JPS63140977A - Object detector - Google Patents

Abstract

PURPOSE:To perform stable detection and to easily detect the abnormal arrange ment of an object to be detected by detecting the position of a detection rod whose tip abuts on the object to be detected by a photosensor. CONSTITUTION:A light receiving element 18b receives light and turns off in the normal state, and a light receiving element 19b does not receive light and turns on because light from a light emitting element 19a is cut off by the detection rod 17. When a resin tablet 2 is not stored in a buffer 21, the detection rod 17 moves down below its normal position and both photosensors 18 and 19 turn off. Further, when the resin table 2 is inserted while caught in the middle of the buffer 21, the detection rod 17 whose tip abuts on the resin tablet 2 is above the normal position and either of the light receiving elements 18a and 19a does not receive light and the photosensors 18 and 19 turn on. Therefore, whether or not the resin tablet 2 is pressed and its abnormal arrangement are detected with the outputs of the photosensors 18 and 19.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to an object presence/absence detection device such as the resin tablet detection 8JI structure of a multi-plunger type molding device in a semiconductor manufacturing process, for example. be.

(Prior Art) The manufacturing process of semiconductor devices is being automated year by year with the aim of reducing product costs, stabilizing and improving quality, etc. Automation is also progressing in the molding process, which is one of the manufacturing processes, with the molding method shifting from a single plunger type to a multi-plunger type. The resin tablets used in one type of multi-plunger are supplied from a parts feeder (raw material supply machine), etc., and are automatically arranged, set in a mold together with the loaded lead frame, and molded.

FIG. 3 shows a configuration diagram of a conventional resin tablet arrangement section,
The resin tablet 2 fed into the parts feeder 1 is passed through a linear feeder 3 and a shutter 4 to a turntable 5.
One piece is supplied to each person. Turntable 51 years old 1 V
Every time t4 fat tablet 2 is fed, it rotates 1/4,
Resin tablet)・2 missing is detected, good resin tablet 2 is inserted into buffer 6, and defective resin tablet 2 is detected.
discharge. 7 is a sensor for detecting the absence of the resin tablet 2; 8 is a mechanism for inserting the resin tablet 2 into the buffer 6; 9
is a discharge mechanism for defective resin tablets 2.

The buffer 6 moves one pitch at a time in accordance with the rotation of the turntable 5, and detects the presence or absence of the resin tablet 2 inserted from the turntable 5 using an air sensor. Then, when a predetermined resin tablet 2 is inserted into the buffer 6, the rotation of the motor 10 moves the buffer 6 to the supply section to the mold.

FIG. 4 shows a mechanism for detecting the presence or absence of the resin tablet 2 in the buffer 6. An air outlet 12 is formed in the bottom 11 of the buffer 6, and this air outlet 12 is connected to an air sensor provided outside the buffer 6. 13 and a pipe 14. The resin tablet 2 supplied from the turntable 5 to the buffer 6 blocks the air outlet 12. This causes a pressure change in the air sensor 13, and the presence or absence of the resin tablet 2 is detected based on this pressure change.

(Problems to be Solved by the Invention) However, in the conventional resin tablet presence/absence detection mechanism described above, if small pieces or resin scum of the resin tablet 2 are present in the buffer bottom 11, the gap between the buffer bottom 11 and the resin tablet 2 is A gap is created in the air outlet 12.
There was a problem in that air leakage occurred from the sensor and the detection function of the sensor 13 was lost. Furthermore, even if the resin tablet 2 is not properly stored in the buffer 6, for example, stored diagonally, the air sensor 13 will show a normal value as long as no air leaks, and the resin tablet 2 will
is sent as is to the next process, and a shutter installed at the bottom opens. However, there was a problem in that the resin tablet 2 remained obliquely stored in the buffer 6 and did not fall, and the IC handled by the resin tablet 2 was not molded.

SUMMARY OF THE INVENTION An object of the present invention is to provide an object presence/absence detection device capable of performing stable detection by eliminating the above-mentioned problems of malfunctioning of the detection function and inability to detect abnormal placement of an object to be detected.

(Means for Solving the Problems) The present invention provides an object presence/absence detection device that is supported by a fixed part so as to be movable up and down, and after the tip moves downward and comes into contact with an object to be detected stored in a storage body. It consists of a moving detection rod, a light-emitting part and a light-receiving part that are arranged opposite to each other with the upper end of the detection rod in between, and two sets are arranged in the vertical direction to detect the position of the upper end of the detection rod when it moves downward. It is equipped with a photosensor that detects the presence or absence of objects and detects abnormal placement.

