JPH0140196Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention relates to a collect touch detection mechanism for a die bonder that bonds a die to a lead frame, a substrate, or the like.

(Prior Art) As is well known, a die is vacuum-adsorbed to a collect by a die bonder and bonded to a lead frame or the like.

By the way, in a die bonder, when the collet is replaced, a collet touch inspection is performed to check whether the collet evenly contacts the surface of the lead frame before starting the die bonder. Conventionally, this collet touch inspection is performed by looking at the indentation on the lead frame that is created when the collet is lowered and comes into contact with the lead frame. in this case,
Since the operator has to rely on the operator's intuition to determine whether or not the collet has contacted the lead frame, the workability is poor and the collet may be damaged when making impressions.

(Purpose of the invention) The purpose of the invention is to easily detect the position where the collet contacts the lead frame, etc.
To provide a collet touch detection mechanism for a die bonder which can shorten working time and prevent damage to the collet.

(Embodiment of the invention) Hereinafter, an embodiment of the invention will be described with reference to the drawings.
Lead frame 1 is intermittently conveyed on guide rail 2 by a drive means (not shown). A collet 4 for sucking the die 3 is fixed to one end of a bonding arm 5 above the guide rail 2, and a pipe 6 connected to a vacuum pump (not shown) is connected to the collet 4. The lower end of the bonding arm 5 is fixed to a support shaft 8 rotatably supported by a movable body 7.
A contact terminal 10 is connected above the other end via an insulating member 9.
is fixed. A contact screw 12 is attached to the movable body 7 through an insulating bushing 11 at a position opposite to the contact terminal 10, and the bonding arm 5 is compressed so that the contact terminal 10 is always in contact with the contact screw 12. It is biased by a spring 13. The contact terminal 10 and the contact screw 12 are connected to a control device 14, and a voltage is applied from the control device 14. Also, at the upper end of the movable body 7 there is a column 1.
5. A lamp 17 is attached via the support plate 16, and this lamp 17 is connected to the control device 14. Therefore, the contact terminal 10 and the contact screw 12
When the contact is removed, the control device 14 detects this change in voltage, and the lamp 17 is turned on in response to this signal.

The movable body 7 has a female threaded portion 7a, and this female threaded portion 7a is screwed into a driving screw 20 extending vertically. The drive screw 20 is rotatably supported by a main body 22 fixed on an XY table 21.
The main body 22 includes a motor 2 that rotates the drive screw 20.
3 is fixed, and the motor 23 is controlled by the control device 14. Further, the movable body 7 is fitted into the vertical groove portion 22a of the main body 22 so as to be able to move up and down and not rotate.

Next, the effect will be explained. The figure shows a state in which the XY table 21 and the motor 23 are driven, and the die bonding collet 4 vacuum suctions and conveys the die 3 from a die supply section (not shown), and the die 3 is positioned above the lead frame 1. From this state, when the motor 23 rotates forward according to a command from the control device 14 and the drive screw 20 rotates, the movable body 7 descends. As a result, the bonding arm 5 also descends, and the die 3 comes into contact with the lead frame 1. When the movable body 7 further descends from this state, the bonding arm 5 rotates clockwise about the support shaft 8, and the contact terminal 10 separates from the contact screw 12. As a result, the contact terminal 10 and the contact screw 12 are no longer electrically conductive, so the control device 14 uses this signal to control the lamp 17.
At the same time, it outputs a signal to stop the motor 23. At the same time, the vacuum in the collector 4 is cut off. The die 3 is thereby bonded to the lead frame 1. Thereafter, the motor 23 rotates in reverse, and the collet 4 is raised.

By the way, in the collet touch inspection when the collet 4 is replaced, the motor 23 is driven to lower the collet 4 without the die 3 being attracted to the collet 4. As a result, the collet 4 descends and comes into contact with the lead frame 1, and when the motor 23 rotates further from this state, the contact terminal 10 and the contact screw 12 separate as described above, the lamp 17 lights up, and the motor 23 stops. .

In this way, since the lamp 17 lights up when the collet 4 comes into contact with the lead frame 1, it becomes easy to set the height level of the collet 4, and the working time can be shortened. Also, collect 4 is lead frame 1.
Since it is possible to detect when the collet 4 comes into contact with the collet 4, damage to the collet 4 can be prevented.

(Effects of the invention) As is clear from the above description, according to the invention, working time can be shortened and damage to the die and collet can be prevented.

[Brief explanation of drawings]

The figure is a sectional view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Lead frame, 3... Die, 4... Collet, 5... Bonding arm, 7... Movable body, 8... Support shaft, 9... Insulating member, 10... Contact terminal, 11... Insulation Bush, 12...Contact screw, 17...Lamp.

Claims (1)

[Scope of utility model registration request] A collet that vacuum-chucks the die, a bonding arm that holds the collet, and a movable body to which the bonding arm is rotatably attached.
A drive screw that moves this movable body up and down, a motor that rotates this drive screw, a contact terminal that is insulated and fixed to the bonding arm, and an insulated mounting on the movable body so as to make contact with the contact terminal. A collect touch detection mechanism for a die bonder, comprising: a contact screw that is connected to the contact terminal; and a lamp that lights up when the contact terminal and the contact screw are separated from each other.