JPH0482026A - Optical head device - Google Patents

Abstract

PURPOSE:To prevent electrostatic destruction of a semiconductor laser element (LD) at the time of connecting a head part to the circuit board of a driving device by opening a switch part by a pin provided on the circuit board at the time of connection of each connector. CONSTITUTION:When a head part main body 2 is connected to an LD driving circuit 6, a pin 10 close to a male connector 9 pushes up a contact part 8a of a switch part 8 in a female connector 7 with switch. Therefore, two input/ output electric wires 3, namely, the anode and the cathode of an LD 1 short- circuited by the switch part 8 are opened by electric connection between the head part main body 2 and a circuit board 4 to release the protection of electrostatic destruction of the LD 1. Thus, electrostatic pulses are prevented from penetrating the part between the anode and the cathode at the time connection between the head part main body 2 and the circuit board 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical head device that prevents a semiconductor laser element provided in a head main body from being damaged by electrostatic discharge.

[Conventional technology]

FIG. 7 is a perspective view showing a conventional optical head device,
In the figure, 1 is a semiconductor laser element (hereinafter referred to as LD), 2 is a head main body which is the main body of an optical head device in which an LDI is mounted, and 3 is a head main body 2 and a circuit board 4 of its active device. An input/output electric wire for connection, which is provided, for example, on a flexible sheet. Reference numeral 5 denotes an LDI short-circuit connector used to prevent electrostatic damage in the LDI, and specifically, as shown in FIG. 8, a short-circuit pin 5a.

5b are connected by a lead wire 5c.

Next, the operation will be explained.

The LDI is mounted on the head main body 2 as described above, and usually both ends of the LDI, that is, the anode and the cathode, are connected to the input/output wire 3.

Now, if both ends of the input/output wire 3 connected to the LDI are opened as shown in Figure 8, static electricity will enter from both ends, and the LD-1 will be damaged by static electricity. . For this reason, conventionally, the input/output wire 3 is connected to the LDID connector 5, and the LDI is short-circuited by the lead wire 5c connected to the pins 5a and 5b.
This prevents static electricity from flowing into the LDl and prevents electrostatic damage.

[Problem to be solved by the invention]

Since the conventional optical head device is configured as described above, when connecting the head main body 2 to the circuit board 4 of the active device, the connector 5 is disconnected from the input/output wire 3 at least once. Therefore, both ends of the LDI will be open, and there is a possibility that the LDI will be damaged by electrostatic discharge. However, there were problems such as difficulty in assembling and poor assembly efficiency.

This invention was made to solve the above-mentioned problems.It is possible to reliably protect the LD from electrostatic damage without attaching a connector or earth band used only for LD short-circuiting, and to protect the LD from electrostatic damage. An object of the present invention is to obtain an optical head device that can easily release the protection of the optical head.

[Means to solve the problem]

The optical head device according to the present invention prevents electrostatic damage to the semiconductor laser element by attaching a connector that shorts between the anode and cathode of the semiconductor laser element to the head main body having the semiconductor laser element. In the optical head device, a switch section provided on the connector so as to short-circuit between the anode and the cathode;
and another connector for connecting the main body to a circuit board having an active circuit of the semiconductor laser element through the connector, and a pin provided on the circuit board allows the switch section to be connected when each of the connectors is connected. It was designed to open.

[Effect]

The optical head device according to the present invention has a L
When protecting D, the LD is kept short-circuited by the switch part of the connector, and when the head main body is connected to the circuit board, the switch part is operated by the pin on the circuit board side, and the LD protection can be released at the same time. make it happen.

[Embodiments of the invention]

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

In Fig. 1, 1 is the LD, 2 is the head main body, 3 is the input/output wire, and 6 is the LD parking assistance circuit 7 that drives the LDI, which is a female connector with a switch as a connector connected to the input/output power g3. The switch part 8 is made of an elastic conductive plate, and one end is fixed to the input/output wire 3 end on the anode side so as to short-circuit the cathode and anode of the LDI, and the other end is fixed to the input/output wire 3 on the cathode side. Make sure to touch the 3 ends lightly.
It is installed as shown in Figure 2. Further, a contact 8a is provided protruding from the end of the switch portion 8. Reference numeral 9 denotes a male connector which is another connector that fits into the female connector 7 with a switch and is attached to the circuit board 4. Reference numeral 10 indicates a pin attached to the circuit board 4 in the vicinity of the male connector 9.

Next, the operation will be explained.

