JP2009071108A - Two-lid picking-up sensor and use thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a plurality of lids from being mounted on one envelope one over another in a seam bonding device. <P>SOLUTION: The seam bonding device which mounts a lid on an opening portion of the envelope containing an electronic component and seam-bonding the envelope and lid together to seal the opening portion includes a suction nozzle which suctionally holds and conveys the lid, a stage on which the lid sucked by the suction nozzle is temporarily mounted before being mounted on the envelope, a suction nozzle holding mechanism which lowers the suction nozzle when mounting the lid on the stage and carries on the lowering operation further by a predetermined distance even after a tip of the suction nozzle sucking the lid abuts against a top surface of the stage with the lid interposed, and a measuring instrument which measures the quantity of a relative position shift between the suction nozzle holding mechanism and suction nozzle and judging one or plural of lids based on the measuring result. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a package sealing device in which a lid, which is a metal lid plate, is joined to an opening of an envelope containing electronic components such as a crystal resonator and a surface acoustic wave filter.

  Conventionally, products in which electronic parts such as a crystal resonator and a surface acoustic wave filter are hermetically sealed with a package are widely known. FIG. 5 is a cross-sectional view of a package 51 taken up as an example of a conventional package. First, a package in which a seal ring 53 is brazed to the periphery of the opening of a ceramic envelope 52 is prepared. An electronic component 54 such as a crystal resonator is accommodated in the envelope 52, and the electronic component 54 is electrically connected to the outer lead 56 by a wire 55. A lid 57 that is a metal lid is positioned and placed in the opening of the envelope 52 through the seal ring 53.

  Then, a pair of tapered roller electrodes 58a and 58b are brought into contact with two opposite ends of the lid 57, for example, two long sides, under a predetermined pressure (FIG. 6A). In this state, the package 51 is moved in the direction of arrow A together with the work table 60, and at the same time, pulsation energization is performed between the roller electrodes 58a and 58b, and the long side of the lid 57 is seamed to the seal ring 53 by Joule heat generated at this time. Join.

  When the long-side seam welding is completed in this way, the roller electrodes 58a and 58b are once moved upward to adjust the electrode interval, and the package 51 is rotated by 90 ° in the horizontal plane as shown in FIG. 6B. . Thereafter, the roller electrodes 58a and 58b are lowered again, and the other two opposite sides, that is, the short sides are similarly seam-joined, and the package in which the chip 54 is sealed is completed.

  In the production line, in consideration of work efficiency, as shown in FIG. 7, a large number of packages 51 are aligned on a tray 59, and this tray 59 is placed on a stage that can move in the horizontal direction. Perform the joining work. In this case, after performing seam joining (hereinafter referred to as X direction seam) on one opposite two sides to the total number of packages on the tray 59, the tray 59 is then moved onto another stage. On another stage, a method of performing seam joining (hereinafter referred to as Y direction seam) of the other two opposite sides to the total number of packages on the tray 59 is widely adopted.

  Next, the overall operation of such a joining apparatus will be described with reference to FIG. In FIG. 8, reference numeral 60 denotes an X direction seam stage, and 61 denotes a Y direction seam stage. Reference numeral 62 denotes an X-direction welding head in which the mounting direction of the roller electrode is fixed for the X direction, and 63 denotes a Y-direction welding head in which the roller electrode is fixed for the Y direction. Reference numeral 64 denotes a temporary fixing stage, and spot welding is performed on the temporary fixing stage 64 so as not to cause a positional shift between the envelope and the lid before entering the seam joining process. In FIG. 8, an arrow B indicates the conveyance direction of the tray 59.

  Reference numeral 65 in FIG. 8 denotes a rotary support, which has two arms extending to the upper side. The two arms open at an angle of 90 ° and extend in the horizontal direction, and have a first pickup head 66 and a second pickup head 67 at their respective tips. When the rotary support 65 reciprocates at an angle of 90 °, the first pickup head 66 reciprocates between the lid supply stage 68 and the positioning stage 69, and at the same time, the second pickup tool moves between the positioning stage 69 and Reciprocate between the temporary fixing stage 64.

