JPH04332992A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To easily prevent the jumping of noise generated from the electric circuit of a recording and reproducing device which records and reproduce information on and from a discoid recording medium into a recording and reproduced signal circuit. CONSTITUTION:The drive circuit of a rotationally driving means which rotationally drives a discoid recording medium and a parts mounting circuit board forming an electric circuit except the recording and reproduced signal circuit of a head driving means for driving a head are arranged between a slider and chassis and, at the same time, the slider and chassis are formed of metallic materials.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording/reproducing apparatus for recording and reproducing information on a recording medium.

0002

[Prior Art] An example of a conventional recording/reproducing device of this type is
The configuration of the recording and reproducing apparatus is shown in a plan view in FIG. 3 and in a side view in FIG. 4.

In FIGS. 3 and 4, 1 is a chassis of a recording/reproducing device, 2 is a head for recording or reproducing information on a disk-shaped recording medium (hereinafter referred to as a medium), and 3 is a device on which the head 2 is mounted. a carriage movably guided in the radial direction of the medium; 4 a stepping motor constituting head driving means A for moving the carriage 3 over the entire recording area; 5 rotationally driving the medium at a predetermined rotational speed; 6 is a drive coil for the spindle motor 5; 7 is a slider (not shown) for moving a medium from a non-recording/reproducing position to a recording/reproducing position or vice versa; 8 is the spindle; A circuit board on which drive ICs (not shown) for driving the motor 5 and the stepping motor 4 are mounted and peripheral circuits formed thereon; 9 is a wire harness connecting the drive coil 6 of the spindle motor 5 and the circuit board 8; 10 indicates the stepping motor 4 and the circuit board 8.
A wire harness 11 connects the two, and 11 is a shield plate that shields noise.

In the above configuration, the slider 7 and the shield plate 11 prevent noise generated from the drive coil 6, drive IC, etc. from entering the recording/reproducing signal circuit (not shown).

[0005]

However, in the conventional example, the circuit board 8 on which the driving ICs for the stepping motor 4 and the spindle motor 5 are mounted is disposed outside the chassis 1 of the recording/reproducing apparatus. In order to
For example, when considering installing a recording/reproducing device in a device having an analog signal processing circuit such as an electronic camera, the shield plate 11 is installed to prevent noise generated from the drive IC from entering the signal processing circuit. There was a problem that needed to be established.

The present invention was made to solve the problems of the conventional example as described above, and provides a recording/reproducing device that can easily prevent noise from entering a signal processing circuit without providing a special shield plate. The purpose is to provide

[0007]

[Means for Solving the Problems] Therefore, a recording and reproducing apparatus according to the present invention includes: a head for recording and reproducing information; a rotational drive means for driving a disc-shaped recording medium at a predetermined number of rotations; A recording and reproducing device in which a head driving means for moving the head with respect to a recording and reproducing area of a recording medium and a slider for switching and moving the recording medium between a non-recording and reproducing position and a recording and reproducing position are disposed on a chassis, A circuit board on which electric circuits for the rotational driving means and head driving means except for the recording/reproducing signal circuit are formed and mounting components is mounted is inserted between the slider and the chassis, and the slider is made of a metal material. Furthermore, the chassis is made of a metal material to achieve the above object.

[0008]

[Operation] The recording and reproducing apparatus according to the present invention configured as described above includes an electric circuit including a control circuit for a rotational driving means for rotationally driving a recording medium, excluding a recording and reproducing signal circuit, and a control circuit for a head driving means. A circuit board on which a circuit board is formed and mounting components is mounted is inserted between the slider and the chassis, and the slider and chassis are made of a metal material, so that the slider and chassis also serve as a noise shield plate. This prevents noise generated from components mounted on the circuit board from entering the recording/reproducing signal circuit, thereby eliminating the need to provide a shield plate for noise shielding.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (Structure) FIG. 1 is a plan view of the structure of a recording and reproducing apparatus showing one embodiment of the present invention, and FIG. 2 is a sectional view of the main part of the recording and reproducing apparatus of the above embodiment. Note that the same or equivalent parts as in the conventional example are represented by the same reference numerals.

