JP2637292B2 - Optical information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus having at least one of a function of reading information recorded on a data track on a recording medium and a method of optically recording information on the recording medium. It relates to the configuration of the device.

[0002]

2. Description of the Related Art Conventionally, a pin for connecting a base and a carriage is made of a rigid body, and the pin is fixed to one of a hole provided in a base and a carriage by press-fitting or adhesively fixing the pin. The hole has a structure in which a slight clearance is provided and the hole is slidably supported.

[0003]

As described above, in the conventional optical information recording / reproducing apparatus, the pins are fixed by press-fitting or adhesively fixed. It was very difficult to separate the base from the carriage.

[0004] Further, since there is a clearance on the other hole side, there is a problem that sound is apt to be skipped at the time of reproduction and erroneous recording is easily caused at the time of recording due to external vibration or impact.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can be easily assembled and disassembled, and has improved recording and reproducing performance against vibrations and shocks. The aim is to obtain a device.

[0006]

Means for Solving the Problems An optical information recording and reproducing apparatus according to the present invention, an objective lens for focusing the light emitted from the light source optical unit on the optical storage medium, an actuator unit for driving the objective lens , A sensor optical unit for detecting reflected light from an optical storage medium , a light source optical unit, and an actuator
It includes a data portion and base where the signal connection board unit for transmitting and receiving signals mounted between the sensor optical section, the base
The base is supported on a movable carriage, and the base and
Each of the carriages is provided with a pair of support holes.
Over scan to when to engage the carriage portion, shrink away Puringupin which have a stretchable spring of radially substantially cylindrical
Insert the base into the support holes of the base and carriage
After being inserted, it opens in the radial direction
The base can swing without clearance with respect to the carriage
The base is supported by a tilt adjustment spring.
Energized against ridge, base against carriage
Swing angle is regulated by the amount of rotation of the tilt adjustment screw
Things.

[0007]

The optical information recording / reproducing apparatus according to the present invention comprises:
The light emitted from the light source optical unit is focused on the optical storage medium by the objective lens, the objective lens is driven by the actuator unit, the reflected light from the optical storage medium is detected by the sensor optical unit, and the signal of each part is Transmission and reception are performed by a signal connection board portion mounted on the base, the base is moved by the carriage portion, and the carriage and the base are swingably connected by pins having a spring property in a radial direction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 3 is a diagram for explaining the arrangement of the optical system.

In the figure, a collimator lens (2) for converting a laser beam into a parallel light beam is disposed on an optical path of a semiconductor laser (1) for emitting a laser beam, and a polarized beam is provided downstream of the collimator lens (2). A splitter (3) is arranged.

The polarizing beam splitter (3) is provided with a quarter-wave plate (4), and a reflection mirror for reflecting a laser beam at a right angle downstream of the optical path of the quarter-wave plate (4). (5) and (6) are arranged.

Further, an objective lens (7) is disposed downstream of the reflection mirror (6) in the optical path, and the objective lens (7) is provided.
An optical recording medium (8) rotated by a motor (not shown) is provided.

On the other hand, a convex lens (9), a concave lens (10) and a cylindrical lens (11) are arranged in this order on the optical path deflected almost at right angles by the polarizing beam splitter (3). A first photodetector (12) is disposed downstream of the optical path.

[0014] In such optical system, the semiconductor laser (1) release from Isa laser beam (13a) is converted to a substantially parallel light flux by a collimator lens (2), a polarization beam splitter (3), 1 / The light passes through the four-wavelength plate (4), is bent twice at substantially right angles by the reflection mirrors (5) and (6), enters the objective lens (7), and forms a light spot on the optical recording medium (8). .

Then, the light beam (13b) reflected by the optical recording medium (8) travels in a direction opposite to the incident light so that the objective lens (7), the reflection mirrors (6) and (5), and the quarter-wave plate It passes through (4) and is reflected at right angles by the polarizing beam splitter (3).

Then, the reflected light (13c) passes through a convex lens (9), a concave lens (10), and a cylindrical lens (11), and is received by a first photodetector (12).

Here, the first photodetector (12) detects the information on the optical recording medium (8) and, at the same time, determines the distance between the optical recording medium (8) and the objective lens (7). The amount of deviation between a track (not shown) on the optical recording medium (8) and the light spot is detected, and the objective lens (7) is moved in the optical axis direction (Z direction) and a direction substantially orthogonal to the track according to the detected amount. (X direction).

The optical information recording / reproducing apparatus of the present invention is roughly divided into an optical pickup section (105) and a carriage section (106). The optical pickup section (105) is designed to realize the above-described arrangement of the optical system. The optical pickup unit (10) is composed of a light source optical unit (101), a sensor optical unit (102), an actuator unit (103), a signal connection board unit (104), and a main body base (24) for fixing the above parts.
5) is configured to be mounted on the carriage unit (106) and movable in the radial direction (x direction). Hereinafter, the description will be made separately for each unit.

