JP2712177B2 - Q switch element - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Q-switch element, and more particularly to an electrode for preventing an electric field from locally concentrating on a part of an electrode of an input transducer and increasing the temperature. The present invention relates to a Q switch element capable of supplying power to the whole. [Prior Art] FIG. 2 shows a side view of a conventional Q switch element. The Q switch element performs impedance matching between a Q switch medium 1 made of quartz glass, LiNbO ₃ crystal, or the like, a piezoelectric body 2 for an input transducer attached to one surface of the Q switch medium 1, and a drive circuit. It comprises a matching circuit 3 and a package 8. The power supply to the Q switch element is performed by conductively connecting the piezoelectric body 2 and the matching circuit 3 with the metal pieces 5. FIG. 3 is an enlarged side view of the power supply section of the Q switch element. Conventionally, a gold piece 5 having an area smaller than that of the electrode portion of the piezoelectric body 2 is conductively connected by surface contact with the electrode portion. For example, the contact area of the gold piece 5 is 3 × 12 mm ^2, which is about 1/3 of the contact area of the electrode area of 5 × 21 mm ² . Further, the edges of the gold pieces 5 were all in contact from the periphery of the electrode. FIG. 4 shows a plan view of the piezoelectric body of the input transducer. A piezoelectric body 2 for an input transducer is attached to one surface of a Q-switch medium 1, and a gold piece is brought into contact with an electrode on the piezoelectric body.
The hatched portions are the contact portions 6 of the gold pieces, and the edge portions 7 are all in contact from the periphery of the electrode. [Problems to be Solved by the Invention] Conventionally, the edge portion 7 of the contact portion 6 of the gold piece tends to concentrate the electric field from the inside, and has been a location where a strong electric field called a singular point is generated. As a result, the temperature becomes high and the joint between the piezoelectric body and the Q-switch medium 1 is melted, and there is a problem that electrical and optical characteristics are impaired. [Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and a conductive connection between an input transducer for driving a Q-switch element and a matching circuit is provided. An object of the present invention is to provide a Q-switch element which is made of a gold piece or a gold-plated metal material having an area larger than that of the electrode, which is in surface contact with the entire surface of the electrode on the piezoelectric body. [Operation] In the present invention, the gold piece acts so as to eliminate the singular point of the contact portion with the piezoelectric body, and can operate the Q switch element for maximum output. That is, the contact structure has no singular point on the piezoelectric body and the concentration of the electric field is very unlikely to occur, so that the effect of the heat generated by the electric field, which increases as the output increases, is suppressed as much as possible. Embodiment FIG. 1 shows an embodiment of the present invention, and shows a plan view of a piezoelectric body of an input transducer. A piezoelectric body 2 for an input transducer is attached to one surface of a Q-switch medium 1, and a gold piece 5 is in surface contact with the whole surface of the electrode on the piezoelectric body 2. The hatched portion is the contact portion 4. The area of the gold piece 5 is at least larger than the area of the piezoelectric body or the electrode portion of the piezoelectric body, and the shape of the gold piece 5 must be always outside the edge of the piezoelectric body. The area of the electrode is 5.5 × 21 mm ² , whereas the area of the gold piece 5 is 9 × 22 mm ^2, which is a structure that completely covers the electrode. Further, a gold-plated metal material can be used in place of the gold piece 5, but a gold piece is preferable in terms of reliability. [Effects of the Invention] The present invention has an excellent effect that it can be used for a long time in a high-output laser device without deteriorating the electrical and optical characteristics of the Q-switch element.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows one embodiment of the present invention and is a plan view of a piezoelectric body of an input transducer. FIGS. 2 to 4 show views of a conventional example, and FIG. FIG. 3 is a side view of a conventional Q switch element, FIG. 3 is an enlarged side view of a power supply section of the Q switch element, and FIG. 4 is a plan view of a piezoelectric body of the input transducer. 1 Q switch medium 2 Piezoelectric body 5 Gold piece 4 Contact part

Claims (1)

(57) [Claims] A gold piece or a gold-plated metal material having an area larger than the electrode, which is in surface contact with the conductive connection between the input transducer driving the Q-switch element and the matching circuit, covering the entire electrode on the piezoelectric body of the input transducer. A Q-switch element.