JP3885634B2 - Recording / playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a biasing means for a guide shaft that guides the movement of a head unit mainly composed of an optical pickup of a recording / reproducing apparatus that is built in a computer or AV device or is widely used as a peripheral device.
[0002]
[Prior art]
A recording / reproducing apparatus using an optical disc (for example, CD-R / RW, DVD-R / RW) capable of recording a large amount of information as a recording medium is indispensable particularly in a personal computer (hereinafter referred to as a personal computer) It is built in the PC itself or connected with a cable as a so-called external. In AV equipment, information is recorded / reproduced using a DVD as a recording medium, and the reliability and durability of the recording / reproducing apparatus are required to be high.
[0003]
FIG. 6 shows the appearance of a notebook personal computer. A recording / reproducing apparatus D is built in a side portion of the personal computer main body P, and an optical disk is loaded / unloaded by a disk tray. In general, in the case of a notebook computer, since it must be configured to be very flat, the mechanism for loading / unloading the disc tray is omitted, and the loading of the disc tray is operated by the user pushing it with a fingertip. .
[0004]
The recording / reproducing apparatus employed in such a notebook personal computer has a unit configuration as shown in FIG. 7, and this also has a very flat form. In the figure, reference numeral 101 denotes a disk tray, which is guided by a guide rail 102 and fits in a chassis case 103.
[0005]
In the center of the disc tray 101, a turntable 104 fixed to a drive shaft of a spindle motor arranged immediately below is arranged. The turntable clamps the center hole of the optical disc so as to transmit the rotational force. . Reference numeral 105 denotes a head unit mainly composed of an optical pickup, which moves in a radial direction within a slit 101a formed on a disk tray so as to record and reproduce information on the optical disk.
[0006]
By the way, in order to enable the head unit to move in the radial direction in the disk tray 101, the head unit 105 is generally fixed to the head base 106, and the head base 106 is slidably attached to the guide shaft. The head base is configured to translate in the lead groove of the screw shaft.
[0007]
In such a configuration, the relative inclination and distance between the optical pickup and the recording surface of the optical disk could not be accurately determined due to the inclination of the optical axis of the optical pickup, the inclination of the spindle motor, and particularly the guide shaft mounting error. . The error is different for each finished product, and an attempt to correct the error in a later process has been proposed (for example, JP-A-11-203801).
[0008]
As shown in FIG. 8, a guide shaft 109 is disposed so as to be locked by a seat portion of an adjusting screw 108 screwed to the chassis 107, and a compression coil spring 110 is interposed between the guide shaft and the chassis. Thus, the height position of the guide shaft 109 biased upward by rotating the adjusting screw 108 is adjusted. FIG. 9 shows a structure in which a plate spring is interposed instead of the compression coil spring, and the height position of the guide shaft 109 is adjusted by rotating the adjustment screw 108 in the same manner.
[0009]
[Problems to be solved by the invention]
In this way, when the height position is adjusted with the adjusting screw while urging the guide shaft upward, it is desirable that the urging force be as strong as possible within a range in which the guide shaft is not deformed. That is, when vibration is applied to the personal computer main body, it is an important condition that the spring does not bend and the head unit does not vibrate, and that the spring force does not decrease over time.
[0010]
However, in the case of the configuration shown in FIG. 8, in order to ensure the spring force and to improve the stress characteristics, the number of turns of the compression coil spring must be increased, and the total length of the compression coil spring becomes longer. . In order to interpose this lengthened compression coil spring, the structural thickness of the entire unit must be increased, which affects the thinning of the personal computer body. Furthermore, the height position that serves as a reference for the guide shaft is greatly changed, and a significant design change is required.
[0011]
On the other hand, in the case of the configuration of FIG. 9, in order to ensure the spring force and improve the stress characteristics as in the case of the compression coil spring, it is necessary to employ a long leaf spring portion. However, the overall size of the leaf spring is increased, which is disadvantageous for downsizing. Further, since the leaf spring has a steep spring multiplier, the urging force easily varies, and it has been difficult to obtain high reliability.
[0012]
The present invention has been made to solve such a problem, and provides a biasing means that can strongly bias the guide shaft and does not cause the spring force to be degenerated. The purpose is to prevent the thickness from becoming large.
