KR100647945B1 - Beam splitter holder of optical pick-up - Google Patents

Abstract

The present invention relates to a beam splitter fixture of an optical pickup.

Beam splitter fixing device of the present invention, the beam splitter (BS); A base having a seating portion for mounting the beam splitter BS; A holder frame on which the beam splitter BS is seated, a holder frame formed by being substantially upright from the holder base, a three-point support portion formed on the holder frame to support the beam splitter BS seated on the holder base; A holder including an opening formed in the holder frame to allow the laser beam to pass through the seated beam splitter BS; A bent plate spring for fixing the beam splitter mounted to the seating portion of the base while seated in the holder; It is configured to include. According to the present invention, in constructing the beam splitter fixing device, it is possible to prevent the use of a structure that is difficult to handle with a mold by making a holder resistant to shock and stable reliability based on a three-point support structure.

Optical pickup, beam splitter (BS)

Description

BEAM SPLITTER HOLDER OF OPTICAL PICK-UP}

1 is a view showing the structure of a general optical system in an optical pickup device

Figure 2a is a perspective view of a conventional both ends support structure based beam splitter fixing device

Figure 2b is a plan view of a conventional bi-support structure based beam splitter fixture

Figure 3 is a perspective view of a conventional three-point support structure based beam splitter fixing device

Figure 4 is a perspective view of a conventional single stage support structure based beam splitter fixing device

5A is a perspective view of a beam splitter holder according to the present invention;

Figure 5b is a diagram showing the elastic force application region of the beam splitter holder according to the present invention

Figure 6 is a perspective view of the beam splitter fixing device according to the present invention

<Explanation of symbols for main parts of the drawings>

50: holder 51: holder base

521: elastic connection portion 522: elastic portion

53: holder frame 541,542,543: support part

55: opening 60: base

The present invention relates to an apparatus for fixing a beam splitter (BS) of an optical pick-up used in an optical recording / reproducing apparatus.

An optical disc is a data storage medium for recording or reproducing information by using optical characteristics, and generally has a small disc shape. In order to record data on the optical disk or to reproduce the recorded data, an optical disk driver is required. An optical pickup is mounted inside the optical disk driver, and the optical pickup records information on the optical disk or reproduces the information recorded on the optical disk.

Such optical discs include CDs and DVDs, and in order to record or reproduce information on different types of discs, laser light having a wavelength unique to each disc must be used. That is, information is recorded and reproduced using a wavelength of 780 nm for CD and a wavelength of 650 nm for DVD. Accordingly, the development of a compound optical pickup device capable of recording and reproducing information on various optical discs has been actively conducted in recent years, and recently, a research on a Blu-ray disc and its driver capable of recording and reproducing ultra high density data has been carried out. Development is also active.

1 is a diagram schematically illustrating the optical system structure in a general optical pickup device. Optical pickup may be divided into circuit components such as laser diodes (LDs), optical components that reflect, transmit, converge, and divert a laser beam, and mechanical components that implement a structure in which the components are mounted and adjustable. In addition, a mechanism called an actuator is used to accurately form a beam on the optical disk, and the actuator accurately collects the laser light output from the laser diode LD at a location where information on the optical disk is recorded. : Adjusts the position of OL to improve the reproduction and recording performance of information by laser.

Looking at the optical system configuration in a general optical pickup device as shown in Figure 1, an optical disk 11, an object lens (12), a beam splitter (BS) 13, a collimator lens (collimator lens) ) 14, a light emitting unit (LD) 15, and a photodetector (PDIC) 16.

In Fig. 1, the laser light output from the light emitting portion LD 15 is converted into parallel light while passing through the collimating lens 14, and the parallel light is converted into the objective lens 12 through the beam splitter BS 13. ), The objective lens 12 collects parallel light and collects the light at one point on the optical disk 11. The reflected light reflected by the optical disk 11 is reflected by the beam splitter (BS) 13 and is incident on the photodetector (PDIC) 16 to receive the reflected light.

