JPH1116204A - Lens position adjusting and fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust a lens focusing position and also to prevent the adjusted position from shifting after adjustment even when a strong impulse such as a drop, etc., is given. SOLUTION: This device is equipped with an adjusting member 14 for adjusting a lens barrel 19 in moving its position as against a supporting body 11 in a required direction, a holding member 21 for holding the lens barrel 19 under its adjustable state by the adjusting member 14 to the supporting body 11 by elastic force and a fixing member 22 for fixing the lens barrel 19 to the supporting body 11 by giving energizing force to the lens barrel 19 in the same direction as energizing force owing to the elastic force of the holding member 21. Then, this fixing member 22 is attachable to and detachable from the supporting body 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position adjusting and fixing device used in an optical device such as an optical information recording / reproducing device, which can finely adjust the position of a lens barrel and can fix the position.

[0002]

2. Description of the Related Art Conventionally, an optical information recording / reproducing apparatus as shown in FIG. 1 has been known. In FIG. 1, reference numeral 1 denotes a fixed optical unit. The fixed optical unit 1 emits laser light toward an optical path 2 between the movable optical unit and a laser beam reflected by an optical disk (not shown). Is received via the optical path 2. Reference numeral 3 denotes a movable optical unit which is provided so as to be movable in the direction of arrow A, and is optically connected to the fixed optical system 1 via the optical path 2. Also, reference numeral 4
Is a spindle motor for rotating the optical disk,
Reference numeral 5 denotes a rotation control unit that controls the rotation of the spindle motor 4.

The movable optical section 3 is slidably held by a pair of guide rails 6 and 6 parallel to the optical path 2, and reciprocates on the guide rails 6 and 6 by a linear motor mechanism 7. The linear motor mechanism 7 includes yokes 7a, 7a, magnets 7b, 7b, and coils 7c, 7c.

In the fixed optical section 1, a laser beam emitted from a semiconductor laser (not shown) is guided to an optical path 2 by an optical system.
A light receiving optical system or the like for guiding the laser beam incident through the light receiving element 8 to the light receiving element 8 is provided. At the time of manufacturing the fixed optical unit 1, in order to maintain the relative alignment relationship between the record carrier and the light beam, the optical axis and the focal position of each lens provided in the emission optical system and the light receiving optical system are set. It is necessary to move and fine-tune the alignment relationship accurately. Therefore, in the fixed optical system 1, as shown in FIGS. 2 to 6, a lens barrel 10 including a condenser lens in a light receiving optical system is provided as a part of a base (not shown) of the fixed optical unit 1. The support portion (base) 11 is provided so as to be finely adjustable.

FIGS. 2 to 6 are views for explaining the manner in which the focal position of the condenser lens is adjusted and fixed. FIG. 2 is a partially cutaway plan view of the fixed optical unit 1, and FIG. FIG. 4 is a side view of the main part, partially cut away, as viewed from the direction B in FIG. FIG. 5 is a bottom view showing details of a portion where the lens barrel (or lens frame) is mounted, and FIG. 6 is a cross-sectional view taken along line CC of FIG. In FIGS. 3, 4, and 6, the upside down is reversed, and the focal position of the condenser lens is adjusted from below the fixed optical unit 1.

This lens barrel (or lens frame) 10
A space 10a is formed inside, a condenser lens is built in the space 10a, and a light receiving element 8 is arranged in the direction in which the optical axis extends. Further, the outer peripheral frame 10b of the lens barrel 10
A flat portion 10d is formed at a lower portion along the optical axis direction of the lens, and a groove 10e is formed substantially at the center of the outer peripheral frame 10b in a direction orthogonal to the optical axis of the condenser lens.

On the other hand, the supporting portion 11 has a horizontal surface 11a.
And an upright surface 11b, and a flat portion 11a 'is formed on a horizontal surface 11a. The flat portion 11d is brought into contact with the flat portion 11a ', and
Is in contact with the outer peripheral frame 10b. A flat portion 11c is formed below the standing surface 11b (upward in the drawing). The base 13a of the mounting bracket 13 made of an elastic body is fixed to the flat portion 11c by the screw 12, and the tip 1 of the mounting bracket 13 is fixed.
On the 3b side, the outer peripheral frame 10b has an upright surface 11b and a flat portion 11a.
′ Are bent in a direction to be pressed so as to be stably contacted on both sides on average.

