JP3462274B2 - Optical disk drive - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device equipped with a pair of upper and lower optical heads used for reading or recording data recorded on a double-sided access type optical disk.

[0002]

2. Description of the Related Art Generally, in the main body of an optical disk device, a system shown in FIG. 9A is adopted as a drive guide for an optical head. That is, the guide shafts 2 and 3 are arranged in parallel on both sides of the optical head main body 1a of the optical head 1, and the guide shafts 2 and 3 guide the access operation of the optical head main body 1a. Here, since a low-friction and highly accurate positioning is required during the access operation of the optical head 1, the contact portion between the optical head main body 1a and the two parallel guide shafts 2 and 3 provided on both sides of the optical head main body 1a. At least 3 sets of 6 bearings, 2 sets 4 on one side of the optical head body 1a and 1 set on the other side so that the guide shafts 2 and 3 are sandwiched from above and below at a certain angle. A 6-point support structure in which 4 is used is adopted.

The above three sets of six bearings 4 are assembled on the side of the optical head body 1a. Here, the optical head body 1a comes into contact with the guide shaft 2 on one side 2
The supporting shafts of the four bearings 4 are completely fixed to the optical head body 1a side by means such as press fitting. As a result, the optical head body 1a has only the degree of freedom around the y-axis (track direction), which is the axial direction of the guide shaft 2. At this time, the degree of freedom around the y-axis is further restricted by the set of two bearings 4 in contact with the guide shaft 3 on the other side of the optical head body 1a, and the degree of freedom is limited to the y-axis direction.

However, if all the bearings 4 are mechanically completely fixed to the optical head main body 1a by means such as press fitting, manufacturing errors during machining of the respective constituent parts of the optical head main body 1a and between the respective parts will occur. When the optical head body 1a is assembled to the optical disk device body due to an accumulated error (tolerance) caused by the assembly error etc. of the optical head body 1a, the bearing 4 on the side of the optical head body 1a and the parallel guide shafts 2 and 3 are partially contacted with each other. There is a problem that the assembly error is likely to occur.

Therefore, a set 2 is conventionally mounted on the contact portion between the optical head body 1a and the parallel guide shaft 3 on one side.
A pressing mechanism that elastically presses one of the bearings 4 arranged on the lower side of the bearings 4 against the optical head body 1a side via a spring 5 (see FIG. 9B) or the like ( By adopting an elastic support structure), an assembly error such as an accumulated error between the optical head body 1a and the parallel guide shafts 2 and 3 is absorbed.

As a double-sided access type optical disk device, a structure shown in FIG. 9B is known.
In this, an optical disk 6 rotating in a horizontal plane is removably mounted in a main body of an optical disk device, and optical heads 7 and 8 are arranged above and below the optical disk 6 in between.

The data recording surface on the upper surface side of the optical disk 6 is accessed by the downward upper optical head 7 arranged on the upper side of the optical disk 6, and the upward downward surface arranged on the lower side of the optical disk 6. The data recording surface on the lower surface side of the optical disk 6 is accessed by the optical head 8.

[0008]

By the way, the upper and lower optical heads 7 and 8 of the above-mentioned double-sided access type optical disk device are to be solved.
When the optical head main bodies 1a are shared, there are the following problems. For example, when the lower optical head 8 is reversed in the vertical direction and applied as the upper optical head 7, FIG.
As shown in (B), the pressurizing mechanism for elastically supporting the bearing 4 via the spring 5 is arranged above the guide shaft 3. In this state, the weight of the optical head body 1a, which did not act on the lower optical head 8, acts on the spring 5 of the pressurizing mechanism.

That is, when the optical head body 1a of the lower optical head 8 is driven while being guided along the guide shafts 2 and 3, the weight of the drive portion of the optical head body 1a is M.
[Kg], the impact force set according to the product specifications is S
If [G], the pressurizing force Fy of the spring 5 of the pressurizing mechanism is
Is as shown in the following formula 1. Here, g is the gravitational acceleration, and K is the resonance magnification of the device.

[0010]

[Equation 1] Is calculated. The optical head body 1a of the lower optical head 8
When the above is used as it is as the upper optical head 7, the pressurizing force Fy ′ is as shown in the following Expression 2.

[0011]

[Equation 2] Becomes Therefore, as is clear from the equation (2), when the optical head body 1a of the lower optical head 8 is used as it is as the upper optical head 7, the spring 5 of the pressurizing mechanism corresponds to the weight of the optical head body 1a. The required pressurization is increased.

Therefore, when the optical head body 1a for the lower optical head 8 is used as it is as the upper optical head 7, the constraint around the y-axis becomes loose, and the upper optical head 7 becomes weak against impact. In addition, it is easy to take off the wheel and the frequency characteristic may be deteriorated.

