JPH05128830A - On-vehicle equipment - Google Patents

Abstract

PURPOSE:To exhibit a stable elastically supporting function even when only one elastic supporting member which exhibits a vibration controlling force both in vertical and horizontal directions such as an oil dumper is provided between a casing and a drive chassis. CONSTITUTION:A chassis 17 provided with a pick-up 20 for reproducing information recorded on a disk D is stored in a casing 16 attached to a car body. In this on-vehicle equipment, an oil dumper 29 is interposed between the chassis 17 and the casing 16 in the almost vertically lower direction of the centroid 25 of the chassis 17, the damper 29 exhibits an elastic force in the vertical and horizontal directions and an air dumper 18 exhibiting an elastic force mainly in a vertical direction is provided on the other position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted device for reproducing information from a recording medium such as an optical disk, a magneto-optical disk, a magnetic tape or the like.

[0002]

2. Description of the Related Art FIG. 5 shows a schematic configuration of a vehicle-mounted disc player as an example of vehicle-mounted equipment. In the vehicle-mounted disc player 1 shown in the figure, a drive chassis 3 is housed in a housing 2 attached to the vehicle body of an automobile, and a turntable 8 on which a disc CD is installed in the drive chassis 3 and a guide member. An optical pickup 5 is provided which moves along 6, 6 and performs a reproducing operation for the disc CD. In the drive chassis 3, the oil dampers 7 provided at four locations prevent the vibration transmitted from the vehicle body from being transmitted to the servo system (not shown) in the optical pickup 5 via the casing 2. Bottom 2a
Supported above. The oil damper 7 of this type has a highly viscous fluid such as oil enclosed in a bag made of an elastic material such as rubber. Therefore, the vibration damping is performed in both the vertical direction and the horizontal direction of the drive chassis 3. It is capable of exerting its power.

[0003]

However, when the drive chassis 3 is supported by the oil damper 7,
Although it is necessary to provide the oil damper 7 at least at about four places, the unit price of the oil damper 7 is high, and therefore if the oil damper 7 is provided at four places, the cost of the entire apparatus becomes high.
An air damper is a relatively cheap damper. If an air damper is used instead of the oil damper 7, the cost of the entire device can be reduced.

FIG. 6 is a sectional view showing the structure of an air damper 11 applicable to this type of device. The air damper 11 of this type is provided with a spring 9 for supporting a load in the vertical direction (vertical direction in the drawing), and is arranged in the spring 9 so that the internal air is allowed to flow in and out through an orifice 10a formed in the upper portion. Similarly, a rubber damping member 10 for damping vertical vibration is provided.

However, the air damper 11 having such a structure mainly exerts the vibration damping force in the vertical direction and cannot exert the elastic force in the horizontal direction, and the vibration damping action in the same direction. It has become impossible to demonstrate. However, in the vehicle-mounted device as shown in FIG. 5, since the vibration of the vehicle body is applied to the housing 2 from all three-dimensional directions,
When the drive chassis 3 is supported only by the air damper 11, external vibration in the horizontal direction is easily transmitted to the drive chassis 3, which adversely affects the tracking servo operation in the optical pickup 5, for example.

The present invention solves the above-mentioned problems of the prior art, and by virtue of the combination of inexpensive elastic support members, it is possible to efficiently exert the damping force to the drive chassis when vibrations in each direction act. It is an object of the present invention to provide an in-vehicle device that

[0007]

In order to achieve the above object, the structure of the present invention is such that a drive chassis equipped with a recording medium installation portion and a pickup for reproducing information from the recording medium is mounted on a vehicle body. In an in-vehicle device housed in a housing to be attached, the drive chassis and the position of the center of gravity of the weight of the entire members mounted on the drive chassis or vertically below the center of gravity and between the drive chassis and the housing are An elastic support member capable of exerting an elastic force with respect to vertical and horizontal movements of the drive chassis is provided, and the other part of the drive chassis has an elastic support member capable of exerting an elastic force mainly in the vertical direction with respect to the housing. Are supported by.