  Next, the temporary fixing process by spot welding will be described. First, the tray 59 on which the package in a state before the lid is placed is placed on the temporary fixing stage 64. Then, the first pickup head 66 sucks and holds the lids of the lid supply stage 68 one by one using the vacuum suction nozzle, and transports them to the next positioning stage 69. Here, the first pick-up head 66 places the lid held by suction on the positioning stage, and then releases the lid from the suction nozzle. In the meantime, the positioning stage 69 corrects by pressing the side surface (thickness surface, not the main surface) of the lid so that the lid is placed at a desired position on the positioning stage 69.

  Next, the second pickup head 67 is a suction nozzle, holds the lid whose position has already been corrected on the positioning stage, and places the lid on an envelope on the tray 59 placed on the temporary fixing stage 64. To do. When the lids are placed on all the envelopes on the tray 59 in this way, the temporary fixing welding head 70 starts spot welding. This spot welding is performed by performing a total of a pair of spot weldings, one place at approximately the center of each of the two opposing sides of the placed lid. Usually, this spot welding is performed by causing a pair of roller electrodes, such as those used in seam welding, to come into contact with the lid and let the current flow in a stationary state without rolling.

  In this way, the first pickup head 66 sucks and holds the lids of the lid supply stage 68 one by one by the suction nozzle provided therein, and generally the lid shape has a thickness of about 0. Because it is a rectangular flat plate with a side of several millimeters with a side of 1 mm, the suction nozzle should hold only the uppermost one, but the lid that is directly beneath it will be in close contact, and multiple sheets will be transported as they are There is. Therefore, Patent Document 1 discloses a technique in which air is blown from the side where the suction nozzle is lifted slightly by sucking the lid, and the extra attached lid is removed by the wind force. In addition, an attempt has been made to place an adsorption nozzle that adsorbs and holds a lid above the magnet, and to peel off the excess lid downward by the magnetic force.

JP-A-8-225160 (5th page, FIG. 6, FIG. 7)

  However, in general, the lid is a flat plate with a smooth surface, which is obtained by plating a metal such as Kovar. Since the thickness is 0.1 mm, the mass of one piece is very small. Therefore, even if a mechanism for removing excess lids by air blow method or magnetic force method is incorporated, it is not 100% removed. In mass production, packages with a plurality of lids are occasionally mixed, and temporary It will flow after the stopping process.

  Also, as shown in FIG. 8, these seam joining processes are often sealed around the booth 71 and filled with an inert gas inside. It takes time to collect the small lid that has fallen, causing a loss of line stoppage. Moreover, it does not have to be dropped and recovered, and depending on the state of the extra lid, the seam joining device may be damaged.

As a first aspect, the present invention provides a seam joint that seals the opening by placing a lid on the opening of the envelope that houses the electronic component and seam-bonding the envelope and the lid. In the apparatus, there is provided a two-sheet lid picking sensor for preventing a plurality of lids from being placed on one envelope, and a suction nozzle for sucking and holding the lid, and the suction nozzle A stage on which the lid is temporarily placed before the lid sucked on the envelope is placed on the envelope, and the tip of the suction nozzle that sucks the lid by lowering the suction nozzle when placing the lid on the stage The suction nozzle holding mechanism that continues the lowering operation for a predetermined distance even if it contacts the upper surface of the stage via this lid, and measures the relative positional deviation between the suction nozzle holding mechanism and the suction nozzle Do And measuring device, the lid from the measurement result of the measuring instrument provides a lid two-up sensor, characterized in that a control unit for determining whether a plurality or a one.

According to a second aspect of the present invention, as the second aspect, the stage is a positioning stage that corrects the position of the lid so that the tip of the suction nozzle comes into contact with the desired position of the lid and sucks it. Provided is a lid two-sheet pick sensor described as an aspect.

