JP3023419U - Micro inspection machine - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: It is not necessary to use a light source supplier having an enormous volume unlike a general micro-type inspection apparatus, and a decrease in light conduction efficiency and an increase in cost caused by adopting optical fiber conduction. Solve the drawbacks of. A micro-type inspection / photographer that transmits a signal by using a cable instead of an optical fiber, which uses a light source including a small-volume light emitter such as a light-emitting diode or a micro-type tungsten lamp provided in itself. Then, the object to be measured is directly irradiated, and the electric signal after image formation is carried by the multi-core cable, and this is processed into a visual signal that can be displayed on the display.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention is a micro-type inspection / photographer, and in particular, it illuminates an object to be measured directly with a kind of self-contained light source, transmits the electric signal after image formation with a multi-core cable, and converts it into a visual signal that can be displayed on a display. Mold inspection and photographing machine.

[0002]

[Prior art]

 Since some industrial products and machines have small openings and curved passages, it is not possible to directly inspect the internal structure for defects with the naked eye, and a long flexible micro inspection device. It shall be inspected by inserting it inside the product or machine using.

In the conventional micro-type inspection apparatus, the optical line of the light source supplier located outside is transmitted to the inside of the inspection product or the machine by the optical fiber, and the optical signal after the image formation is transmitted to the outside of the product or the machine by another optical fiber. It is transmitted and then converted into a visual signal to be displayed on the display. FIG. 1 shows the configuration of a general micro-type inspection apparatus, and the operation principle thereof will be described below.

The light source supplier 11 supplies a light beam necessary for inspection, and usually has a high-efficiency halogen lamp and converts electric energy into light energy. The first photoconductive fiber 12 connects the light source supplier 11 and the measured object 10 and transmits the light from the light source supplier 11 to the measured object 10. The second photoconductive fiber 13 causes its light input end to approach the object to be measured, and causes the light output end to output an optical signal when the object 10 to be measured is irradiated and forms an image.

The area-type image observer 14 is provided at the output end of the second photoconductive fiber 13 and converts an optical signal output from the second photoconductive fiber 13 into a corresponding electric signal. The signal processor 15 supplies the power supply power and the drive signal required by the area-type image observer 14, and converts the signal converted by the area-type image observer 14 into an image signal having appropriate intensity and waveform. It is to output.

The display 16 is connected to the output end of the signal processor 15 by a cable and converts the electric signal processed by the signal processor 15 into a video signal. However, since the conventional micro-type inspection device requires the light source supplier 11 of the high-efficiency halogen lamp, it has a large volume, is inconvenient to operate and carry, and is contrary to the main idea of making the micro-type inspection / photographer microscopic. Is.

Besides, the conventional micro-type inspection apparatus is expensive because it transmits the light source and the image by the two optical fibers of the first photoconductive fiber 12 and the second photoconductive fiber 13. Since the cost of the photoconductive fiber 13 increases as the length increases, the length generally used is limited to 50 cm or less. For this reason, the use of the above-mentioned conventional micro-type inspection device cannot be popularized.

Besides, low photoconductive efficiency is one of the serious defects of the conventional micro-type inspection apparatus. The light generated by the light source supplier 11, the connecting portion of the first photoconductive fiber 12 and the input end of the second photoconductive fiber 13 must both be adjusted to an optimum angle to prevent light loss. It is difficult to prevent light loss inside the relatively long first photoconductive fiber 12 and second photoconductive fiber 13. For this reason, in the light source supplier 11 of the conventional micro type inspection apparatus, it is necessary to compensate for these light losses by using a highly efficient lamp that emits high heat.

[0009]

[Problems to be solved by the device]

 The object of the present invention is to improve the above-mentioned drawbacks of the conventional micro-type inspection device, to reduce the cost, to reduce the loss during the conduction process in the optical fiber of the light source, and to generate the internal high temperature by the high-efficiency light source. It is an improvement such as prevention.

[0010]

[Means for Solving the Problems]

 The above-mentioned purpose is to irradiate the object to be measured directly with a light source consisting of a light emitting diode of its own or a micro-sized tungsten lamp or other light emitting body of micro type, and transmit an electric signal after image formation by a multi-core cable. It is achieved by a micro-type inspection camera that processes into a visual signal that can be displayed on a display. With this configuration, it is not necessary to use a light source supplier having an enormous volume for conducting an optical signal by using an optical fiber, unlike a general conventional micro-type inspection apparatus, and It is possible to prevent a decrease in efficiency and save costs.

[0011]

[Embodiment of device]

 Hereinafter, the present invention will be described in detail with reference to the drawings. 2 and 3 respectively show the configuration and circuit of an embodiment of the micro-type inspection / photographer of the present invention. As shown in the figure, the structure of the micro type inspection / imaging machine of the present invention includes the following. The micro-type photographing head 20 is composed of a light source 21, an image forming lens 22, an area type image observing device 23, a drive circuit 24, and a housing 25, by which the measured object 10 is measured and a signal is generated. .

The multi-core cable 30 is an external connection portion of the micro-type imaging head 20 and supplies a power required by the micro-type imaging head 20 and a signal generated after measurement of the DUT 10 of the micro-type imaging head 20. Is used for output. The multi-core cable 30 is housed in a flexible metal tube 31, one end of the flexible metal tube 31 is connected and fixed to the housing 25 of the micro-type imaging head 20, and the other end is a housing of the signal circuit board 40. It is connected and fixed to the body so that the micro-type imaging head can be bent and fixed in any direction.