In the optical system of the optical pickup device, the beam splitter (BS) 13 is a component that transmits and reflects light, and the beam splitter BS is located at the same time on the optical path of the incident light and the reflected light. Only when it is placed in the state can guarantee the performance of the optical system.

Therefore, various mechanical configurations for mounting the beam splitter BS have been proposed. 2 to 4 show some examples of a conventional beam splitter (BS) fixing device.

First, FIGS. 2A and 2B show a beam splitter BS fixing structure based on both ends of a conventional beam splitter BS fixing device.

Referring to FIG. 2A, a beam splitter (BS) 22 is mounted on a base 21 having a substantially block shape. To this end, the base 21 has a recess 23 having a groove shape. In the seating part 23, the supporting parts 241 and 242 are formed in two wall surfaces located rearward as seen from the figure. Then, in order to seat the beam splitter (BS) 22 on the seating part 23, a plate-shaped spring 25 bent forward corresponding to the support part is mounted. In addition, the first support part 261 and the second support part 262 for supporting the bottom surface of the beam splitter (BS) 22 are formed on the bottom surface of the seating part 23 in a state spaced apart by a predetermined distance.

2B shows a planar configuration with the beam splitter (BS) 22 seated on the base 21. As shown in FIG. 2B, the beam splitter (BS) 22 is in contact with two places of the first support part 241 and the second support part 242 and closely adhered to the support parts 241 and 242 by the elastic force of the spring 25. It is seated in a state.

The beam splitter (BS) fixing structure based on both ends of the support structure is strong in impact, but on the other hand, there is a problem in accuracy, light transmission, and reliability of securing the reflection path because there is a possibility of aberration caused by the deformation of the beam splitter (BS). .

Figure 3 shows a beam splitter (BS) fixing structure based on a three-point support structure of the conventional beam splitter (BS) fixing device.

Referring to FIG. 3, the beam splitter BS 32 of the conventional three-point support structure-based beam splitter BS is mounted on an approximately block-shaped base 31. To this end, a groove-shaped seating portion 33 is formed in the base 31. In the seating part 33, three support parts 341, 342, and 343 are formed in a projection shape at two wall surfaces located rearward as seen in the drawing. Then, in order to seat the beam splitter (BS) 32 on the seating portion 33, a plate-shaped spring 35 bent forward corresponding to the support portion is mounted. The first support part 361 and the second support part 362 for supporting the bottom surface of the beam splitter BS 32 are formed on the bottom surface of the seating part 33 in a state of being spaced apart by a predetermined distance.

As shown in FIG. 3, the beam splitter (BS) 32 is in contact with three places of the first support part 341, the second support part 342, and the third support part 343, and at the same time by the elastic force of the spring 35. It is seated in close contact with the supports 341, 342, and 343.

The beam splitter (BS) fixing structure based on both ends of the support structure has a stable advantage in reliability, while the three-point support part is very difficult to implement in a mold.

Figure 4 shows a beam splitter (BS) fixing structure based on a single end support structure of the conventional beam splitter (BS) fixing device. Referring to FIG. 4, in the conventional single-support structure-based beam splitter (BS) fixing device, a beam splitter (BS) 42 is mounted on a base 41 having a substantially block shape. To this end, the base 41 has a groove-shaped mounting portion 43 is formed. In the seating portion 43, a supporting portion 441 is formed at one wall surface located rearward in the drawing. Then, in order to seat the beam splitter (BS) 42 on the seating portion 43, a plate-like spring 45 which is bent forward corresponding to the support portion is mounted. The first support part 461 and the second support part 462 for supporting the bottom surface of the beam splitter BS 42 are formed on the bottom surface of the seating part 43 in a state of being spaced apart by a predetermined distance.