Therefore, in order to solve such a problem, separate optical head bodies 1a are manufactured by using the upper and lower optical heads 7 and 8 as dedicated parts, respectively, or the weight of the optical head body 1a is taken into consideration. The design of the pressure mechanism can be considered as a countermeasure.

However, when separate optical head main bodies 1a are manufactured by using the upper and lower optical heads 7 and 8 as dedicated parts, respectively, the number of parts increases and the cost increases.

Further, in consideration of the impact applied to the optical head main body 1a used as the upper optical head 7, when designing a pressurizing mechanism capable of withstanding it, the spring 5 of the pressurizing mechanism of the optical head main body 1a can be freely designed. And narrowing the degree of freedom in selecting the bearing 4. Further, in this case, the weight of the entire optical head body 1a increases, which is not preferable in consideration of wear of the bearing 4.

The present invention has been made in view of the above circumstances. It is possible to manufacture the optical head main bodies placed above and below with a double-sided access type optical disc interposed therebetween as a common component, and the components of the entire optical disc device. It is an object of the present invention to provide an optical disk device that can reduce the number and reduce the cost.

[0017]

According to a first aspect of the present invention, there is provided a pair of optical head bodies provided above and below with an optical disc interposed therebetween.
A pair of left and right parallel guide shafts for guiding an access operation in which the upper and lower optical head main bodies independently move between the inner and outer circumferences of the recording surface of the optical disc, and a pair of upper and lower support elements on one side of the left and right guide shafts. Mounted on the optical head body while sandwiching between the first support means mounted on the optical head body and the other side of the left and right parallel guide shafts between a pair of upper and lower support elements. And the one supporting element is fixedly held in contact with the guide shaft at all times, and the other supporting element is elastically pressed against the guide shaft to be parallel to the optical head main body. An optical disk device comprising: a second supporting means formed by an elastic supporting element that absorbs an assembly error between the guide shaft and the guide shaft;
An optical head constituent unit that constitutes a main part of the optical head main body by a common part in which parts other than the second supporting means in the optical head main body are shared between the upper and lower optical head main bodies of the optical disc; The support position of the fixed support element of the second support means, the mounting position of the fixed support element in the upper optical head arranged above the optical disc and the fixing in the lower optical head arranged below the optical disc. A guide unit selectively and removably attached to the optical head constituting unit at a mounting position of a supporting element, a mounting position of the elastic supporting element in an upper optical head arranged above the optical disc, and a mounting position of the optical disc. The elastic supporting element is selectively removed at the mounting position of the elastic supporting element in the lower optical head arranged on the lower side. Those provided with the elastic supporting element attachment means for attaching the ability.

According to a second aspect of the present invention, a pair of optical head main bodies provided above and below the optical disk are guided, and an access operation in which the upper and lower optical head main bodies move independently between the inner and outer circumferences of the recording surface of the optical disk. A pair of left and right parallel guide shafts, and one of the left and right guide shafts sandwiched between a pair of upper and lower support elements, the first support means mounted on the optical head body, and the left and right A fixed support element mounted on the optical head main body in a state where the other side of the parallel guide shaft is sandwiched between a pair of upper and lower support elements, and the one support element is always held in contact with the guide shaft. , The other supporting element is elastically pressed against the guide shaft to absorb an assembly error between the optical head body and the parallel guide shaft. Therefore, in the optical disk device including the second supporting means formed as described above, the parts other than the second supporting means in the optical head main body are shared by the common parts common between the upper and lower optical head main bodies of the optical disk. An attachment position of the fixed support element in an upper optical head provided on the upper side of the optical disc, including an optical head constituent unit that constitutes a main part of the optical head main body and a support portion of the fixed support element of the second support means. And a guide unit selectively and removably attached to the optical head constituent unit at the mounting position of the fixed supporting element in the lower optical head arranged below the optical disc, and the optical head constituent unit. The guide unit is provided at the joint with the guide unit and is different from the guide unit for the optical head constituting unit. Positioning means for contacting the guide unit at a proper mounting position by abutting from the direction, a mounting position of the elastic support element in the upper optical head arranged on the upper side of the optical disc, and a lower position of the optical disc. The elastic support element mounting means for selectively and removably mounting the elastic support element at the mounting position of the elastic support element in the lower optical head.