FIG. 2 is a block diagram of the optical pickup unit.
(14) is a light source holder, (15) is a high frequency superimposed circuit case, (16) is a lid of the high frequency superimposed circuit case, (17)
a) and (17b) are high-frequency superimposed circuit boards, (18) is a feedthrough capacitor, and (19a), (19b) and (19c) are fixing screws for fixing to the main body base (24).

FIG. 4 is a cross-sectional view of the light source unit holder. The light source unit holder (14) is formed of a cylindrical body, and the semiconductor laser (1) is press-fitted and fixed so as to close one end opening as shown in the figure. A collimator lens (2) is adhesively fixed so as to close the opening at the other end.

The semiconductor laser over THE (1) a high-frequency superimposing circuit board (1 so as to sandwich the high frequency superimposing circuit case (15)
7a), three lead wires are soldered, and the high frequency superimposed circuit case (15) is fixed to the main body base (24) by fixing screws (19a) and (19b), whereby the semiconductor laser (1) is connected to the main body base. It is fixed so that it can be pressed.

The high frequency superimposed circuit board (17b) is fixed to the main body base with fixing screws (19c), and is connected to the high frequency superimposed circuit board (17a) by a feedthrough capacitor (18).

Then, the lid (1) of the high-frequency superposition circuit case
6) to reduce unnecessary radiation.
Incidentally, the high-frequency superimposing circuit board (17b) is attached volume (not shown), it is possible to set the optimum frequency superimposing level.

102: Sensor optical unit In FIG. 2, (20) is a convex lens holder, (21) is a sensor lens holder, (22) is a fixing spring, and (23) is a fixing screw.

FIG. 5 is a sectional view of the sensor optical unit. In the figure, the convex lens holder (20) is a cylindrical body, and the convex lens (19) is adhered and fixed.

The sensor lens holder (21) is also a cylinder, and has a concave lens (10) and a cylindrical lens (1).
1) is adhesively fixed. In the main body base (24), the portion where the sensor optical section is mounted is coaxially processed as shown in the figure, and the central axes of the convex lens holder (20) and the sensor lens holder (21), that is, the convex lens (9) and the concave lens (10). ), The optical axis of the cylindrical lens (11) is aligned.

Further, the sensor lens holder (21) has a structure longer than the thickness of the two lenses, and the sensor lens holder (2) is formed by a wider plate-shaped fixing spring (22).
Since the flat surface formed on the cylindrical surface in 1) is pressed and fixed, the optical axis is hardly inclined when the sensor lens holder (21) is adjusted in the optical axis direction.

103: Actuator section The lens holder (25) for holding the objective lens (7) is
Through a bearing part (25a) formed in the center with high precision,
The support shaft (26) is fitted so as to be rotatable in the rotational direction and slidable in the axial direction.

The lens holder (25) includes a balancer (27) having a hole in the center, one focus control coil (28) and two track control coils (29).
a) and (29b) are adhesively fixed.

FIG. 6 is an explanatory view of a structure in which the first relay board is attached to the lens holder. As shown in FIG. 6, the focus control coil (28) and the track control coils (29a), (29) The first relay board (31) for soldering the wiring of (29b) and the four lead wires (30) for power supply includes a convex part (25b) on the lens holder (25) and an arc (25c) of the bearing part. ) Is positioned and pasted.

The second relay substrate (33), a reflecting mirror (5), 1/4-wave plate (4), the polarization beam splitter (3), the base to cover the optical components such as lens (9) ( 24) is fixed with one boss and one screw (32), and the lead wire (30) coming out of the first relay board ( 31 ) is soldered to the second relay board (33). Have been.

The focus control coil (28) is provided with a notched focus control yoke (34) and a radially magnetized N
The objective lens (7) is arranged in a magnetic circuit formed by focus control magnets (35a) and (35b) made of a d-Fe plastic magnet, and is supplied with a required current through the focus control coil (28). In the shaft sliding direction (z
Direction).

The track control coil (29)
a) and (29b) are track control yokes (36).
a) and (36b) and a track control magnet (37) made of a Nd-Fe plastic magnet magnetized in two poles.
a) and (37b) are arranged in a magnetic circuit.
By passing a required current through the track control coils (29a) and (29b), the shaft rotation direction (θz direction)
It is possible to rotate the objective lens (7).

The support shaft (26) protrudes from the bottom surface of the focus control yoke (34) and is press-fitted or bonded to the focus control yoke (34). The support shaft (26) protruding from the bottom surface is used for positioning and fixed to the base (24).

