JPH07296405A - Driving device for object lens - Google Patents

Abstract

PURPOSE:To decrease the number of parts and to reduce a product cost by omitting a mounting cover. CONSTITUTION:This device is provided with an object lens supporter 6 which supports an object lens and driven in the up and down, right and left direction by a coil and a magnet, and a supporting member 1 which supports the object lens supporter 6 swinging freely in the up and down, right and left direction and is supported by a base 7. An upper end projecting part 1b projecting to an upper position of the object lens supporter 6 is formed at an upper end part of the supporting member 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable portion which is provided in an optical recording / reproducing apparatus and which supports an objective lens and is driven in a predetermined direction by a coil and a magnet, and supports the movable portion so as to be swingable. The present invention relates to an objective lens driving device having a supporting member supported by a base.

[0002]

2. Description of the Related Art As shown in FIG. 14, a conventional objective lens driving device reproduces information recorded on an optical recording disc (hereinafter referred to simply as "disc") 18 or records it on the disc 18. Objective lens 2
Is a device for driving the laser in the tracking and focus directions, and a semiconductor laser 17 is provided below the chassis 8. A base 7 is provided on the chassis 8.

The base 7 is provided with an objective lens support 6 as a movable portion via a support member 51.
As shown in FIG. 15, the objective lens support 6 is provided with an objective lens 2, a flexible substrate 3, and coils 5 and 5. Further, magnets 4 are provided at the left and right ends of the base 7 so as to face the coils 5 and 5.

As shown in FIG. 16, the support member 51 is provided in a hole in the central area of the objective lens support 6 and is connected to the objective lens support 6. A pin hole 9 is formed at one end of the support member 51, and the support pin 10 erected on the base 7 is fitted into the pin hole 9 and, as shown in FIGS. 17 and 18, , Support pin 1
By applying the adhesive 11 to the upper end of 0, the support member 51 is fixed to the chassis 8 via the support pin 10.

On the other hand, as shown in FIG. 15, the chassis 8 is provided with a mounting cover 52 for covering the objective lens support 6 and the base 7.

As shown in FIG. 19, the mounting cover 52 comes into contact with the mounting cover 52 when the objective lens support 6 moves upward due to a shock or the like. It serves to prevent the objective lens support 6 from moving further upward. This prevents the objective lens support 6 from coming off the support member 51 and prevents the objective lens 2 from coming into contact with the disc 18.

[0007]

However, in the above-mentioned conventional objective lens driving device, since the mounting cover 52 serves to prevent the objective lens support 6 from moving upward, the mounting cover 52 is an essential component. However, there is a problem that the cost is increased.

Further, since the support pin 10 and the support member 51 are fixed by the adhesive 11 applied to the upper portion of the support pin 10, there is a problem that a step of applying the adhesive 11 is required. ing.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to reduce the number of parts or the number of steps to reduce the product cost. To provide.

[0010]

In order to solve the above-mentioned problems, an objective lens driving device according to the present invention comprises a movable part which supports the objective lens and is driven in the vertical and horizontal directions by a coil and a magnet. In an objective lens driving device having a supporting member that supports the movable portion in a vertically and horizontally swingable manner and is supported by a base, an upper end portion of the supporting member projects to a position above the movable portion. It is characterized in that an upper end protruding portion is formed.

In order to solve the above-mentioned problems, an objective lens driving device according to a second aspect of the present invention is the objective lens driving device according to the first aspect, wherein the lower end portion of the supporting member is located below the movable portion. It is characterized in that a lower end projecting portion that projects up to is formed.

In order to solve the above-mentioned problems, an objective lens driving device according to a third aspect of the present invention is the objective lens driving device according to the first or second aspect, in which the upper end protruding portion or the lower end protruding portion of the supporting member, and The movable portion at the lower position or the upper position of the upper end protruding portion or the lower end protruding portion is
Both are characterized by being formed of a material having a shock absorbing property.