Further, according to a third aspect of the present invention, the measuring instrument is a proximity sensor, and the control unit compares a preset threshold value with an output value of the proximity sensor, so that one or more lids are provided. The lid two-sheet picking sensor according to any one of the first and second aspects is provided.

Further, according to a fourth aspect of the present invention, there is provided a seam that seals the opening by placing a lid on the opening of the envelope housing the electronic component and seam-joining the envelope and the lid. In a bonding apparatus, a method of using a lid two-sheet picking sensor for preventing a plurality of lids from being stacked on one envelope, wherein a) suction is performed by sucking and holding the lid The lid adsorbed on the stage by the nozzle is placed, and an output value of a measuring instrument for measuring a distance including information on the thickness of the placed lid is compared with a preset threshold value. b) When the result of the comparison is a result that there are a plurality of lids, the operator is urged to adjust the threshold value. When the result is that the lid is one, the lid on the stage is again used by the suction nozzle. The lid is placed on top of each other, and the output value of the measuring instrument is compared with the threshold value again. c) If the result of the comparison again is a result of one lid, the operator is prompted to adjust the threshold value, and if the result is that there are a plurality of lids, the adjustment mode is terminated. Provided is a method for using a lid two-sheet picking sensor characterized in that an actual operation for seam joining is performed through an adjustment mode in which the above steps are sequentially performed.

  According to the present invention, it is possible to detect a case where a plurality of lids, which should be one sheet, are overlapped at a stage before the lid is placed on the envelope. Therefore, one lid can be supplied to one envelope more reliably than the method of preventing two lids from being removed by physical means at the stage of picking up the lid from the lid supply unit. In addition, an adjustment mode for the two-sheet lid sensor is provided before the actual seam joining operation, and the threshold value is adjusted (confirmed) by actually measuring one lid and measuring two lids in succession. Therefore, it is possible to realize the adjustment of the lid two-sheet taking sensor reliably in a short time.

  Next, an embodiment of a lid two-sheet picking sensor and a method of using the same according to the present invention will be described in detail with reference to the accompanying drawings.

  As an embodiment, the case where the present invention is applied to a general seam joining device described based on FIG. 8 in the description of the prior art will be described. As an embodiment of the present invention, the pickup head denoted by reference numeral 66 in FIG. A side view of the pickup head according to the present invention is shown in FIG.

  In FIG. 1, the rotary support 65, the first pickup head 66, and the positioning stage 69 correspond to the reference numerals 65, 66, and 69 in FIG. The first pick-up head 66 is fixed to the tip of the arm 1 projecting sideways from the upper part of the rotary column 65. The motor 3 is on the right side of the L-shaped base 2 in side view, and the base is on the left side. 2 is provided with an eccentric 4 that is pivotally attached to the shaft of a motor 3 that passes through the shaft 2 rotatably. The first slide rail 5 is fixed to the left side surface of the base 2, and the first slide block 6 fitted to the first slide rail 6 and the first elevating block 7 fixed thereto are attached to the base 2. It is held up and down freely.

  Further, a second slide rail 8 is fixed to the left side surface of the first elevating block 7, and a second slide block 9 fitted therein and a second elevating block 10 fixed thereto are first. The lift block 7 is held up and down freely. Further, the suction nozzle 11 is fixed to the left side surface of the second elevating block 10, and the working end 11 a at the lower end thereof is in contact with the lid to perform suction. An exhaust tube 12 is connected to the upper end of the suction nozzle, and the other end is connected to an exhaust means (not shown) to generate a suction force at the working end 11a.

  Further, a pin 13 is projected on the left side surface of the base 2, and a first tension coil spring 14 is suspended between the vicinity of the tip and the first lifting block 7. In addition, since the cam follower 15 is provided on the right side surface of the first elevating block 7, the first elevating block 7 lifted upward by the first tension coil spring 14 includes the cam follower 15, the eccentric wheel 4, and the like. As the motor 3 rotates, it moves up and down.

