JPH04121060U - Information recording/playback device - Google Patents

Abstract

(57) [Summary] [Purpose] An information recording/reproducing device that effectively suppresses guide rail resonance, reduces optical system vibration, and effectively improves servo characteristics, information signal S/N, etc. I will provide a. [Structure] A guide rail that is arranged to extend in a direction parallel to the recording medium and substantially orthogonal to the information track, and fixed to the base by spaced apart first and second fixing parts 35a, 35b, 36a, and 36b. Record and/or record information in accordance with 26a, 26b.
Alternatively, in an information recording/reproducing apparatus in which at least a part 25 of the optical system for reproduction is moved back and forth, the guide rails 26a, 26b are connected to the first and second fixed parts 35.
A, 35b, 36a, 36b, and is fixed to the base via elastic means 37 at a position spaced apart from the first and/or second fixing part 35a, 35b, 36a, 36b.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is useful for recording media such as optical disks, magneto-optical disks, and optical cards. The present invention relates to an information recording/reproducing device that records and/or reproduces information.

0002

[Conventional technology]

In an information recording/reproducing device, an optical system is generally used to record/reproduce information. supported on a guide rail, and driven almost orthogonally to the information track using a linear motor, etc. For example, in the case of disc-shaped recording media, the radial direction of the disc is I'm trying to move it back. In addition, as a method for moving the optical system, a light source such as a semiconductor laser or a photodetector is used. An integrated optical system that moves all optical systems together, and for high-speed readout. Only the minimum necessary optical system such as an objective lens is installed on the movable part, and the remaining light source and light detection There is a separate optical system system in which the optical system including the instrument is installed in a fixed part, reducing the weight of the movable part. Ru.

0003 As the above-mentioned separation type optical system method, for example, Japanese Patent Application Laid-open No. 140646/1983 describes , fix the two guide rails to the frame member at two places each, and connect the two guide rails between the two fixed parts. Move the movable optical part along the guide rail and move it away from the fixed part. A fixed optical part is placed at one end of the guide rail between the two, and a rotating disc is placed at the other end. A system in which two spindle motors are each fixed is disclosed. In addition, in the 1990 spring edition 30a-G-6, one end of one guide rail is held through a fixed optical part, and is movable along its free end and the other guide rail. A device in which the optical part is moved is disclosed.

0004

[Problem that the idea aims to solve]

However, in conventional information recording/reproducing devices, the guide rail is simply Because it is fixed to the base, the spindle motor and objective lens actuator When some disturbance such as motor vibration or external vibration acts on the guide rail, the vibration If the dynamic frequency matches the resonant frequency of the guide rail, the guide rail will vibrate greatly. As a result, the servo characteristics of the optical system deteriorates, and the S/N of the information signal decreases. There is a problem.

[0005] In particular, for those that adopt a separate optical system method, vibrations of the guide rail may cause This may cause optical axis misalignment between the movable optical section and the fixed optical section, or the guide rail may A case where the fixed optical part and the movable optical part are positioned by fixing them to the fixed optical part. In this case, the vibration of the guide rail acts directly on the fixed optical part, so the above problem becomes more serious. It becomes better.

[0006] This idea was made by focusing on the problems of the conventional methods mentioned above. can effectively suppress the resonance of the optical system, thereby reducing the vibration of the optical system and improving the Information recording/recording system appropriately configured to effectively improve signal characteristics and S/N of information signals, etc. The purpose is to provide a playback device.

[0007]

[Means to solve the problem]

In order to achieve the above purpose, in this invention, the information a first fixed part extending in a direction substantially perpendicular to the track and spaced apart; Record information along the bar-shaped guide rail fixed to the base by the second fixed part. At least a part of the optical system for recording and/or playback is moved back and forth. In the information recording/reproducing device, A region that does not include between the first fixing part and the second fixing part, and The guide rail is elastically moved at a position spaced apart from the fixed part and/or the second fixed part. It is fixed to the base via sexual means.