In order to solve the above-mentioned problems, an objective lens driving device according to a fourth aspect of the present invention supports a movable portion which is supported in the vertical and horizontal directions by a coil and a magnet, and a movable portion which moves the movable portion up and down. In the objective lens driving device having a support member that is swingably supported in the left-right direction and supported by the base, a screw for fixing the support member to the base is provided through the support member in the vertical direction. On the other hand, the head portion of the screw is characterized by a protruding member protruding to a position above the movable portion.

[0014]

According to the structure of claim 1, for example, when the objective lens driving device receives an impact and the movable part swings largely up and down, the movable part is provided at the upper end of the support member. Since the upper end projecting portion is formed so as to project up to the upper position, the upper surface of the movable portion hits the lower surface of the upper end protruding portion, and the upward swing of the movable portion is restricted.

Therefore, in the prior art, since the function of the upper end protruding portion was borne by the mounting cover, a large mounting cover was an essential component, but a small upper end protruding portion can be used instead. It is possible to omit the mounting cover. As a result, the number of parts can be reduced and the product cost can be reduced.

According to the structure of claim 2, for example,
When the objective lens driving device receives an impact and the movable part swings largely up and down, the lower end of the support member also has a lower end protruding part that protrudes to a position below the movable part. Therefore, the lower surface of the movable portion hits the upper surface of the lower end protruding portion, and the downward swing of the movable portion is restricted.

For this reason, in the prior art, when the movable part swings largely downward until it reaches the base, the movable part may come off from the support member. Since the protrusion is provided, the downward swing of the movable portion is restricted by this lower end protrusion. As a result, it becomes possible to prevent the movable portion from coming off the support member. Therefore, when the number of parts is reduced and the product cost is reduced, it is possible to prevent the movable part from being damaged.

According to the structure of claim 3, for example, when the objective lens driving device receives an impact and the movable part swings largely up and down, the upper end protruding part or the lower end protruding part of the support member is formed. , And the movable part at the lower position or the upper position of the upper end projecting part or the lower end projecting part are both made of a material having a shock absorbing property. The impact of is mitigated. Therefore, when the number of parts is reduced and the product cost is reduced, it is possible to prevent the movable part from being damaged.

According to the structure of claim 4, a screw for fixing the support member to the base when, for example, the objective lens driving device receives an impact and the movable part swings largely up and down. Is provided through the support member in the vertical direction, while the head of the screw is a protruding member that protrudes to a position above the movable portion, the upper surface of the movable portion abuts the lower surface of the movable member. Rocking in the upward direction is restricted.

Therefore, since the mounting cover can be omitted by substituting the function of the mounting cover for the projecting member, the number of parts can be reduced and the product cost can be reduced.

Further, conventionally, the support member is externally fitted and attached to the pin standing on the base, and the support member is fixed to the base by applying an adhesive to the head of the pin, but instead of the pin. Since the support member can be fixed to the base using screws, the work of applying the adhesive can be omitted. As a result, man-hours can be reduced and product cost can be reduced.

[0022]

【Example】

[Embodiment 1] The following will describe one embodiment of the present invention with reference to FIGS. For convenience of explanation, members having the same functions as the members shown in the drawings of the conventional example will be described with the same reference numerals.

As shown in FIG. 2, the objective lens driving device of this embodiment reproduces information recorded on an optical recording disc (hereinafter referred to simply as “disc”) 18 or records it on the disc 18. It is provided in an optical recording / reproducing device for recording.

The objective lens driving device drives the objective lens 2 in the tracking direction and the focus direction so that the light emitted from the semiconductor laser 17 provided below the chassis 8 can illuminate a predetermined track (not shown) of the disk 18. A base 7 is fixed to the chassis 8 above the chassis 8.

The base 7 is provided with the objective lens support 6 as a movable portion via the support member 1, and
As shown in FIG. 3, the objective lens support 6 is provided with an objective lens 2, a flexible substrate 3, and coils 5 and 5. The objective lens support 6 is made of a resin material having a shock absorbing property. Magnets 4 are provided at both ends of the base 7 so as to face the coils 5 and 5.

