JP4105056B2 - Electronic unit inspection device - Google Patents

Description

  The present invention relates to an inspection device for inspecting whether or not an electronic unit such as a control device for controlling various devices normally operates at the time of factory shipment.

  A printed wiring board on which various electronic components are mounted is used for the electronic unit. In order to protect this printed wiring board from moisture, water, insects and the like for many years, for example, a technique called potting is employed (see Patent Document 1). This potting is to shut off the outside air by burying the printed wiring board in the resin. In a state where the printed wiring board is stored in the storage case, a potting resin before curing is injected into the storage case, and when each electronic component is buried in the resin, the resin is left to be cured in that state.

  On the other hand, a reference hole is formed in the printed wiring board for positioning when electronic parts are mounted by a machine. This reference hole is used when storing the printed wiring board. That is, a positioning protrusion is formed on the bottom of the storage case, and when the printed wiring board is stored in the storage case, the protrusion is inserted into the reference hole so that the The printed wiring board is in a certain posture.

  By the way, since it is necessary for the printed wiring board to receive data input / output from outside and supply of power, a connector may be directly mounted on the printed wiring board. Thus, when the connector is mounted on the printed wiring board, the filling amount of the potting resin is set so that the connector is not buried in the potting resin but exposed on the potting resin. In addition to the connectors, tall electronic components such as relays may be attached to the printed wiring board. In this case, a large amount of potting resin is required to completely embed such a tall component, so that a tall electronic component may be exposed from the potting resin.

  By the way, when the potting resin is cured, the electronic unit is completed. However, it is necessary to test whether or not the electronic unit operates normally at the final stage of the electronic unit production line. Although it is only necessary to check that the electronic unit is actually operated by actually incorporating the electronic unit into the device, the method of actually incorporating the electronic unit into the device requires too much man-hours and cannot be adopted.

Therefore, a test is performed by connecting a test device to a terminal in the connector and simulating the electronic unit in the same operating state. However, even in this test method, since it takes time to attach and detach the connector by manually inserting and connecting the connector to each connector, this test head is used with a test head having probe pins corresponding to the terminals of each connector. It is known that the test is performed by bringing the probe pin into contact with each terminal simultaneously with the connector relatively close to the connector (Patent Document 2).
JP 2002-134931 A (see FIG. 5) Japanese Patent Laid-Open No. 5-273300 No. 0 (see FIG. 1)

  In the method using the test head described in Patent Document 2, unless the position of the printed wiring board is accurately positioned with respect to the test head, there is a problem that all the probe pins do not contact each terminal accurately. . On the other hand, since the printed wiring board is buried in the potting resin, the printed wiring board cannot be directly gripped or positioned using the reference hole.

  Therefore, the printed wiring board has to be positioned indirectly by positioning the storage case. However, since the storage case is manufactured by resin injection molding, the amount of expansion and contraction is large, and distortion is easily caused when internal stress is generated during injection molding. Therefore, it is designed so that the protrusion can be inserted into the reference hole of the printed wiring board. For this reason, when the printed wiring board is stored in the storage case, the printed wiring board cannot be accurately positioned particularly with respect to the outer peripheral surface of the storage case. Therefore, there arises a problem that the printed wiring board cannot be accurately positioned even if the storage case is positioned.

  Therefore, in view of the above problems, the present invention provides an electronic unit inspection apparatus capable of accurately positioning a printed wiring board with respect to a test head even if the printed wiring board is an potted electronic unit. Is an issue.

  In order to solve the above-described problems, an electronic unit inspection apparatus according to the present invention provides a printed wiring to a storage case by a reference hole provided in a printed wiring board having a connector and a positioning protrusion protruding from the bottom of the storage case. In the inspection device that inspects the potted electronic unit by storing the printed wiring board in the storage case with the board positioned, and injecting a quantity of resin that does not embed the connector into the storage case, it is a test that can move forward and backward with respect to the connector A probe pin that contacts the terminal in the connector at the measurement position where the test head is close to the connector is provided on the test head, and the probe pin contacts the connector before contacting the terminal so that the printed wiring board is properly Positioning means to correct the posture of the electronic unit so that it is in the position of And wherein the door.