As shown in FIG. 4, the beam splitter (BS) 42 contacts the support part 441 at the base of the single-stage support structure and is seated in close contact with the support part 441 by the elastic force of the spring 45. .

Although the beam splitter (BS) fixing structure based on such a single support structure has an advantage of easy implementation of the seating structure, on the other hand, it is weak in shock, unstable, and has a disadvantage in that reliability is significantly lower than other structures.

An object of the present invention is to provide a beam splitter fixing apparatus for fixing a beam splitter (BS) of an optical pickup, which is stable, robust, and easy to implement in a mold based on a three-point support structure.

It is still another object of the present invention to form a beam splitter support structure integrally with a holder seated on a beam splitter base and to use the holder to mount the beam splitter BS on the base seating portion, thereby more stably and stably beam splitter It is to provide a beam splitter (BS) fixing device for mounting (BS).

Still another object of the present invention is to integrally form three support parts for supporting the beam splitter (BS) to the holder seated on the beam splitter base and an elastic part for tightly attaching the beam splitter to the support parts with elastic force, and the holder The present invention provides a beam splitter (BS) fixing device capable of firmly and stably mounting a beam splitter to a base seating part with a beam splitter mounted therein.

Beam splitter fixing device of the optical pickup of the present invention for achieving the above object, the beam splitter (BS); A base having a seating portion for mounting the beam splitter BS; A holder frame on which the beam splitter BS is seated and a holder frame formed by being substantially upright from the holder base, a plurality of supports formed on the holder frame to support the beam splitter BS seated on the holder base; A holder including an opening formed in the holder frame to allow the laser beam to pass through the seated beam splitter BS; A bent plate spring for fixing the beam splitter mounted to the seating portion of the base while seated in the holder; Characterized in that configured to include.

In the beam splitter fixing device of the optical pickup of the present invention, the spring is characterized in that it is integrally configured on the holder base.

Further, in the beam splitter fixing device of the optical pickup of the present invention, a spring to which elastic force is applied into the virtual polygonal region connecting the plurality of supports is integrally formed on the holder base.

In the beam splitter fixing device of the optical pickup of the present invention, the holder is characterized in that it is made of press water.

In addition, in the beam splitter fixing apparatus of the optical pickup of the present invention, the plurality of support portions are characterized by consisting of spherical protrusions.

Further, in the beam splitter fixing device of the optical pickup of the present invention, the opening is characterized in that the rectangular hole (hole) formed in the holder frame.

An embodiment of the beam splitter fixing apparatus of the optical pickup according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, Figure 5a is a perspective view showing the configuration of a beam splitter holder (BS Holder) according to the present invention.

BS holder 50 according to the invention is made of press water. This is achieved by integrating the three projection-shaped supports (541, 542, 543) into the holder (50), which was difficult to implement with a mold when manufacturing a three-point support-based beam splitter (BS) fixture. This is to reduce the production burden.

The holder 50 consists of a holder base 51 and a holder frame 53 of a shape that is bent substantially upright with the holder base 51. Although the spring for fixing the beam splitter BS may be provided as a separate structure like the conventional beam splitter fixing device, it is preferable that the spring is integrally formed in the holder 50 in the present invention. That is, as shown in the figure, the elastic connecting portion 521 is formed upright to one end of the position facing the holder frame 53 in the holder base 51, and the front end portion is bent to form the elastic portion 522. do.

The elastic connecting portion 521 and the elastic portion 522 correspond to the spring used in the conventional beam splitter fixing device. In the present invention, since the holder 50 is added, it is possible to prevent the addition of a substantial number of parts by integrally configuring the holder 50 rather than using the spring as a separate part.

In addition, an opening 55 is formed in the holder frame 53 to ensure an optical path through the beam splitter BS mounted on the holder base 51. This opening part 55 was formed by perforating the holder frame 53 in a substantially rectangular hole shape. However, it is not necessarily limited to a hole shape. For example, the opening portion 55 may be formed in an open form by cutting off a part of the holder frame 53.