The supporting member 1 is made of a resin material having a shock absorbing property and, as shown in FIG. 4, is provided in a hole 6a formed in the central region of the objective lens supporting member 6. However, as will be described later, two points are supported by the inner walls on both the left and right sides of the hole 6a of the objective lens support 6 and are integrally connected. A pin hole 9 penetrates through a fixed column portion 1a formed at one end of the support member 1, and a support pin 10 erected on the base 7 is fitted into the pin hole 9 and As shown in FIGS. 1A and 1B, the support pin 1
By applying the adhesive 11 to the upper end of 0, the fixed column portion 1 a of the support member 1 is fixed to the chassis 8 via the support pin 10.

That is, when the supporting member 1 is attached to the objective lens support 6, the connecting portions 1c provided on both sides of the supporting member 1 are used to support the objective lens as shown in FIGS. The body 6 is attached by being inserted into the guide portion 6b formed in the hole 6a.

As a result, the objective lens support 6 is connected to the chassis 8 via the connecting portion 1c, the support member 1 and the support pin 10.
While the objective lens support 6 and the support member 1 are connected to each other, the connection between the objective lens support 6 and the support member 1 is performed as shown in FIG.
Therefore, the objective lens support 6 is moved in the left-right direction with respect to the support member 1, that is,
It is swingable in the tracking direction. Also, FIG.
As shown in (a) and (b), the support member 1 includes the fixed column portion 1
The connecting part with a is formed thin, and by this,
When the support member 1 and the objective lens support 6 are connected,
The objective lens support 6 including the objective lens 2 is swingable in the vertical direction, that is, the focus direction.

Further, in this embodiment, as shown in FIGS. 1A and 1B, the upper end of the fixed column portion 1a of the support member 1 projects outward and is located above the objective lens support 6. An upper end protruding portion 1b is formed so as to protrude up to. A gap is formed between the lower end surface of the upper end protruding portion 1b and the upper end surface of the objective lens support 6 so that they do not contact each other.

In the above structure, when reproducing the disk 18, as shown in FIG. 2, the semiconductor laser 17 is used.
The laser light emitted from the laser beam is focused by the objective lens 2 and applied to the disk 18, and the reflected light is received by a light receiving element (not shown). When the objective lens driving device is driven at the time of laser light irradiation, as shown in FIG. 3, by passing a current through the coils 5 and 5 provided on the objective lens support 6, a magnetic field is applied to each coil 5 and 5. The magnetic field and the magnetic fields of the magnets 4 move the objective lens support 6 vertically and horizontally, that is, in the focus direction and the tracking direction. This allows the disc 18
Can be read, error recovery, etc. can be performed.

As described above, in this embodiment, for example, when the objective lens driving device receives an impact and the objective lens support 6 swings largely up and down, the support member 1
Since an upper end projecting portion 1b projecting to a position above the objective lens support 6 is formed at the upper end of, the upper surface of the objective lens support 6 hits the lower surface of the upper end projecting portion 1b, and Swing in the upward direction is restricted.

Therefore, in the conventional case, the upper end protruding portion 1
Since the function of b was assigned to the mounting cover, a large mounting cover was an essential component, but this can be substituted for the small upper end protruding portion 1b, so that the mounting cover can be omitted. As a result, the number of parts can be reduced and the product cost can be reduced. Further, in the past, the coils 5 and 5 were sometimes brought into contact with the mounting cover, but in the present embodiment, since the mounting cover is eliminated, there is nothing that comes into contact with the coils 5 and 5.
This makes it possible to prevent impact and damage to the coils 5, 5.

The present invention is not limited to the above embodiments, but various modifications can be made within the scope of the present invention. For example, in the above embodiment, the upper end protruding portion 1b protrudes only from the upper end of the support member 1, but the present invention is not limited to this, and as shown in FIGS. 6 (a) and 6 (b),
It is also possible to form the lower end protruding portion 1d protruding from the lower end. The root portion of the lower end protruding portion 1d is shown in FIG.
As shown in (b), it is formed to be slightly thin and can be bent at its root. Then, when the support member 1 is attached to the objective lens support body 6, FIG.
As shown in (a), in the initial state, the support member 1 is attached to the objective lens support 6 in a state where the lower end protruding portion 1d is in a suspended state, and as shown in FIG. When this is set in, the lower end protruding portion 1d is bent. In this state, the integrated objective lens support 6 and support member 1 are fixed to the chassis 8 via the support pins 10.

