JPH098162A - Marking apparatus - Google Patents

Abstract

PURPOSE: To miniaturize an apparatus and to execute a marking operation with high accuracy and stably by a method wherein a wheel in a pedestal part is turned and a frame material which is conveyed is supported along its outer circumference. CONSTITUTION: A marking apparatus 1 is provided with a feed part 2 by which a long frame material 10 to be wound on a feeding reel 21 is sent out sequentially, with a pedestal part 3 by which the frame material 10 to be sent out from the feed part 2 and a product 11 are supported and with a marking part 4 which puts a prescribed mark onto the surface of the product 11 supported by the pedestal part 3. The pedestal part 3 which supports especially the frame material 10 and the product 11 uses a turning cradle wheel 31, and the frame material is supported on a curved surface by the outer circumference of the cradle wheel 31. As a result, as compared with a case in which the frame material is supported on a plane, the apparatus can be miniaturized, the frame material 10 can be positioned and conveyed surely, and a marking treatment to an accurate position can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marking device for marking a surface of a product formed on a frame material with a predetermined mark.

[0002]

2. Description of the Related Art For example, when a semiconductor device is manufactured by using a frame material such as a lead frame, a chip-shaped semiconductor element is mounted on the frame material, wiring is performed by using a bonding wire, and the like. A semiconductor element, a bonding wire, and the like are sealed with resin to form a package. In addition, when marking such a product number as such a semiconductor device, after the sealing process with the molding resin is performed, the frame material is inserted into the marking device and the package surface of the product conveyed with the frame material. For example, a marking process using laser light irradiation is performed.

FIG. 4 is a schematic view for explaining a conventional marking device. That is, this marking device 1'is
The frame member 10 and the product 11 that guide the frame member 10 sent from the supply unit 2 via the buffer wheel 51 mainly for supplying the long frame member 10 wound around the supply reel 21. Laser beam 41a is applied to the pedestal portion 3'for supporting the lower part of the package and the package surface of the product 11 formed on the frame material 10 which is arranged above the pedestal portion 3'and is supported by the pedestal portion 3 '. And a marking portion 4 for giving a predetermined mark.

In this marking device 1 ', the frame material 10 is changed from the supply reel 21 to the buffer wheel 51.
It is sent to the pedestal portion 3 ′ via the and is continuously conveyed by the rotation of the drive wheel 53 ′ arranged on the lower conveyance side of the pedestal portion 3 ′. At this time, the buffer wheel 51 moves up and down according to the amount of slack of the frame material 10, and when the upper limit sensor 51a detects the upward movement of the frame material 10, the supply of the frame material 10 from the supply unit 2 is started, and the downward movement is performed. The supply of the frame material 10 from the supply unit 2 is stopped when the lower limit sensor 51b detects the movement to the.

The pedestal portion 3'supports the frame material 10 to be conveyed by a plate-shaped receiving portion 31 'while guiding it. Then, while the frame material 10 is supported, a predetermined laser beam 41a is emitted from the marking portion 4 to mark the package surface of the product 11 attached to the frame material 10.

When marking is performed using the laser beam 41a, a brush 32 is provided on the side of the pedestal portion 3'convenient to convey for the purpose of preventing marking or the like due to adhesion of dust. The dust on the surface of the package 11 can be removed. Further, since soot adheres to the surface of the package resin due to the thermal energy of the laser light at the time of marking, a brush 33 is also provided on the lower transfer side of the pedestal portion 3'to remove the soot.

Further, an inspection camera 6 is provided on the lower side of the conveyance than the brush 33, so that the quality of the marking can be inspected by capturing the surface image of the marked package.

FIG. 5 is an enlarged sectional view for explaining the main part of the conventional example. That is, in the brush portion shown in FIG. 5A, a plate-shaped receiving No. 31 ′ for supporting the lower portion of the frame material 10 and the product 11 is provided, and the brush 3
The distortion of the frame material 10 due to the pressing force of 2, 33 is prevented. In addition, guide rails 31a ′ are arranged at both ends of the frame member 10 to allow the moving frame member 10 to move.
The position is regulated in the width direction.

