JP3839936B2 - Optical pickup holding mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanism for movably holding an optical pickup that reads an optical disc signal in a CD player, and more particularly to a technique for improving the operation reliability of the optical pickup.
[0002]
[Prior art]
In a CD player, an optical pickup for reading an optical disc signal is configured to move in a radial direction of a disc mounted on a turntable and rotating. In such a CD player, an optical pickup holding mechanism for movably holding the optical pickup is conventionally configured as shown in FIG. 3A is a plan view, FIG. 3B is a side view of FIG. 3A as viewed from the direction of arrow B, and FIG.
[0003]
As shown in FIG. 3A, one end of the optical pickup 1 is held by a lead screw 2 that serves as both a reference shaft and a feed shaft and its bearings 3 and 4. In this case, a part of the optical pickup 1 is fitted to the lead screw 2, and the optical pickup 1 is moved by rotating the lead screw 2 with a motor (not shown). The other end of the optical pickup 1 is slidably held by a guide rail 5 disposed in parallel with the lead screw 2.
[0004]
Here, the guide rail 5 is a member for positioning the height direction of the optical pickup 1 as shown in FIG. 3B, and the guide rail in the optical pickup 1 is shown in FIG. 3C. The engaging part 1a with 5 is formed in a U-shape. The backlash in the height direction of the engaging portion 1a is structured to be urged downward by a leaf spring of the optical pickup 1 itself so as to come into contact with the guide rail 5. However, in the lateral direction, the slide is smooth. In order to enable the operation, a clearance 6 is provided between the guide rail 5 and the engaging portion 1a.
[0005]
In the figure, reference numeral 7 denotes a chassis of the CD player, and the bearings 3 and 4 and the guide rail 5 are fixed to the lower surface side of the chassis 7. Reference numerals 8 and 9 denote a disk drive motor and a turntable directly connected to the disk drive motor. The optical pickup 1 is arranged in the radial direction of the disk mounted on the turntable 9 by the holding mechanism as described above. It moves and reads the optical disc signal.
[0006]
[Problems to be solved by the invention]
By the way, in the conventional optical pickup holding mechanism as described above, there is a possibility that the optical pickup 1 is displaced when vibration or the like is applied. This point will be described below.
[0007]
That is, the members for holding the optical pickup 1 are each designed with considerably high accuracy, but the fitting portion between the optical pickup 1 and the lead screw 2 and the fitting of the lead screw 2 and its bearings 3 and 4 are fitted. Due to the structure of the mating portion, play occurs within the mating intersection. For this reason, when the CD player is subjected to disturbance such as vibration, such a backlash generated on the lead screw 2 side is affected by the above-described clearance 6 formed between the optical pickup 1 and the guide rail 5. Increasingly, the optical pickup 1 is liable to be displaced in the rotational direction as indicated by an arrow in FIG. Such a shift in the rotation direction of the optical pickup 1 becomes a tracking shift at the time of signal reading, and greatly affects the vibration resistance performance of the CD player.
[0008]
The present invention has been proposed to solve the above-described problems of the prior art, and its purpose is to ensure a smooth sliding operation of the optical pickup and to keep the optical pickup stable at all times. The optical pickup holding mechanism is capable of improving the operational reliability of the optical pickup and contributing to the improvement of the vibration resistance performance of the CD player.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is configured to apply pressure elastically from the lateral direction to the optical pickup so that the clearance in the holding portion of the optical pickup can be stably filled. Thus, the amount of deviation of the optical pickup is suppressed.
[0010]
That is, the optical pickup holding mechanism of the present invention uses a feed shaft for fitting the optical pickup to hold the optical pickup that reads the optical disc signal in a movable manner, and the bearing of the feed shaft is fixed to the chassis. An optical pickup holding mechanism including a feed side holding portion that holds one end of the pickup and a guide side holding portion that holds the other end of the optical pickup so as to be slidable with respect to the chassis. It is what has.