With the above configuration, for example,
When the objective lens driving device receives an impact, the objective lens support 6
When a situation in which the upper and lower oscillates largely occurs, the lower end of the supporting member 1 is also formed with a lower end projecting portion 1d that projects to a position below the objective lens supporting body 6. Therefore, the objective lens supporting body The lower surface of 6 hits the upper surface of the lower end protruding portion 1d, and the downward swing of the objective lens support 6 is restricted.

Therefore, in the prior art, when the objective lens support 6 swings largely downward until it reaches the base 7, the objective lens support 6 may come off the support member 1. In the embodiment, since the lower end protrusion 1d is provided on the base 7, the downward swing of the objective lens support 6 is restricted by the lower end protrusion 1d. As a result, the vertical swing width is reduced, so that it is possible to prevent the objective lens support 6 from coming off the support member 1. Therefore, when the number of parts is reduced and the product cost is reduced, it is possible to prevent the objective lens support 6 from being damaged.

Further, in this embodiment, for example, when the objective lens driving device receives an impact and the objective lens support 6 swings largely up and down, the upper end protruding portion 1b and the lower end of the support member 1 are Since the objective lens support 6 at the lower position or the upper position of the projecting portion 1d and the upper end projecting portion 1b or the lower end projecting portion 1d is made of a resin material having shock absorbing property, the objective lens supporting body 6 is The impact at the time of contacting the upper end protruding portion 1b or the lower end protruding portion 1d is mitigated. Therefore, when the number of parts is reduced and the product cost is reduced, it is possible to prevent the objective lens support 6 from being damaged.

[Second Embodiment] The following will describe another embodiment of the present invention with reference to FIGS. 8 to 13.
For convenience of explanation, members having the same functions as the members shown in the drawings of the conventional example and the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the objective lens driving device of this embodiment, as shown in FIG.
As shown in FIG. 1, screws 1 are used instead of the support pins 10 of the first embodiment.
2 is used. The screw 12 is formed by a screw head 12a having a flat head as a projecting member, and the free end of the screw head 12a has the objective lens support 6 as shown in FIGS. 9 (a) and 9 (b). It has a size protruding upward. A screw hole 13a is formed in the chassis 13 so that the screw 12 can be screwed.

As described above, in this embodiment, for example, when the objective lens driving device receives a shock and the objective lens support 6 swings largely up and down, the support member 1
The screw 12 for fixing the screw to the base 7 is provided through the support member 1 in the vertical direction, while the head of the screw 12 is
Since the screw head 12a has a flat head projecting to a position above the objective lens support 6, the upper surface of the objective lens support 6 hits the lower surface of the screw head 12a having the flat head, and the objective lens support 6 Rocking in the upward direction is restricted.

Therefore, the screw head 12a having a flat head
Since the mounting cover can be omitted by substituting the function of the mounting cover, the number of parts can be reduced and the product cost can be reduced.

Further, conventionally, the support member 1 is externally fitted and attached to the pin 10 standing on the base 7, and the pin 10
Objective lens support 6 by applying an adhesive to the head of
Was fixed to the base 7, but a screw 1 that replaces the pin 10
Since the support member 1 can be fixed to the base 7 using 2,
The adhesive application work can be omitted. As a result, man-hours can be reduced and product cost can be reduced.

The present invention is not limited to the above embodiments, but various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, the screw head 12a as the protruding member has a larger area than a general one, but the present invention is not particularly limited to this, and for example, FIGS. As shown in a) and (b), it is possible to use a general screw 14 and interpose a relatively large washer 15 as a protruding member.

As a result, the usual commercially available screw 14 can be used, so that it can be manufactured at a low cost.