According to a third aspect of the present invention, a pair of optical head main bodies provided above and below with an optical disc interposed therebetween, and an access operation in which the upper and lower optical head main bodies independently move between the inner and outer circumferences of the recording surface of the optical disc are guided. A pair of left and right parallel guide shafts, and one of the left and right guide shafts sandwiched between a pair of upper and lower fixed bearings. A fixed bearing that is mounted on the optical head main body while sandwiching the other side of the parallel guide shaft between a pair of upper and lower bearings, and that one of the bearings is always held in contact with the guide shaft. A bearing is elastically pressed against the guide shaft to absorb an assembly error between the optical head body and the parallel guide shaft. In an optical disc device comprising a second support means formed by an elastic support bearing, components other than the second support means in the optical head body are shared between the upper and lower optical head bodies of the optical disc. Attachment of the fixed bearing in an upper optical head arranged above the optical disc, comprising an optical head constituent unit that constitutes a main part of the optical head main body by parts, and a fixed bearing support portion of the second supporting means. A bearing unit selectively and removably attached to the optical head constituent unit at a position and a mounting position of the fixed bearing in the lower optical head arranged on the lower side of the optical disc, and on the upper side of the optical disc. The mounting position of the elastic support bearing in the arranged upper optical head, Elastic support bearing mounting means for selectively detachably mounting the elastic support bearing at the mounting position of the elastic support bearing in the lower optical head arranged below the disk, the optical head constituting unit and the bearing unit. And a positioning means which is provided at a joint part of the optical head and which abuts the bearing unit from the two different directions with respect to the optical head constituting unit to position the bearing unit at a regular mounting position.

According to a fourth aspect of the present invention, a pair of optical head main bodies are provided above and below the optical disk, and an access operation for moving the upper and lower optical head main bodies independently between the inner and outer circumferences of the recording surface of the optical disk is guided. A pair of left and right parallel guide shafts, and one of the left and right guide shafts sandwiched between a pair of upper and lower support elements, the first support means mounted on the optical head body, and the left and right A fixed support element mounted on the optical head main body in a state where the other side of the parallel guide shaft is sandwiched between a pair of upper and lower support elements, and the one support element is always held in contact with the guide shaft. , The other supporting element is elastically pressed against the guide shaft to absorb an assembly error between the optical head body and the parallel guide shaft. Therefore, in the optical disk device including the second supporting means formed as described above, the parts other than the second supporting means in the optical head main body are shared by the common parts common between the upper and lower optical head main bodies of the optical disk. An optical head constituting unit that constitutes a main part of an optical head main body, an attachment position of the fixed support element in an upper optical head arranged above the optical disc, and a lower optical head arranged in a lower side of the optical disc. Fixed support element mounting means for selectively and removably mounting the fixed support element depending on the mounting position of the fixed support element, the mounting position of the elastic support element in the upper optical head arranged above the optical disc, and the optical disc. The elastic support element is selected depending on the mounting position of the elastic support element in the lower optical head arranged on the lower side of To those provided with the elastic supporting element mounting means for mounting detachably.

[0021]

According to the first aspect of the invention, when the optical head body is used as the upper optical head, the guide unit is elastically supported with respect to the optical head constituting unit in a state corresponding to the mounting position of the fixed supporting element in the upper optical head. Each element is mounted in a state corresponding to the mounting position of the elastic support element in the upper optical head, and when the main body of the optical head is used as the lower optical head, the guide unit is arranged with respect to the optical head constituting unit. In the state corresponding to the mounting position of the fixed supporting element in, and by mounting the elastic supporting element in the state corresponding to the mounting position of the elastic supporting element in the lower optical head, the double-sided access type optical disc is sandwiched between the upper and lower sides. The installed optical head can be shared by a single product.

According to the second aspect of the present invention, when the optical head body is used as the upper optical head, the guide unit is elastically supported with respect to the optical head constituting unit in a state corresponding to the mounting position of the fixed supporting element in the upper optical head. Each element is mounted in a state corresponding to the mounting position of the elastic support element in the upper optical head, and when the main body of the optical head is used as the lower optical head, the guide unit is arranged with respect to the optical head constituting unit. In the state corresponding to the mounting position of the fixed supporting element in, and by mounting the elastic supporting element in the state corresponding to the mounting position of the elastic supporting element in the lower optical head, the double-sided access type optical disc is sandwiched between the upper and lower sides. The installed optical head can be shared by a single product. Is obtained so as to position the guide unit in the mounting position of the normal to the guide unit is brought into contact from two different directions with respect to the optical head configuration unit by the positioning means of the junction of the Tsu bets.

According to the third aspect of the invention, when the optical head body is used as the upper optical head, the elastic support bearing is in a state in which the bearing unit is made to correspond to the mounting position of the fixed bearing in the upper optical head with respect to the optical head constituting unit. And the elastic support bearings in the upper optical head in a state corresponding to the mounting position,
When the main body of the optical head is used as the lower optical head, the elastic support bearing is elastic in the lower optical head with the bearing unit corresponding to the mounting position of the fixed bearing in the lower optical head with respect to the optical head constituent unit. By mounting the support bearings in correspondence with the mounting positions of the support bearings, it is possible to share the optical heads that are placed above and below with the optical disk compatible with double-sided access in common in a single product. The bearing unit is different from the optical head constituent unit depending on the positioning means of the joint with
The bearing unit is abutted from the direction so that the bearing unit is positioned at the proper mounting position.

