JPH0749361Y2 - IC pin scale - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention finds a pin of a predetermined number out of pins of an IC incorporated in a printed circuit board with a microscope, inserts a pinching tool made of an ultrafine steel wire into the pin, and pinches the pin with a tester. The present invention relates to an IC pin scale used when inspecting whether or not the waveform of is output.

[0002]

2. Description of the Related Art Conventionally, a pin scale as shown in FIG. 3 has been used to find a predetermined pin with a microscope.

That is, in the conventional pin scale, a short bent piece 22 is vertically provided on the front end surface of a horizontally long substrate 21, and the bent piece 22 has the same pitch as the pitch of the pins 24 of the IC 23.
The scale 25 starting from 1 is provided, and long lines 26 serving as marks are provided at 10-digit positions of the scale 25, respectively, and a hooking piece 27 abutting against one end face 23a of the IC 23 is vertically provided at the end. Then, the latching piece 27 is brought into contact with the one end portion 23a of the IC 23 so that the first scale 2
It was formed so that the first pin 24a of the side surface portion was always located on 5a.

Then, while looking at the microscope, the pin scale was set on the IC 23 for each end side face, and the pin 24 at the predetermined position was read out by reading the scale 25.

[0005]

However, in the above-mentioned conventional pin scale, since the whole is formed of a horizontally long plate, it is difficult to set it on the IC so that it does not move, and it falls off. There was a point.

Further, there is a problem that the pin scale is misaligned and a misread occurs when the pin is visually recognized by setting it on the IC.

Furthermore, a reference point, which is a starting position for counting the number of the pin, is displayed on the IC, and the reference point from the first pin on the side face located at the reference point is displayed. As they are counted in the clockwise direction in order, since the IC is always square, 1/4 of all pins are evenly arranged on the four side surfaces. Therefore, for example, when the total number of pins of the IC is 160, the position of the pin on the side surface (the number of pins is 40) having the reference point is in the order of the scale of the pin scale, but the other three side surfaces (each The number of pins on each side (40 pins each) must be calculated from the 41st, 81st, and 121st pins, respectively, and there is a problem that misreading is likely to occur in the pin scale starting from 0.

The present invention is intended to provide an IC pin scale intended to solve the above-mentioned conventional problems.

[0009]

According to the present invention, an inclined wall surface that expands outward is provided on the four side end surfaces of a rectangular top plate, and the lower end edge of the inclined wall surface abuts the side end surface of the IC. A square frame-shaped vertical piece is continuously formed to form a scale main body, and the scale is displayed on the inclined wall surface and the vertical piece at the same pitch as the IC pin pitch, and the scale at the 10-digit position of the scale is set to the top. The display is extended to the board, the 10-digit numerical values are sequentially displayed in the counterclockwise direction, the 5-digit scale is displayed slightly longer, and the total number of IC pins is displayed on the top surface of the top board. The above-mentioned problems have been solved by adopting a means in which a rubber plate is fixed to the lower surface of the top plate and a space is provided between the lower end edge of the vertical piece and the upper end edge of the pin.

[0010]

According to the present invention having the above-described structure, by covering the IC with the scale main body, the pins and the scales are aligned with each other, and the scale main body is not displaced or separated.
It is possible to specify the predetermined pin.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. On four side end faces of a rectangular top plate 3 having the same size as an upper plate 2 of an IC 1, an inclined wall surface expanded outward. 4 is provided, and the side end surface 1a of the IC 1 is provided on the lower end edge of the inclined wall surface 4.
A square frame-shaped vertical piece 5 that abuts on the scale main body 6 is formed.

On the outer side surfaces of the inclined wall surface 4 and the vertical piece 5 of the scale body 6, a scale 8 is displayed at the same pitch as the pitch of the pins 7 of the IC 1, and the scale 8a at the 10-digit position of the scale 8 is lengthened. The display is extended to the top plate 3, and the top plate 3 is displayed counterclockwise according to the pin number of IC1.
The numerical value 9 is displayed for each digit in sequence as 10, 20, ... Or with the 10th digit omitted and displayed as 1, 2 ,. The scale 8b is extended and displayed near the middle of the inclined wall surface 4, and the total number 1 of pins of the IC 1 is displayed on the top plate 3 of the scale body 6.
0 is set.

Further, when the scale body 6 is capped on the IC 1 on the lower surface of the top plate 3 of the scale body 6, as shown in FIG. 2, the lower edge 5a of the vertical piece 5 and the upper edge of the pin 7 are formed. A rubber plate 12 is fixed so as to prevent a short circuit by providing an interval 11 of at least about 0.3 mm between them and to reduce the impact when the scale body 6 is capped on the IC 1. In the figure, 13 is a printed circuit board.

Next, the operation of the embodiment of the present invention will be described. First, the scale body 6 is placed on the IC 1 to be inspected.
When the first scale and the first pin located at the reference point are matched and crowned, the numbers of the pins 7 and the scales 8 match. At this time, the lower end edge 5a of the vertical piece 5 has the pin 7
Since there is an interval 11 from the above, there is no fear of short circuit.
Then, while looking at the microscope, look for the predetermined pin 7 while visually observing the scale 8 provided on the scale body 6,
A pin, which is not shown, of a pin made of ultra-fine steel wire is sandwiched between the pins 7 found, and the pin 7 is inspected by a tester or the like.

The scale body 6 is capped by the upper plate 2 of the IC 1, the vertical piece 5 does not serve as a stopper to prevent the scale body 6 from being displaced, and the numerical value 9 of the scale 8 is every 10 digits in the counterclockwise direction. Since it is displayed in sequence, it is possible to accurately find any pin on any side.

[0016]

Since the present invention is as described above, it can be used for all ICs by preparing in advance a plurality of scale bodies having a scale corresponding to the total number of IC pins. Also, the scale body can be easily crowned to the IC without any risk of slipping or disengagement, and it is possible to find the pin of any number extremely quickly and surely to speed up the work. it can. The IC pin scale of the present invention is a QFP type pin or P
It can be used for ICs with any of the LCC type pins.

[Brief description of drawings]

FIG. 1 is a plan view showing a use state of an IC pin scale of the present invention.

FIG. 2 is a partially cutaway enlarged sectional view showing a usage state of the IC pin scale of the present invention.

FIG. 3 is a perspective view of a conventional IC pin scale.

[Explanation of Codes] 1 IC, 1a Side end surface of IC, 3 Top plate, 4
Inclined wall surface, 5 vertical piece, 5a lower edge of vertical piece,
6 scale body, 7 pins, 8 scales, 9
10 digit number, 10 total number display, 11 interval, 1
2 rubber plate.

Claims (1)

[Scope of utility model registration request] 1. A square-shaped top plate is provided with inclined wall surfaces that expand outward on four side end surfaces, and the lower end edge of the inclined wall surface is I-shaped.
A rectangular frame-shaped vertical piece that abuts on the side end surface of C is continuously provided to form a scale body, and the scale is displayed on the inclined wall surface and the vertical piece at the same pitch as the IC pin pitch. The 10-digit scale is extended to the top plate and displayed, and each of the 10-digit numerical values is sequentially displayed in the counterclockwise direction, and the 5-digit scale is displayed slightly longer, and the IC pin is displayed on the top surface of the top plate. Of the IC pin scale, in which a rubber plate is fixed to the lower surface of the top plate so that there is a space between the lower edge of the vertical piece and the upper edge of the pin.