Also in the marking portion shown in FIG. 5B, similarly to the above, the receiving rail 31 'for supporting the lower portion of the frame material 10 and the product 11 and the guide rail for restricting the position of the frame material 10 in the width direction. 31a 'is arranged. In addition, in the marking portion, the laser oscillator 41
In order to irradiate the laser light 41a from the laser beam 41a to the correct position on the package surface of the product 11, the clearance between the guide rail 31a ′ and the frame material 10 is set at the brush portion (FIG.
The clearance is set to be narrower than that of the frame material 10 so that the displacement of the frame material 10 is more strictly limited.

Further, in the marking portion, a detection is performed to optically detect the conveyance timing of the product 11 depending on whether or not the moving product 11 blocks the light and notify the laser oscillator 41 of the emission trigger of the laser light 41a. A vessel 34 'is provided.

[0011]

However, such a marking device has the following problems.
That is, a pedestal and a guide rail for supporting the frame material being conveyed are arranged along the conveying direction of the frame material, and the marking portion and the two brushes are arranged along the conveying direction with reference to this. Since they are arranged, the entire marking device becomes large.

Further, in the guide rail for guiding the frame material being conveyed, the clearance between the guide rail and the frame material is set to be narrow so that the frame material is not displaced in the vertical and horizontal directions particularly at the marking portion. Films such as solder plating adhered to the surface of the material are peeled off, and the peeled solder plating etc. becomes dust and accumulates on the guide rails, which causes transport problems due to increased sliding resistance. There is.

Further, in the case of a product in which the package portion is extremely small, the marking area is also extremely small and the frame material needs to be positioned with high precision, but positioning with the guide rails does not provide sufficient precision, and the mark position may be displaced. It causes defects such as not being marked. This is particularly noticeable when the product is downsized and the position detection by the detector is defective, or when the frame material is deformed or undulated.

Therefore, it is an object of the present invention to provide a marking device which can be miniaturized and which can perform stable marking with high accuracy.

[0015]

SUMMARY OF THE INVENTION The present invention is a marking device designed to achieve the above object. That is, the present invention is a marking device that sequentially conveys a plurality of products formed along the longitudinal direction of a long frame material and marks the surface of the product at a predetermined position. And a pedestal part which is provided with a rotating wheel and which supports the frame material sent from the supply part along the outer periphery of the wheel while rotating the wheel, and a method of the outer periphery where the frame material of the wheel in the pedestal part contacts. And a marking portion for making a predetermined mark on the surface of the product arranged on the line and supported on the outer circumference of the wheel.

[0016]

In the present invention, the wheel in the pedestal rotates to support the frame material to be conveyed along its outer periphery. That is, the frame material is supported on the outer circumference of the wheel by a predetermined tensile force, and is conveyed as the wheel rotates. Therefore, the frame material required for marking can be supported on the curved surface, and the frame material can be conveyed without causing a speed difference between the moving frame material and the outer circumference of the wheel.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the marking device of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view for explaining an embodiment of a marking device of the present invention, FIG. 2 is an enlarged cross-sectional view for explaining main parts, and FIG. 3 is a view for explaining a frame material and a product. As shown in FIG. 1, the marking device 1 according to the present embodiment sequentially conveys a plurality of products 11 formed along the longitudinal direction of a long frame material 10, and a predetermined mark is formed on the surface of the product 11. Is attached.

The frame material 10 is composed of a lead frame as shown in FIG. 3A, and the product 11 is composed of a semiconductor device as shown in FIG. 3A. In the case of a lead frame, the frame material 10 includes a pair of frame portions 10a arranged substantially parallel to each other, and each frame portion 10a.
The lead portion 10b extends inward from a.

The product 11 has a structure in which elements (not shown) wired between the lead portions 10b are sealed with a mold resin. Note that positioning holes 10c are provided at predetermined intervals in the frame portion 10a to position the lead frame during the manufacturing process of the product 11, such as when the molding resin is used for sealing. In addition,
The positioning hole 10c is also used for carrying the lead frame.