In the invention of claim 4, when the optical head main body is used as the upper optical head, the fixed supporting element is made elastic with respect to the optical head constituting unit in a state corresponding to the mounting position of the fixed supporting element in the upper optical head. The supporting elements are mounted in a state corresponding to the mounting positions of the elastic supporting elements in the upper optical head, and when the optical head main body is used as the lower optical head, the fixed supporting element is mounted on the lower side of the optical head constituting unit. By mounting the elastic support element in the state corresponding to the mounting position of the fixed support element in the optical head and the elastic support element in the state corresponding to the mounting position of the elastic support element in the lower optical head, a double-sided access compatible optical disk is sandwiched. The optical heads installed above and below can be shared by a single product.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7B. FIG. 2 shows an optical disk cartridge 11 used in a double-sided access type optical disk device of this embodiment. Access windows 13A and 13B for recording / reproducing are formed on both sides of an end (indicated by an arrow X in FIG. 2) of an optical disc cartridge 16 of the optical disc cartridge 11 in an insertion direction to be described later. ing. The access windows 13A and 13B are configured to be opened and closed by a shutter 12 that is a double-sided integrated type.

An optical disk 15 compatible with double-sided access is housed inside the cartridge body 14.
This optical disc 15 has two discs bonded together.
The information recording surfaces of the surface B and the surface B are formed.

Next, a double-sided access type optical disk device 16 using the optical disk cartridge 11 will be described with reference to FIG. This optical disk device 16
An insertion / removal opening 21 for inserting / removing the optical disk cartridge 11 is formed on the front panel of the apparatus body 20. Further, an opening / closing door (not shown) that opens / closes the insertion / removal opening 21 by the insertion / removal operation of the cartridge body 14 is provided on the inner surface side of the front panel.

Further, FIG.
As shown in FIG. 3, a spindle motor 22 as a disk drive means is arranged. The spindle motor 22 has a turntable 23 having magnetic force generating means for magnetically attracting and holding a metallic hub portion 15A provided at the center of rotation of the optical disc 15 and a positioning portion for the optical disc 15.
And a motor 24 for driving the turntable 23. Then, the optical disk 15 inserted in the apparatus main body 20 is set on the turntable 23 of the spindle motor 22 with the center of rotation aligned, and is positioned and fixed by the clamp mechanism 25 shown in FIG.

Further, the optical disk cartridge main body 14 inserted from the insertion / removal opening 21 is taken in the apparatus main body 20 substantially parallel to the insertion direction, and the optical disk 15 is mounted on the turntable 23 of the spindle motor 22. A loading mechanism (not shown) for ejecting the optical disk cartridge body 14 in the apparatus body 20 to the insertion / removal opening 21 is built in.

Further, in the main body 20 of the apparatus, the lower optical head 18 which is close to the lower surface of the optical disk 15 through the access window portions 13A and 13B of the optical disk cartridge 11 is provided.
A and the upper optical head 1 near the upper surface of the optical disk 15
8B is provided. Here, the upper optical head 18B
Are arranged to face the lower optical head 18A at a distance, and the lower optical head 18A faces upward and the upper optical head 18A faces upward.
B is attached downward.

Further, the lower optical head 18A and the upper optical head 18B are adapted to reciprocate in the radial direction of the optical disk 15 via the respective access mechanisms 26A and 26B.

Here, in the access mechanism 26A of the lower optical head 18A, as shown in FIG. 4, a pair of left and right parallel guide shafts 31, 3 arranged on both sides of the lower optical head 18A.
2 and a pair of left and right magnetic circuits (not shown) using a linear motor or the like for applying thrust to the optical head 18A.

Similarly to the access mechanism 26A of the lower optical head 18A, the access mechanism 26B of the upper optical head 18B also has a pair of left and right parallel guide shafts 33, 34 arranged on both sides of the upper optical head 18B. 1 shows only one guide shaft 34) and a pair of left and right magnetic circuits (not shown).

When the lower access mechanism 26A is operating, the lower optical head 18A is guided by the left and right parallel guide shafts 31 and 32 so as to move between the inner and outer circumferences of the recording surface of the optical disk 15 by a magnetic circuit. It has become. Similarly, when the upper access mechanism 26B operates, the upper optical head 18B moves the left and right parallel guide shafts 33,
A magnetic circuit is guided by the magnetic disk 34 to move between the inner and outer circumferences of the recording surface of the optical disk 15.
Thereby, the lower optical head 18A and the upper optical head 1
8B performs an access operation from the inner circumference to the outer circumference of both sides of the optical disk 15 to record / reproduce information.

Further, the first support means 42 is provided at one side of the optical head main body 41 of the lower optical head 18A and the upper optical head 18B, for example, at the contact portion with the left guide shafts 31 and 33 on the left side. On the right side, which is the other side, second support means 43 are provided at the contact portions with the right guide shafts 32 and 34, respectively.