Furthermore, a disc-shaped stopper (38) made of rubber or plastic is disposed on the focus control yoke (34) through the support shaft (26), and the lens holder (25) is attached to the stopper (38). ) And restricts the amount of movement below the shaft sliding direction (z direction), which is also effective in silencing during a collision.

[0036] The base lens holder (25) supporting rubber which is elastically supported (39), in the mounted on the lens holder (25) with square holes at two points and also a round hole in the X4 It is fitted into the boss provided in (24).

Further, semicircular projections (39a) and (39b) are provided on a part of the base-side fixing portion of the support rubber (39), and the side surface of the lens holder (25) collides therewith. By doing so, the amount of rotation in the shaft rotation direction (θz direction) can be regulated.

Next, the mechanism for detecting the position of the objective lens in the axis rotation direction (θz direction) will be described.

The position detecting mechanism is connected to the base (2) via the substrate.
4) A light emitting diode (4), which is a substantially parallel light source unit, fixed from the back side with two screws (40a) and (40b).
1) The balancer used as an aperture (2)
7) and the balancer (27) are replaced by light emitting diodes (41)
The second photodetector (4
The spot which has passed through the hole of the balancer (27) on the second photodetector (42) also moves with the rotation of the lens holder (25).

The second photodetector (42) is a two-divided photodetector in which a dividing line is perpendicular to the spot moving direction, and can obtain a position detection signal of the objective lens (7) based on a difference signal of each output. it can.

The aluminum substrate (43) to which the second photodetector (42) is attached has two U-shaped notches (43a) and (43b), and the boss of the base (24). By fitting to (24e) and (24f), y
The initial position is adjusted by performing positioning in the direction and moving in the x direction, and thereafter, adhesively fixed.

Then, three covers (44) are provided so as to cover the actuator parts other than the aluminum substrate (43), the second relay substrate (33) and the optical components arranged in the space on the base (24). Screws (45a), (45b),
It is fixed to the base (24) by (45c).

Further, the cover (44) is configured to collide with the upper end of the bearing portion (25a) when the lens holder (25) moves upward in the shaft sliding direction (z direction). It is possible to regulate the amount of upward movement (in the z direction).

104: Signal connection substrate part D High-frequency superimposed substrates (17a) and (17b), semiconductor laser (1), first photodetector (12), second photodetector (4
2) The light emitting diode (41) and the actuator
It is necessary to supply a voltage and a current and to take out a signal voltage. A signal connecting board (46), which is a single flexible board, is provided on the bottom and side surfaces of the base (24) so that these can be covered by one connector. It is connected to each of the above parts.

The signal connection board (46) is connected to the base (2).
Near the exit of 4), two bosses (24
a) and (24b) are fitted with holes (46a) and (46b), and a plastic holding plate (4
7) is fitted into the bosses (24a) and (24b) and fixed so as not to float from the base (24).

In the signal connection board (46), the connection portion with the light emitting diode (41) is made of a glass epoxy board (46).
c) is heat-sealed, an aluminum substrate (46d) is heat-sealed at the connection with the first photodetector (12), and (46e) is mounted on the high-frequency superimposed circuit board (17a). Is soldered via a feedthrough capacitor (18).

Three leads (48) coming out of the second photodetector (42) and four leads (49) coming out of the second relay board (33) are shown. It is soldered on the land of the signal connection board (46) on the back side of the base (24) through the hole on the bottom surface of the base (24).

FIG. 1 is a structural view showing an optical information recording / reproducing apparatus according to the present invention. In the figure, a carriage (52) has two linear ball bearings (55a) and (55b) interposed therebetween. Is fixed to the C-ring via a spring (56), and both ends are fixed by C-rings (57a) and (57b).

On the other hand, on the side opposite to the linear ball bearings (55a) and (55b) across the optical pickup section (105) on the carriage (52), substantially the center of the linear ball bearings (55a) and (55b) is located. Radial ball bearing (58) at the same height with eccentric pin (59)
Through an eccentric pin (5)
At the other end of 9), a ring (61) is fitted into the radial ball bearing (58) to prevent it from coming off.

Further, the carriage (52) is provided with holes (52c) and (52d) for fixing a linear drive coil (not shown) by screws, so that the linear drive coil attached to the bottom surface of the carriage (52) is provided. The signal connection substrate (4) is connected to the portion (62a) via the coil substrate (62).
6) Soldered.

As described above, the carriage is not shown by the two linear ball bearings (55a) and (55b) and one radial ball bearing (58).
The book can be moved smoothly on the parallel axis in the radial direction (x direction).

Further, even when the pickup section (105) is attached to the carriage section (106), the carriage (5) is not used.
Through the hole (52a) of 2), the sensor lens holder (2
The position adjustment of 1) is possible.

Next, a method for connecting the optical pickup unit (105) and the carriage unit (106) and a method for adjusting the tilt angle will be described.