In the marking device 1 of this embodiment,
Marks 11a (characters, marks showing polarity, etc.) as shown in FIG. 3B are attached to the surface of a plurality of products 11 formed along the longitudinal direction of the frame material 10. The products 11 with the marks 11a are cut and trimmed by the lead portions 10b of the frame material 10 shown in FIG. 3A to be individual products 11 as shown in FIG. 3B.

As a marking device 1 for performing such marking processing, for example, a supply unit 2 for sequentially sending out a long frame material 10 wound around a supply reel 21.
A pedestal part 3 for supporting the frame material 10 and the product 11 delivered from the supply part 2, and a predetermined surface with respect to the surface of the product 11 arranged above the pedestal part 3 and supported by the pedestal part 3. And a marking portion 4 for marking. The marking device 1 according to the present embodiment is characterized in that a rotating pedestal wheel 31 is used particularly in the pedestal portion 3 that supports the frame material 10 and the product 11.

In the marking device 1 of this embodiment, the frame material 1 sent from the supply reel 21 of the supply unit 2
0 is sent to the cradle wheel 31, which is a characteristic part, via the first buffer wheel 51, and is further sent from the cradle wheel 31 to the drive wheel 53 via the second buffer wheel 52. The two buffer wheels 51 and 52 have a structure capable of moving up and down according to the amount of slack of the frame material 10.

That is, when the rotation of the supply reel 21 is stopped and the pedestal wheel 31 is rotated at a constant speed while the first buffer wheel 51 is located below, the frame material 10 is conveyed. The first buffer wheel 51 is pulled up and moves upward. When the upper limit sensor 51a detects this upward movement, the supply reel 21 starts rotating. Also, the supply reel 21
The first buffer wheel 51 moves downward by the rotation of, and the rotation of the supply reel 21 is stopped when the lower limit sensor 51b detects this.

When the driving wheel 53 rotates while the second buffer wheel 52 is located below, the second buffer wheel 52 is pulled up and moves upward, which is detected by the upper limit sensor 52b. At that stage, the rotation of the drive wheel 53 is stopped. In addition, the pedestal wheel 3 with the drive wheel 53 stopped rotating
When the frame material 10 is sequentially conveyed from 1, the second buffer wheel 52 moves downward, and when the lower limit sensor 52b detects this, the rotation of the drive wheel 53 is started.

Thus, the two buffer wheels 5
By moving 1 and 52 up and down respectively, the frame material 10
A predetermined tensile force due to the weight of the two buffer wheels 51, 52 is accurately applied to the. That is, the frame material 10 is securely wound around a part of the outer periphery of the pedestal wheel 31 (approximately the upper half), and the pedestal wheel 3 is
The sheet is conveyed at the same speed as the rotation speed of 1.

The frame member 10 receives the laser beam 41a emitted from the laser oscillator 41 of the marking section 4 when it is conveyed in this way and is positioned above the pedestal wheel 31 in the pedestal section 3. As a result, the mark 11a as shown in FIG. 3B is attached to the surface of the product 11.

In the marking device 1 of this embodiment,
Since the frame material 10 is supported on the curved surface by the outer periphery of the pedestal wheel 31 in the pedestal portion 3, compared with the case of using the plate-shaped pedestal 31 'in the conventional marking device 1'as shown in FIG. The length of the entire device can be significantly reduced.

Further, the frame material 1 of the cradle wheel 31
Brushes 32 and 33 that come into contact with the surface of the product 11 to be conveyed are provided on the outer peripheral portion where 0 comes into contact. The brush 32, which is arranged on the transporting side of the irradiation position of the laser light 41a, removes dust adhering to the surface of the product 11 before marking with the laser light 41a, and is conveyed from the irradiation position of the laser light 41a. The brush 33 arranged on the lower side is the product 1 by the marking process with the laser beam 41a.
1 plays the role of removing the soot adhering to the surface.