[0008]

The operation of the present invention having the above means will be described. The vibration applied to the housing is absorbed or suppressed by an elastic support member that supports the position of the center of gravity of the drive chassis or the vicinity thereof and other elastic support members, and is transmitted to the drive chassis. The horizontal component of the vibration is mainly absorbed or suppressed by the elastic support member provided at or near the center of gravity, and the vertical component of the vibration is generated by the elastic support member and other elastic support members. Absorbed or suppressed. Since the elastic member having the function of absorbing or suppressing the horizontal component of the vibration is provided at or near the center of gravity of the drive chassis, the vibration of the horizontal component applied to the drive chassis can be efficiently suppressed by this elastic support member. Therefore, for example, the moment due to the horizontal vibration component acting around the center of gravity of the drive chassis can be prevented, and the effective vibration damping function can be exhibited.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing the structure of a mechanical system of a vehicle-mounted disc player, and FIG. 2 is a partial cross-sectional view showing FIG. 1 in the direction of arrows II-II. In the disc player 15 shown in the figure, a drive chassis 17 is mounted inside a housing 16 mounted inside a vehicle body, for example, a dashboard, via three air dampers 18 and a single oil damper 29.

In the drive chassis 17, a turntable 19 for rotating the optical disc D is arranged on the central upper surface, and a reproducing section for reading out the data recorded on the optical disc D or the like mounted on the turntable 19 is arranged on the side of the turntable 19. The optical pickup 20 is disposed as a. The optical pickup 20 is arranged between the guide rails 21 and 21 arranged parallel to the radial direction around the turntable 19 and is supported so as to be able to reciprocate within a certain range. Further, at the center of the upper surface of the optical pickup 20, an objective lens 20a for transmitting and receiving laser light to and from the optical disc D mounted on the turntable 19 is provided. Further, a rack member 22 is fixed to one end of the optical pickup 20, and the driving force of the motor 24 is transmitted via a gear mechanism portion 23 arranged adjacent to the rack member 22.

In FIG. 1, the position of the center of gravity of the entire weight of the drive chassis 17 and the members mounted on the drive chassis 17 is indicated by reference numeral 25. In the present embodiment, this center of gravity position 25
An oil damper 29 is provided vertically below. As shown in detail in FIG. 2, the oil damper 29 has a bag-shaped rubber member having an upper end attached to the bottom of the drive chassis 17 via a screw 29b and a lower end attached to the bottom surface 16a of the housing 16. The inside is filled with a highly viscous fluid such as oil 29a. A resistance member 29c is formed on the inner side of the upper portion of the bag-shaped rubber. The oil damper 29 expands and contracts in the vertical direction to generate a fluid resistance due to the viscosity of the highly viscous oil 29a therein, thereby exerting a damping force against the vibration in the vertical direction and against the vibration acting in the horizontal direction. As for the cross-shaped resistance member 29c, the oil 29
The fluid resistance due to the movement in a and the elastic resistance when the upper surface of the bag-shaped rubber is deformed in the horizontal direction are generated, and the vibration damping function in the horizontal direction can be exhibited.

2 is a motor for rotating the turntable 19, 27 is a clamper for sandwiching the optical disk D mounted on the turntable 19, and 28 is a clamp for supporting the clamper 27. It is an arm. Further, leg portions 17a to 17c are formed at positions at which the entire circumference of the drive chassis 17 centering around the turntable 19 is divided into approximately three parts, and the leg portions 17a to 17c are formed between the leg portions and the bottom surface 16a of the housing 16. The air dampers 18 are attached to each. The air damper 18 has the same structure as that shown in FIG. 6, and has the orifice 10 formed in the rubber damping member 10.
An elastic force mainly in the vertical direction can be exerted by the resistance generated when the air passes through a. Although the spring 9 is provided on the outer peripheral portion of the damping member 10 in FIG. 6, the spring 9 may be housed inside the bag-shaped damping member. The oil damper 29 is the air damper 1 attached to each of the leg portions 17a to 17c.
They are arranged in a triangle with 8 as the apex.