The above-mentioned screws are the same as those shown in FIGS.
As shown in (a) and (b), for example, a stepped screw 16 can be used. When the stepped screw 16 is used, the portion of the stepped screw 16 that comes into contact with the upper end surface of the fixed column portion 1 a is formed to be slightly larger than the screw hole, and between this contacted portion and the base 7. Fixed pillar part 1
a is clamped and fixed. Furthermore, the above-mentioned stepped screw 1
Similar to the screw head 12a, the uppermost head portion 6 has a size protruding above the objective lens support 6.

As a result, like the screw head 12a and the washer 15, it functions as a projecting member, while the frictional resistance between the objective lens support 6 and the stepped screw 16 is reduced, and the objective by screw tightening is reduced. Lens support 6
It is possible to prevent a wide range of deformation in the
Since 5 is not used, workability is also improved. Therefore, it is possible to further reduce the man-hours and reduce the product cost.

[0046]

As described above, the objective lens driving device according to the first aspect of the present invention has a structure in which the upper end of the support member is formed with the upper end protruding to the position above the movable part. .

As a result, for example, when the objective lens driving device receives an impact and the movable portion swings largely up and down, the upper surface of the movable portion hits the lower surface of the upper end protruding portion and moves upward in the movable portion. Rocking is restricted.

Therefore, in the prior art, since the function of the upper end protruding portion was laid on the mounting cover, a large mounting cover was an essential component, but a small upper end protruding portion can be used instead. It is possible to omit the mounting cover.

As a result, the number of parts can be reduced and the product cost can be reduced.

The objective lens driving device according to the invention of claim 2 is
As described above, in the objective lens driving device according to the first aspect, the lower end of the support member is also formed with the lower end protruding part that protrudes to a position below the movable part.

As a result, for example, when the objective lens driving device receives an impact and the movable portion swings largely up and down, the lower surface of the movable portion contacts the upper surface of the lower end protruding portion, and the movable portion is moved downward. Rocking is restricted.

For this reason, in the prior art, when the movable part swings largely downward until it reaches the base, the movable part may come off from the support member. Since the protrusion is provided, the downward swing of the movable portion is restricted by this lower end protrusion. As a result, it becomes possible to prevent the movable portion from coming off the support member.

Therefore, when the number of parts is reduced and the product cost is reduced, it is possible to prevent the movable part from being damaged.

The objective lens driving device according to the invention of claim 3 is
As described above, in the objective lens driving device according to claim 1 or 2, the upper end protruding portion or the lower end protruding portion of the support member,
The movable portion at the lower position or the upper position of the upper end projecting portion or the lower end projecting portion is made of a material having a shock absorbing property.

As a result, for example, when the objective lens driving device receives an impact and the movable part swings largely up and down, the impact at the time of contact with the upper end protrusion or the lower end protrusion of the movable part is generated. Will be alleviated.

Therefore, when the number of parts is reduced and the product cost is reduced, it is possible to prevent the movable part from being damaged.

The objective lens driving device according to the invention of claim 4 is
As described above, the screw for fixing the support member to the base is provided through the support member in the vertical direction, while the head of the screw is formed of the protruding member that protrudes to the position above the movable portion. It has a structure.

As a result, for example, when the objective lens driving device receives an impact and the movable part swings largely up and down, the upper surface of the movable part hits the lower surface of the projecting member and the movable part moves upward. Swing is restricted. Therefore, it is possible to omit the mounting cover by substituting the function of the mounting cover for the projecting member, so that it is possible to reduce the number of parts and reduce the product cost.

In the prior art, the support member is externally fitted and attached to the pin standing on the base, and the support member is fixed to the base by applying an adhesive to the head of the pin, but instead of the pin. Since the support member can be fixed to the base using screws, the work of applying the adhesive can be omitted.

As a result, the number of steps can be reduced and the product cost can be reduced.

[Brief description of drawings]

1A and 1B show an objective lens driving device according to an embodiment of the present invention, in which FIG. 1A is a perspective view showing a structure in which a supporting member and an objective lens support are partially cut away, and FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 2 is a schematic side view showing a configuration of the objective lens driving device.

FIG. 3 is a perspective view showing an overall structure of the objective lens driving device.