With this configuration, the outer frame 10b is pressed and held by the mounting bracket 13 against the horizontal surface 11a and the upright surface 11b. At this time,
Since this mounting bracket 13 has elasticity, the lens barrel 10 is moved by the elastic force to the horizontal plane 11a and the upright plane 11b.
, The lens barrel 10 is held without being detached, but the lens barrel 10 can be moved and adjusted in the optical axis direction in a state where the biasing force is applied.

[0009] As shown in FIG.
A notch 13c wider than the width d10 of the groove 10e is provided at the center. The width d13 of the notch 13c has a size adapted to the range in which the lens barrel 10 is to be moved during the adjustment of the lens focal position. The cut portion 13c is formed in the groove 10
e. The width d1 of the groove 10e
0 is a size to which the pin 14a of the adjustment rod 14 can be fitted. The pin 14a is eccentrically provided on the end surface 14b of the adjustment rod 14, as shown in FIG. In addition,
In FIG. 5, a pin 14a and an adjustment rod (depicted by a two-dot chain line circle) 14 are shown in order to clarify the positional relationship between the mounting bracket 13 and the pin 14a.

[0010] A knob 15 is attached to the adjusting rod 14, and by turning the knob 15 by hand, the adjusting rod 14 is rotated.
Can be rotated. The adjusting rod 14 and the knob 15 are fixed to a base member 17 of an adjusting device (not shown) by a bracket 16. Around the adjustment rod 14,
A compression coil spring 18 is provided between the bracket 16 and the bracket 16 to improve the operational feeling of the knob 15 when adjusting the focal point of the lens.

When adjusting the focal position of the condenser lens,
When the pin 14a is fitted into the groove 10e through the notch 13c, and the knob 15 is turned by hand to rotate the adjustment rod 14, the pin 14a is eccentrically provided. Move slightly in the direction. Thereby, the focal position of the condenser lens can be finely adjusted.

[0012]

However, in the above-mentioned prior art, since the fixing bracket is an elastic body, the position of the lens barrel may be shifted due to a strong impact such as a drop. It is also conceivable to fix with an adhesive to compensate for this, but if it is fixed with an adhesive or the like, there arises a problem that re-adjustment after fixing is not possible.

An object of the present invention is to provide a lens position adjusting / fixing device which can adjust a lens focal position and which does not move even if a strong impact such as a drop is applied after the adjustment. That is.

[0014]

In order to achieve the above object, according to the first aspect of the present invention, there is provided an adjusting member for adjusting a position by moving a position of a lens barrel in a necessary direction with respect to a support. A holding member for holding the lens barrel to the support body by elastic force in an adjustable state by the adjustment member; and a holding member attached to the lens barrel in the same direction as the biasing direction by the elastic force of the holding member. The apparatus is characterized in that the lens barrel is fixed to the support by applying force, and a fixing member detachable from the support is provided.

With this configuration, the position of the lens barrel is adjusted by the adjusting member while being held by the elastic force of the holding member. The adjusted position is maintained by the elastic force of the holding member, but is displaced by a strong impact. Therefore, in this adjusted state, the position of the lens barrel is fixed by the fixing member. At this time, if the lens barrel is fixed by a force in the same direction as the urging force held by the holding member, no displacement occurs in the fixing step. As a result, even if the fine adjustment is performed with high precision, the state is maintained, and the position does not shift even when there is a strong impact.

According to a second aspect of the present invention, the holding member is fixed to the support before adjusting the position of the lens barrel, and the fixing member is fixed to the support after adjusting the position of the lens barrel. Good.

After the holding member is fixed by the fixing member, the holding member becomes unnecessary for the time being, and may be detached from the lens position adjusting / fixing device. For this reason, if the holding member and the fixing member are configured to be independently fixed to and removable from the support, the weight of the lens position adjusting and fixing device can be reduced by removing the holding member that is no longer needed for the time being. . Also, if the position needs to be adjusted again,
What is necessary is just to mount this holding member. For this purpose, it is preferable that this fixing is configured to be repeatedly attachable / detachable by, for example, screws.

Such a configuration is simple, for example, if a large cut is provided across the fixing member at the center of the holding member, and the fixing member is fixed to the support using the cut portion.

[0019]

Embodiments of the present invention will be described below. The same components as those in the description of the related art will be denoted by the same reference numerals, detailed description will be omitted, and only different portions will be described.

The lens focal position adjusting and fixing device according to this embodiment adjusts and fixes the lens focal position of the emission optical system and the light receiving optical system provided inside the fixed optical unit 1 shown in FIG. It is a jig.

