JPH0676807U - A device that detects the presence or absence of a board that engages with the upper and lower pedestals - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] When a board on which circuit terminals etc. are installed arrives, the upper and lower pedestals on which the means for inputting inspection inputs are placed contact the board, To provide a device for inputting the input and performing various inspections based on the input, for detecting the presence or absence of a substrate by a photoelectric means or the like, not by detecting the contact itself between the upper and lower pedestals and the substrate. An upper and lower base that moves up and down along a moving frame, and a holding plate that is placed above the base and is movable above the mounted position and that is connected to a light shielding plate. Each of them is installed, and the board is designed so as to come between the upper and lower bases and the holding plate in the vertical direction, and the base plate and the holding plate can be placed on the upper and lower bases. When the upper and lower bases reach a predetermined height when moving to (when the substrate does not arrive) or when the upper and lower mounts move the substrate and pressing plate up and move up (when the substrate arrives) A device for detecting the presence or absence of a substrate that engages with the upper and lower pedestals by determining the position of the holding plate in the up and down direction according to the presence or absence of the shielding of the light shielding plate with respect to the transmitted beam.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a top and bottom device equipped with a contact terminal for inputting an input to the substrate and a contact terminal for catching an output as to the presence or absence of a substrate on which various objects to be inspected, terminals, etc. are placed. The present invention relates to a device for detecting by a table.

[0002]

[Prior art]

 When performing various inspections on a board incorporating electronic components, it is required to sequentially bring the board to the inspection site and perform the inspection.

For example, in order to inspect an electrostatic breakdown of a circuit element, as shown in FIG. 1, the substrate 1 on which the circuit element is mounted is moved and an applied voltage portion for inputting electrostatic breakdown is mounted. The response signal from the high voltage input for inspecting for electrostatic breakdown was measured by moving it to the upper and lower table side and moving the upper and lower table 2 to contact the measuring probe located on the upper side. There is.

In such a case, when the substrate 1 has not arrived above the upper and lower pedestals 2, it is unnecessary and impossible to apply the high voltage input and further measure with the measurement probe 24. Therefore, it is indispensable for the upper and lower pedestals themselves to detect the arrival of the board.

Conventionally, the presence or absence of the arrival of the substrate is detected by the contact itself of the probe 24 with the substrate 1.

However, in such a method, a detection error may occur due to damage of a contact portion, a change in shape, or the like, and it is necessary to use a constituent element which is itself troublesome to change a mechanical contact into an electrical signal. I have no choice.

[0007]

[Problems to be solved by the device]

 In order to overcome the above-mentioned drawbacks of the prior art, the present invention has a configuration in which the moving base can detect the presence or absence of the arrival of the substrate from the positional relationship between the two with a very simple configuration without detecting the mechanical contact itself. The purpose is to provide.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the structure of the present invention is capable of moving up and down along a moving frame, and is mounted above it, and is movable above the mounted position. It is also possible to install the holding plate that is connected to the light shielding plate, and the board is designed so that it comes between the upper and lower bases and the vertical direction of the holding plate, and the board and the holding plate can be placed on the upper and lower bases. When the upper and lower platforms place only the holding plate and move upward (when the board does not arrive), and when the upper and lower stands place the base and the holding plate and move upward (when the board arrives). ), The presence or absence of a substrate that engages with the upper and lower bases is detected by determining the vertical position of the holding plate when the upper and lower bases reach a predetermined height based on the presence or absence of the shielding of the light shielding plate with respect to the transmitted beam. Composed of equipment.

First, the basic principle of the present invention will be described.

FIG. 2A shows a state in which the upper and lower pedestals 2 are located below and the holding plates 3 are placed on the handles 35 on both sides when the substrate 1 does not arrive.

In this case, since there is a fixed gap between the upper and lower bases 2 and the pressing plate 3, the substrate can move in the meantime.

FIG. 2B shows a state in which the upper and lower pedestal 2 moves upward along the moving frame 25 and the substrate 1 and the holding plate 3 are placed.

