JPH03203044A - Optical disk device - Google Patents

Abstract

PURPOSE:To strengthen the grounding capacity, the shieldability, and the fixing capacity of a high frequency oscillator, and to make a device small-size and of high quality by constituting a part of the outer packaging member of the high frequency oscillator for laser modulation by using the conductive packaging member of a laser or its holding member. CONSTITUTION:The circuit board 10 of the high frequency oscillator is housed in a shield case constituted by combining a base stand 9-b of the laser 9 and an outer case 12 formed of metallic material. A through type capacitor 11 to pass through the inside of the shield case as a terminal for an input and output signals is connected to the circuit board 10 and an external circuit. A laser terminal 9-c is soldered to the circuit board 10, and the board 10 is connected to the base stand 9-b, and its grounded. Thus, since the base stand 9-b forms a part of the shield case, the fixing capacity to a shield of the high frequency oscillator is ensured, and screws for fixing the high frequency oscillator become unnecessary, and the device can be made small-size and of high quality.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical disc device that uses a laser beam to record and reproduce information signals on a rotationally driven information recording disc (hereinafter referred to as a disc). be.

2. Description of the Related Art In recent years, optical disk devices have been attracting attention as next-generation storage devices as information becomes larger and more diverse.

An example of the above-mentioned conventional optical disc device will be described below with reference to the drawings.

FIG. 3 is a cross-sectional view showing the laser mounting portion of the head of a conventional optical disc device. The laser 1 includes a light emitting element 1-a, a base 1-b, a terminal 1-c, and the like.

A laser base (1-b) is press-fitted into the laser holder 2. The collimating lens 3 is housed in an optical block 4. The high frequency oscillator 5 has a circuit board 6-c housed in a shield cane consisting of an inner case 5-a and an outer case 5-b. A feedthrough capacitor 11 that passes through the shield cable as an input/output signal terminal is connected to the circuit board (
5-c) and an external circuit (not shown). The terminal 1-C of the laser is soldered to the circuit board 6-c, and the circuit board 5-c is grounded to the inner case 5-a by means such as soldering. The high frequency oscillator 5 is fixed to the laser holder 2 with screws 6, and further to the laser holder 2 and further to the optical block 4 with screws 7.

The operation of the optical disc device configured as described above will be explained. The laser 1 is driven by an input signal from the feedthrough capacitor 6-d via the circuit board 5-a of the high-frequency oscillator 5, and emits light.

The laser beam 8 is converted into parallel light by the collimating lens 3, passes through the optical block, and is focused on the disk to record and reproduce information signals. Normally, a high-output laser is used in an optical disk device for recording and re-recording, as it requires high power (for example, 10 mW) during recording. Since it is driven near the threshold value (limiting current at which light emission begins), optical noise increases and the S/N ratio of the reproduced signal decreases significantly. The high-frequency oscillator 5 is designed to improve this problem by superimposing a high-frequency signal (for example, 700 MHz) on the laser drive signal to modulate the laser light when driving the laser with reproduction power. This reduces the influence of incoming light, reduces optical noise, and improves the S/N ratio of reproduced signals.

Problems to be Solved by the Invention However, the above configuration has the following problems.

(1) If the degree of adhesion between the high frequency oscillator 5 and the laser holder 2 is low, the grounding force will decrease and radio wave leakage from the high frequency oscillator (
(unnecessary radiation) is large (decreased shielding property) and may cause radio wave interference to other equipment. In that case, the optical noise reduction effect of the laser beam decreases, and the SIN ratio of the reproduced signal decreases.

(2) Since the screws 6 are used to fix the high frequency oscillator 6, the internal area of the high frequency oscillator increases, leading to an increase in the size of the device. High frequency oscillation circuits and lasers may be destroyed when tightening screws on the casing.

(3) Although it can be made smaller without using screws, radio wave leakage will further increase. Furthermore, the fixing strength of the high frequency oscillator is significantly reduced, the load on the laser terminal 1-c increases, and the laser is more likely to be destroyed.