  When the first elevating block 7 is lowered by the rotation of the motor 3, the suction nozzle 11 is also lowered. However, when the working end 11a of the suction nozzle 11 comes into contact with another stationary object, the suction nozzle The lowering of the second elevating block 10 fixing 11 is stopped, and only the first elevating block 7 is lowered. At this time, the second tension coil spring 16 suspended between the upper part of the second elevating block having the L shape in side view and the upper part of the first elevating block 7 extends, and the second elevating block 10 having the L shape extends. The proximity sensor 17 that has been in contact with the lower surface of the projecting portion in the horizontal direction is separated from the lower surface.

  On the other hand, the positioning stage 69 is provided with a mounting surface 18 on which the lid is mounted substantially in the center of the upper surface, and horizontally from four pushers 19 (only two on the left and right are shown in the figure) provided on the four sides thereof. The positioning piece 19a entering and exiting presses the lid from the lateral direction, thereby positioning the lid. Further, a suction port 18a having a diameter smaller than that of the lid is formed in the mounting surface 18, and an exhaust tube 20 is connected to the lower end thereof. The other end is connected to an exhaust means (not shown), and the lid placed on the suction port 18a is adsorbed onto the placement surface 18.

  The exhaust tube 12 connected to the suction nozzle 11 and the exhaust tube 20 connected to the suction port 18a of the positioning stage 69 are each provided with a pressure detector before reaching exhaust means (not shown). Here, one pressure detector is a first lid adsorption detector 21 that detects whether or not the adsorption nozzle 11 is adsorbing and holding a lid, and the other pressure detector is a suction port provided in the positioning stage 69. 18a is a second lid adsorption detector 22 for detecting whether or not the lid is adsorbed. Further, adjacent to the positioning stage 69, there is provided a lid discarding box 23 for discarding the lid that has been once mounted on the positioning stage 69 but is not used in the subsequent seam joining process.

  Next, the operation of the pickup head 66 above the positioning stage 69 will be described with reference to FIGS. First, FIG. 2 shows a state in which the pickup head 66 sucks and holds the lid 57 from the lid supply stage 68 shown in FIG. 8 and is positioned above the positioning stage 69 by the rotation of the rotary column 65 in this state. Here, the eccentric wheel 4 is maintained at a rotation angle such that the first elevating block 7 is positioned at the uppermost part. In addition, since the second lifting block 10 has the suction nozzle working end 11a sucking and holding the lid 57 and is not in contact with a stationary object, the second lifting block 10 has a lower end with respect to the first lifting block 7 as a reference. The upper end of the proximity sensor 17 is in contact with the protruding portion of the second lifting block 10.

  Furthermore, the first lid adsorption detector 21 detects a pressure drop in the exhaust tube 12 due to the adsorption nozzle 11 adsorbing the lid 57, and indicates that the adsorption nozzle 11 is in a state of adsorbing and holding the lid 57. The signal shown is output to a control unit (not shown). The second lid adsorption detector 22 is in a state where the lid 57 is not placed on the suction port 18a because the pressure drop in the exhaust tube 20 due to the suction port 18a adsorbing the lid 57 is not detected. A signal indicating this is output to a control unit (not shown).

  Next, as shown in FIG. 3, when the motor 3 rotates by a predetermined angle, the eccentric wheel 4 pivotally attached to the shaft rotates, and the first lifting block 7 together with the cam follower 15 that is in rolling contact with the eccentric wheel 4. Descend. Further, the second elevating block 10 positioned at the lowermost end with respect to the first elevating block 7 is also lowered by the tension coil spring 16, but the lid 57 adsorbed to the adsorption nozzle 11 is mounted on the positioning stage 69. When coming into contact with the placement surface 18, the descent is stopped. As a result, the tension coil 16 extends, and at the same time, a gap L is formed between the upper end of the proximity sensor 17 and the protruding portion of the second lifting block 10.