FIG. 2C shows a stage in which the upper and lower bases 2 reach a predetermined height in order to inspect whether or not the light shielding plate 31 engaged with the holding plate 3 blocks the beam 32. .

In this case, as shown in FIG. 2C, when the substrate 1 is present between the holding plate 3 and the upper and lower bases 2, the holding plate 3 is inevitably the thickness of the substrate 1. Since it is only at a high position, the light shielding plate is also at a high position, and when the upper and lower pedestals are in a predetermined position, they reach the region that transmits the beam 32, block the beam, and have a light receiving element from the beam. You can turn on any of the sensors.

On the other hand, as shown in FIG. 2D, when the substrate 1 has not arrived, the holding plate 3 is directly placed on the upper and lower bases 2, and therefore, in FIG. Compared with the case, the position of the holding plate 3 is lower by the thickness of the substrate 1, so that the light blocking plate 31 does not block the light of the beam 32, so that the sensor outputs a signal of "ON". However, it is possible to use the output of "ON" when the board exists and the output of "OF F" when the board does not exist. In this case, the input signal by the photoelectron is negative. If there is no input to the photoelectrons, the bias input will be 0, but such a circuit is required.).

The above operation principle will be described with reference to a specific embodiment.

[0017]

First Embodiment In the first embodiment, as shown in FIG. 3A, it is photoelectrically detected that the upper and lower pedestals 2 have reached a prescribed stage, and the position of the light shielding plate 21 at this stage is determined as described above. The detection method is adopted according to the principle (in FIG. 3 (a), the beam 22 is indicated by a point 22 representing the vertical direction of the paper surface, and the light receiving electronic element 23 is shown at a position corresponding thereto. .).

That is, the light shielding plate 21 is also engaged with the upper and lower bases 2, and the beam 22 is transmitted to a predetermined position corresponding to this.

Then, in the first embodiment, at the stage where the beam 22 is blocked by the upper and lower light blocking plates 23, the light blocking plate 31 of the holding plate 3 blocks the beam 32 corresponding thereto depending on whether or not the light blocking plate 31 of the holding plate 3 blocks the beam 32. Since it is necessary to determine the presence / absence, the output of the sensor 23 corresponding to the upper and lower shading plates 21 is "OFF" due to the interruption of the beam 22, and the shading plates engaged with the holding plate 3 Since it is required for 31 to detect whether or not the corresponding beam 32 is blocked, as shown in FIG. 3B, for example, the outputs from the two sensors 23 and 33 are processed by an AND circuit. The output from the sensor 33 corresponding to the shading plate 31 engaged with the holding plate 3 may be detected (in FIG. 3B, the shading plates engaged with the upper and lower bases block the beam 22. Sometimes the sensor It is assumed that the sensor outputs "OFF", so the outputs from the sensors 22 and 23 are inverted by the "NOT" circuit and then connected to the AND circuit.).

Instead of the AND circuit as shown in FIG. 3B, the relays are activated by the outputs from both sensors 23 and 33 as shown in FIG. 3C, and the two relay circuits 6 are connected. By connecting in series, it is possible to detect the output from the sensor 33 corresponding to the shading plate 31 coupled to the holding plate 3 when the shading plate 21 engaged with the upper and lower bases 2 blocks the beam 22. There is a certain reason (the rationale for interposing the “NOT” circuit in the output from the sensor corresponding to the light shielding plate 21 coupled to the upper and lower pedestals 2 is the same as in the case of FIG. 3B above).

[0021]

Second Embodiment When the vertical movement of the upper and lower bases 2 is moved by the pulse motor 8, the positions of the upper and lower bases can be detected and controlled by the number of pulses.

In this case, the light shielding plate 31 coupled to the holding plate 3 drives the upper and lower bases at the stage of blocking the beam when the base plate 1 is not interposed between the upper and lower bases 2 and the holding plate 3. If the range of the number of pulses was N ₁ to N _2, the sensor 33 that the number of pulses counted for driving the pulse motor, corresponding to the light shielding plate 31 attached to the pressing plate 3 when it is in between the N ₁ and N ₂ Since it is necessary to detect the output of the upper and lower bases 2, the comparison circuit 9 which uses the moving position of the upper and lower bases 2 as a reference for the number of pulses as shown in FIG. If the output based on this and the output from the sensor 33 corresponding to the light shielding plate 31 engaged with the holding plate 3 are combined by the AND circuit, is there a board between the holding plate 3 and the upper and lower bases 2? It is possible to detect whether or not That.