Here, two sets of four bearings (supporting elements) 44 are attached to the first supporting means 42 so as to sandwich the guide shaft 31 (or 33) from above and below at a certain angle, and the second supporting means 42 is mounted. A set of two bearings 44 is mounted on the shaft 43 so as to sandwich the guide shaft 32 (or 34) from above and below at a certain angle. Therefore, the optical head bodies 41 of the lower optical head 18A and the upper optical head 18B each have a six-point support structure supported by three sets of six bearings 44.

The two bearing pairs (four bearings 44) of the first supporting means 42 are arranged in the axial direction of the guide shaft 31 (or 33) in the optical head main body 41 as shown in FIG. 5B. They are arranged at both ends in the (access direction). Then, the first supporting means 4
4 bearings 2 are the support shafts 4 of each bearing 44.
5 are formed by fixed bearings (fixed support elements) 46 fixed to the optical head main body 41 by means such as press fitting.

Further, one bearing pair (two bearings 44) of the second supporting means 43 is shown in FIGS. 5 (A) and 5 (B).
As shown in, the optical head main body 41 is arranged at a substantially central position between both ends of the guide shaft 32 (or 34) in the axial direction (access direction). Of the two bearings 44 of the second support means 43, the bearing 44 disposed on the upper side is a fixed bearing (fixed support) in which the support shaft 45 of the bearing 44 is fixedly held on the optical head main body 41 side. The bearing 44, which is formed by the element) 46 and is arranged on the lower side, is elastically pressed against the guide shaft and
1, 32, 33, 34 are formed by elastic support bearings (elastic support elements) 47 that absorb assembly errors.

In the optical head body 41, parts other than the fixed bearing 46 and the elastic support bearing 47 of the second support means 43 are shared by the upper and lower optical head bodies 41 of the optical disk 15 by using common parts. 41
Of the optical head constituting unit, a bearing unit (guide unit) 49 for selectively detachably attaching the fixed bearing 46 to the optical head constituting unit 48, and an elastic support bearing 47 for the optical head constituting unit 48. And elastic support element attachment means 50 for selectively releasably attaching the.

Here, the bearing unit 49 and the elastic support bearing 4 for the optical head constituting unit 48 are provided.
The mounting positions of 7 are as described below when the optical head constituting unit 48 is used as the optical head main body 41 of the lower optical head 18A and when it is used as the optical head main body 41 of the upper optical head 18B. The optical head component unit 48 and the bearing unit 49 and the elastic support bearing 47 are changed.
Are selectively and removably attached as needed.

Further, the optical head constituting unit 48 is provided with a unit mounting portion 51 for removably mounting the bearing unit 49 and a mounting base 52 for removably mounting the elastic support bearing 47.

Further, the unit mounting portion 51 of the optical head constituting unit 48 is provided with projections (positioning means) 53 and 54 for positioning in the vertical direction and the horizontal direction at the joint with the bearing unit 49. Here, the vertical positioning projections 53 are arranged at the joints with the upper and lower edges of the bearing unit 49, and the left and right positioning projections 54 are joined with the left and right side parts of the bearing unit 49. It is located in the section. When mounting the bearing unit 49 on the unit mounting portion 51, the upper and lower edges of the bearing unit 49 are brought into contact with the positioning projections 53 in the vertical direction, and the left and right side portions of the bearing unit 49 are fixed. Left-right positioning protrusion 54
The bearing unit 49 is positioned at a regular mounting position by abutting against.

6A to 6C show the bearing unit 49. The unit main body 55 of the bearing unit 49 is provided with a base portion 56 at the bottom and a bearing support portion 57 protruding from the base portion 56. Here, the support shaft 45 of the bearing 44 is fixed to the bearing support portion 57 by means such as press fitting.

Further, the base portion 56 is provided with a pair of bolt mounting portions 58a and 58b. The bolt mounting portions 58a and 58b are arranged above and below the base 56 in a position symmetrical with respect to the center of the bearing unit 49. The bolt mounting portions 58a and 58b are formed with insertion holes 60 for the fixing bolts 59, respectively.

A bearing unit 49 is fixed to the unit mounting portion 51 of the optical head constituting unit 48.
A bolt hole for the book fixing bolt 59 is formed. When the optical head constituting unit 48 is assembled as the optical head main body 41 of the lower optical head 18A, FIG.
As shown in (A) and (B), the bearing unit 49 is attached to the unit mounting portion 51 of the optical head constituting unit 48 with the bearing 44 of the bearing unit 49 facing upward.

When the optical head constituting unit 48 is assembled as the optical head main body 41 of the upper optical head 18B, the optical head constituting unit 48 is arranged as shown in FIGS. 6 (A) and 6 (A), as shown in FIGS. , (B), the bearing unit 49 is turned over by 180 ° and the bearing 44 of the bearing unit 49 faces downward, and the bearing unit 49 is attached to the unit mounting portion 51 of the optical head constituting unit 48. It can be installed.

