JPH04129032A - Optical recorder - Google Patents

Abstract

PURPOSE:To prevent a friction phenomenon between an optical recording medium and an optical head at the time of taking out the recording medium from the recorder by providing a pressing means for forming a gap between the optical head and the optical recording medium in pressing in the opposite direction to an energizing direction of an elastic supporting material. CONSTITUTION:The recorder is equipped with the pressing means 7 consisting of an operating member 73 and a pressing member 74. Since the gap 8 is formed between the optical head 5 and an optical disk 2 by operating this pressing means 7, the friction phenomenon between the optical disk 2 and the optical head 5 at the time of taking out the optical disk 2 from a recorder housing 1 can be prevented, so that these optical disk 2 and optical head are hardly flawed. By this method, at the time of taking out the optical recording medium, the optical recording medium and the optical head are prevented from coming into contact with each other.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical recording device that records and reproduces information by irradiating an optical recording medium with a beam from a light source such as a gas laser or a semiconductor laser, and particularly relates to This invention relates to an improvement of an optical recording device that allows easy focus control due to surface wobbling of an optical recording medium.

[Conventional technology]

As shown in Fig. 10, this type of optical recording device includes a light source (a) such as a semiconductor laser, a collimator lens (b) that converts the diffused beam from the light source (a) into a parallel beam, and a collimator lens (b) that converts the diffused beam from the light source (a) into a parallel beam. A beam shaping prism (C) converts the beam spot shape from an ellipse to a substantially circular shape, and separates the incident beam entering the optical recording medium (d) from the reflected beam reflected from the optical recording medium (d). a beam splitter (e) that passes through the beam splitter (e) and converts a linearly polarized beam into circularly polarized light (l/4 wavelength plate (f))
an objective lens (g) which is movably provided and converges the beam that has passed through the 174 wavelength plate (f) onto the convergence surface of the optical recording medium (d); and a reflected beam separated by the beam splitter (e). It is known that the main part consists of a cylindrical lens (i) that makes the signal incident on a four-part PIN photodiode (h, ) to obtain a tracking error signal, a focusing error signal, and a reproduced RP multiplied signal. ing.

By the way, in this type of optical recording device, information is recorded in a spiral or concentric manner on the recording layer (not shown) of the optical recording medium (d), and this recorded information is reproduced.
The optical head on which the objective lens (g) etc. are mounted is moved in the radial direction (that is, the track direction) of the optical recording medium (d), and the optical head is moved in order to cope with surface wobbling of the optical recording medium (d). It was necessary to move it in the focus direction.

Therefore, in this type of optical recording device, an optical head (He) is mounted as shown in FIG. 11, and is guided by a guide member (j) in the track direction (arrow X in the figure).
A movable body (k) moves in the direction shown by
A track control driving coil (mt) is attached to the optical head (He) to move and scan the movable body (k) in the track direction when energized; Focus direction (arrow Y in the figure)
A drive system was incorporated, the main part of which was a focus control drive coil (mf) that moved and scanned in the direction indicated by .

However, in an optical recording device incorporating this type of drive system, a drive coil (m[) for focus control is attached to the optical head (He), and the amount of energy is increased. The disadvantage is that the time required to move the optical recording medium to a desired track on the optical recording medium, the so-called access time, becomes long.

Therefore, in recent years, optical recording devices have been developed that perform focus control using airflow accompanying the rotation of an optical recording medium.

That is, this type of optical recording device is shown in FIGS.
as shown in Figure 3, guided by the guide member (j), and
A movable body (k) moves and scans in the track direction as the track control drive coil (mt) is energized, and a spiral spring (n) biases the movable body (k) toward the optical recording medium (d).
), and the main part thereof is composed of an optical head (He) attached via an optical head (He). Because of the configuration in which the optical head (He) is made to float, the distance between the optical recording medium (d) and the optical head (He) is maintained approximately constant despite the surface wobbling of the optical recording medium (d), which prevents focusing errors. This has the advantage that it is less likely to occur, and the optical head (He) is equipped with a focus control drive coil (
Spectroscopic head (He) that eliminates the need to install mf)
It has the advantage that it is lightweight, and as a result, access time can be shortened.