Note that the presence or absence of the substrate can be detected by a relay circuit as shown in FIG. 4C instead of using the AND circuit as shown in FIG. 4B. It is the same.

In each of the above-described embodiments, the configuration in which the presence or absence of the substrate is detected by a hardware circuit such as an AND circuit or a series connection circuit of relays is shown. It goes without saying that it is possible to detect the presence or absence of the substrate by inputting the points and the output from the sensor corresponding to the light shielding plate engaged with the holding plate into the microprocessor.

[0025]

Third Embodiment While the first and second embodiments are both related to detection of a predetermined position of the upper and lower bases 2, the third embodiment is an example related to the relationship between the upper and lower bases 2 and the holding plate 3. .

In the first and second embodiments, as shown in FIG. 5, the upper and lower bases 2 simply mount the holding plate 3 after reaching a certain height, but in the third embodiment, the holding plate 2 is placed. 3, a leg portion 34 is extended downward, and the leg portion 34 is engaged with the upper and lower bases 2 through a compression spring 4 (in FIG. 5, the holding plate 3 and the holding plate 3 are engaged with each other). The state in which the substrate 1 is interposed between the upper and lower pedestals 2 is shown.

The compression springs and the legs 4 are engaged with each other before the upper and lower bases 2 (via the substrate 1 when the substrate 1 is present) place the pressing plate 3 thereon, and the compression is performed. The pressurizing plate 3 is pulled downward by the elastic force 4 of the spring, so that the pressing plate 3 can be reliably placed (in addition, in the position adjacent to the compression spring 4 in FIG. 5). The downward arrow indicates the state in which the leg portions 34 on both sides are pressed downward by the compression panel 4.)

[0028]

Fourth Embodiment FIG. 4 shows an embodiment in which not only the presence / absence of the substrate but also the presence / absence of foreign matter such as dust between the upper and lower pedestals and the substrate can be detected.

In the sixth embodiment, the beam 10 is transmitted slightly above the highest position of the shield plate 31 when the substrate 1 is directly placed on the upper and lower base 3.

When the substrate 1 is directly placed on the upper and lower pedestal 2, the beam 10 is not shielded by the shield plate 31, as shown in FIG.

On the other hand, when a foreign substance such as dust is present between the upper and lower pedestals and the substrate, the position of the substrate is higher than that shown in FIG. 6A as shown in FIG. 6B. The shield plate 31 shields not only the beam 32 but also the beam 10, and the presence of foreign matter is detected by the output of the sensor (light receiving element) 13.

When the sensor (light receiving element) 13 for the beam 10 is ON, the substrate is placed normally, and when the sensor 13 is OFF, the presence of foreign matter is detected, so that the presence of a normal substrate is detected. In the block circuit of, as shown in FIG. 6C, the output from the sensor 33 is connected by an AND circuit, and an AND circuit with the output from the sensor 23 is further provided, or

Alternatively, as shown in FIG. 6D, it is preferable to design a relay circuit as in the first and second embodiments through an AND circuit between the output of the sensor 13 and the output of the sensor 33. (C) and FIG. 6 (e) show the case where a predetermined position of the upper and lower pedestals is detected by a sensor as in the case of the second embodiment, but similar to the third embodiment, a predetermined position of the upper and lower pedestals The same can be done when detecting by the output of the pulse counter.).

[0034]

[Effect of device]

 As described above, according to the present invention, the presence / absence of the board can be definitely detected by photoelectric output or the like, not by detecting the contact itself between the top / bottom board and the board. Since it is possible to detect the presence of foreign matter between the board and the board, if the board arrives, or depending on the embodiment, and if it is determined that there is no foreign material between the upper and lower pedestals, be sure to check the board. It is possible to place it and move it further to move to the next operation.

