JP2511256Y2 - Laser trimmer - Google Patents

Description

[Detailed description of the device]

[0001]

This invention relates to a laser trimmer,
In particular, the present invention relates to a laser trimmer that performs function trimming by irradiating a resistor, a capacitor, and the like mounted on both sides of a mounting board with laser light.

[0002]

2. Description of the Related Art Conventionally, a laser trimmer of this type irradiates an electric component mounted on a wiring board, for example, a resistor and a capacitor with a laser so that the resistance and the capacitance have appropriate values. The functional part of the capacitor was processed and adjusted. In general, electrical components are mounted on one side or both sides of a mounting board, and electrical components to be trimmed are mounted on one side. Therefore, in the laser trimmer as well, the mounting table for holding the substrate only needs to take into consideration the burr of the electric components to be mounted, and the rest can be processed in the same manner as an ordinary unmounted wiring substrate. Also electrical parts that are trimmed,
For example, for a probe that measures the resistance value of a resistor, if it has a function of probing only one side of the board and a needle tip with a stroke longer than the height of the mounted electrical parts, there will be no problem in measurement. It was

[0003]

[Problems to be solved by the invention] However, in recent years,
As the mounting density on the wiring board becomes higher, double-sided mounting on the board becomes common, and it becomes necessary to perform function trimming on both sides. However, in the above-mentioned conventional laser trimmer, there is no one provided with a probe for measuring electrical components attached to both sides, and even if it can be realized, the probe on the back side of the substrate results in preventing the visibility, There is a drawback that it becomes difficult to align and check the probe, contact failure occurs, and it cannot be applied practically. In particular, when trimming a large number of different types of mounting boards, the frequency of probe replacement and the number of times the board is turned upside down increase, so it is clear that the ratio of preparation time other than trimming time increases.

An object of the present invention is to provide a laser trimmer that solves such a problem.

[0005]

The laser trimmer of the present invention is provided with a mounting table for mounting a mounting board on which electrical components are mounted on both sides, and trimming while measuring the characteristics by irradiating the electrical components with a laser beam. In the laser trimmer that obtains the characteristic value of the electric component, two probe cards that are arranged on the front and back sides of the mounting board and measure the characteristics of the electric component, and the relative positions of the probe card and the mounting board are set. A guide pole 13 inserted into a positioning hole formed for determining, and a separate probe for vertically standing the two probe cards and the mounting substrate in advance and determining the relative position of each other using the positioning hole. And an alignment device.

[0006]

1 is a perspective view of a mechanism portion for mounting a mounting substrate in a laser trimmer showing an embodiment of the present invention, FIG. 2 is a perspective view showing a probe alignment device attached to the laser trimmer of FIG. 1, and FIG. It is a perspective view which shows the card mounter of 1 and a probe card.

As shown in FIG. 1, the laser trimmer of the present invention is mounted on a stage 9 of a main body and has a mounting table 3 having a mounting portion for positioning and holding a mounting substrate 12 on which electric components are mounted on both sides, and a mounting substrate. 12, an upper probe card 1 and a lower probe card 2 having a plurality of probe pins 19 for measuring electrical components on the front and back surfaces, a card mounting adapter 10 for mounting the upper and lower probe cards 1 and 2, and this card mounting adapter 10 And the card mounters 4a and 4b that move in the vertical direction, the probe card feeding mechanism 5 that controls the vertical movement of these card mounters 4a and 4b, and the upper probe card 1,
In order to determine the relative positions of the lower probe card 2 and the mounting substrate 12, a guide pole 13 penetrating through a common positioning hole of the two probe cards 1 and 2 and the mounting portion of the mounting table.
It has and.

Further, the laser trimmer is additionally provided with a probe alignment device for preliminarily aligning the measuring terminals and the probe pins of the electric parts of the mounting board shown in FIG. As shown in the same figure, this probe alignment apparatus has an X stage 20 fitted in a guide mechanism on a base 16 and a mechanism having the same mechanism as the card mount of FIG. 1 mounted on the X stage 20. Stand-by spare card mounts 4c, a Y stage 21 that stands in a position sandwiched between these two stand-by card mounts 4c, and moves in the Y direction, and a rack 17 that is placed on this Y stage 21.
And a mounting plate 18 which moves up and down on the rack 17 and has the same structure as the mounting portion of the mounting table of FIG. 1 and which positions and mounts the mounting substrate.

