JPH062822U - Piezoelectric oscillator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a piezoelectric ceramic vibrator having a high bonding strength and having good printing ink coverage. [Structure] A piezoelectric ceramic plate with excitation electrodes formed on the front and back surfaces,
At least two lead terminal plates 21 and 22 which are in contact with the piezoelectric ceramic plate and lead out electrodes to the outside, and a case 1 in which the piezoelectric ceramic plate and the lead terminal plate are integrally housed.
And the tip lead portion of the lead terminal board is connected to the substrate 5
In a piezoelectric ceramic vibrator, which is electrically joined to the upper electrode and one side surface of the case 1 is joined to the substrate 5,
At least the substrate bonding surface 11 of the case 1 was roughened. The printed surface of the case was roughened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piezoelectric ceramic vibrator used as a clock source for electronic devices.

[0002]

[Prior art]

 It is housed in a case made of resin, etc. and has a piezoelectric ceramic resonator with a lead terminal board mounted on a base plate. The lead part is bent, laid on the board, and one side of the case is bonded to the board with an adhesive. There is a structure to do. This is because compared to a method in which only the lead portion is inserted into the hole on the substrate and mounted, the height at the time of mounting the substrate can be made lower and the bonding strength is increased. When the product is completed, markings such as the manufacturer's origin and the product characteristics such as frequency, manufacturing lot number, etc. on the printed surface of the piezoelectric ceramic vibrator are arranged on the printed surface with the parts feeder and aligned with the linear feeder. Then, they were sent to a printing machine, imprinted with immortal ink, UV ink, etc., and stamped one by one.

[0003]

[Problems to be solved by the device]

 However, since the case surface, which corresponds to the bonding surface with the substrate, is made of a resin material, an adhesive that uses a chemical reaction cannot be used to adversely affect the oscillator, such as corrosion of the case surface. However, since the case surface is flat, sufficient bonding strength cannot be obtained, and a method of applying a large amount of adhesive has been adopted to increase the bonding strength. It was For this reason, the conventional resin case structure has a problem that the case peels off due to the weak bonding strength. Further, since the case surface is flat, the marking may not be printed well even if the marking is printed by a printing machine, and the printing yield may decrease and the printing may peel off. When the printed surface is the front surface and the bonding surface is the back surface, the lead part of the lead terminal board is bent, laid on the board, and one side of the case is bonded to the board with an adhesive to mount the board. The surface to be joined to must be the back surface, and in the previous process, the surface that was the upper surface was read by the sensor as the front surface or the back surface, but since the case surface is flat, both the front surface and the back surface Since it was totally reflected, many reading errors occurred. Therefore, the printed surface may be bonded to the substrate.

[0004]

[Means for Solving the Problems]

 Therefore, the piezoelectric ceramic vibrator of the present invention includes a piezoelectric ceramic plate having excitation electrodes formed on the front and back surfaces, at least two lead terminal plates that are in contact with the piezoelectric ceramic plate and lead out the electrodes to the outside, and these piezoelectric ceramic plates. A case in which the plate and the lead terminal plate are integrally housed, and the tip lead portion of the lead terminal plate is electrically joined to an electrode on the substrate, and one side surface of the case is joined to the substrate. In the piezoelectric ceramic vibrator, at least the substrate bonding surface of the case was roughened. Further, the printed surface of the case is also roughened.

[0005]

[Action]

