JPH069507Y2 - Heatable block fixing device - Google Patents

Description

The present invention relates to a die bonding apparatus, and more particularly to a heater block fixing device for fixing a heater block on which a lead frame is placed and heated to a heater block mounting base.

(B) Prior art Generally, a heater block for mounting and heating a lead frame as shown in FIG. 5 of JP-A-57-19439 is heated up to about 400 ° C., and therefore, a heater block mounting base is provided through a heat insulating material. It was fixed in the structure as shown in FIGS. 2, 3, and 4.

The drawing numbers and configurations will be described with reference to FIGS. 2, 3, and 4, but the same elements or corresponding elements have the same numbers in FIGS. 2, 3, and 4. 4 (a) and (b) are a side view and a front view showing a conventional example, respectively. In FIG. 2, (1) is a heater block, (2) is a heat insulating material, (3) is a heater block mounting base, (4) is a fixing bolt, L is the heater block length, and A is a die bonding position. . In Fig. 3 (5)
Is a nut for mounting the heater block, and d is a gap. Fourth
In the figure, (6) is a support plate to which the heater block mounting base (3) is fixed, (7) is a tension spring, and (8) is a locking portion for locking the tension spring provided in the heater block. , (9) are locking portions for locking the tension springs provided on the support plate.

Next, the characteristics of the heater block fixing device shown in FIGS. 2, 3, and 4 of the conventional example will be described. In the configuration of FIG. 2, when L is long, the displacement of the heater block (1) due to expansion due to heating is remarkable. Therefore, there is a problem that the heater block (1) is warped because the screwing portion of the fixing bolt (4) cannot be displaced in the horizontal direction. The conventional example shown in FIG. 3 addresses the above problem. However, in the configuration of FIG. 3, the heater block (1) may rise by the distance d, so that there is a problem that the level of the die bond position changes and the bondability deteriorates. The above-mentioned two problems are dealt with by the constitution shown in FIG. 4, which corresponds to the horizontal displacement by the displacement of the tension spring (7) and the heater block (1) by the biasing force of the tension spring (7). The heater block mounting base (3) is attached via a heat insulating material (2).

(C) Problems to be solved by the device In the conventional example shown in FIG. 4 described above, the problems of the conventional example shown in FIGS. 2 and 3 are dealt with, the thermal expansion of the heater block is dealt with, and the die bonding is performed. The heater block can be fixed by keeping the level constant, but since a pair of tension springs are used, if the spring pressure is slightly different, the pressing pressure will not be constant within the heater block mounting base surface, Since the pressure is fixed, the pressing pressure cannot be adjusted.The tension spring is repeatedly displaced due to expansion and contraction due to the temperature change of the heater block, and is heated to lock on the heater block proximity side, so that the tension spring is quickly fatigued. Since the locking portion of the tension spring projects outward, there is a problem that it hinders space saving.

(D) Means for Solving the Problems Therefore, in the present invention, in a heater block fixing device for fixing a heater block for mounting and heating a lead frame, the heater block is fixed to a heater block mounting base. Fixing means, a shaft having one end fixed to the lower portion of the heater block, a through hole provided in the mounting base for loosely inserting the shaft, and attached to the other end of the shaft loosely inserted in the through hole, An urging unit for urging the heater base in the heater block direction while allowing the heater block to be displaced in the horizontal direction with respect to the mounting base, and an adjusting unit for adjusting the urging force of the urging unit are provided. It is a thing.

(E) Operation With the above configuration, the heater block is fixed to the heater block mounting base by the fixing means while the heater block mounting base is pressed and biased in the heater block direction by the biasing means. The shaft, one end of which is fixed to the lower part of the heater block, is also horizontally displaced in the through hole provided in the heater block mounting base into which the shaft is loosely inserted due to the horizontal displacement of the heater block due to thermal expansion and contraction. To do. Further, the operator adjusts the urging force of the urging means through the adjusting means with respect to the vertical displacement due to the thermal expansion and contraction of the heater block.

(F) Embodiments The heater block fixing device of the present invention will be described with reference to the drawing numbers. FIGS. 1 (a) and (b) show the structure of the heater block attaching device of the present invention. It is a sectional view and a principal part sectional view in a XX 'plane.