The operation of the disc player having the above configuration will be described with reference to FIGS. 3 and 4. In addition,
3 and 4 are explanatory views showing the drive chassis 17 and the air damper 18 and the oil damper 29 that support the drive chassis 17 in a simplified manner. First, when the vibration applied to the housing 16 is in the vertical direction as shown in FIG.
And each air damper 18 shares and is damped. On the other hand, when the vibration applied to the housing 16 is horizontal as shown in FIG. 4, the vibration is damped only by the oil damper 29 arranged mainly below the center of gravity.

When the above horizontal vibration is applied, this vibration acts on the center of gravity 25, but since the oil damper 29 and the center of gravity 25 coincide, a rotational moment force about the oil damper 29 acts. Even in such a case, the vibration is damped by the highly viscous oil 29a of the resistance member 29c. Therefore, the drive chassis 17 can stably maintain its posture even when the above-described horizontal vibration is applied. As described above, in this embodiment, the oil damper 29 as an elastic member that exerts elastic force in the horizontal direction and the vertical direction is arranged so as to match the center of gravity 25, so that the drive chassis 17 can be driven by the single oil damper 29. Can be stably supported. Therefore, the oil damper 29 arranged at the center of gravity 25
Other components can be replaced with inexpensive ones, for example, air dampers, which can reduce the manufacturing cost.

The present invention is not limited to the above embodiment, but various modifications can be made within the scope of the gist thereof. In the above embodiment, the disk player using the optical disk as the information recording medium has been described as an example, but a magnetic tape device using a magnetic tape capable of recording analog data or digital data as the information recording medium may be used. The present invention can be applied to not only optical discs but also disc players such as magnetic discs and magneto-optical discs.

In the above embodiment, the air damper is used as an example. However, the oil damper arranged around the oil damper may be one that exerts elastic force only in the vertical direction. For example, a compression coil spring or a rubber member may be used. With such a configuration, the manufacturing cost can be further reduced.
Further, in the above embodiment, the elastic member is arranged on the center of gravity, but the same effect can be obtained even if the elastic member is arranged near the center of gravity.

[0017]

According to the present invention, which has been described in detail above, the drive chassis is located substantially vertically below the center of gravity and between the drive chassis and the casing.
Since an elastic member that exerts elastic force in the vertical direction and the horizontal direction is interposed, and the other part of the drive chassis is supported by the elastic member that exerts the elastic force in the vertical direction between the housing and the chassis, Even if a single oil damper is used, vertical and horizontal vibrations can be effectively suppressed, and the drive chassis can be supported stably, thereby reducing manufacturing costs Equipment can be provided.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a mechanical system of a disc player which is an embodiment of the present invention.

FIG. 2 is an arrow view including a partial cross section taken along the line II-II shown in FIG.

FIG. 3 is an explanatory view showing a drive chassis and an air damper and an oil damper supporting the drive chassis in a simplified manner.

FIG. 4 is an explanatory view showing a drive chassis and an air damper and an oil damper supporting the drive chassis in a simplified manner.

FIG. 5 is a top view showing a schematic configuration of a conventional vehicle-mounted disc player.

FIG. 6 is a schematic sectional view showing the structure of an air damper.

[Explanation of symbols]

 16 Housing 17 Drive Chassis 18 Other Elastic Support Member (Air Damper) 20 Playback Section 25 Center of Gravity 29 Elastic Support Member (Oil Damper) D Information Recording Medium (Optical Disk)

Claims (1)

[Claims] 1. An in-vehicle device in which a drive chassis equipped with a recording medium installation section and a pickup for reproducing information from the recording medium is housed in a housing attached to a vehicle body. Also, an elastic force is exerted against vertical and horizontal movements of the drive chassis between the drive chassis and the chassis vertically below or near the center of gravity of the weight of all the members mounted on the drive chassis. An in-vehicle device characterized in that an elastic supporting member capable of performing elastic force is provided, and the other part of the drive chassis is supported by the elastic supporting member capable of exerting an elastic force mainly in the vertical direction with respect to the housing.