[0011]
According to the first aspect of the present invention, in the optical pickup holding mechanism as described above, the guide side holding portion elastically presses the guide member toward the optical pickup side, and a guide member that holds the optical pickup in a slidable manner. The elastic member is disposed and can be displaced in the pressing direction, and the elastic member is a leaf spring composed of a plurality of portions having different bending characteristics . According to this configuration, when an excessive impact such as vibration is applied, the elastic member can be flexibly displaced stepwise according to the impact. Can be stably filled, and the optical pickup can always be held in a stable state. Therefore, the optical pickup can always be held in a stable state, and the deviation amount of the optical pickup due to the influence of the clearance can be suppressed. In addition, the specific configuration of the elastic member can be selected as appropriate, and can be configured from a plurality of materials. However, by using a leaf spring, the configuration of the member can be simplified, and assembling and economical efficiency Also excellent.
[0014]
According to a second aspect of the present invention, in the optical pickup holding mechanism according to the first aspect, the plate spring includes a taper portion and a contact portion that is provided at a tip of the taper portion and contacts the guide member. It is said. According to this configuration, since the taper portion bends greatly with respect to an excessive impact, the clearance in the holding portion of the optical pickup can be reliably filled, and the leaf spring can be reduced in size and simplified.
[0015]
According to a third aspect of the present invention, in the optical pickup holding mechanism according to the second aspect, the contact portion of the leaf spring is formed so as to have an arc-shaped cross section protruding toward the guide member. According to this structure, a guide member can be favorably and reliably pressed by the contact part which has an arc-shaped cross section.
[0016]
According to a fourth aspect of the present invention, in the optical pickup holding mechanism according to the first aspect, the guide side holding portion includes a groove portion provided on the optical pickup side, and the cylindrical portion is formed in the groove portion. The guide member is inserted. According to this configuration, by forming the guide member in a columnar shape, the optical pickup can be pressed favorably and surely by the guide member, and the guide member itself can be favorably and surely pressed by the elastic member. it can. Further, since the contact area between the guide member and the optical pickup becomes small, the sliding operation of the optical pickup can be made smoother.
[0017]
According to a fifth aspect of the present invention, in the optical pickup holding mechanism according to any one of the first to fourth aspects, the elastic member is configured to hold down the guide member at a plurality of locations equally dividing the entire length of the guide member. It is characterized by that. According to this configuration, the lateral pressure applied to the optical pickup can be made substantially constant regardless of the operation position of the optical pickup by pressing the guide member at a plurality of locations that equally divide the entire length of the guide member.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, one embodiment to which an optical pickup holding mechanism according to the present invention is applied will be described in detail with reference to FIG. 1 and FIG. In addition, the same code | symbol is attached | subjected to the same part as the prior art shown in FIG. 3, and the description is abbreviate | omitted.
[0019]
[1. Constitution]
First, FIG. 1 is a diagram showing an optical pickup holding mechanism according to the present embodiment, in which (A) is a plan view, (B) is a side view as viewed from arrow B in (A), and (C) is (A). C is an enlarged sectional view taken in the direction of arrow C, and (D) is an enlarged sectional view taken in the direction of arrow D of (A). As shown in FIG. 1A, one end of the optical pickup 1 is connected to a lead screw (feed shaft) 2 that serves as both a reference shaft and a feed shaft, as in the conventional example shown in FIG. It is held by bearings 3 and 4. In this case, a part of the optical pickup 1 is fitted to the lead screw 2, and the optical pickup 1 is moved by rotating the lead screw 2 with a motor (not shown).
[0020]
On the other hand, the other end of the optical pickup 1 is provided with a guide shaft (guide member) 11 arranged in parallel with the lead screw 2 according to the present invention, and a leaf spring (holding the guide shaft 11 toward the optical pickup 1). The guide shaft 11 and the leaf spring 12 are fixed to the lower surface side of the chassis 7 by a support member 13.