On the other hand, the holder frame 53 is provided with a first support portion 541, a second support portion 542, and a third support portion 543 which are positioned at three spaced apart positions. The supports 541, 542, 543 placed in the three spaced apart positions form an imaginary triangle connecting the supports. The positions of the support portions 541, 542, 543 and the elastic portion 522 are set so that the elastic force of the elastic portion 522 is exerted on the region inside the virtual triangle.

This is shown in Fig. 5B. As shown in FIG. 5B, the spring split force is applied to the virtual triangular inner region connecting the three supports 541, 542, 543 to the impact splitter.

If the spring elastic force exerted by the elastic portion 522, which is an integral spring structure, is applied to the virtual triangular outer region, a force for pushing the beam splitter BS to the virtual triangular outline made of the supporting portions 541, 542, 543 acts. In this case, the beam splitter BS is subjected to a twisting force to the position, and in this case, the beam splitter BS may be displaced correctly and the optical path may be deformed accordingly. It should be designed and manufactured as the inner area of the triangular area.

6 shows a structure in which the beam splitter (BS) 61 is mounted on the base 60 by using the holder 50 according to the present invention. As shown in Fig. 6, the beam splitter (BS) 61 is firmly mounted to the seating portion 62 formed in the base 60 in a state of being seated on the holder 50. That is, the beam splitter (BS) 61 is stably supported by the three support portions 541, 542, 543 of the holder frame 53 in a state where the beam splitter (BS) 61 is seated on the holder base 51, and by the integral elastic portion 522. The holder 50, which is fixed and mounted on the beam splitter BS 61, is mounted to the seating part 62 formed on the base 60.

Therefore, the stable and robust beam splitter mounting structure is completed based on the three-point support structure, and the possibility of aberration caused by deformation is eliminated. It provided the basis for facilitating manufacture and realizing the implementation of the mounting structure more conveniently.

The beam splitter fixing device of the optical pickup of the present invention can make the mounting of the beam splitter firm and stable by integrally manufacturing the three-point support of the beam splitter and the beam splitter fixing spring in a holder made of press water. In addition, by integrating the support structure, which was difficult to realize with a mold, into the holder, which is a press material, the mold was designed and manufactured for convenience. The spring was integrated to eliminate the actual number of parts, thereby overcoming the disadvantages in productivity and price. .

Claims (8)

Beam splitter (BS); A holder base on which the beam splitter BS is seated, a holder frame formed by being substantially upright from one side of the holder base, and a plurality of support parts formed on the holder frame to support the beam splitter BS seated on the holder base. And an elastic part extending substantially upright from the other side of the holder base to impart an elastic force such that the beam splitter BS is in close contact with the support part, and the seated beam splitter BS to the holder frame to allow laser light to pass therethrough. A holder comprising an opening formed; A base having a seating portion for mounting the holder; Beam splitter fixing device for an optical pickup, characterized in that configured to include. delete 2. The beam splitter fixing apparatus of claim 1, wherein the position where the elastic part supports the beam splitter is in a virtual polygonal area connecting the plurality of support parts. The beam splitter fixing device of claim 1, wherein the holder is made of press water. The beam splitter fixing apparatus of claim 1, wherein the plurality of supporting portions have a spherical protrusion shape. The beam splitter fixing apparatus of claim 1, wherein the opening is formed of a rectangular hole drilled in the holder frame. The beam splitter fixing apparatus of claim 1, wherein the plurality of supporting portions are formed in a protrusion shape and are three. A beam splitter BS, a support portion on which the beam splitter is seated, a plurality of protrusions supporting one side of the beam splitter on one side thereof, and the beam splitter close to the protrusion on the other side of the beam splitter. In the elastic member is installed, And a position at which the elastic member supports the beam splitter is located in a virtual polygonal region connecting the plurality of protrusions so that forces are evenly distributed to the plurality of protrusions.

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