In FIGS. 1 and 2, 12 is a screw having a desired spiral shape and cut into the output shaft of the stepping motor; 13 is fixed to the carriage 3 at one end and engaged with the screw 12 at the other end; It is an elastic body that has a pin 14 and biases the pin 14 against the screw 12. Further, the spindle motor 5 includes a recording medium chucking section 5a, a torque generating section 5b, and a bearing section 5c. 8A is a circuit board (hereinafter referred to as the board) whose outline is shown by broken lines on which the drive coil 6 of the spindle motor 5, the rotation drive IC 15, and its peripheral circuits, and the drive IC 16 of the stepping motor 4 and its peripheral circuits are mounted.
, 7 are guided by pins 17 planted in the chassis 1,
A recording medium (not shown) is moved from a non-recording/reproducing position to a recording/reproducing position, or vice versa, by a cam portion 7a that is movably arranged in the direction F in FIG. 1 and configured at both ends (only one side is shown). This is a slider for switching. The stepping motor 4, the substrate 8A, the screw 12, the elastic body 13, the pin 14 and the drive IC 16 constitute a head drive means A, and the spindle motor 5, the substrate 8A and the drive IC 15 constitute a rotation drive means B. . Furthermore, chassis 1
Both of the slider 7 and the slider 7 are made of a metal material such as an iron plate.

(Operation) The operation will be explained based on the above configuration. For example, assuming that this recording/reproducing device is installed in an electronic camera, the coils of the stepping motor 4 and spindle motor 5, the drive ICs 15 and 16
Since the board 8A is inserted between the chassis 1 and the slider 7, which are made of a metal material, the switching noise generated by the switch from entering the analog signal processing circuit of the electronic camera (not shown) is shielded from both sides. The shield plate is then reduced to unnecessary noise levels. Therefore,
Since there is no need to provide a shield plate, the recording/reproducing device can be made thinner and the cost can be reduced.

[0012] In the above embodiment, a spindle motor and a stepping motor were used as examples of the rotary drive means and head drive means mounted on the recording/reproducing apparatus, but the invention is not limited to these, and electromagnets and the like may also be used. In a device that uses this to drive a head, a switching transistor may be mounted on a circuit board.

Furthermore, it goes without saying that the present invention can be applied to anything that uses magnetic disks, optical disks, magneto-optical disks, etc. as recording media.

Furthermore, in the above embodiment, the driving circuits for driving means for both the spindle motor and the stepping motor are inserted between the chassis and the slider, but it is necessary to drive the stepping motor during recording and reproduction. Since there is little noise, simply inserting only the spindle motor drive circuit between the chassis and the slider has a noise shielding effect, so inserting only the spindle motor drive circuit board between the chassis and the slider. You may. Further, in the above embodiment, the driving circuit is formed on the substrate, but the control circuit may also be included.

[0015]

As explained above, according to the present invention, a wiring board on which mounted components such as a control circuit for a stepping motor and a spindle motor drive means excluding a recording/reproducing signal circuit is formed of a metal material. Since the structure is such that the motors are inserted between the chassis and the slider, the switching noise generated when the two motors are driven can be shielded and reduced. In addition to preventing noise from entering, it is possible to eliminate the shield plate for noise shielding that is conventionally required. This makes it possible to make the recording/reproducing device thinner and to reduce the cost.

[Brief explanation of drawings]

FIG. 1 is a configuration plan view of a recording/reproducing apparatus according to an embodiment.

FIG. 2 is a cross-sectional view of the main part of the recording/reproducing apparatus of the above embodiment.

FIG. 3 is a configuration plan view of a conventional recording/reproducing device.

FIG. 4 is a side view showing the configuration of main parts of the conventional recording/reproducing device.

[Explanation of symbols]

1 Chassis 7 Slider 8A　　　Wiring board A Head driving means B Rotation drive means Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A head for recording and reproducing information, a rotational drive means for driving a disc-shaped recording medium at a predetermined number of rotations, and a head drive for moving the head with respect to a recording/reproducing area of the recording medium. and a slider for switching and moving the recording medium between a non-recording and reproducing position and a recording and reproducing position, the recording and reproducing apparatus is provided in a chassis, wherein the rotation driving means and the head driving means, excluding the recording and reproducing signal circuit, are electrically connected. A recording/reproducing apparatus characterized in that a circuit board on which a circuit is formed and mounted components is inserted and disposed between the slider and the chassis. 2. The recording/reproducing apparatus according to claim 1, wherein the slider is formed of a metal material. 3. The recording/reproducing apparatus according to claim 1, wherein the chassis is formed of a metal material.