Further, the elastic support bearing 47 has a leaf spring-like elastic support arm 60 for elastically supporting the bearing 44.
Is provided. The support shaft 45 of the bearing 44 is attached to the tip of the elastic support arm 60. Further, at the base end portion of the elastic support arm 60, a pedestal portion 61 that is detachably attached to the attachment base 52 of the optical head constituting unit 48 is provided.

Here, a pair of upper and lower support arm mounting portions 62, 63 are mounted on the mounting base 52 of the optical head constituting unit 48.
Is provided. In FIG. 5A, the pedestal portion 61 of the elastic support arm 60 is attached to the lower support arm attachment portion 63 when the optical head constituting unit 48 is assembled as the optical head main body 41 of the lower optical head 18A. The pedestal portion 6 of the elastic support arm 60 is attached to the upper support arm attachment portion 62 when the optical head constituent unit 48 is assembled as the optical head body 41 of the upper optical head 18B.
1 can be attached.

Therefore, the following effects can be obtained with the above-mentioned structure. That is, the optical head main body 41 is provided with a common component in which parts other than the fixed bearing 46 and the elastic support bearing 47 of the second supporting means 43 are shared between the upper and lower optical head main bodies 41 of the optical disk 15.
1 is provided with the optical head constituting unit 48, and the optical head constituting unit 48 is provided with the unit mounting portion 51 of the bearing unit 49 and the mounting base 52 of the elastic support bearing 47. Since the bearing unit 49 and the elastic support bearing 47 are selectively and removably attached as appropriate, the optical head constituting unit 48 is used as the optical head main body 41 of the lower optical head 18A and the upper optical head. The mounting position of the bearing unit 49 and the elastic support bearing 47 with respect to the optical head constituting unit 48 can be changed depending on whether the optical head main body 41 of 18B is used.

When the optical head constituting unit 48 is assembled as the optical head main body 41 of the lower optical head 18A, the bearing 44 of the bearing unit 49 faces upward as shown in FIGS. 6 (A) and 6 (B). In this state, the bearing unit 49 is attached to the unit mounting portion 51 of the optical head constituting unit 48, and the pedestal portion 61 of the elastic supporting arm 60 is attached to the lower supporting arm attaching portion 63 of the attaching base 52 of the optical head constituting unit 48. To be

When the optical head constituting unit 48 is assembled as the optical head main body 41 of the upper side optical head 18B, the optical head constituting unit 48 is shown in FIG. 6 (A) as shown in FIGS. 7 (A) and 7 (B). , (B), the bearing unit 49 is turned over by 180 ° and the bearing 44 of the bearing unit 49 faces downward, and the bearing unit 49 is attached to the unit mounting portion 51 of the optical head constituting unit 48. While being attached, the pedestal portion 61 of the elastic support arm 60 is attached to the upper support arm attachment portion 62 of the attachment base 52 of the optical head component unit 48.

Therefore, even when the optical head constituting unit 48 is assembled as the optical head main body 41 of the upper optical head 18B, the optical head constituting unit 48 is the optical head main body 41 of the lower optical head 18A as shown in FIG. Since the elastic support bearing 47 can be arranged on the lower side of the guide shaft 34 in the same manner as in the case of assembling as shown in FIG.
It is possible to secure the same accuracy and band as those of the optical head main body 41 of A.

Therefore, the optical heads 18A, 1 installed above and below with the optical disk 15 compatible with double-sided access interposed therebetween.
Since the 8B can be shared by a single product, the optical head body 4 is placed above and below with the optical disc compatible with double-sided access interposed therebetween.
1 can be manufactured as a common component, and the number of components of the optical disc device 16 as a whole can be reduced to reduce the cost.

Further, the bearing unit 49 can be moved from two different directions with respect to the optical head constituting unit 48 by the positioning projections 53 and 54 in the vertical direction and the horizontal direction of the joint portion between the optical head constituting unit 48 and the bearing unit 49. Since the bearing unit 49 is brought into contact with each other to position the bearing unit 49 at the proper mounting position, even if the fixed bearing 46 of the second supporting means 43 can be removed from the optical head constituting unit 48, It is possible to prevent a decrease in the mounting accuracy of the fixed bearing 46.

The present invention is not limited to the above embodiment. For example, as shown in FIG. 8, the fixed bearing 46 of the second supporting means 43 is attached to the optical head constituting unit 48.
A pair of upper and lower fixed bearing mounting portions 71 for removably mounting the support shaft 45 by means such as press fitting or screwing.
72 may be provided. In this case, when the optical head constituent unit 48 is assembled as the optical head main body 41 of the lower optical head 18A, the optical head constituent unit 48 with the bearing 44 of the fixed bearing 46 facing upward as shown by the solid line in FIG. Fixed bearing mounting part 71 on the upper side of
The support shaft 45 of the fixed bearing 46 is attached to the. Further, when the optical head constituting unit 48 is assembled as the optical head main body 41 of the upper optical head 18B, the fixed bearing 46 as shown by the phantom line in FIG.
The support shaft 45 of the fixed bearing 46 is attached to the fixed bearing attachment portion 71 on the lower side of the optical head constituting unit 48 in a state where the bearing 44 is directed downward.