  The present invention is characterized in that the printed wiring board is positioned with reference to a connector attached to the printed wiring board. The connector is attached by inserting a lead wire portion into a through hole having a diameter of about 0.5 mm provided on the printed wiring board. Therefore, the variation in the mounting position of the connector with respect to the printed wiring board is a value far below 0.1 mm. Therefore, when the connector is positioned as a reference, the printed wiring board can be positioned with high accuracy.

  By the way, when a plurality of connectors are provided on the printed wiring board, the distance between the positioning reference positions is determined by using at least two connectors facing each other on the diagonal of the printed wiring board as the positioning reference. As a result, the printed wiring board can be positioned with higher accuracy.

  In addition, electronic components that serve as positioning standards are not limited to connectors. For example, the printed wiring board includes relays and other components that are not embedded in potting resin, like connectors. In addition to the connector, this electronic component may be used as a positioning reference.

  Generally, a connector attached to a printed wiring board is inserted into a pair of connectors so that the internal terminals are connected to each other. However, in the test head, only the probe pin enters the connector and contacts the terminal. To do. Therefore, when a member other than the probe pin enters the connector, it may interfere with the contact between the probe pin and the terminal. Therefore, the positioning means does not interfere with the contact between the probe pin and the terminal if the outer peripheral portion of the connector is used as a positioning reference.

  When the position of the printed wiring board is corrected for the positioning means, the entire electronic unit moves and the posture is corrected. At that time, the frictional force between the base on which the electronic unit is placed and the electronic unit interferes with the movement of the electronic unit. Therefore, if a large number of pores are opened on the base on which the electronic unit is placed, and the positioning means positions the electronic unit, air is ejected from the pores, so that the electronic unit and the base Thus, the electronic unit can move smoothly.

  As is clear from the above description, the present invention positions the printed wiring board with reference to the connector directly mounted on the board, so that the case is based on the storage case in which the printed wiring board is stored. The printed wiring board can be positioned with much higher accuracy, and the probe pins of the test head and the terminals of the connector can be reliably brought into contact with each other.

  Referring to FIG. 1, reference numeral 1 denotes an embodiment of an inspection apparatus according to the present invention. The inspection apparatus 1 is provided with a plate-like test head 2 that is moved up and down by a cylinder 11. The test head 2 is guided to move in the vertical direction by a pair of guide bars 12, and is set to move up and down vertically with respect to the horizontal base 3.

  A plurality of probe pins 21 are attached to the lower surface of the test head 2. The probe pin 21 has a two-stage telescopic structure, and is composed of a fixed portion fixed to the lower surface of the test head 2 and a forward / backward tip portion urged downward from the fixed portion. Yes. Accordingly, when the test head 2 is lowered while the electronic unit 4 is placed on the base 3, the tip of the probe pin 21 comes into contact with the terminal in the connector 61 of the electronic unit 4, and the test head is further increased from this state. When 2 is lowered, the tip portion is retracted toward the fixed portion, and the probe pin and the terminal can be kept in contact with each other with an appropriate stress.

  The electronic unit 4 includes a bottomed storage case 5 and a printed wiring board 6 that is stored in the storage case 5 so as to be in a substantially horizontal state, and is filled with a potting resin 51 while the printed wiring board 6 is stored. Has been. In addition to the connector 61, other electronic components such as a relay 62 are also mounted on the printed wiring board 6. The potting resin 51 is filled until the other short electronic components mounted on the printed wiring board 6 are completely buried, but it is necessary to connect a connector attached to the tip of an external harness to the connector 61. Therefore, the connector 61 is filled so as not to be buried. Further, since the relay 62 is also tall, the upper portion is exposed above the potting resin 51 without being completely buried in the potting resin 51.

  Referring to FIGS. 2 and 3, a positioning block 7 as a positioning means is fixed to the lower surface of the test head 2 in addition to the probe pin 21. The positioning block 7 is formed in an L shape, and two positioning portions 71 are formed in contact with two adjacent outer peripheral surfaces of the outer peripheral surface of the connector 61. A chamfered portion 72 is formed inside the distal ends of the positioning portions 71.

  Therefore, when the test head 2 is lowered, the chamfered portion 72 comes into contact with the upper end edge of the connector 61, and when the test head 2 is further lowered, the connector 61 moves in the horizontal direction while coming into contact with the chamfered portion 72, thereby In the block 7, the two connectors 61 positioned substantially on the diagonal line of the printed wiring board 6 are positioned by being sandwiched from outside the diagonal line.