[0008]

[Effect]

That is, in this invention, as shown in FIG. It is supported on the base 3 at two places by b. Here, when the guide rail 1 vibrates, The amplitude is small at the pressers 2a and 2b, and increases as the distance from the pressers 2a and 2b increases. Since the amplitude becomes large, even if elastic means are interposed between the pressers 2a and 2b, The damping effect is low because the absorption of energy is small. Therefore, in this invention, from the presser 2b in the area that does not include the area between the pressers 2a and 2b. The guide rail 1 is moved by elastic means at a distant position, that is, a position where the vibration amplitude becomes large. 4 to the base 3. With this configuration, a high vibration damping effect can be obtained. , since the resonance of the guide rail 1 can be effectively suppressed, it is possible to move to the guide rail 1. It can effectively reduce the vibration of the optical system supported by the Optical axis misalignment between the fixed optical section and the movable optical section can be effectively reduced. Therefore, It is possible to effectively improve the turbo characteristics and the S/N ratio of the information signal. In addition, presser 2 The distance between b and the position where it is fixed via the elastic means 4 depends on the rigidity of the guide rail 1 and It is set appropriately depending on conditions such as the rigidity of the elastic means 4.

[0009]

【Example】

FIG. 2 shows a first embodiment of this invention. This example uses a separate optical system. A method for recording and/or reproducing information on a magneto-optical disk. be. The fixed optical part 11 is fixedly provided on a base (not shown), and the fixed optical part 11 is Semiconductor laser 12, collimator lens 13, beam shaping lenses 14a, 14b, prism 15, beam splitter 16, condenser lens 17, 1/2 wave plate 18, polarizing beam splitter 19 and light receiving elements 20, 21 are provided, and a cover is provided to cover the entire fixed optical system. A bar 22 is provided. In addition, the movable optical section 25 is movable in the radial direction of a magneto-optical disk (not shown). The movable optical section 25 is supported by guide rails 26a and 26b, and a reflecting mirror (not shown) is mounted on the movable optical section 25. , an objective lens 27, an objective lens actuator (not shown) and a pair of coils 28 a,28b are provided. Furthermore, the base has a pair of yokes 29a, 29b and a permanent magnet 30a, which is connected to each yoke. 30b, and the pair of yokes and permanent magnets and the pair of movable optical parts 25 are connected to each other. The movable optical section 25 is driven by electromagnetic interaction with the coils 28a and 28b.

0010 In this way, the light from the semiconductor laser 12 is passed through the collimator lens 13 to form the beam. fixed optical section 11 via lenses 14a, 14b, prism 15 and beam splitter 16. The light is emitted from the movable optical section 25, and the fixed optical section 11 is emitted from the movable optical section 25. The incident light is projected onto a magneto-optical disk through a reflecting mirror and an objective lens 27. I will do it. In addition, the reflected light from the magneto-optical disk passes through the objective lens 27 and the reflection mirror. The light is emitted from the dynamic optical section 25 and enters the fixed optical section 11, and the beam is emitted in the fixed optical section 11. beam splitter 16, condenser lens 17, 1/2 wave plate 18 and polarizing beam splitter 19 The polarized light components perpendicular to each other are received by the light receiving elements 20 and 21.

[0011] In this embodiment, the pair of guide rails 26a and 26b are each placed at two locations on the base. The rail abutting parts 33a, 34a and 33b, 34b provided on the b, 36b to secure it to the base. Also, the guide rail on the presser foot 36a, 36b side The ends of the wheels 26a, 26b are extended to the inside of the fixed optical part 11, and the ends of the wheels 26a, 26b are These dampers 37 are each passed through dampers 37 made of rubber material, as shown in detail in FIG. In the fixed optical part 11, the fixed optical part 11 is fitted into a housing 38 formed on the fixed optical part 11. By pressing with the cover 22, the guide rails 26a, 26b are separated from the pressers 36a, 36b. The separated end is fixed to the base via the damper 37.

0012 With this configuration, a high vibration damping effect can be obtained by the damper 37, and the guide rail can be Since the resonance of the guide rails 26a, 26b can be effectively suppressed, it is possible to move to the guide rails 26a, 26b. Vibration of the movable optical section 25 supported by the movable optical section 25 can be effectively reduced. therefore, Since the optical axis misalignment between the fixed optical section 11 and the movable optical section 25 can be effectively prevented, Servo characteristics, S/N of information signals, etc. can be effectively improved.