[Problem to be solved by the invention]

By the way, in this type of optical recording device, when the optical recording medium (d) is not rotating, no air flow acts on the optical head (He), as shown in FIG. ) is urged by a spiral spring (n) and pressed against the surface of the optical recording medium (d).

For this reason, as shown in FIG.
When removing and replacing the optical recording medium (d), the contact surfaces of the optical recording medium (d) and the optical head (He) are likely to be scratched due to friction, etc., and the optical recording medium (d) will be replaced within a short period of time. d)
Also, there was a problem that the optical head (He) deteriorated.

The present invention has been made in view of the above problems, and its object is to provide an optical recording device capable of preventing contact between an optical recording medium and an optical head when taking out the optical recording medium. Our goal is to provide the following.

[Means to solve the problem]

That is, the present invention includes a movable body that is placed near a rotating optical recording medium and moves and scans in the radial direction of the optical recording medium, and a movable body that is mounted on the movable body via an elastic support member that urges the optical recording medium toward the optical recording medium. The present invention assumes an optical recording device including an optical head that floats due to the air flow accompanying the rotation of the optical recording medium against the biasing force of the elastic support material, and that converges the beam from the light source onto the convergence surface of the optical recording medium. and is characterized by a suppressing means that presses the elastic support member in a direction opposite to the direction of the urging force to form a gap between the optical recording medium and the optical recording medium supported by the elastic support member. That is.

Regarding the optical head mounted on the above-mentioned movable body in such a technical means, this technical means "hole drilling is a mold",
When applied to an optical recording device such as the bubble type 1.1 phase change type 1, there is a floating body that floats due to the air flow accompanying the rotation of the optical recording medium, and a light source attached to the optical path opening of the floating body. The main part of the optical recording medium is an objective lens that converges the beam onto the convergence surface of the optical recording medium.However, when this technical means is applied to an optical recording device of r magneto-optical recording type 1, The main parts of the floating body include the floating body, the objective lens, and a magnetic field generating means such as a coil that is attached near the optical path opening of the floating body and forms a magnetic field toward the convergence surface of the optical recording medium. It is.

It should be noted that the floating body needs to be provided with at least a slider surface and an air introduction surface on its bottom side in order to efficiently receive the floating pressure from the optical recording medium. Further, for the purpose of stabilizing the floating movement of the floating body, a groove for letting air escape, that is, a central relief part, may be formed along the length of the floating body. In this case, the number and shape of the grooves can be arbitrarily set depending on the purpose.

In addition, regarding the elastic support member for attaching the optical head to the movable body, while urging the optical head toward the optical recording medium, the optical head is also pushed by the air flow accompanying the rotation of the optical recording medium against this urging force. Any configuration can be used as long as it can be supported in a floating manner and does not block the beam from the light source. For example, a spiral spring or a plate spring can be used.

On the other hand, as a pressing means for pressing this elastic support material in a direction opposite to the urging direction thereof, the pressing means selectively contacts a part of the elastic support material and pushes this elastic support material in a direction opposite to the urging direction. Any structure can be used as long as it can be deformed to form a gap between the optical head supported by the elastic support member and the optical recording medium.

[Effect]

According to such technical means, a pressing means is provided that presses the elastic support member in a direction opposite to the urging direction thereof to form a gap between the optical head and the optical recording medium supported by the elastic support member. Therefore, when the optical recording medium is removed from the apparatus, it is possible to prevent the phenomenon of rubbing between the optical recording medium and the optical head that is biased in this direction.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

That is, the optical recording apparatus according to this embodiment is shown in FIGS.
As shown in FIG. 6, there is a recording device housing (1), a movable body (3) disposed near the optical disk (2) inside the housing (1), and a spring material (4) attached to the movable body (3). The optical head (5) mounted via the movable body (3)
) in the track direction of the optical disk (2), and a pressing means (7) that presses the spring member (4) in a direction opposite to its biasing direction. It is configured.