First, in the state shown in FIG. 1, the anode and cathode of the LDI mounted on the main body 2 are short-circuited by the switch part 8 of the female connector with switch 7 via the input/output wire 3. Therefore, at this time, electrostatic damage to the LDI is prevented.

On the other hand, when the female connector 7 with a switch is connected to the male connector 9 attached to the circuit board 4 as shown in FIG. A pin 10 close to the connector 9 pushes up the contact 8a of the switch section 8 in the female connector with switch 7. Therefore, the two input/output wires 3 that were short-circuited by the switch section 8, that is, the LDI
The anode and cathode of are opened for the first time when the head main body 2 and the circuit board 4 are electrically connected, and the electrostatic charge of the LDl is
Destruction protection is removed. That is, it is possible to prevent electrostatic pulses from entering between the anode and cathode during the connection work between the head main body 2 and the circuit board 4.

FIG. 4 shows another embodiment of the invention. To explain this, 1 is an LD, 2 is a head main body, 3 is an input/output wire, 4 is a circuit board, 11 is a male connector with a switch and has a hole 12 connected to the input/output wire 3, and 13 is a switch. A switch part 14 of the male connector 11 with a switch is a female connector with pins which is fitted into the male connector 11 with a switch and attached to the circuit board 4, and 15 is a pin attached to the female connector 14 with pins.

Next, the operation will be explained.

The switch part 13 of the male connector with switch 11 short-circuits the anode and cathode of the LDI, and on the other hand, similarly to the first embodiment, when connecting the head main body 2 to the circuit board 4, the LDI is electrostatically connected. Protect from destruction. That is, as shown in FIG. 5, when transporting the head main body 2,
The short circuit between the anode and cathode of the LDI by the switch section 13 protects the LDI from electrostatic damage.

On the other hand, in order to connect the head main body 2 to the circuit board 4,
The male connector 11 with a switch is connected to the female connector 14 with a pin,
When attached as shown in FIG. 6, the pins 15 of the female connector with pins 14 push up the switch portion 13 through the holes 12 of the male connector with a switch 11 as shown in the same figure. Therefore, the switch unit 13 has two input/output power supplies [3
, that is, the anode and cathode of the LDI are opened. Therefore, since the anode and cathode are opened simultaneously or simultaneously when the head main body 2 and the circuit board 4 are connected, the earth band prevents electrostatic damage to the LD1, that is, damage caused by static electricity received from the human body. Even without wearing it,
It can definitely be prevented.

〔Effect of the invention〕

As described above, according to the present invention, the main body is connected to the circuit board having the driving circuit of the semiconductor laser element through the switch section provided on the connector so as to short-circuit between the anode and the cathode, and the connector. The pins provided on the circuit board are equipped with other connectors to
Since the switch section is configured to open when each of the connectors is connected, it is possible to prevent electrostatic damage to the LD when the head section is connected to the circuit board of the drive device. It is possible to eliminate the troublesome work of removing the connector used only for shorting the LD and canceling the electrostatic protection of the LD, and the overall efficiency of assembling the optical head device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an optical head device according to an embodiment of the present invention, FIG. 2 is a front view showing a state in which the female connector with switch and the male connector in FIG. 1 are separated, and FIG. 1 is a front view showing the fitted state of the female connector with switch and fiber connector in FIG. 1, FIG. 4 is a perspective view 1 showing another embodiment of the optical head device, and FIG. 5 is the female connector with switch in FIG. 6 is a front view showing the disconnected state of the connector and the male connector with pins; FIG. 6 is a front view showing the fitted state of the female connector with switch and the male connector with pins in FIG. 4; FIG.
8 is a perspective view showing a conventional optical head device, and FIG. 8 is a plan view showing the correspondence between the LD short-circuiting connector and the input/output wires in FIG. 7. 1 is a semiconductor laser element (LD), 2 is a head main body, 4
is a circuit board, 6 is a swing circuit, 7 is a connector, 8 is a switch section, 9 is another connector, and 10 is a pin. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In an optical head device that prevents electrostatic damage to a semiconductor laser element by connecting a connector that shorts between an anode and a cathode of the semiconductor laser element to a head main body having a semiconductor laser element, the anode, a switch section provided on the connector to short-circuit the cathodes; another connector that connects the head main body to a circuit board having a drive circuit for the semiconductor laser element via the connector; and the circuit board. An optical head device characterized by comprising a pin provided on a substrate or the other connector described above to open the switch portion when each of the connectors is connected.