In FIG. 1, the optical pickup unit (105)
Are holes (24c) provided on a line connecting the center of the objective lens (7) of the base (24) and the center of the support shaft (26),
In (24d), two spring pins (51a) and (51b) having a C-shaped cross section are inserted through holes (52a) and (52b) on the position straight line of the carriage (52) and θ.
It is fixed so as to be rotatable only in the y direction.

Then, the optical pickup section (105)
The tilt angle of the optical pickup unit (105) can be adjusted in the radial direction (θy direction) according to the rotation amount of the tilt angle adjusting screw (54) from below the carriage (52) via the tilt angle adjusting spring (53). ing. Further, an eccentric pin (5) to which a radial ball bearing (58) is attached is attached.
By rotating 9), the tilt angle of the carriage unit (106) on which the optical pickup (105) is attached can be adjusted in the jitter direction (θx direction).

Next, in FIGS. 7 and 8, the base (2
4) and a method of assembling the carriage (52) will be described.

The holes (24c) and (24d) of the base are almost aligned with the holes (52a) and (52b) of the carriage, and the spring pins (51a) and (51b) are set in FIG.
In the direction of the arrow.

Then, the spring pin contracts in the radial direction from the tapered portions (51c) and (51d) provided on the spring pin (51), and the hole (52) of the carriage is formed.
a), (52b), followed by a hole (24) in the base.
c) and (24d).

The spring pins (51a), (51)
The outer diameter of b) is, in its natural state, a hole (24c) in the base,
(24d) and carriage holes (52a), (52b)
The base holes (24c), (24c)
d) and when inserted into the holes (52a) and (52b) of the carriage, and contracts when the spring pins (51a) and (51b) are inserted.
The shear load in the radial direction of b) is set to 90 kgf or more.

Further, no clearance is generated when the pin is inserted into the holes (24c), (24d), (52a) and (52b) by the spring force of the spring pin.

FIG. 9 shows a case where the optical information recording / reproducing apparatus is a CD.
Shown below is the data of the impact resistance test when incorporated into the player and played back. The test is based on data that tests how many cm up to which height the sound does not skip when the soft tennis ball is dropped to a certain position on the CD player. is there.

The horizontal axis of the figure shows the shearing load of the spring pin, and the vertical axis shows that when a soft tennis ball is dropped,
Indicates the height at which sound skips.

In the figure, white circles (0) indicate conventional rigid pins. With conventional pins, sound skipped at a height of about 12 cm, but with a shear load of 60 Kgf, the height has been improved to a height of 30 cm, and it has been found by tests that a sharp improvement is obtained with a shear load of 90 kgf or more. .

[0064]

As described above, according to the present invention, the base and the carriage are connected by a substantially cylindrical spring pin having spring properties in the radial direction, so that the base and the carriage can be easily assembled and disassembled. At the same time, since there is no clearance between the spring pin and the hole, a device with improved performance against vibration and impact can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an optical information recording / reproducing apparatus according to the present invention.

FIG. 2 is a configuration diagram of a pickup unit.

FIG. 3 is a perspective view illustrating an arrangement of an optical system.

FIG. 4 is a cross-sectional view of a light source unit holder.

FIG. 5 is a sectional view of a sensor optical unit.

FIG. 6 is an explanatory diagram of a structure in which a first relay substrate is attached to a lens holder.

FIG. 7 is a cross-sectional view showing a coupling portion between the base and the carriage.

FIG. 8 is a view showing the shape of a spring pin.

FIG. 9 is data showing the results of an impact test.

[Explanation of symbols]

(7) Objective lens (8) Optical recording medium (24) Base (51a), (51b) Spring pin (101) Light source optical section (102) Sensor optical section (103) Actuator section (104) Signal connection board section ( 105) Optical pickup unit (106) Carriage unit

Claims (1)

(57) [Claims] An objective lens for condensing light emitted from a light source optical unit on an optical storage medium; an actuator unit for driving the objective lens; a sensor optical unit for detecting reflected light from the optical storage medium; An optical information recording / reproducing apparatus including a base on which a signal connection substrate unit for transmitting / receiving signals to / from a light source optical unit, an actuator unit, and a sensor optical unit is mounted, and the base is supported by a movable carriage unit. , The base and the carriage portion each have a pair of support holes.
Is provided to engage the base with the carriage portion
In some cases, a spring pin having a substantially cylindrical shape and having a spring property capable of expanding and contracting in a radial direction is compressed in the base and the cap.
Insert into each support hole of the ridge, and after insertion,
By opening the base in the radial direction, the base
Swingable without clearance to the
The base is attached to the carriage by a tilt adjustment spring.
The base with respect to the carriage portion
An optical information recording / reproducing apparatus characterized in that the swing angle of the optical information recording / reproducing device is regulated by the rotation amount of the tilt adjusting screw .