First, the movable body (3) is composed of a pobin-less driving coil (30) formed by bonding wound coils with epoxy adhesive and integrally molding them, as shown in FIGS. 3 and 6. A coil body (32) formed into an elliptical cylinder shape and having a substantially square opening (31) on the side facing the optical disk (2), and a portion where the opening (31) is formed in the coil body (32). It consists of a pair of reinforcing coil walls (35) that are provided at A mirror (36) for introducing a laser beam from a light source (not shown) toward the optical disk (2) is arranged on the inner wall surface facing the opening (31).

On the other hand, the optical head (5) floats due to the air flow accompanying the rotation of the optical disc (2), and has an optical path opening (
A floating body (51) made of alumina ceramics has an opening (50) and an optical path opening (51) of this floating body (51).
A plastic objective lens (52) is attached to the floating body (51) and is attached to the floating body (51) to converge the laser beam from the light source onto the converging surface of the optical disc (2).
The air inflow end and air outflow end of the surface facing the optical disk (2) are tapered (
53) (54) is provided, and a central relief portion (56) is provided approximately at the center of the slider surface (55) to stabilize the floating running of the optical head (5), and an optical disk (54) is provided. 2) is attached to the opening (31) of the movable body (3) via a phosphor bronze spring member (4) that urges it toward the side.

The drive unit (6) also includes an aluminum carriage (60) attached to the bottom side of the movable body (3), and this carriage (60) is fitted to move the movable body (3) to the optical disc (2). Linear bearing (61
), a pair of pure iron magnetic yokes (63) (63) inserted into the insertion portion (34) of the movable body (3) and arranged across the track direction of the optical disk (2), 63) An arc-shaped magnet (64) arranged along the length of (63) and formed of a rare earth iron permanent magnet.
) (64), a pure iron magnetic holder (65) that holds these magnets (64) (64), and a pure iron magnetic holder (65) that supports the entire members such as the carriage (60) and the linear bearing (61). Its main part is composed of a magnetic fixing table (66).

Further, the pressing means (7) is disposed within the housing (1), and its main portion consists of an operating member (73) and a pressing member (74) connected via bevel gears (71) and (72). It is configured.

That is, as shown in FIGS. 1 and 2, the operating member (73) is composed of a rod having a substantially circular cross section, and a portion of the base end thereof is an opening provided in the housing (1). (not shown), and an operating piece (75) is attached to the end thereof so as to be rotatable, while a bevel gear (71) is attached to the tip side thereof. ing.

The pressing member (74) is made of a rod having a substantially circular cross section as shown in FIGS. ) is attached to a bevel gear (72) that is rotatably formed, and has a generally elliptical cross section on its tip side that selectively abuts a part of the spring material (4). Pressing part (76)
is provided.

Then, by operating the operating member (73), as shown in FIG. 4(A).
~ When the operating piece (75) is lowered as shown in (B),
The bar rotates 174 times, and this rotational force is transmitted to the bevel gear (71
) (72) to the pressing member (74), this rod also rotates 174 times, and with this rotation, the pressing member (76)
) is separated from the spring material (4) and becomes open, so the optical head (5) is urged by the spring material (4) and pressed against the surface of the optical disk (2) as in the conventional case.

On the other hand, by operating the operating member (73), FIG.
When the operating piece (75) is raised as shown in (B), the bar rotates 1/4 in the opposite direction, and this rotational force is applied to the pressing member (74) via the bevel gears (71) (72). As a result, this bar material also rotates 1/4 in the opposite direction, and with this rotation, the pressing portion (76) comes into contact with a part of the spring material (4) and becomes pressed, so that the spring material (4) The optical head (5) and the optical disk (2) are deformed in the opposite direction to the biasing direction.
A gap (8) is formed between them.