Even in this case, even when the optical head constituting unit 48 is assembled as the optical head main body 41 of the upper optical head 18B as in the above-described embodiment, the optical head constituting unit 48 is the optical head main body of the lower optical head 18A. Elastic support bearings 47 as if assembled as 41
Can be arranged on the lower side of the guide shaft 34, so that the same accuracy and band as the optical head main body 41 of the lower optical head 18A can be secured with respect to the optical head main body 41 of the upper optical head 18B.

Therefore, the optical heads 18A, 1 installed above and below with the optical disk 15 compatible with double-sided access interposed therebetween.
Since the 8B can be shared by a single product, the optical head body 4 is placed above and below with the optical disc compatible with double-sided access interposed therebetween.
1 can be manufactured as a common component, and the number of components of the optical disc device 16 as a whole can be reduced to reduce the cost. Further, in this embodiment, since the bearing unit 49 of the above embodiment can be omitted, the structure of the entire apparatus can be further simplified.

Further, the bearing unit 49 and the elastic support bearing 47 may be combined into one unit so as to be replaceable. In this case, the optical head constituent unit 48
It is possible to omit the support arm attachment parts 62 and 63 of FIG. Furthermore, it goes without saying that various modifications can be made without departing from the scope of the present invention.

[0059]

As described above in detail, according to the present invention,
It is possible to manufacture the optical head main bodies that are installed above and below with the double-sided access type optical disc interposed therebetween as a common component, and it is possible to reduce the number of components of the entire optical disc device and reduce the cost.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a main part of a double-sided access type optical disc device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a double-sided access type optical disc used in the embodiment.

FIG. 3 is a schematic configuration diagram of an optical disk device used in the embodiment.

FIG. 4 is a schematic configuration diagram of a main part showing an assembled state of the left and right guide shafts of the lower optical head and respective support bearings of the lower optical head used in the same embodiment.

5A and 5B show a lower optical head used in the same embodiment, FIG. 5A is a side view of the lower optical head, and FIG. 5B is a plan view of the lower optical head.

6A and 6B are views showing a bearing unit used in the embodiment, in which FIG. 6A is a front view, FIG. 6B is a side view, and FIG.

FIG. 7 shows an assembled state of the upper optical head used in the embodiment, (A) is a side view of the upper optical head,
FIG. 6B is a plan view of the upper optical head.

FIG. 8 is a vertical cross-sectional view of a main part showing another embodiment of the present invention.

9A and 9B show a conventional example, FIG. 9A is a schematic configuration diagram of a main part showing an assembled state of left and right guide shafts of a lower optical head and respective support bearings of the lower optical head, and FIG. FIG. 3 is a schematic configuration diagram showing a mounting state of upper and lower optical heads.

[Explanation of symbols]

15 ... Optical disk, 18A ... Lower optical head, 18B ... Upper optical head, 31, 32, 33, 34 ... Guide shaft, 36, 37 ... Fixed support bearing (fixed support element), 41 ... Optical head main body, 42 ... 1 support means, 4
3 ... Second support means, 44 ... Bearing (support element),
46 ... Fixed bearing (fixed support element), 47 ... Elastic support bearing (elastic support element), 48 ... Optical head constituent unit, 49 ... Bearing unit (guide unit), 50 ... Elastic support element mounting means, 53, 54 ... Positioning Projection (positioning means).

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Claims (4)