[0021]
More specifically, the guide shaft 11 is formed in a cylindrical shape as shown in FIGS. 1C and 1D, and as shown in FIG. Are supported by the support portions 13a and 13b. In this case, the support surfaces of the support portions 13a and 13b of the support member 13 are formed in a U shape as shown in FIG. 1C, and the guide shaft 11 is in contact with the optical pickup 1 inside thereof. It can be moved away. Further, the engaging portion 1a of the optical pickup 1 with the guide shaft 11 is formed in a U shape as shown in FIG.
[0022]
2 is a view showing the leaf spring of FIG. 1, in which (A) is a plan view, and (B) and (C) are side views in different directions of (A). As shown in FIG. 2A, the leaf spring 12 includes pressing protrusions 12a and 12b having the same size and shape at two locations in the longitudinal direction. In addition, as shown to (A) of FIG. 1, these presser protrusion 12a, 12b is arrange | positioned at two positions which divide the full length of the guide shaft 11 into 3 equal parts.
[0023]
Further, as shown in FIGS. 2B and 2C, the pressing protrusions 12a and 12b are both bent in the orthogonal direction from the main body portion of the leaf spring 12, and the tapered portion 12c and the tapered portion are formed. It is comprised from the contact part 12d provided in the front-end | tip of 12c. In this case, as shown in FIG. 2C, the contact portion 12d is formed to have an arc-shaped cross section that protrudes toward the guide shaft 11 side.
[0024]
[2. Action]
According to the present embodiment having the above configuration, the following operation is obtained. First, the clearance between the engaging portion 1a of the optical pickup 1 and the guide shaft 11 is stably filled by elastically applying pressure from the lateral direction to the optical pickup 1 through the guide shaft 11 by the leaf spring 12. be able to. On the other hand, the lateral pressure applied to the guide shaft 11 by the leaf spring 12 is sufficient to close the clearance, and does not force the guide shaft 11 against the engaging portion 1a of the optical pickup 1. Therefore, the optical pickup 1 The sliding operation can be performed smoothly.
[0025]
In addition, since the pressing protrusions 12a and 12b of the leaf spring 12 are respectively composed of a tapered portion 12c and a contact portion 12d, when an excessive impact such as vibration is applied, the tapered portion 12c bends. Shock is absorbed. Therefore, the clearance between the engaging portion 1a of the optical pickup 1 and the guide shaft 11 can be stably filled regardless of the degree of impact. Furthermore, by pressing the guide shaft 11 at these two locations that divide the entire length of the guide shaft 11 into three parts by these pressing protrusions 12a and 12b, the lateral direction applied to the optical pickup 1 is applied regardless of the operating position of the optical pickup 1. The pressure can be made almost constant.
[0026]
The contact portions 12d of the pressing protrusions 12a and 12b of the leaf spring 12 have an arc-shaped cross section that protrudes toward the guide shaft 11, and the guide shaft 11 that contacts the contact portion 12d is formed in a cylindrical shape. Therefore, the guide shaft 11 can be pressed well and reliably by the pressing protrusions 12a and 12b. On the other hand, since the contact area between the guide shaft 11 and the optical pickup 1 can be reduced by forming the guide shaft 11 in a columnar shape in this manner, the sliding operation of the optical pickup 1 can be made smoother.
[0027]
[3. effect]
As described above, according to the present embodiment, the clearance in the holding portion of the optical pickup 1 can be achieved by a simple configuration using the guide shaft 11 and the leaf spring 12 regardless of the degree of impact and the operating position of the optical pickup 1. Can be stably packed. For this reason, the optical pickup 1 can always be held in a stable state and the amount of deviation of the optical pickup 1 can be suppressed without increasing the play on the lead screw 2 side due to the influence of the clearance even with an excessive impact. . Therefore, it is possible to improve the operational reliability of the optical pickup 1 and contribute to the improvement of the vibration resistance performance of the CD player. In addition, the present embodiment is a small and simple configuration using a single leaf spring 11 as an elastic member, and is excellent in assemblability and economy.