FIG. 4 is an exploded perspective view showing a state in which an objective lens support body and a support member, which are integrated in the objective lens drive device, are attached to a base via a pin.

5A and 5B are cross-sectional views showing a state in which the support member and the objective lens support body are integrally connected, wherein FIG. 5A is a state before connection and FIG. 5B is a state after connection.

6A and 6B show a structure of an objective lens driving device in which a lower end protruding portion is provided on the supporting member, FIG. 6A is a perspective view showing a part of a main portion cut away, and FIG. 6B is a perspective view of FIG. It is a BB line sectional view.

FIG. 7 is a cross-sectional view showing a state in which a supporting member provided with a lower end protruding portion and an objective lens supporting body are integrally connected,
(A) is a state before connection, and (b) is a state after connection.

FIG. 8 is an exploded perspective view showing an objective lens driving device according to another embodiment of the present invention, showing a state in which an integrated objective lens support and a supporting member are attached to a base with screws having a flat head. It is a figure.

FIG. 9 shows a state in which the above-mentioned integrated objective lens support and support member are attached to a base with a screw having a flat head, and FIG. FIG. 1B is a sectional view showing a part of the main part cut away.

FIG. 10 is a view showing an objective lens driving device according to still another embodiment of the present invention, showing a state in which an integrated objective lens supporting member and supporting member are attached to a base with a general screw with a washer interposed. It is an exploded perspective view shown.

FIG. 11 shows a state in which the above-mentioned integrated objective lens support and support member are attached to a base with a general screw with a washer interposed, and FIG. The perspective view shown in FIG. 1B is a cross-sectional view showing a part of the main part cut away.

FIG. 12 is an exploded perspective view showing an objective lens driving device according to still another embodiment of the present invention, showing a state in which an integrated objective lens support and a supporting member are attached to a base with stepped screws. is there.

FIG. 13 is a perspective view showing a state in which the integrated objective lens support and support member are attached to a base with stepped screws, and FIG.
(B) is sectional drawing which notches and shows a principal part partially.

FIG. 14 is a schematic side view showing a configuration of an objective lens driving device, showing a conventional example.

FIG. 15 is a perspective view showing an overall structure of the objective lens driving device.

FIG. 16 is an exploded perspective view showing a state in which an objective lens support body and a support member, which are integrated in the objective lens drive device, are attached to a base via a pin.

FIG. 17 is a cutaway perspective view of essential parts showing a state where the integrated objective lens support and support member are attached to a base via pins.

18 is a cross-sectional view taken along the line CC in FIG.

FIG. 19 is a side sectional view showing a state in which an objective lens support and a support member are covered with a mounting cover.

[Explanation of reference numerals] 1 support member 1a fixed column portion 1b upper end protruding portion 1d lower end protruding portion 2 objective lens 4 magnet 5 coil 6 objective lens support (movable portion) 7 base 12 screw 12a screw head (projecting member) 15 washer ( Projecting member) 16 stepped screw (projecting member)

Claims (4)

[Claims] 1. A movable part which supports an objective lens and is vertically and horizontally driven by a coil and a magnet, and a supporting member which is swingably supported in the vertical and horizontal directions and is supported by a base. In the objective lens driving device having the above-mentioned, the upper end portion of the supporting member is formed with an upper end projecting portion that projects to a position above the movable portion. 2. The objective lens driving device according to claim 1, wherein the lower end of the supporting member is also formed with a lower end projecting part projecting to a position below the movable part. 3. The upper end projecting portion or the lower end projecting portion of the support member, and the movable portion at a lower position or an upper position of the upper end projecting portion or the lower end projecting portion are both formed of a material having a shock absorbing property. The objective lens drive device according to claim 1, wherein 4. A movable part which supports an objective lens and is vertically and horizontally driven by a coil and a magnet, and a support member which is swingably supported in the vertical and horizontal directions and is supported by a base. In the objective lens driving device having the above-mentioned, a screw for fixing the supporting member to the base is provided through the supporting member in the vertical direction, while the head of the screw projects to a position above the movable portion. An objective lens driving device comprising a member.