JP3220311U - Housing displacement measuring jig - Google Patents

Abstract

A simple housing displacement measuring jig capable of electronically measuring and determining pass / fail of an object to be measured when measuring a displacement such as a warp of a device housing in a notebook personal computer or the like. I will provide a. A measuring pedestal 4 for mounting a bottom surface or a sole of a casing to be measured, a moving axis 2 for moving the measuring pedestal 4 up and down by sliding in the housing 1, and a measuring pedestal via the moving axis 2. 4 is pressed against the bottom surface or the sole of the housing, and the measurement base 4 on which the bottom surface or the sole of the object to be measured is mounted, and the elastic material 3 having an elastic force that does not hinder the compression due to the pressing load applied by the moving shaft 2, and A measurement unit is formed by a displacement sensor 5 that measures the displacement of the measurement base 4 from the reference position, a base plate on which a required number of measurement units for mounting the object to be measured are arranged, and measurement data obtained by the displacement sensor is processed and determined. An arithmetic processing circuit is used. [Selection] Figure 1

Description

By mounting the bottom or sole of the measurement target housing such as a laptop computer on the measurement pedestal of the measurement unit and measuring the displacement from the reference position of the measurement pedestal with a displacement sensor, the deformation and distortion of the housing can be electronically detected. A simple housing displacement measurement jig that measures mechanically and determines pass / fail such as warping of the bottom surface of the object to be measured.

When a device such as a laptop is placed on a desk or the like, if the housing is deformed or distorted, the feet placed on the bottom will not contact the desk in a well-balanced manner, and the housing may tilt or rattle. Leads to user complaints. In order to prevent such troubles, the manufacturer's production line places the device on a surface plate and measures the gap between the surface plate and the bottom of the chassis or the sole with a predetermined gap cage to make a pass / fail judgment. However, the accuracy of the determination is poor because of the visual measurement determination, and defective products have also passed through.

Problems that the device tries to solve

When measuring the displacement such as warping of the device housing in a notebook computer, etc., it is easy to judge whether the measurement target is good by measuring electronically instead of visual judgment using a gap cage etc. A housing displacement measuring jig is provided.

Means for solving the problem

A measurement pedestal that can be moved up and down according to the warp and displacement of the case to be measured, an elastic material that presses the measurement pedestal against the bottom or sole of the case, and a measurement pedestal Displacement obtained by forming a measurement unit with a displacement sensor that measures displacement from the reference position, a base plate on which the required number of measurement units are arranged, and an arithmetic processing circuit that processes and determines measurement data obtained by the displacement sensor Judgment of warp, displacement, etc. by the amount is performed.

Effect of device

The bottom or sole of the measurement target housing, such as a laptop computer, is mounted on the measurement base of the measurement unit, and the amount of displacement from the reference position of the measurement base is measured by a displacement sensor, and quantitatively determined by the displacement from the reference position. In addition, it is possible to improve the efficiency of the work by determining the quality and displaying the quality determination result on a display or the like.

1 and 2 are conceptual diagrams of a measurement unit in a housing displacement measuring jig according to the present invention. Reference numeral 1 denotes a housing that slides the moving shaft 2 to move the measuring pedestal 4 up and down, and the elastic member 3 receives the measuring pedestal or moving shaft so that the measuring pedestal does not deviate from the bottom surface or the sole of the housing to be measured. . Reference numeral 5 denotes a displacement sensor, and 6 denotes a height adjustment base of the displacement sensor. Various types of displacement sensors, such as piezo element type, laser beam type, and inductive proximity type, are conceivable. From the viewpoint of size, cost, etc., a metal detector is approached using a coil coupled to a high-frequency oscillation circuit as a detection element. The inductive proximity type that detects the strength of the induced current generated in the metal body is suitable, and members such as the housing and the moving shaft that are separated from the sensor by a predetermined distance may be formed of resin or metal. The measurement pedestal 4 must be made of metal such as iron, stainless steel, aluminum, etc., with the required size, and it detects the difference in the strength of the induced current generated by the distance between the measurement pedestal 4 and the displacement sensor and performs arithmetic processing. To measure the warp and displacement of the housing.

FIG. 3 (1) shows a state in which the moving shaft 2 is pushed down to the bottom of the movable range of the housing, and (2) shows a state in which the moving shaft 2 is raised to the top of the movable range of the housing. The range is the movable range of the moving axis 2 and indicates the measurable range of displacement at the bottom surface 14 and the sole 15 of the measurement target casing such as a notebook computer. The elastic material 3 is formed of a rubber material, a spring material, or the like, and is an elastic material provided with a measurement pedestal on which a bottom surface or a sole to be measured is mounted and an elastic force that does not prevent compression due to a pressing load applied by the moving shaft. Is the biggest point. That is, the displacement measurement cannot be performed with a strong elastic force by which the measurement base on which the measurement target is mounted is pushed up by the elastic material. The elastic material must have an elastic force that does not push up the measurement target and keeps the measurement pedestal in contact with the measurement target while the measurement target is mounted on the measurement pedestal. The natural length and elastic force of the elastic material are determined in consideration of the load due to the measurement target, the measurement base, and the load due to the moving shaft.