[0013]
[Means for Solving the Problems]
The present invention includes a head unit which is adapted to record and reproduce information by moving parallel to the recording surface of the recording medium, comprising and a guide shaft for guiding the parallel movement of the head unit recording In the apparatus, a biasing means for forming a small-diameter end portion on the guide shaft, inserting a coil portion of a torsion coil spring into the small-diameter end portion of the guide shaft, and constantly biasing the guide shaft, and a small-diameter end of the guide shaft And holding means adapted to adjust the height position of the guide shaft by an adjusting screw that pushes down the part, and solves the above-mentioned problems.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a state in which a shield cover is removed from the bottom surface of a disk tray 1 of a recording / reproducing apparatus embodying the present invention. The disk tray 1 is guided by a guide rail 2 and loaded or unloaded from a chassis case 3. Is done.
[0015]
The disk tray 1 is provided with a wiring board 4 on which electronic components such as a semiconductor integrated circuit are mounted. Further, a drive system unit A for the optical disk and the head unit is fixed in a buffered state by screws 5.
[0016]
The drive system unit A is configured such that drive system element parts are disposed on a base plate 6 formed of a steel plate as shown in FIG. 2, and a turntable exposed on the surface of the disk tray 1 at the tip thereof. A spindle motor 7 for rotationally driving is fixed to the frame member 9 by a support plate 8.
[0017]
The frame member 9 is integrally formed of synthetic resin, and leg portions 9a and 9b are formed in a state derived from the left and right of the mounting portion of the spindle motor 7, and the end portion of the guide shaft 10 is formed on the leg portion 9a. The insertion hole 11 of 10a is formed, and the accommodation recessed part 12 of this small diameter end part is formed in the site | part in which the small diameter end part 10b of the other end is located. On the other hand, similarly to the leg portion 9b, the receiving recesses 14 and 15 for the small diameter ends are formed at the positions where the small diameter ends 13a and 13b at both ends of the guide shaft 13 are located.
[0018]
Next, reference numerals 16 and 17 denote reinforcing plates, and a screw hole 16 a into which the adjusting screw 18 is screwed is formed at one end of the reinforcing plate 16. Further, screw holes 17 a and 17 b into which the adjusting screws 19 and 20 are screwed are formed at both ends of the reinforcing plate 17. The coil portions 22a, 23a, and 24a of the torsion coil springs 22, 23, and 24 are inserted into the small-diameter end portions 10b, 13a, and 13b of the guide shafts 10 and 13 as shown in FIG. When the small-diameter end portions 10b, 13a, and 13b are accommodated in 12, 14, and 15, the arms 22b, 23b, and 24b of the torsion coil spring are positioned in the grooves 12a, 14a, and 15a of the accommodating recesses, and the arms 22b, 23b, and 24b are It will be in the state supported by protrusion 12b * 14b * 15b in a groove | channel (refer FIG. 5).
[0019]
After the guide shafts 10 and 13 are thus arranged on the frame member 9, the reinforcing plates 16 and 17 are arranged so as to cover the guide shaft, and the mounting screws 21 are screwed into the screw holes 6 a of the base plate 6 to thereby form the frame. The member 9 and the reinforcing plates 16 and 17 can be fixed simultaneously. When such a fixed state is reached, the adjustment screws 18, 19, 20 at the ends of the reinforcing plates 16, 17 are positioned on the small diameter ends 10b, 13a, 13b of the guide shaft as shown in FIG. become. Therefore, the reinforcing plates 16 and 17 fulfill the function of supporting the adjusting screws 18, 19, and 20 and the function of improving the structural strength of the entire drive system unit A.
[0020]
Next, the screw shaft 25 is disposed on the leg portion 9 a of the frame member 9, and the rotational force of the thread motor 27 is transmitted to the screw shaft by the gear unit 26. Therefore, when the screw shaft 25 rotates, the nut 28 engaged with the lead groove 25a is driven, and the head base 29 connected to the nut is guided by the guide shafts 10 and 13 to reciprocate. Optical components such as an optical pickup 30 are mounted on the head base 29. The head base 29 moves in parallel with the recording surface of the recording medium as the head base moves, and records and reproduces information.
[0021]
Since the frame member 9 integrally formed in this way is configured to support both ends of the guide shafts 10 and 13, both ends of the screw shaft 25, the thread motor 27, the gear unit 26, and the spindle motor 7, (1) drive The cost can be reduced by reducing the number of parts of the system unit A. (2) The assembly position of the optical pickup 30 supported by the guide shafts 10 and 13 with respect to the rotation center of the spindle motor 7 (that is, the rotation center of the disk). Therefore, it is possible to provide a recording / reproducing apparatus having good recording characteristics.