[0013] FIG. 4 shows the configuration of the main part of a second embodiment of this invention. This example is In the first embodiment, the damper 37 has a cylindrical shape, and the housing 38 has a cylindrical shape. The pump receiving part is V-shaped. According to this embodiment, a gap is created between the damper 37 and the housing 38, and Since the contact area of the guide rails 26a and 26b can be reduced, the amount of displacement of the guide rails 26a and 26b can be increased. Therefore, a higher vibration damping effect can be obtained.

[0014] FIG. 5 shows a third embodiment of the invention. This example uses two guides. Hold the rails 26a, 26b in two places with 35a, 36a and 35b, 36b. It is fixed to the base via the rail abutting parts 33a, 34a and 33b, 34b, and the guide The fixed optical part 11 is fixed to one end of the guide rails 26a, 26b. 26b has been applied to a type of optical system used for positioning. Therefore, in this embodiment, the other end of the guide rails 26a, 26b is held down by the presser 35a, When extending from 36a to the spindle motor 41 side for rotating the magneto-optical disk, Both ends have dampers 37 passed through them as shown in detail in FIG. is fitted into the housing 42 provided on the base and pressed and clamped with the damper holder 43. , the ends of the guide rails 26a, 26b that are separated from the pressers 35a, 35b are pressed against the damper 37. It is fixed to the base through. The rest of the configuration is the same as the first embodiment, and the same reference numerals are the same. Indicates something that has an effect. Note that in this embodiment, the light from the semiconductor laser 12 is I use a shaping prism 44 to shape it.

[0015] That is, the fixed optical part 11 is directly fixed to the guide rails 26a, 26b as described above. , when using guide rails 26a and 26b for positioning the optical system, 26a, 26b and the fixed optical part 11 must be tightly fitted, so it is necessary to tighten the fit between Even if the guide rails 26a and 26b are extended to the fixed optical part 11 side, the amount of displacement at the end will be It's small and you can't expect much of an effect. However, as in this example, the Extend the ends of the idle rails 26a, 26b on the spindle motor 41 side and If it is fixed to the base via the pump 37, the amount of displacement will be large at these ends. Therefore, a high vibration damping effect can be obtained.

[0016] FIG. 7 shows the configuration of the main part of the fourth embodiment of this invention. This example is In the third embodiment, the damper 37 has a cylindrical shape, and the housing 42 has a cylindrical shape. The damper receiving part and the damper holding part of the damper holding part 43 are made into a V shape. Ru. With this configuration, the damper 37, the housing 42, and the damper can be connected to each other similarly to the second embodiment. A gap is created between each of the presser holders 43, and the contact area between them can be reduced. Therefore, the amount of displacement of guide rails 26a, 26b can be larger, and therefore A higher vibration damping effect can be obtained.

[0017] FIGS. 8A and 8B show the main parts of a fifth embodiment of this invention. This example In the third embodiment, each guide is moved without passing the damper through the guide rail 26a (26b). A pair of dampers 37a and 37b having V-shaped grooves are used for the drain rail, and one damper is Glue the damper 37a to the housing 42 and the other damper 37b to the damper holder 43. Then, press the damper holder 43 so that the guide rail 26a (26b) is sandwiched between the pair of dampers 37a, 37b. It is designed to be fixed to the base. According to this configuration, there is no need to pass the damper through the guide rails 26a, 26b. Workability during guide rail installation can be improved.

[0018] FIG. 9 shows a sixth embodiment of this invention. This example uses an integrated optical system. This is applied to the formula, and the pair of guide rails 26a and 26b are pushed at two locations each. The rail abutting parts 33a, 34a and 33b, 34b are connected by the rails 35a, 36a and 35b, 36b. The semiconductor laser is fixed to the base through the holder 35a, 36a and 35b, 36b. , guides the integrated optical section 45 that holds all the optical systems including the photodetector, objective lens, etc. While moving it along the rails 26a, 26b, the guide on the presser foot 36a, 36b side The end portions of the rail are extended, and dampers 37 are installed at these ends in the same manner as in the third and fourth embodiments. These dampers 37 are fitted into the housing 46 provided on the base, and the dampers are pressed. By pressing and holding the guide rails 26a, 26b with the clamps 47, the guide rails 26a, 26b are separated from the pressers 36a, 36b. The separated end is fixed to the base via the damper 37. Other details are the same as those in the embodiment described above. One symbol indicates something that has the same effect. Therefore, in this embodiment as well, the guide rail 26 is a, 26b can be effectively suppressed, and is movably supported by the guide rails 26a, 26b. It is possible to effectively reduce the vibration of the integrated optical section 45, which improves servo characteristics and information signals. It is possible to effectively improve the signal-to-noise ratio, etc. of the signal.