(Function) In the present invention, the tip of the detection rod provided to be movable in the vertical direction is brought into contact with the object to be detected stored in the storage body, and the position of the detection rod at this time is determined by two sets of photosensors. To detect. When the detection rod is in the normal position, it is detected that the object to be detected is normally stored in the storage body, and when the detection rod is below the normal position, it is detected that the object to be detected is stored in the storage body. It is detected that the object is not housed in the body, and when the position of the detection rod is above the normal position, it is detected that the object to be detected is improperly housed in the body.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure shows the configuration of the resin tablet arrangement section in the multi-plunger one-type molding device according to this embodiment.
5 is a resin cutting unit, 16 is a resin chuck unit, and 17 is a detection rod. The upper part of the detection rod 17 is pushed through the support part 20, and the detection rod 17 is moved up and down by a motor (not shown) via a cam. 18 and 19 are photosensors that detect the state of the resin tablet 2 based on the position of the upper end of the detection rod 17, and 21 is a buffer.

Next, the operation of the above configuration will be explained. The resin tablets 2 fed into the parts feeder 1 are alternately conveyed to the resin cutting unit 15 by the linear feeder 3, and further, the resin tablets 2 are fed one by one to two resin chuck units 16. When the two resin chuck units 16 receive and pick up the resin tablet 2, they each move toward the buffer 21, perform a chuck opening operation on the buffer 21, and insert the resin tablet 2 into the buffer 21. During this insertion, the chuck opening operation and the vertical movement of the detection rod 17 should be linked.

FIG. 2 shows the configuration of the resin tablet detection section according to this embodiment, and FIG. 2(a) shows a state in which the resin tablet 2 is normally stored in the buffer 21. The lower photosensor 19 is composed of a light emitting element 19a and a light receiving element 19b, and is used for detecting the resin tablet 2. Upper photosensor 18
consists of a light emitting element 18a and a light receiving element 18b, and is used to detect an abnormal storage state of the resin tablet 2. The detection rod 17 is made of a material that does not transmit light, such as aluminum. In the normal state of FIG. 2 (al), the light-receiving element 18b receives light and is turned off, and the light-receiving element 19b does not receive light because the light from the light-emitting element 19a is blocked by the detection rod 17, and is turned on.

In FIG. 2 fbl, the resin tablet 2 is not stored in the buffer 21, so the detection rod 17 is lowered from the normal position in FIG. (In cl, the resin tablet 2 is inserted in a state where it is caught in the middle of the rosette 21, the detection rod 17 whose tip is in contact with the resin tablet 2 is above the normal position, and both the light receiving elements 18a and 19a are No light received,
Photosensors 18 and 19 are turned on. In this way, since the on/off state of each of the seven photosensors 18 and 19 differs depending on the state of the resin tablet 2, each of the photosensors 18 and 19
The presence or absence of the resin tablet 2 and its abnormal placement can be detected by the output of 19.

(Effects of the Invention) As described above, according to the present invention, the position of the detection rod where the tip touches the object to be detected is detected by the 7-oto sensor, and when the detection rod is in the normal position, the object to be detected is retracted. It is possible to detect that the object is properly stored in the body, and it is possible to detect that there is no object to be detected because the detection rod is located below the normal position. Abnormal placement of objects can be detected. Therefore, detection failure due to air leakage does not occur as in the prior art, stable detection can be performed, and abnormal placement of the object to be detected can be easily detected.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a resin tablet arrangement section according to the present invention, FIG. 2 is a configuration diagram of a resin tablet detection section according to the invention, FIG. 3 is a perspective view of a conventional resin tablet arrangement section, and FIG. 4 is a perspective view of a conventional resin tablet arrangement section. FIG. 3 is a configuration diagram of a resin tablet detection section. 2 Resin tablet, 17... Detection rod, 18, 19, Photo sensor, 18a, 19a... Light emitting element, 18
b. 19b light receiving element, 20... support part, 21... buffer. ! ? ：Kyoudishō 21, °Ha゛°・Sofa

Claims (1)

[Claims] (1) In an object presence/absence detection device that detects the presence or absence of an object to be detected stored in a storage body, the device is supported by a fixed part so as to be movable up and down, and when it moves downward, the tip hits the object to be detected stored in the storage body. It consists of a detection rod that moves upward after contact, and a light-emitting part and a light-receiving part that are arranged opposite to each other with the upper end of the detection rod in between.They are arranged in two sets vertically, and the position of the upper end of the detection rod when it moves downward. An object presence/absence detection device comprising a photosensor that detects the presence or absence of an object and detects abnormal arrangement.