Further, the marking device 1 in this embodiment
Then, the inspection camera 6 for detecting the suitability of the marking is arranged near the outer periphery of the pedestal wheel 31 (on the side of the brush 33 below the conveyance). In this way, the brushes 32 and 33, the marking unit 4, the inspection camera 6 and the like are arranged on the outer peripheral portion of the pedestal wheel 31 for performing various processes on the product 11, thereby achieving a large downsizing of the device. Will be able to.

Next, the main part of the marking device 1 of this embodiment will be described with reference to FIG. FIG. 2A is an enlarged cross-sectional view of the brush portion. That is, the brush 32,
33 is a pedestal wheel 3 rotated by the motor 30.
It is provided on the outer circumference of the unit 1 so that dust and soot can be removed by coming into contact with the surface of the products 11 that are successively conveyed.

Further, as shown in FIG. 2A, the frame material 10 to be conveyed is provided on the outer peripheral portion of the pedestal wheel 31.
Positioning pins 31 a for positioning the pedestal wheel 31 are provided. This positioning pin 31
a is the positioning hole 10 of the frame member 10 described above.
c (see FIG. 3 (a)) are provided at intervals so as to fit with each other. Thereby, when the frame material 10 to be conveyed is wound around the pedestal wheel 31, the positioning pin 31a and the positioning hole 10c are fitted to each other, and the frame material 10 is
While being positioned on the pedestal wheel 31, the pedestal wheel 31 can be reliably transported at the same speed as the rotation of the pedestal wheel 31.

That is, the brush 3 is applied to the surface of the product 11.
The frame member 10 is securely supported by the pedestal wheel 31 even when the pedestal wheels 3 and 2 contact each other.
Since there is no difference in speed from No. 1, the film such as solder plating adhered to the surface of the frame material 10 will not be peeled off. Further, the dust and soot removed by the brushes 32 and 33 are discharged to the outside by a suction mechanism (not shown), but are not discharged and the pedestal wheel 31 is not discharged.
Even if the pedestal wheel 31 has fallen to the upper side, the pedestal wheel 31 itself is rotating, so that the pedestal wheel 31 will eventually fall downward and will not adhere to the pedestal wheel 31.

A suction mechanism (not shown) is provided below the pedestal wheel 31 so that the dust dropped on the pedestal wheel 31 is forcibly sucked when it comes down. May not turn up again.

FIG. 2B is an enlarged sectional view of the marking portion. In the marking part, the pedestal wheel 3
The surface of the product 11 conveyed along the outer periphery of 1 is irradiated with a predetermined laser beam 41a, and a mark 11a as shown in FIG. That is, since the product 11 to be marked is sequentially transported to the marking portion as the frame material 10 is transported, the laser light 41
Accurate marking is performed on the surface of each product 11 by emitting a at the timing of this product conveyance.

In the marking device 1 of this embodiment,
In order to accurately detect the timing of the product conveyance, the detection plate 34 and the sensor 35 that rotate together with the pedestal wheel 31 are used. That is, the detection plate 34 is provided with a slit 34a that passes through the position of the sensor 35 in accordance with the intervals of the plurality of products 11 formed on the frame material 10, and the light passing through the slit 34a is detected by the sensor 35. The timing of product transportation is detected by detecting with.

The sensor 35 sends a predetermined signal to the laser oscillator 41 (see FIG. 1) at the stage when the position of the slit 34a is detected, and emits the laser beam 41a based on this signal. Further, the cradle wheel 31 is provided with the positioning pin 31a described above, and the frame member 1
Since accurate positioning is performed by fitting with the positioning hole 10c of 0 (see FIG. 3A), the sensor 35
By emitting the laser light 41a based on the signal from
The mark 11a (see FIG. 3B) can be accurately attached to the accurate position on the surface of the product 11.

In this way, when the slits 34a provided in the detection plate 34 are detected to detect the product transport timing, the position of the transported product 11 is directly detected to detect the product transport timing. Compared with, it becomes possible to perform reliable detection without depending on the size of the product 11. That is, when the size of the product 11 is reduced or the package is made thin, it is very difficult to directly detect the position, and a detection failure is likely to occur. On the other hand, the slit 3 provided in the detection plate 34
When detecting 4a, it becomes possible to reliably detect the timing of product transportation without depending on the size of the product 11.