Figure 1 (b) and (b) Figure number and structure will be explained
(10) is a heater block, (11) is a heat insulating material, (12) is a heater block mounting base for fixing the heater block, (13) is a bolt as a fixing means for fixing the heater block to the heater block mounting base, (14) is a first nut, (15) is a shaft provided with screw portions at both ends, and one end is screwed into the lower part of the heater block and fixed to the heater block by the first nut, (16) is the heater A compression spring as a biasing means for pressing the block and the heater block mounting base by pressure, and (17) is a first spring that presses against the lower surface of the heater block mounting base (12) by the biasing force of the compression spring and penetrates the shaft. A receiving flange, (18) is a second spring receiving flange that penetrates the shaft installed in the first spring receiving flange via the compression spring, and (19) is a screw part at the other end of the shaft. The second spring receiver that is inserted Second nut arranged on the lower surface of the flange, (20) is a through hole for loosely inserting the shaft is provided in the heater block mounting base, A is the bonding position, L is the length of the heater block.

The setting operation will be described below. If the operator expands or contracts the heater block (10) or the compression spring (16) due to heat after the temperature of the heater block (10) has stabilized, the operator can set the second spring receiving flange ( 18) and the second nut (19) are displaced to adjust the pressing pressure, that is, the urging force of the compression spring (16), so that the heater block (1)
The bonding position A of 0) is maintained at the set position. Further, even when there is a processing error or an assembly error, the heater block (10) is attached to the heater block while maintaining the bonding position A by adjusting the biasing force of the compression spring (16) as described above. It can be fixed to the base (12).

Next, a description will be given of how the heater block fixing device according to the present invention copes with a temperature change particularly when L is long. When the heater block (10) expands or contracts due to a temperature change, the heater block (10) The shaft (15) fixed to the shaft (15) is displaced together with the heater block in the gap between the through hole (20) and the shaft (15), and at the same time is compressed as a biasing means attached to the shaft (15). By continuously compressing the heater block (10) and the heater block mounting base (12) through the heat insulating material (11) by the urging force of the spring (16), the heater block (10) is displaced due to temperature change. Also, with the bonding position A fixed, the heater block (10) and the heater block mounting base (12) are fixed with a stable pressing pressure.

In addition, since the heater block (10) and the compression spring (16) expand and contract because the set temperature of the heater block (10) is changed by switching the model, etc., when the urging force of the compression spring (16) is to be changed, As described above, the worker displaces the second spring receiving flange (18) and the second nut (19).

Further, similarly, it is possible to deal with a change with time.

(G) Effect of the Invention As described above, according to the present invention, the heater block can be horizontally displaced by thermal expansion and contraction of the heater block with a simple structure, and the heater block and the heater block mounting base are fixed by a stable pressing pressure. It is possible to reduce the trouble at the bonding position. Further, since the operator can adjust the biasing force of the biasing means through the adjusting means, the adjustment to the bonding position of the heater block at the time of setting becomes easy and the vertical direction can be changed when the set temperature of the heater block is changed. It can also be dealt with when heat expansion or contraction occurs.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part for explaining a heater block fixing device of the present invention, FIG. 2 is a front view showing a conventional example, FIG. 3 is a sectional view of an essential part for a conventional example, and FIG. It is a drawing shown. (10) …… Heater block, (12) …… Heater block mounting base, (13) …… Bolt, (15) …… Shaft, (16) …… Compression spring, (20) …… Through hole.

Claims (1)

[Scope of utility model registration request] 1. A heater block fixing device for fixing a heater block for mounting and heating a lead frame, comprising: fixing means for fixing the heater block to a heater block mounting base; A fixed shaft, a through hole provided in the mounting base into which the shaft is loosely inserted, and the heater block mounted on the other end of the shaft loosely inserted in the through hole in a horizontal direction with respect to the mounting base. A heater block fixing device, comprising: a biasing unit that is biased to bias the mounting base in the heater block direction while being displaceable; and an adjusting unit that can adjust the biasing force of the biasing unit.