With the above-described measures of the present invention, the arrival of the substrate can be reliably detected, and various inspections of the elements mounted on the substrate can be reliably performed, so the value of the present invention is immense.

[Brief description of drawings]

FIG. 1 is a side view showing a positional relationship between a substrate and an upper and lower table in a conventional technique.

[Fig. 2 (a)],

[Fig. 2 (b)],

[Fig. 2 (c)],

[Fig. 2 (d)] Side view The operation principle of the present invention is shown.

FIG. 3A is a side view showing the configuration of the first embodiment.

[Fig. 3 (b)],

FIG. 3C is a circuit block diagram showing a method of detecting the output from the sensor used in the first embodiment.

FIG. 4A is a side view showing the configuration of the second embodiment.

[Fig. 4 (b)],

FIG. 4C is a circuit block diagram showing a method of combining the output of the pulse counter and the output of the sensor in the second embodiment.

FIG. 5 is a side view showing the configuration of the third embodiment.

[Fig. 6 (a)],

FIG. 6B is a side view showing the configuration of the fourth embodiment.

[Fig. 6 (c)],

FIG. 6D is a block diagram showing a method of detecting the output from the sensor used in the fourth embodiment.

[Explanation of sign]

 1: Base 11: Rail through which the base passes 2: Upper / lower base 21: Light-shielding plate coupled to the upper / lower base 22: Beam engaged with the light-shielding plate 23: Sensor (light-receiving element) for the beam 24: Probe 25: Moving Frame 3: Presser plate 31: Light-shielding plate coupled to the presser plate 32: Beam corresponding to the above presser plate 33: Sensors (photosensitive element) corresponding to the above beam 34: Both legs corresponding to the presser plate 35: Handle 4: Compression spring 5: Stopper 6: Relay circuit 7: Detector 8: Pulse motor 81: Chain 82: Gear 9: Comparison circuit 10: Beam for detecting foreign matter 12: Foreign matter 13: Sensor for the above beam (photosensitive element)

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[Procedure amendment]

[Submission date] November 16, 1993

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Figure 3]

[Fig. 2]

[Figure 4]

[Figure 5]

[Figure 6]

Claims (5)

[Scope of utility model registration request] 1. An up-and-down stand that moves up and down along a moving frame,
And a holding plate placed above the holding plate and movable to a position higher than the placed position and connected to the light shielding plate. It is designed so that the board and the holding plate can be placed on the upper and lower bases, and when the upper and lower bases move only the holding plate and move upward (when the board does not arrive) and the upper and lower bases. When the base and the holding plate are placed and moved upward (when the substrate arrives), the position of the holding plate in the vertical direction at the stage when the upper and lower bases reach a predetermined height is the light shielding plate for the transmitted beam. A device that detects the presence or absence of a substrate that engages with the upper and lower pedestals by determining whether the substrate is shielded. 2. The upper and lower pedestals are moved by a pulse motor, and the position of a predetermined height of the upper and lower pedestals is set by the pulse count of the pulse motor.
A device that detects the presence or absence of a board that engages with the upper and lower pedestals of the memory. 3. A light shielding plate is engaged with the upper and lower bases, and when the light shielding plates of the upper and lower bases block the corresponding beam, the light shielding plate engaged with the holding plate blocks the corresponding beam. An apparatus for detecting the presence or absence of a board which engages with the upper and lower bases according to claim 1 characterized by determining whether or not there is a utility model registration. 4. A utility model registration claim characterized in that the leg portion is extended downward from the pressing plate, and the leg portion is engaged with the upper and lower bases via a compression spring. A device for detecting the presence or absence of a substrate that engages with the upper and lower bases described in 1. 5. The beam is separately transmitted at a position higher than the highest position of the light blocking plate coupled to the upper and lower tables when the substrate is directly placed on the upper and lower tables, and the light blocking plate blocks the separately transmitted beam. By determining whether or not there is a foreign substance between the substrate and the upper and lower pedestals, it is possible to determine whether there is a foreign substance or not. A device that detects existence.