That is, in the marking device 1 of this embodiment, the frame material 10 is accurately conveyed along the outer periphery of the rotating pedestal wheel 31, so that the detection plate 34 synchronized with the rotation of the pedestal wheel 31 is provided. By providing the product, the timing of product transportation can be detected easily and accurately, and even if the package portion of the product 11 is extremely small and the marking area is extremely small, the mark 11a (Fig. 3 (b)).

In this embodiment, the detection plate 34 is provided with the slit 34a and the sensor 35 detects it. However, the slit 34a is not always necessary and the slit 34a may be used instead of the reflection. It is also possible to use a detection means that is provided with a mark, a magnetic mark, or the like, and detects reflected light or magnetism with the sensor 35 to detect the timing of product transportation.

Further, in the present embodiment, the marking portion 4 for marking the surface of the product 11 with the mark 11a (see FIG. 3B) by utilizing the laser beam 41a emitted from the laser oscillator 41.
However, the present invention is not limited to this, and a marking device including another type of marking portion 4 such as a predetermined ink is ejected to make a mark. The same applies even if it is 1.

[0041]

As described above, the marking device of the present invention has the following effects. That is, in the present invention, since the pedestal wheel is used for the pedestal portion that supports the frame material, it is possible to support the frame material on a curved surface, which is significantly smaller than the case where it is supported on a flat surface. Can be realized.

Further, since the frame material is wound around the outer periphery of the pedestal wheel and conveyed along with the rotation of the pedestal wheel, it is possible to prevent the solder plating from peeling off due to the contact between the frame material and the pedestal wheel, and to secure the frame material. It is possible to realize accurate positioning and conveyance and marking processing to an accurate position.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating an embodiment of a marking device of the present invention.

FIG. 2 is an enlarged cross-sectional view for explaining a main part of the marking device, in which (a) shows a brush portion and (b) shows a marking portion.

FIG. 3 is a diagram illustrating a frame material and a product, (a)
Shows an overall view, and (b) shows a state after trimming.

FIG. 4 is a schematic diagram illustrating a conventional example.

FIG. 5 is an enlarged cross-sectional view illustrating a main part of a conventional example,
(A) shows a brush part, (b) shows a marking part.

[Explanation of symbols]

 1 Marking device 2 Supply unit 3 Pedestal unit 4 Marking unit 6 Inspection camera 10 Frame material 11 Product 21 Supply reel 31 Cradle wheel 31a Positioning pins 32, 33 Brush 34 Detection plate 41 Laser oscillator 51, 52 Buffer wheel

Claims (5)

[Claims] 1. A marking device for sequentially transporting a plurality of products formed along a longitudinal direction of a long frame material and marking the surface of the product at a predetermined position, wherein the frame materials are sequentially arranged. A supply part for sending out, and a rotating wheel, and a pedestal part for sending while supporting the frame material sent out from the supply part along the outer periphery of the wheel with rotation of the wheel, and the frame material of the wheel in the pedestal part A marking device, comprising: a marking portion arranged on a normal line of an outer circumference that comes into contact with the surface of a product supported by the outer circumference of the wheel. 2. The marking device according to claim 1, wherein a brush that is in contact with the surface of the product being conveyed is provided on an outer peripheral portion of the wheel that is in contact with the frame material. 3. The marking device according to claim 1, wherein a positioning pin that fits into a positioning hole provided in the frame member is provided on an outer peripheral portion of the wheel. 4. The marking device according to claim 1, further comprising a detection unit that rotates together with the wheel to detect a conveyance timing of the product. 5. A brush that is provided on an outer peripheral portion of the wheel that comes into contact with the frame member and that comes into contact with the surface of the product, and a positioning hole that is provided on the outer peripheral portion of the wheel and that is provided in the frame member. The marking device according to claim 1, further comprising: a positioning pin that matches with the positioning pin; and a detection unit that rotates together with the wheel to detect a conveyance timing of the product.