A support section 11 for finely adjusting the lens barrel 19 to a part of the base of the fixed optical section 1 not shown.
Is provided. FIGS. 8 to 11 show how the fixed optical system 1 adjusts and fixes the focal position.
FIG. 8 is a perspective view of a focus position adjusting / fixing device according to an embodiment before the fixing member is assembled, FIG. 9 is a bottom view before the fixing member is fixed, and FIG. 10 is a perspective view at the time of assembly. . FIG. 11 is a sectional view taken along line AA of FIG.

The supporting portion 11 has an L-shaped side surface having a horizontal surface 11a and an upright surface 11b. The lens barrel 19 has a space 19a formed therein, and a condenser lens is built in the space 19a. Lens barrel 1
9 at the lower center (upper center in the drawing) of the outer peripheral frame 19b
Is formed with a groove 19c orthogonal to the optical axis O1 of the condenser lens and parallel to the horizontal plane 11a.

Below the erecting surface 11b, there is formed a flat portion 11c parallel to the horizontal surface 11a. The plane part 11c
, A base 21a of a mounting bracket 21 made of an elastic body is fixed by a pair of screws 20 and 20.
1b is bent in a direction such that the outer peripheral frame 19b is pressed at an angle of about 45 degrees so that the outer peripheral frame 19b is stably abutted on both the upright surface 11b and the horizontal surface 11a on average.

With this configuration, the outer peripheral frame 19b is pressed and held by the mounting bracket 21 against the horizontal surface 11a and the upright surface 11b. At this time, since the mounting bracket 21 has elasticity, the lens barrel 19 is moved by the elastic force to the horizontal plane 11a and the upright surface 1a.
1b, the lens barrel 19 is held without being separated from the optical axis O while the urging force is applied.
The movement can be adjusted in one direction.

[0025] As shown in FIG.
A notch 21c wider than the width d19 of the groove 19c is provided at the center. The width d21 of the cutout portion 21c has a size adapted to the range in which the lens barrel 19 is to be moved during the adjustment of the lens focal position. The cut portion 21c is formed in the groove 19
c. A pin 14a of an adjustment rod (represented by a two-dot chain line circle) 14 is fitted into the groove 19c during adjustment.

When adjusting the focal position of the condenser lens,
After the pin 14a is engaged in the groove 19c, the adjustment rod 14 is rotated by manually turning the knob 15 (not shown). As a result, the lens barrel 19 slightly moves in the direction of the optical axis O1, and the focus position of the condenser lens can be finely adjusted smoothly.

In this state, in the lens position adjusting and fixing device, since the mounting bracket 21 is an elastic body, the position of the lens barrel 19 may be shifted due to a strong impact such as a drop. Therefore, in this embodiment, the fixing member 22 made of hard resin covers the mounting bracket 21 and fixes the lens barrel 19.

The fixing member 22 has a U-shaped cross section including a flat portion 22a and leg portions 22b and 22c on both sides. One leg 22b has three openings 23a-
23c is formed, and its bottom surface 22d is parallel to the plane portion 11c. Here, the central opening 23a is a screw hole for fixing the fixing member 22 to the support portion 11, and the opening 23a
23b and 23c formed on both sides of the bottom surface 22d
And a through hole for taking out the screw 20 after the fixing member 22 is attached, as described later.

An opening 24 is formed in the flat part 22a so as to penetrate in the vertical direction corresponding to the groove 19c. The opening 24 is slightly larger than the diameter of the adjustment rod 14 and
4, the adjusting rod 14 is loosely fitted in the opening 24,
Adjustment by the adjustment rod 14 is enabled. The bottom surface 22e of the other leg 22c is inclined at approximately 45 degrees with the tip 21b of the mounting bracket 21.

When the fixing member 22 is fixed by the screw 25, the bottom surface 22e is brought into contact with the area where the mounting member 21 comes into contact with the lens barrel 19, and the mounting member 21 is fixed to the fixing member 2.
2 firmly fixed. As a result, as shown in FIG.
Reference numeral 9 is firmly fixed and does not shift due to dropping or the like.

When adjusting the lens focal position again, after fixing the screws 20, 20, the screw 25 is loosened and the fixing by the fixing member 22 is released. In this state, the position of the lens barrel 19 can be readjusted.