  At this time, since the first elevating block 7 is lowered by a predetermined distance that can be reproduced by the motor 3, the gap L is placed at a distance when the working end 11a of the suction nozzle directly contacts the placement surface 18. 18 is a value obtained by adding the thickness of the lid placed on 18. Therefore, if the value of the thickness of the lid 57 is known, it can be determined whether the number of the mounted lids 57 is one or plural. Alternatively, even if the thickness value of the lid 57 is not known, it is possible to easily determine whether the number of the lid 57 is one or more by performing an adjustment operation described later.

For example, if the gap above the proximity sensor 17 when the working end 11a of the suction nozzle directly contacts the mounting surface 18 is Mmm and the thickness of one lid is 0.1 mm, the threshold value of the output from the proximity sensor 17 Is set to M + 0.15 mm, if the output, that is, the distance of the gap L is less than this threshold value, the placed lid 57 is one sheet, and if the output is more than this threshold value, the placed lid 57 is a plurality of sheets. It will be. Such comparison and determination between the output of the proximity sensor 17 and the threshold value are performed by a control unit (not shown) provided in the seam joining apparatus. Furthermore, at the time of this determination, if the controller recognizes that the suction of the suction nozzle 11 is continued and the output of the first lid suction detector 21 is being suctioned, it is placed. The number of lids 57 is not zero.

Whether or not a lid exists on the positioning stage 69 can be determined by checking the output of the second lid suction detector 22 while sucking air from the suction port 18a of the positioning stage 69. Therefore, as described above, the lid is already present on the positioning stage 69 when there is a plurality of lids as a result of confirming that there is one lid, or before such confirmation is started. In this case, the lid on the positioning stage 69 is sucked and held by the pickup head 66, and the unnecessary lid is discarded in the above-described disposal box 23 so that the lid does not exist on the positioning stage 69.

  As described above, the mechanism for detecting whether the lid placed on the positioning stage 69 is one sheet or a plurality of sheets and the operation thereof have been described, and the entire function has been described as a two-lid picking sensor. Needless to say, it is not to detect that there are two sheets but to determine whether one or more sheets. And next, the usage method of this lid 2 piece taking sensor is described. Even if it is said to be a method of use, if the threshold value is set correctly, there is no element that the operator directly operates on the lid two-sheet picking sensor in the flow of joining work. Accordingly, the adjustment method of the lid two-sheet picking sensor corresponding to the thickness of the lid that changes for each product to be seam-bonded or when the adjustment at the time of starting the apparatus is used.

  FIG. 4 is a flowchart showing a method for adjusting the lid two-sheet picking sensor. Step 101 indicates the start of the lid two-sheet taking sensor adjustment mode. In some cases, this adjustment mode is started by an operator's operation, or this adjustment mode is automatically started in a sequence when the apparatus is started. Next, as described above, step 102 detects whether or not there is a lid on the positioning stage 69, and if there is an unnecessary lid, the pickup head 66 sucks and holds the lid as described above to the waste box 23. Transport. The lid is discharged until the lid is no longer on the positioning stage 69 (step 103).

  Next, if it is determined that there is no lid on the positioning stage 69, in step 104, the pickup head 66 is operated to transport the lid 57 from the lid supply stage 68 to the positioning stage 69. In step 105, when the lid 57 attracted and held by the pickup head 66 is placed on the positioning stage 69, it is determined whether the output of the proximity sensor 17 is less than the threshold value or more than the threshold value as described above. If this is greater than or equal to the threshold value, it is determined that the threshold setting is inappropriate (the threshold value is too low), and an operator call is displayed on the apparatus to prompt adjustment of the threshold value (step 106).

  On the other hand, if the output of the proximity sensor 17 is less than the threshold value, in step 107, the pickup head 66 is operated again to transport the lid 57 from the lid supply stage 68 to the positioning stage 69, which has already been placed. Place it on the lid. In step 108, it is determined again whether the output of the proximity sensor 17 is less than the threshold value or more. At this time, if the output of the proximity sensor 17 is less than the threshold value, it is recognized that there is one for the plurality of lids 57, and therefore the threshold setting is inappropriate (the threshold is too high). Judgment is made and an operator call is displayed on the apparatus to prompt adjustment of the threshold value (step 106).