  In the above-described embodiment, positioning is performed based on the two connectors 61, but the relay 62 may be used for positioning.

  By the way, the printed wiring board 6 is formed with a reference hole 63 serving as a reference for mounting an electronic component, and the protrusion 52 projecting from the bottom of the storage case 5 is inserted into the reference hole 63. Thus, the printed wiring board 6 is positioned with respect to the storage case 5. However, since the deformation amount of the storage case 5 is relatively large, the backlash is set from the beginning so that a slight gap is generated between the reference hole 63 and the protrusion 52.

  However, in the present invention, since the positioning is performed with reference to the connector 61 mounted on the printed wiring board 6, the probe pin 21 can be brought into contact with the terminal of the connector 61 while being accurately positioned by the positioning block 7.

  By the way, since the chamfered portion 72 of the positioning block pushes the upper edge of the connector 61 to move the entire electronic unit 4 horizontally, it is desirable that the coefficient of friction between the storage case 5 and the base 3 is small.

  Therefore, in this embodiment, the cover 31 is attached to the lower surface of the base 3 to form the air passage 32, and a number of nozzle holes 33 communicating from the air passage 32 to the upper surface of the base 3 are provided. Thus, the storage case 5 is lifted from the base 3 to reduce the friction coefficient.

  By the way, although the probe pin 21 is directly attached to the lower surface of the test head 2 in the above embodiment, the probe pin 21 may be detachable from the test head 2 as shown in FIG. That is, the probe pin 21 was blocked in a connector unit as a connection partner, and one block was attached to the block plate 8. The block plate 8 is fixed to the detachable plate 82 with screws 83 via spacers 81 for adjusting the vertical position.

  The detachable plate 82 is screwed to the upper surface of the test head 2 with a wing screw 84. The flat cable 9 in which the lead wires connected to the probe pins 21 are gathered is extended upward through a long hole 85 formed in the detachable plate 82 and connected to a connector (not shown). When the detachable plate 82 is attached to the test head 2, the block plate 8 is inserted into the through hole 22 formed in the test head 2, and the probe pin 21 protrudes from the lower surface of the test head 2.

  If comprised in this way, the block board 8 can be pulled out above the test head 2 by removing the thumbscrew 84, and the block board 8 and the spacer 81 can be easily replaced | exchanged according to a model.

  The present invention accurately positions an electronic unit that cannot be used for positioning the reference hole formed in the printed wiring board by potting, thereby reliably applying a large number of probe pins attached to the test head to the connector terminals. It is used for scenes that are touched and inspected.

The perspective view which shows the structure of one embodiment of this invention Side view showing positioning Plan view showing positioning Partial perspective view showing another form of the test head

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inspection apparatus 2 Test head 3 Base 4 Electronic unit 5 Storage case 6 Printed wiring board 7 Positioning block 11 Cylinder 12 Guide bar 21 Probe pin 31 Cover 33 Nozzle hole 51 Potting resin 61 Connector 62 Relay 63 Reference hole

Claims (5)

  The printed wiring board is stored in the storage case in a state in which the printed wiring board is positioned with respect to the storage case by the reference hole provided in the printed wiring board having the connector and the positioning protrusion protruding from the bottom of the storage case. An inspection device that inspects the potted electronic unit by injecting a resin that does not embed the connector into the storage case, and has a test head that can move forward and backward with respect to the connector. A test pin is provided on the test head that contacts the terminal of the terminal, and the positioning means that corrects the posture of the electronic unit so that the printed wiring board is in a proper position by contacting the connector before the probe pin contacts the terminal. An inspection apparatus for an electronic unit, characterized by being formed on a head.   The electronic unit inspection apparatus according to claim 1, wherein a plurality of connectors are provided on the printed wiring board, and at least two connectors facing each other on a diagonal line of the printed wiring board are used as a positioning reference. .   3. The printed wiring board is provided with an electronic component that is a relay or other component and is not buried in a potting resin as in the case of the connector. In addition to the connector, the electronic component is used as a positioning reference. Inspection apparatus for electronic units as described in 1.   4. The electronic unit inspection apparatus according to claim 1, wherein the positioning means uses the outer peripheral portion of the connector as a reference for positioning.   A number of pores are provided on a base on which the electronic unit is placed, and air is ejected from the pores when the positioning means positions the electronic unit. 5. The electronic unit inspection apparatus according to any one of 4 above.

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