In the optical recording device configured in this way, the movable body (3) is moved in the track direction of the optical disk (2) by the electromagnetic force accompanying the energization of the drive coil (30), as in conventional devices. Along with this, the optical head (5) is also moved and scanned to perform track control, while focus control is performed using the floating phenomenon of the optical head (4).

Here, in this optical recording device, the operation member (73
) and a pressing member (74), and by operating this pressing means (7), a gap (8) is formed between the optical head (5) and the optical disc (2). is formed, it is possible to prevent the rubbing phenomenon between the optical disc (2) and the optical head (5) when taking out the optical disc (2) from the recording device housing (1), This has the advantage that the head (5) is less likely to be damaged.

In this embodiment, the pressing means (7) is connected to the operating member (7) connected by a pair of bevel gears (71) and (72).
3) and a pressing member (74), for example,
As shown in FIG. 8, there is a highly rigid plate-shaped pressing member (74) whose base end is a rotation fulcrum (70) and whose distal end swings in the vertical direction, and the rotation of this pressing member (74). Dynamic fulcrum (
70), which is attached to the pressing member (74) and always applies a rotational force in the direction of the arrow; and a biasing member (not shown) having a generally elliptical cross section that engages with the lower surface of the base end side of the pressing member (74). The operating member (73) constitutes a pressing means (7),
As shown in FIG. 9, a structure may be adopted in which the pressing member (74) is swung by rotating the operating member (73) to form a gap (8) between the optical disc (2) and the optical head (5). Of course it's good.

〔Effect of the invention〕

According to the present invention, since the pressing means is provided which presses the elastic support member in a direction opposite to the biasing direction thereof to form a gap between the optical head and the optical recording medium supported by the elastic support member, When taking out the optical recording medium from the apparatus, it is possible to prevent the phenomenon of rubbing between the optical recording medium and the optical head that is biased in this direction.

Therefore, it has the effect of making the optical recording medium and the optical head less likely to be scratched.

[Brief explanation of drawings]

1 to 9 show embodiments of the present invention, in which FIG. 1 is a schematic overall perspective view of an optical recording device according to the embodiment, and FIG.
The figure is a partially enlarged view, Figure 3 is a sectional view taken along the ■-■ plane in Figure 2, and Figures 4 (A) and 5 (A) are IV-IV in Figure 2.
4(B) and 5(B) are front views of the operation piece, and FIG. 6 is a cross-sectional view of the optical recording device in a state in which the pressing means, optical head, and spring material are omitted from FIG. 2. FIG. 7 is a partially omitted perspective view of a pressing member in a pressing means, FIG. 8 is a schematic perspective view of a pressing means according to another embodiment, and FIG. 9 is an explanatory diagram of its operation. , Figure 10~
FIG. 15 shows a conventional example, FIG. 10 is an explanatory diagram of the configuration of a conventional optical recording device, FIGS. 11 to 12 are partial perspective views of a conventional optical recording device, and FIG. 13 to FIG. FIG. 14 is a sectional view along the xm-xm plane of FIG. 12, and FIG. 15 is an overall perspective view of the optical recording device. [Explanation of symbols] (2)...Optical disk (3)...Movable body (4)...Spring material (5)...Optical head (7)...Pushing means patent Applicant: Fuji Xerox Representative Co., Ltd.
Patent Attorney Tomohiro Nakamura (2 others) Figure 10 Figure 11q Figure 12 Figure 13 Figure 14

Claims (1)

[Scope of Claims] A movable body disposed near a rotating optical recording medium and moved and scanned in the radial direction of the optical recording medium, and an elastic support member that urges the movable body toward the optical recording medium. In an optical recording device, the optical recording device includes an optical head which is mounted on the optical recording medium and floats by an air flow accompanying the rotation of the optical recording medium against the biasing force of the elastic support member, and which converges a beam from a light source onto a convergence surface of the optical recording medium. , an optical device characterized in that a pressing means is provided for pressing the elastic support member in a direction opposite to the urging direction thereof to form a gap between the optical head and the optical recording medium supported by the elastic support member. Recording device.