[0028]
[4. Other Embodiments]
Note that the present invention is not limited to the above-described embodiment, and various other modifications can be implemented within the scope of the present invention. For example, in the above-described embodiment, the holding portion of the leaf spring is provided at two positions that equally divide the entire length of the guide shaft into three parts, but similarly at three or more positions that equally divide the entire length of the guide shaft. It is also possible to provide it. Further, the specific shape of the leaf spring can be appropriately selected, and three or more types of portions having different deflection characteristics can be configured. Further, as the elastic member, it is possible to combine a leaf spring and another member, or to use only an elastic member other than the leaf spring, but it is small, simplified, and easy to assemble and economical. It is desirable to use a leaf spring.
[0029]
On the other hand, the guide member is not necessarily formed in a columnar shape, but is preferably a columnar shape in order to apply a pressure to the optical pickup reliably and to make the optical pickup slide smoothly.
[0030]
That is, in the present invention, as long as the pressure can be elastically applied from the lateral direction to the optical pickup using the guide member and the elastic member, the specific configuration of each part can be freely selected. Even in this case, excellent effects as described in the above embodiments can be obtained.
[0031]
【The invention's effect】
As described above, according to the present invention, by configuring the optical pickup to elastically apply pressure from the lateral direction, while ensuring a smooth sliding operation of the optical pickup, Since the clearance in the holding portion can be stably filled, the optical pickup can always be held in a stable state and the amount of deviation of the optical pickup can be suppressed. Therefore, it is possible to improve the operational reliability of the optical pickup and contribute to the improvement of the vibration resistance performance of the CD player.
[Brief description of the drawings]
1A and 1B are diagrams showing an optical pickup holding mechanism according to an embodiment to which the present invention is applied, in which FIG. 1A is a plan view, FIG. 1B is a side view of FIG. (A) is an enlarged cross-sectional view taken along arrow C, (D) is an enlarged cross-sectional view taken along arrow D in (A).
2A and 2B are views showing the leaf spring of FIG. 1, in which FIG. 1A is a plan view, and FIGS. 2B and 2C are side views in different directions of FIG.
3A and 3B are diagrams showing a conventional optical pickup holding mechanism, in which FIG. 3A is a plan view, FIG. 3B is a side view of FIG. is there.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Optical pick-up 1a ... Engagement part 2 ... Lead screw 3, 4 ... Bearing 5 ... Guide rail 6 ... Clearance 7 ... Chassis 8 ... Disk drive motor 9 ... Turntable 11 ... Guide shaft 12 ... Plate spring 12a, 12b ... Presser Projection 12c ... Tapered portion 12d ... Contact portion 13 ... Support members 13a, 13b ... Support portion

Claims (5)

In order to hold the optical pickup that reads the optical disk signal movably, a feed shaft that fits the optical pickup is used, and a feed-side holding portion that holds one end of the optical pickup by fixing a bearing of the feed shaft to the chassis; In the optical pickup holding mechanism comprising a guide side holding portion that holds the other end of the optical pickup slidably with respect to the chassis,
The guide side holding part is
A guide member for slidably holding the optical pickup;
An elastic member disposed so as to elastically hold the guide member toward the optical pickup side and displaceable in a holding direction;
The optical pickup holding mechanism , wherein the elastic member is a leaf spring composed of a plurality of portions having different flexural characteristics . 2. The optical pickup holding mechanism according to claim 1, wherein the leaf spring includes a taper portion and a contact portion provided at a tip of the taper portion to contact the guide member. 3. The optical pickup holding mechanism according to claim 2, wherein the contact portion of the leaf spring is formed to have an arcuate cross section protruding toward the guide member. The optical pickup according to claim 1, wherein the guide side holding portion includes a groove portion provided on the optical pickup side, and the guide member formed in a columnar shape is inserted into the groove portion. Retention mechanism. 5. The optical pickup holding mechanism according to claim 1, wherein the elastic member is configured to hold the guide member at a plurality of locations that equally divide the entire length of the guide member.

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