(57) [Claims] 1. A pair of optical head bodies provided above and below to sandwich an optical disc, and a pair of left and right optical head bodies for guiding an access operation in which the upper and lower optical head bodies independently move between the inner and outer circumferences of the recording surface of the optical disc. With the parallel guide shaft and one of the left and right guide shafts sandwiched between a pair of upper and lower support elements, the first support means mounted on the optical head body and the left and right parallel guide shafts are provided. With the other side sandwiched between the pair of upper and lower support elements, the optical head body is mounted,
Further, the one supporting element is fixedly held in contact with the guide shaft at all times, and the other supporting element is elastically pressed against the guide shaft so that the optical head body and the parallel guide shaft are supported. Second formed by an elastic support element that absorbs assembly errors between
In the optical disk device, the main part of the optical head main body is a common part in which parts other than the second supporting means in the optical head main body are shared between the upper and lower optical head main bodies of the optical disk. And an attachment position of the fixed support element in an upper optical head arranged above the optical disc, and a lower side of the optical disc. A guide unit selectively and removably attached to the optical head constituting unit at the mounting position of the fixed supporting element in the lower optical head disposed in the upper optical head disposed above the optical disc. The mounting position of the elastic supporting element and the elastic supporting element in the lower optical head arranged below the optical disc. Optical disc apparatus, wherein at the mounting position that provided with the elastic supporting element attachment means for selectively attaching removably said resilient support elements. 2. A pair of optical head bodies provided above and below with an optical disc interposed therebetween, and a pair of left and right optical head bodies for guiding an access operation in which the upper and lower optical head bodies independently move between the inner and outer circumferences of the recording surface of the optical disc. With the parallel guide shaft and one of the left and right guide shafts sandwiched between a pair of upper and lower support elements, the first support means mounted on the optical head body and the left and right parallel guide shafts are provided. With the other side sandwiched between the pair of upper and lower support elements, the optical head body is mounted,
Further, the one supporting element is fixedly held in contact with the guide shaft at all times, and the other supporting element is elastically pressed against the guide shaft so that the optical head body and the parallel guide shaft are supported. Second formed by an elastic support element that absorbs assembly errors between
In the optical disk device, the main part of the optical head main body is a common part in which parts other than the second supporting means in the optical head main body are shared between the upper and lower optical head main bodies of the optical disk. And an attachment position of the fixed support element in an upper optical head arranged above the optical disc, and a lower side of the optical disc. A guide unit selectively and removably attached to the optical head constituent unit at the mounting position of the fixed support element in the lower optical head arranged in the above, and the joining of the optical head constituent unit and the guide unit. The optical head constituting unit, the guide unit is brought into contact with the optical head constituting unit from two different directions, and Positioning means for positioning the guide unit at a regular mounting position, the mounting position of the elastic supporting element in the upper optical head disposed above the optical disc, and the elasticity of the lower optical head disposed below the optical disc. An optical disk device comprising elastic support element mounting means for selectively detachably mounting the elastic support element at a mounting position of the supporting element. 3. A pair of optical head bodies provided above and below the optical disk, and a pair of left and right optical head bodies for guiding an access operation in which the upper and lower optical head bodies move independently between the inner and outer circumferences of the recording surface of the optical disk. With the parallel guide shaft and one of the left and right guide shafts sandwiched between a pair of upper and lower fixed bearings, the first support means mounted on the optical head body and the left and right parallel guide shafts are provided. A fixed bearing that is mounted on the optical head main body with the other side sandwiched between a pair of upper and lower bearings, and that the one bearing is held in constant contact with the guide shaft, and the other bearing is the guide. An elastic support bear which is elastically pressed against the shaft to absorb an assembly error between the optical head body and the parallel guide shaft. An optical disk device comprising a second support means formed by a ring, wherein components other than the second support means in the optical head body are shared by common components between the optical head bodies above and below the optical disc. An optical head constituting unit that constitutes a main part of the optical head main body; and a supporting portion for the fixed bearing of the second supporting means,
The mounting position of the fixed bearing in the upper optical head arranged above the optical disc and the mounting position of the fixed bearing in the lower optical head arranged below the optical disc with respect to the optical head constituting unit. A bearing unit that is selectively detachably mounted, a mounting position of the elastic support bearing in the upper optical head arranged above the optical disc, and an elastic support in a lower optical head arranged below the optical disc. An elastic support bearing mounting means for selectively detachably mounting the elastic support bearing at a mounting position of the bearing, and a joint provided between the optical head constituent unit and the bearing unit, which is provided with respect to the optical head constituent unit. Contact the bearing unit from two different directions. Optical disk apparatus characterized by comprising a positioning means for positioning the bearing unit to the regular mounting position. 4. A pair of optical head bodies provided above and below with an optical disc interposed therebetween, and a pair of left and right optical head bodies for guiding an access operation in which the upper and lower optical head bodies independently move between the inner and outer circumferences of the recording surface of the optical disc. With the parallel guide shaft and one of the left and right guide shafts sandwiched between a pair of upper and lower support elements, the first support means mounted on the optical head body and the left and right parallel guide shafts are provided. With the other side sandwiched between the pair of upper and lower support elements, the optical head body is mounted,
Further, the one supporting element is fixedly held in contact with the guide shaft at all times, and the other supporting element is elastically pressed against the guide shaft so that the optical head body and the parallel guide shaft are supported. Second formed by an elastic support element that absorbs assembly errors between
In the optical disk device, the main part of the optical head main body is a common part in which parts other than the second supporting means in the optical head main body are shared between the upper and lower optical head main bodies of the optical disk. And an attachment position of the fixed support element in the upper optical head arranged above the optical disc and an attachment position of the fixed support element in the lower optical head arranged below the optical disc. And a fixed support element mounting means for selectively and removably mounting the fixed support element, a mounting position of the elastic support element in the upper optical head arranged on the upper side of the optical disc, and a fixed support element arranged on the lower side of the optical disc. And the mounting position of the elastic support element in the lower optical head, the elastic support element is selectively removable. Optical disc apparatus according to claim kick that provided with the elastic supporting element attachment means.