 This is because at least the surface of the case where the board is bonded has been roughened to increase the surface area per fixed unit compared to the conventional method, so it is possible to bond it to the board with the same strength with a small amount of adhesive. became. Further, since the printed surface of the case is also roughened, the surface area per fixed unit is similarly increased as compared with the conventional case, so that the printing ink can be applied well. Moreover, neither the printing surface (front surface) nor the bonding surface (rear surface) to the printing surface is totally reflected, and the printing ink on the printing surface is partially reflected, which makes it easy to distinguish between the front surface and the back surface.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an embodiment of the present invention mounted on a substrate. FIG. 2 is a front view of a substrate bonding surface of another embodiment. FIG. 3 is a front view of the printing surface. The same parts as those in the other examples are designated by the same reference numerals. The piezoelectric ceramic oscillator includes a piezoelectric ceramic plate (not shown) on which excitation electrodes are formed, lead terminal plates 21 and 22 having a portion in contact with the piezoelectric ceramic plate, and one of these piezoelectric ceramic plates and the lead terminal plates 21 and 22. It comprises a case 1 for accommodating the parts, and a resin sealing material (not shown) filled in the case lead-out portions of the lead terminal plates 21 and 22. The piezoelectric ceramic plate is obtained by cutting out a PZT type porcelain plate which is polarized so as to cause contour vibration into a rectangular shape, and excitation electrodes made of a thin metal material such as silver are provided on almost the entire front and back surfaces of the plate. Although not shown, the lead terminal plates 21 and 22 that are in contact with the central portion of the piezoelectric ceramic plate and are used for electromechanical joining are made of metal plates, and are not shown in the drawing, but are located above and below the contact point with the piezoelectric ceramic plate. Has a curved portion that is gradually separated from each other, and is in contact with the upper side and the lower side of the case 1. The case 1 is made of an insulating resin material and has a rectangular parallelepiped shape as a whole and is hollow. The piezoelectric ceramic plate and the lead terminal plates 21 and 22 are integrally housed, and a notch is provided below them. The lead terminal plates 21 and 22 are partially pulled out from the above. By housing in the case, the piezoelectric ceramic plate is sandwiched by the spring property of the curved portion of the lead terminal plate. The lead terminal board lead-out portion of the case is provided with a recess (not shown) for filling the sealing resin material. Therefore, the substrate bonding surface 11 of the case can be roughened by processing a resin molding die with electric processing, chemicals or the like. Further, as shown in FIG. 2, the substrate bonding surface 12 of the case may be textured (the rough surface is made fine). Then, airtight sealing is performed using a sealing resin material. After that, the leading end portions of the lead terminal plates 21 and 22 are inserted into the holes of the substrate 5 and bent, and they are laid on the substrate 5, and the substrate bonding surface 11 of the case is bonded to the substrate 5 with an adhesive and mounted.

Then, the printing surface 13 of the piezoelectric ceramic vibrator configured as shown in FIG. 3 is also roughened to attach immortal ink, UV ink, etc. to the letterpress in the printing machine, When the marking 3 such as the frequency and the manufacturing lot number is imprinted, the printing ink can be applied more easily than before. Then, when the marked piezoelectric ceramic vibrator is applied to the sensor, only the printing ink on the printing surface is partially reflected, so read whether the upper surface is the printing surface 13 or the substrate bonding surface 12, and print. If the surface is on the upper side, the tip portions of the lead terminal plates 21 and 22 are inserted into the holes of the board, bent, laid on the board, and the board bonding surface 11 of the case is bonded to the board with an adhesive for mounting. .

Further, in the present invention, it has been described that only the substrate bonding surface and the printing surface are roughened, but all the surfaces of the case 1 may be roughened, and all the surfaces of the case 1 may be roughened. By roughening the surface, there is no directionality such as the adhesive direction and the printing direction, so workability in rough surface processing is improved.

[0009]

[Effect of device]

 According to the present invention, since the surface area per unit of at least the substrate bonding surface of the case is increased as compared with the conventional case, it is possible to bond the same strength to the substrate with a small amount of adhesive. Therefore, it is possible to reduce the cost of the adhesive due to the use of a large amount of the adhesive and to shorten the bonding work time. Moreover, since the electrical characteristics are stable due to impact resistance, a highly reliable piezoelectric ceramic resonator can be obtained. In addition, the printed surface of the case has also been roughened, so that the surface area per fixed unit is also increased compared to the conventional case, so that the printing ink can ride well, resulting in a decrease in the printing yield and peeling of the printing. And so on. Moreover, neither the printing surface (front surface) nor the joining surface (rear surface) is totally reflected, and the printing ink on the printing surface is partially reflected. Since there is no space, the printed surface is no longer bonded to the substrate. Further, when roughening is performed on all the surfaces of the case, the workability in roughening is improved because there is no limitation such as the substrate bonding surface and the printing surface.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a front view of a substrate bonding surface of another embodiment.

FIG. 3 is a front view of a printing surface showing an embodiment of the present invention.

[Explanation of symbols]

 1 Case 11, 12 Board Bonding Surface 13 Printing Surface 21, 22 Lead Terminal Board 3 Marking 4 Adhesive 5 Board

Claims (2)

[Scope of utility model registration request] 1. A piezoelectric ceramic plate having excitation electrodes formed on the front and back surfaces, at least two lead terminal plates which are in contact with the piezoelectric ceramic plate and lead out the electrodes to the outside, and the piezoelectric ceramic plate and the lead terminal plate are integrated. In a piezoelectric ceramic oscillator, wherein a tip lead portion of the lead terminal plate is electrically joined to an electrode on a substrate, and one side surface of the case is joined to the substrate. Of at least the substrate bonding surface is roughened, and a piezoelectric ceramic resonator. 2. The piezoelectric ceramic vibrator according to claim 1, wherein the printed surface of the case is roughened.