[0022]
The present invention is configured as described above. When the drive system unit A is assembled as shown in FIG. 1, the adjusting screws 18, 19, and 20 of the reinforcing plates 16 and 17 are connected to the small diameter end portions 10b and 10b of the guide shafts 10 and 13, respectively. The tops of the curved surfaces 13a and 13b come into contact as shown in FIG. At this time, the torsion coil springs 22, 23, and 24 are pushed down by the small-diameter end portions 10 b, 13 a, and 13 b of the guide shaft, and the arms 22 b, 23 b, and 24 b are projected at the positions indicated by solid lines in FIG. It will be in the state supported by 12b * 14b * 15b.
[0023]
The torsion coil springs 22, 23, 24 are equivalent to the arm being located at the position indicated by the phantom line in the drawing when the tension action is not applied. Then, a spring force is generated by the torsion coil springs 22, 23, and 24, and a biasing force that pushes the small-diameter end portions 10 b, 13 a, and 13 b of the guide shafts 10, 13 upward is generated. Then, when the adjusting screws 18, 19, 20 are rotated and pushed down, the torsion coil springs 22, 23, 24 are lowered as shown by the broken lines in the figure, thereby adjusting the height positions of the guide shafts 10, 13. It becomes possible.
[0024]
The state is a state in which the biasing force by the torsion coil springs 22, 23, 24, that is, the release of the spring force is blocked by the adjusting screws 18, 19, 20, and the static pressure by the adjusting screws 18, 19, 20 is The guide shafts 10 and 13 can be fixed at an arbitrary height position by being balanced against the urging force. In addition, since the guide shaft is inserted into the coil portions of the torsion coil springs 22, 23, and 24, and the spring force is obtained from each of the two arms, a large spring force can be obtained while saving space. .
[0025]
In the case of the embodiment described above, only the end portion 10a of the guide shaft 10 is held by the insertion hole 11 of the frame member 9, and this end portion is used as a reference for the height position at the other three end portions. Since the height position can be individually adjusted, it is possible to perform an accurate adjustment work regardless of any errors.
[0026]
【The invention's effect】
As described above in detail, according to the present invention, since the torsion coil spring capable of obtaining a strong spring force is employed, a sufficient urging force for the guide shaft can be obtained, and the spring force does not decrease with time, so that it has high reliability. Sex can be obtained. In addition, since the coil portion of the torsion coil spring is inserted into the small diameter end portion of the guide shaft, it does not cause a thickening of the entire unit, and can greatly contribute to a reduction in thickness. .
[Brief description of the drawings]
FIG. 1 is a plan view showing an assembled state of a recording / reproducing apparatus of the present invention.
FIG. 2 is an exploded perspective view showing a configuration of a main part of the recording / reproducing apparatus of the present invention.
FIG. 3 is a plan view showing an assembled state of the main part of the recording / reproducing apparatus of the present invention.
FIG. 4 is a perspective view showing a configuration of an urging unit according to the present invention.
FIG. 5 is a side view showing the operating state of the urging means according to the present invention.
FIG. 6 is a perspective view of the appearance of a notebook personal computer incorporating a recording / reproducing device.
FIG. 7 is a perspective view of the appearance of a recording / reproducing apparatus.
FIG. 8 is a side view showing an example of a conventional guide shaft urging means.
FIG. 9 is a side view showing another example of a conventional guide shaft urging means.
[Explanation of symbols]
1 ... Disc tray 6 ... Base plate 7 ... Spindle motor 9 ... Frame Member 10 · 13 ······ Guide shaft 11 ············· Fit holes 12 · 14 · 15 ··· Receiving recesses 16 · 17 ········ Reinforcing plates ... Adjustment screw 22, 23, 24 ... Torsion coil spring 25 ... Screw shaft 26 ... Gear unit 27 ... Thread Motor 28 ... Nut 29 ... Head base 30 ... Optical pickup

Claims (1)

A head unit adapted to record and reproduce information by moving it parallel to the recording surface of the recording medium;
In a recording / reproducing apparatus comprising a guide shaft for guiding the parallel movement of the head unit ,
Forming a small diameter end on the guide shaft;
A biasing means for constantly biasing the guide shaft by inserting the coil portion of the torsion coil spring into the small-diameter end of the guide shaft;
Holding means adapted to adjust the height position of the guide shaft by means of an adjustment screw that pushes down the small diameter end of the guide shaft;
Recording reproducing apparatus comprising: a.

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