FIG. 4 shows a configuration in which all of A, B, C, and D are configured and arranged on the base plate 7 as measurement units, and the bottom surface or the sole of the measurement target casing such as a notebook personal computer is mounted on the measurement base. In this case, the state where the moving shaft is pushed down to the lowest of the movable range of the housing is used as a measurement standard, and only the floating amount of the housing to be measured is measured, and all of A, B, C, and D are measured. By knowing how to float, it is easy to determine where the warp of the housing to be measured has occurred. FIG. 5 shows a configuration in which only A is a measurement unit and a blank pedestal fixed at a reference height for presetting B, C, and D is arranged on the base pre-rate. The measurement reference in this case is the blank pedestal B, The height of C and D is L0, and the measurement reference is preferably the center point of the measurable range of displacement in the displacement sensor, and the measurement unit can measure floating and sinking with respect to the measurement reference. FIG. 6 shows a state in which the calibration tool 8 is placed on the measurement base of the measurement unit and the reference height of the measurement unit is measured, which is effective in measuring the ups and downs of FIG. In this case, the reference height may be set in a state where the measurement base is pushed down to the bottom.

FIG. 7 shows the concept of an arithmetic processing circuit that processes and determines the measurement data obtained from the displacement sensor 5. The displacement sensor output is noise-removed by the buffer circuit 9, required amplification, and converted to digital data by the A / D conversion circuit 10. Then, it is processed by the arithmetic processing circuit 11 and the required data is displayed on the LCD display 13. Reference numeral 12 denotes a memory circuit for storing reference value data and measurement results, which are read and processed as necessary. The number of sensor units, the number of blank pedestals, and the positions at which they are arranged can be optimally selected and used according to the usage conditions such as the shape, size, float, and sink measurement of the object to be measured.

In the configuration shown in FIG. 1, the housing, the moving shaft, and the measurement pedestal are formed of aluminum, the housing is φ45 mm, the height is 50 mm, the moving shaft is φ20, the height is 30 mm, the measurement pedestal is 3 mm thick, 30 mm wide, and length. A stainless steel coil spring was applied as the elastic material. As the displacement sensor, an inductive proximity sensor having a diameter of 30 mm and a thickness of 25 mm was applied. As shown in FIG. 4, four measurement units were arranged on the base plate. Since the recommended measurement distance of the inductive proximity sensor used is 3 mm, a laptop computer with four rubber feet placed diagonally is mounted on the measurement base, and the maximum lift of 3 mm at the position where the displacement sensor is placed is measured. I can do it. For example, the float exceeding 0.3 mm was judged as defective, and the shipping NO was displayed. Further, the predicted location of the displacement was displayed as an image on the LCD with a schematic diagram. The number of measurement units, the number of blank pedestals, and the positions to place each are optimally selected depending on the usage conditions, such as the shape, size, foot position, and whether to measure floating or sinking. To do. As the measurement sensor, piezo element type, laser beam type, etc. can be used for the same measurement, the material is not limited to aluminum, various selections such as iron, stainless steel, resin etc. are possible, such as functions, The configuration, structure, material, dimension, and the like can be variously modified and applied without departing from the spirit of the present invention.

, Shows the conceptual diagram of the measurement unit in the case displacement measuring jig according to the present invention (1) shows a state in which the moving shaft 2 is pushed to the bottom of the movable range of the housing, and (2) shows a state in which the moving shaft 2 is raised to the top of the movable range of the housing. Shows a state diagram in which four measuring units A, B, C, D are arranged on the base plate Shows a state diagram in which one measuring unit A and three blank pedestals B, C, D are arranged on the base plate. Indicates a calibration tool for reference calibration of the measurement unit Indicates the configuration of the arithmetic processing circuit that processes and determines the measurement data obtained by the displacement sensor

DESCRIPTION OF SYMBOLS 1 Housing 2 Moving shaft 3 Elastic material 4 Measurement base 5 Displacement sensor 6 Displacement sensor base 7 Base plate 8 Configuration tool 9 Buffer circuit 10 A / D converter 11 Arithmetic processing circuit 12 Memory circuit L Measurement height 13 LCD display L0 Reference height The

Claims (3)

For measuring jigs that measure displacement such as warping of the bottom of the device housing in notebook computers, etc., slide the inside of the measurement pedestal that mounts the bottom or sole of the housing to be measured, and move the measurement pedestal up and down The measurement base is pressed against the bottom surface or sole of the chassis via the movement axis to be moved and the movement shaft, and the measurement base on which the bottom surface or sole of the measurement target is mounted and the compression by the pressing load applied by the movement axis are not hindered. A measurement unit is formed by an elastic material having elasticity and a displacement sensor that measures the displacement of the measurement pedestal from the reference position, and a base plate and a displacement sensor that provide the required number of measurement units for mounting the measurement target A simple case modification that consists of an arithmetic processing circuit that processes measurement data and performs displacement determination such as warping based on the measured displacement. Measurement jig. Equipped with a measurement base that can be moved up and down according to the warp and displacement of the chassis, and the bottom or sole of the chassis to be measured The simple housing displacement measuring jig according to claim 1, wherein blank pedestals fixed at a reference height are respectively arranged at a required number of base pre-rates. The measurement data of the displacement sensor obtained by pressing the reference surface of the calibration tool against the upper surface of the measurement pedestal of the measurement unit is stored in the arithmetic processing circuit as the reference position data of the measurement unit. The simple housing displacement measuring jig according to claim 1, wherein the reference position of the measurement unit is calculated and corrected based on the stored reference position data every time measurement is performed.