indicates that the optical component having a slightly large diameter can be inserted into the bottom of the groove.

An optical device according to the present invention uses the optical component fixing member according to the first aspect.

The operation of the above means will be described below.
According to the fixing member of the present invention and the optical device using the fixing member, when inserting and fixing a cylindrical optical component having a chord-shaped notch in the cross section, the direction of the notch is selected for the optical component. The optical component can be easily fixed while positioning the optical axis center of the optical component.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 1 as an example of a block for fixing an optical component such as a collimator lens to a groove-shaped fixing member in an optical pickup device of an optical device such as an optical recording and reproducing device. This will be described below with reference to FIG. The present invention is not limited to the embodiments. It is to be noted that the same reference numerals are given to components having the same structure as the conventional technology in the drawings.

FIG. 1A shows an optical recording / reproducing apparatus shown in FIG.
FIG. 3 is a schematic BB cross-sectional view of FIG. 1, showing a groove 3 for fixing the collimator lens 2 in the block 1. Groove 3
For example, in order to fix a collimator lens 2 which is a cylindrical optical component having a notch 9 having a chord-shaped cross section as shown in FIG. Is formed. The groove 3 has a bottom 6 having a semicircular cross section and a vertical surface 7 facing the vicinity of the opening 8 such that the collimator lens 2 is inserted from the opening 8 and comes into contact with the vertical surface 7 and the bottom 6. Fixed. The distance d between the openings 8 is substantially equal to the diameter D of the collimator lens 2 and is within a tolerance in which the collimator lens 2 can be inserted. For example, the diameter D of the collimator lens 2 is 5.5 mm
In this case, the distance d between the openings 8 and the diameter of the semicircle in the cross section of the bottom 6 are, for example, 5.5 + 0.0 mm over 5.5 mm.
It may be set to 4 mm or less.

When the collimator lens 2 is inserted into the groove 3, as shown in FIG. 1B, even if the notch 9 is on the bottom 6, the other portion is supported in contact with the inner peripheral side of the bottom 6. Therefore, the optical axis center O ₂ is fixed. Accordingly, the optical axis center O ₂ of the collimator lens 2, the vertical surface 7 and the bottom 6
And the block 1 is positioned with respect to the reference plane 4 and the reference axis 5 of the block 1.
It is positioned in the optical axis center O _1. The light flux center of the laser beam emitted from the semiconductor laser 13 attached to the block 1 in the same way is also positioned on the optical axis center O _1. Accordingly, the optical axis center O ₂ of the collimator lens 2 coincides with the optical beam center of the laser beam, the optical recording and reproducing apparatus 1
At 0, correct recording and reproduction can be performed without deteriorating the optical characteristics.

The present invention is not limited to the case where the collimator lens 2 of the optical recording / reproducing apparatus 10 is fixed to the groove 3 of the block 1,
It goes without saying that the present invention can be applied to a fixing member for fixing an optical component such as a lens of another optical device.

[0019]

According to the optical component fixing member and the optical device using the fixing member of the present invention, when a columnar optical component having a chordal cross section is fixed, the position of the notch is fixed. And can be easily fixed while positioning the optical axis center of the optical component.

[Brief description of the drawings]

FIGS. 1A and 1B show a fixing member of an optical component of the present invention, and are schematic BB cross-sectional views of FIG.

FIG. 2 is a schematic plan view of an optical recording / reproducing apparatus.

FIG. 3 is a schematic sectional view taken along the line AA of FIG. 2;

4 (a) to 4 (c) show a conventional fixing member for an optical component, and are schematic BB sectional views of FIG.

FIG. 5 is a schematic sectional view of an optical component.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Block, 2 ... Collimator lens, 3 ... Groove, 4 ... Reference plane, 5 ... Reference axis, 6 ... Bottom, 7 ... Vertical plane, 8 ... Opening, 9 ... Notch, 10 ... Optical recording / reproducing device, 11 ... optical recording medium, 12 ... optical pickup device, 13 ... semiconductor laser, 14 ... beam splitter, 15 ... mirror, 16 ...
Condensing lens, 17: light receiving element, 18: objective lens control and driving device, 19: objective lens, 20: elastic body, 21: movable part, 22: fixed part, 23: yoke, 24: magnet,
25: tracking coil, 26: focusing coil, 27: guide shaft, 28: spindle motor, d: interval, O ₁ : center of optical axis, O ₂ : center of optical axis, θ: internal angle, D:
diameter

Claims (2)

[Claims] 1. A fixing member for an optical component, wherein a columnar optical component having a chord-shaped notch in a cross section is inserted into a groove, and a center of an optical axis of the optical component is positioned. A fixing member for an optical component, wherein a cross-sectional shape of the optical component is a semicircle slightly larger than a diameter of the optical component. 2. An optical device comprising the optical component fixing member according to claim 1.