Next, the operation of this laser trimmer will be described. The mounting substrate is positioned on the mounting plate 18 using the probe alignment device shown in FIG. Next, subsequently, the upper probe card 1 and the lower probe card 2 are attached to the spare card mounts 4c and 4d. Next, the Y stage 21 and the mounting plate 18 are moved and aligned so that the positioning holes 14 and 15 of the upper and lower probe cards 1 and 2 and the positioning hole of the mounting plate 18 are aligned. In order to confirm the alignment, it is more reliable if the guide pole 13 shown in FIG. 3 is inserted or not. Next, the X stage 20 is moved to determine whether or not the probe pins of the upper probe card 1 and the lower probe card 2 match the measurement terminals of the electrical components to be trimmed, and the probe pins and the measurement terminals are steadily contacted. Check visually for If there is a displacement, the position of the probe pin on the probe card is corrected. This operation completes the alignment between the probe card and the mounting board.

Next, the probe card and the mounting substrate on which the alignment is completed are removed from the probe alignment apparatus, and the upper probe card 1 and the lower probe card 2 are attached to the card mounters 4a and 4b, respectively, as shown in FIG. Then, the guide pole 13 is inserted into the positioning holes 14 and 15, and it is confirmed whether the positions are aligned. Next, as shown in FIG. 1, the card mounters 4a and 4b are moved in the direction of the arrow in order to increase the distance. Then, the mounting substrate 12 is mounted on the mounting portion of the mounting table 3. Further, the guide poles 13 are inserted into the positioning holes so that they are not displaced from each other.

Next, the upper probe card 1 is lowered,
The terminal of the electric component of the mounting board 12 and the probe pin 16 are brought into contact with each other. Next, the laser beam 11 is applied to the electric component to start trimming. At this time, the trimming is stopped when the measured value shows a predetermined value while monitoring the measured value with a measuring device (not shown). When the trimming of one electric component is completed, the upper probe card 1 is raised, the stage 9 is moved, the other electric component is positioned, and the same trimming is performed.

Next, when the trimming of the electric components on one side is completed, the mounting board 12 is placed upside down on the mounting portion of the mounting table 3, and the upper probe card 1 on the card mounter 4a is mounted.
Is replaced with the lower probe card 2. And again,
Insert the guide pole 13 away from the positioning holes 14 and 15. Next, the stage 9 is moved to position the electric component to be trimmed, the card mounter 4a is lowered, the probe pin 16 is brought into contact with the terminal of the electric component, and the laser beam 11 is irradiated to perform trimming. In this way, all trimming of the electric components mounted on both sides of the mounting board is completed.

The laser trimmer in this embodiment is provided with two probe cards above and below, for example, when the trimming portion of the electrical components of the mounting board is on the front side of the board and the terminals to be measured are on the back side. There are also cases where the probing work is not performed and trimming is not performed. Therefore, this laser trimmer has an advantage of not only performing the trimming work but also the function of inspecting the mounting substrate. Another advantage of providing the probe cards on the upper and lower sides is that the laser oscillators can be mounted on the upper and lower sides and trimming can be performed more efficiently if the handling of the laser oscillator can be ensured.

[0014]

As described above, according to the present invention, the upper and lower two probe cards for probing the front and back surfaces of the mounting board and the positions of the measuring terminals and the probe pins of the electric components of the mounting board are pre-aligned. A separate probe alignment device for vertically arranging the mounting board and the two probe cards so that their relative positions are aligned with each other, and a guide pole inserted into a common positioning hole formed in the mounting portion of the two probe cards and the mounting board. By providing both, the both sides of the mounting substrate can be simultaneously probed, and the contact state of the probe pin can be visually confirmed in advance, so that no contact failure occurs. Therefore, there is an effect that the unnecessary preparation time can be further shortened and a laser trimmer capable of performing accurate trimming can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a mechanism portion for mounting a mounting substrate in a laser trimmer showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a probe alignment device attached to the laser trimmer of FIG.

3 is a perspective view showing a card mounter and a probe card of FIG. 1. FIG.

[Explanation of symbols]

 1 upper probe card 2 lower probe card 3 mounting table 4a, 4b card mounter 4c, 4d spare card mounter 5 probe card feeding mechanism 9 stage 10 card mounting adapter 12 mounting board 13 guide pole 14, 15 positioning hole 16 probe pin 17 rack 18 Mounting plate 20 X stage 21 Y stage

Claims (1)

(57) [Scope of utility model registration request] 1. A mounting table for mounting a mounting board on which electric components are mounted on both sides, the characteristic value of the electric component is obtained by trimming while measuring the characteristic by irradiating the electric component with a laser beam. In the laser trimmer, two probe cards that are arranged on the front and back sides of the mounting board and measure the characteristics of the electric parts, and positioning holes formed to determine the relative positions of these probe cards and the mounting board are provided. It has a guide pole 13 to be inserted, and a separate probe alignment device that preliminarily stands two probe cards and the mounting substrate vertically and utilizes the positioning holes to determine their relative positions. Laser trimmer.