Further, the mounting member and the fixing member can be formed so as to be independently detachable as shown in FIGS. As shown in FIG.
Has a large cutout 21c. This notch 2
1c straddles the fixing member 22 in a state where the fixing member 22 is fixed to the flat portion 11c. The bottom surface 22e 'of the fixing member 22 is inclined according to the outer diameter of the outer peripheral frame 19b.

With this configuration, as shown in FIG. 13, the position of the lens barrel 19 can be adjusted with the mounting bracket 21 attached. As shown in FIG. 12, when the fixing member 22 is fixed to the flat portion 11c inside the cutout portion 21c with the screw 25, the lens barrel 19b is directly in contact with the bottom surface 22e ', and the lens barrel 19 is firmly fixed. You. After being fixed by the fixing member 22, the mounting bracket 21 can be removed together with the screw 20, as shown in FIG. This can further reduce the weight.

In the above description, the optical information recording / reproducing apparatus has been described. The present invention can be used. Further, the present invention is also applicable to a lens adjustment fixing device that performs adjustment by rotating a lens frame around a lens optical axis.

In the above description, the lens barrel has been described as being mounted on the fixed optical system, but may be arranged on the movable optical system. By arranging it on the movable part in this way,
Even if the moment of inertia is large, the device of the present invention does not cause displacement. In addition, the device of the present invention, which can reduce the weight of parts, can reduce the wear of the driving part.

The opening 24 is necessary when the adjustment is performed with the screw 25 of the fixing member 22 loosened. However, when the adjustment is performed, the fixing member 22 is removed at the time of re-adjustment, or the adjustment rod 14 is inserted into the groove 19c. The opening 24 may not be provided if the position of the fixing member 22 is considered so that the fixing member 22 does not interfere with the mounting.

[0037]

As described above, according to the present invention,
It is possible to provide a lens position adjustment and fixing device that can adjust the lens focal position and that does not move the adjustment position even when a strong impact such as a drop is applied after the adjustment.

[Brief description of the drawings]

FIG. 1 is a plan view showing a schematic configuration of a general optical information recording / reproducing apparatus.

FIG. 2 is a plan view in which a part of a conventional fixed optical unit is cut away.

FIG. 3 is a partially cutaway side view of a main part of FIG. 2;

FIG. 4 is a main part side view of FIG. 3 as viewed from a direction B.

FIG. 5 is a bottom view showing details of a portion where a lens barrel is mounted.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a perspective view showing an adjustment rod.

FIG. 8 is a perspective view of a position adjusting and fixing device according to the embodiment, schematically illustrating a position adjusting and fixing device before a fixing member is assembled.

FIG. 9 is a bottom view of the position adjustment fixing device with the fixing member removed.

FIG. 10 is a perspective view of FIG. 8 at the time of assembly.

FIG. 11 is a sectional view taken along the line AA in FIG. 10;

FIG. 12 is a perspective view showing details of a portion where a lens barrel according to another embodiment is mounted.

FIG. 13 is an exploded perspective view of the fixing member of FIG. 12 before assembling.

FIG. 14 is a perspective view showing a state where the mounting bracket of FIG. 12 is removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed optical part 11 Support body 19 Lens barrel 19b Lens barrel 21 Mounting bracket 21c Notch

Claims (6)

[Claims] An adjusting member for adjusting a position of the lens barrel by moving the lens barrel in a required direction with respect to the support; and adjusting the lens barrel to the support in an adjustable state by the adjusting member. A holding member for holding the lens barrel by elastic force, applying a biasing force to the lens barrel in the same direction as the biasing direction by the elastic force of the holding member to fix the lens barrel to the support, and to the support A lens position adjusting / fixing device comprising a fixing member which is detachable from the lens. 2. The apparatus according to claim 1, wherein the holding member is fixed to the support before adjusting the position of the lens barrel, and the fixing member is fixed to the support after adjusting the position of the lens barrel. 2. The lens position adjusting and fixing device according to 1. 3. The lens position adjusting and fixing device according to claim 1, wherein the holding member is fixed by a screw, and the screw is removed after fixing by the fixing member. 4. The lens position adjusting and fixing device according to claim 1, wherein the holding member and the fixing member can be fixed and removed independently from the support. 5. The fixing device according to claim 4, wherein a notch is provided in the center of the holding member so as to straddle the fixing member, and the fixing member can be fixed to and detached from the support at the notch. Lens position adjustment fixing device. 6. The lens position adjusting and fixing device according to claim 4, wherein the holding member is removed after being fixed by the fixing member.