In response to the above-mentioned problems, the present invention provides an optical DENUK device that is small in size and capable of high-quality signal reproduction with little leakage of radio waves from a high-frequency oscillator.

Means for Solving the Problems In order to solve the above-mentioned problems, an optical disk device of the present invention includes a laser exterior member or a holding member that holds the exterior member forming a part of the exterior member of a high frequency oscillator for laser modulation. It has a configuration.

Effects of the present invention With the above-described configuration, the grounding force, shielding ability, and fixing force of the high-frequency oscillator are enhanced without using fixing screws, so that a compact and high-quality optical disk device can be realized. Become.

Embodiment Hereinafter, an optical disc device according to a first embodiment of the present invention will be described with reference to the drawings. Hereinafter, parts with the same functions as those described above are given the same reference numerals and explanations will be omitted.

FIG. 1 shows the laser mounting section of the head of an optical disk device in the first embodiment of the present invention, in which the laser 9 consists of a light emitting element 9-a, a base 9-b, a terminal 9-C, etc. The circuit board 10 of the high frequency oscillator is housed in a shield case constituted by a laser base 9-b and an outer case 12. A feedthrough capacitor 11 that passes through the shield case as an input/output signal terminal connects the circuit board 10 and the external circuit (
(not shown). The terminal 9-c of the laser is soldered to the circuit board 10, and the circuit board 1o is grounded to the base 9-b of the laser by a method such as soldering. The base 9-b and outer case 12 of the laser are made of metal materials such as iron, copper, and aluminum, and if necessary for soldering for grounding, their surfaces may be plated with Cu, Ni, Sn, etc. The two are combined to form a shield case. These may be molded products coated with metal as long as the shielding effect is satisfied. Since the base 9-b is conductive, a through hole is provided in the portion through which the laser terminal 9-C passes.

As described above, by forming the laser base 9-b as a part of the shielding case of the high-frequency oscillator, 1. the shielding and fixing force of the high-frequency oscillator are guaranteed, and the system eliminates the need for screws to fix the high-frequency oscillator. Miniaturization becomes possible.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows the laser mounting section of the head of the optical disk device according to the second embodiment of the present invention, in which the circuit board 10 of the high frequency oscillator is placed in a shield case with a groove bottom formed by the laser holder 2 and the outer case 712. It is stored. Terminals 1-c of the laser are soldered to a circuit board 10, and the circuit board 10 is grounded to the laser holder 2 by a method such as soldering.

The laser holder 2 and the outer case 12 are made of metal materials such as iron, copper, and aluminum, and if necessary for soldering, the surfaces are plated with Cu, Nt, Sn, etc., and the two are assembled together. Forms a shield case.

A molded product with metal plating may be used as long as the shielding effect is satisfied.

As described above, by forming a part of the shield case of the high frequency oscillator with the laser holder 2, the shielding and fixing force of the high frequency oscillator are guaranteed, and furthermore, the screws for fixing the high frequency oscillator are not required, making it possible to downsize the high frequency oscillator. Become. Nafu・, 2nd
This embodiment has the advantage that a conventional laser can be used as is.

Effects of the Invention As is clear from the description of the embodiments above, the present invention provides a laser exterior member used for recording and reproducing information signals, or a holding member for holding the exterior member, which is conductive and is used for modulating laser light. By forming part of the exterior member of the high-frequency oscillator, it is possible to realize a small, high-quality optical disc device with little radio wave leakage and high mechanical strength.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the head portion of an optical disc device according to the first embodiment of the present invention, FIG. 2 is a sectional view showing the head portion of the optical disc device according to the second embodiment of the present invention, and FIG. 1 is a sectional view showing an example of a head section of a conventional optical disc device. 1.9... Laser, 2... Laser holder, 9-b... Laser base, 1o... High frequency oscillation circuit board, 12...・Outer case.

Claims (1)

[Claims] An optical disc device in which an exterior member of a laser used for recording and reproducing information signals or a holding member that holds the exterior member is conductive and forms a part of the exterior member of a high frequency oscillator for modulating laser light.