  If the output of the proximity sensor 17 is equal to or greater than the threshold value, the determination of whether the lid 57 on the positioning stage 69 is one or two is correctly performed. It is determined that it is appropriate, and a message is displayed on the apparatus indicating that the adjustment of the double lid picking sensor is good (step 109). Then, the adjustment mode of the lid two-sheet taking sensor is terminated (step 110).

  After the adjustment as described above is performed, the actual work is started, so that the function of the lid two-sheet picking sensor can be reliably utilized. In addition, by programming a series of adjustment operations and determinations shown in the flowchart of FIG. 4 in the seam joining device, the operator can easily perform this adjustment operation.

Side view showing an embodiment of the present invention Side view showing an embodiment of the present invention Side view showing an embodiment of the present invention The flowchart which shows embodiment of this invention Sectional view showing conventional technology Plan view showing conventional technology Plan view showing conventional technology Plan view showing conventional technology

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Arm 2 Base 3 Motor 4 Eccentric wheel 5, 8 Slide rail 6, 9 Slide block 7 1st raising / lowering block 10 2nd raising / lowering block 11 Adsorption nozzle 12, 20 Exhaust tube 13 Pin 14 1st tension coil spring 15 Cam follower 16 Second tension coil spring 17 Proximity sensor 18 Mounting surface 19 Pusher
21 First lid adsorption detector 22 Second lid adsorption detector 23 Waste box

Claims (4)

In a seam joining apparatus that seals the opening by placing a lid in an opening of an envelope that houses electronic components, and seam-joining the envelope and the lid, a single envelope A lid 2-pickup sensor for preventing a plurality of lids from being stacked and placed;
A suction nozzle for sucking and holding the lid, a stage for temporarily placing the lid before the lid sucked by the suction nozzle is placed on the envelope, and when placing the lid on the stage The suction nozzle holding mechanism that lowers the suction nozzle and continues the lowering operation for a predetermined distance even when the tip of the suction nozzle that sucks the lid contacts the upper surface of the stage via the lid, and the suction nozzle holding mechanism And a measuring device that measures the amount of relative displacement between the suction nozzle and a control unit that determines whether the lid is one or more from the measurement result of the measuring device. A lid two-sheet pick-up sensor. 2. The lid two-sheet picking sensor according to claim 1, wherein the stage is a positioning stage that corrects the position of the lid so that the tip of the suction nozzle comes into contact with and sucks a desired position of the lid. The measuring instrument is a proximity sensor, and the control unit compares a preset threshold value with an output value of the proximity sensor to determine whether the number of lids is one or more. The lid two-sheet picking sensor according to any one of claims 1 and 2. In a seam joining apparatus that seals the opening by placing a lid in an opening of an envelope that houses electronic components, and seam-joining the envelope and the lid, a single envelope A method of using a lid two-sheet picking sensor for preventing a plurality of lids from being stacked and placed,
a) An output value of a measuring instrument that measures the distance including information on the thickness of the lid placed on the stage by the suction nozzle that sucks and holds the lid and transports the lid, and a preset threshold value And compare.
b) When the result of the comparison is a result that there are a plurality of lids, the operator is urged to adjust the threshold value. When the result is that the lid is one, the lid on the stage is again used by the suction nozzle. The lid is placed on top of each other, and the output value of the measuring instrument is compared with the threshold value again.
c) If the result of the comparison again is a result of one lid, the operator is prompted to adjust the threshold value, and if the result is that there are a plurality of lids, the adjustment mode is terminated.
A method for using a lid two-sheet pick-up sensor, wherein an actual operation for seam joining is performed through an adjustment mode in which the above steps are sequentially performed.

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