[0019] Note that this invention is not limited to the above-mentioned embodiments, and can be modified in many ways. or can be changed. For example, the damper mounting structure shown in Figure 7 is shown in Figure 9. The mounting of the damper shown in FIGS. 8A and B can also be applied to the embodiment shown. The structure can also be applied to each of the embodiments shown in FIGS. 2 and 9. In addition , when applying the damper mounting structure of FIGS. 8A and 8B to the embodiment of FIG. A damper is attached to the housing 38 provided in the fixed optical part, and the other damper is attached to the cover 22. All you have to do is glue it. In addition, in the embodiment shown in Fig. 2, a guide is attached to the fixed optical part fixed to the base. One end of the rail is fixed via a damper, but the side opposite to the fixed optical part Extend the ends of the It may also be fixed to the base. Furthermore, in each of the above-mentioned embodiments, the guide rail is separated from one rail holder. The end of the rail was fixed to the base via a damper, but each rail pusher Fix both ends of the guide rail separated from the support to the base via dampers in the same way. You may also do so. Furthermore, in the above embodiment, a damper made of rubber material was used as the elastic means. , Construct elastic means using viscous pressure of oil, friction of solids, electromagnetic force, etc. You can also do that. Furthermore, this invention is not limited to information recording/reproducing devices for magneto-optical disks. It can also be effectively applied to information recording/reproducing devices such as optical discs and optical cards. Ru.

[0020]

[Effect of the idea]

As described above, according to this invention, the first and second fixing parts that fix the guide rail are The guide rail is spaced apart from the first and/or second fixing part in an area that does not include the space between the guide rails. Since the guide rail is fixed to the base via elastic means, the resonance of the guide rail is reduced. It can be effectively suppressed with a high vibration damping effect. Therefore, move to the guide rail It can effectively reduce the vibration of the supported optical system, and is especially suitable for separate optical system systems. This can effectively reduce the optical axis misalignment between the fixed optical part and the movable optical part, so the servo Characteristics, S/N of information signals, etc. can be effectively improved.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the principle of this invention.

FIG. 2 is a diagram showing a first embodiment of the invention.

FIG. 3 is a detailed view of a portion of FIG. 2;

FIG. 4 is a diagram showing main parts of a second embodiment of the invention.

FIG. 5 is a diagram showing a third embodiment of the invention.

FIG. 6 is a detailed view of a portion of FIG. 5;

FIG. 7 is a diagram showing main parts of a fourth embodiment of the invention.

FIG. 8 is a diagram showing the main part of the fifth embodiment of this invention; FIG.
A is a perspective view, and FIG. 8B is a sectional view.

FIG. 9 is a diagram showing a sixth embodiment of the invention.

[Explanation of symbols]

1 Guide rail 2a,2b presser 3 base 4 Elastic means 11 Fixed optics 12 Semiconductor laser 13 Collimator lens 14a,14b Beam shaping lens 15 Prism 16 beam splitter 17 Condensing lens 18 1/2 wave plate 19 Polarizing beam splitter 20,21 Photodetector 22 Cover 25 Movable optical section 26a,26b Guide rail 27 Objective lens 28a,28b coil 29a,29b York 30a,30b Permanent magnet 33a,33b,34a,34b Rail contact part 35a,35b,36a,36b presser 37,37a,37b damper 38 Housing 41 spindle motor 42 Housing 43 Damper holder 44 Beam shaping prism 45 Integrated optical section 46 Housing 47 Damper holder

Claims (1)

[Scope of utility model registration request] 1. A rod-shaped guide rail that is arranged to extend in a direction parallel to the recording medium and substantially orthogonal to the information track, and that is fixed to a base by a first fixed part and a second fixed part that are spaced apart. In the information recording/reproducing apparatus, at least a part of the optical system for recording and/or reproducing information is moved back and forth along the first fixed part and the second fixed part. An area that does not include
An information recording/reproducing apparatus characterized in that the guide rail is fixed to the base via elastic means at a position spaced apart from the first fixing part and/or the second fixing part.