The signal circuit board 40 is connected to the multi-core cable 30 and the display unit 50, is supplied with the power supply power and the driving time sequence required by the micro-type imaging head 20, and is formed after irradiating the DUT 10. The generated video signal is processed and output to the display unit 50, and this signal is made a visible image. Further, the detailed structure of the micro-type photographing head 20 of the micro-type inspection photographing device of the present invention shown in FIGS. 2 and 3 includes the following.

The light source 21 is provided outside the image forming lens 22, and includes several 0.8 × 1.6 mm micro surface-adhesive light emitting dipoles (diodes) or an outer diameter of 1.7 mm micro type tungsten lamp. The minute volume light-emitting device is directly irradiated onto the object to be measured 10 by a light source soldered on the printed circuit board. Since there is no need to separate colors in black-and-white photography, using a light-emitting dipole as the light source provides the simplest and most economical design. In particular, the ultra-bright red LED is the most suitable illumination for the micro-type inspection camera of the present invention.

The image forming lens 22 forms an image of the measured object 10 on the area-type image observer 23. Further, in order to satisfy the two requirements of the micro type and the low cost, the image forming lens 22 is designed based on the image forming principle of a needle lens. In the embodiment of the image forming lens 22 of the present invention, a glass transparent lens with a diameter of about 5 mm is used, and the opening is a needle hole with a diameter of about 1 mm. It is formed on the image observer 23.

The area type image observer 23 has a ceramic body of a general standard commercial type image observer with a diagonal length of at least 16 cm, and the micro type photographing head 20 has an outer diameter of 15.2 cm or less. In view of the inability to meet the conventional goal of making the above, it is considered in the present proposal that the observer crystal of the area-type image observer 23 is directly adhered to the printed circuit board to form a fine gold wire or aluminum wire. Connect the circuit of the crystal of the observer on the printed circuit board with a conductor such as. Finally, a transparent resin is applied to the crystal and conductor to cover the surface. The size of a general 1/3 inch image observer crystal is about 6.3 x 5.2 mm and its diagonal is about 8.2 mm, so if a 1/4 inch image observer crystal is used, The dimensions of the devised embodiment are much smaller.

The configuration of the drive circuit 24 includes the following. The first buffer 241 increases the driving force of the high-frequency horizontal drive signal and the charge reset pulse, shapes the waveform, and then drives the area type image observer 23. The voltage coupler 243 improves the driving force of the output signal of the area image observer 23. The housing 25 accommodates the parts of the micro-type imaging head 20, and is connected and fixed to the flexible metal tube 31 that accommodates the multi-core cable 30, and the flexible metal tube 31 is driven and localized.

Since the drive circuit 24 in the micro-type photographing head 20 has a different DC potential of the area type image observer 23 depending on the manufacturer, another set of the DC booster circuit 242 is provided according to the situation, and the first buffer is provided. The direct current potential is raised by the charge reset pulse after raising the driving force at 241, thereby driving the area-type image observer 23. However, since it is not necessary to consider the problem of the light source in a place where the amount of light is sufficient or in an open space, the micro-type inspection camera of the present invention can be used for other purposes in that case. For example, a hidden monitoring device or the like.

In a place with a sufficient amount of light, or in an open space, the structure of the micro-type inspection / photographer of the present invention may be a micro-type inspection / photographer that does not include the above-mentioned set of light sources 21. it can. FIG. 3 shows the circuit configuration of the signal circuit board 40 of the micro-type inspection / photographer of the present invention, which includes the following.

The time sequence generator 41 generates signals necessary for driving the area-type image observer 23, for example, a horizontal drive signal, a charge reset pulse signal, a vertical drive signal, and a sampling pulse signal input to the signal processor 44. Used for. The second shock absorber 42 enhances the driving force of the high frequency signal generated by the time sequence generator 41, and causes the micro type photographing head 20 to be input by the multi-core cable 30.

The third buffer 43 performs the time delay processing of the sampling pulse generated from the time sequence generator 41 and then sends it to the signal processor 44, and the multi-core cable of the output signal of the area-type image observer 23. To allow the signal processor 44 to perform normal sampling. The third buffer 43 may also comprise a buffer / and / or a selectable / microadjustable time delay circuit co-configured by interconnection of resistors and capacitors.

The signal processor 44 includes one sampling circuit 441 and one processing circuit 442, and samples the signal carried by the micro-type imaging head 20 via the multi-core cable 30 according to the time sequence of the sampling pulse. Then, it is processed into an appropriate visual signal, and then input to the connected display unit 50 to make the signal visible.

The time sequence required by the area-type image observer 23 is extremely high, and in the case of an image observer having 512 pixels (pixels) horizontally and 492 pixels vertically, the frequency of the horizontal drive signal, charge reset pulse, etc. When transmitting such a high-frequency signal over a multi-core cable as high as 9.5 MHz, due to the resistance in the multi-core cable and the stray capacity 32 between the lines, attenuation, distortion, and delay with respect to the high-frequency signal may occur. The phenomenon occurs.

The longer the length of the multi-core cable, the more severe the problems of signal attenuation, distortion, and delay. In order to solve the problem caused by the transmission of the high frequency signal through the multi-core cable 30, the present invention uses a high frequency horizontal drive signal generated by the time sequence generator 41 by the second buffer 42 provided on the signal circuit board 40. After the driving force of the charge reset pulse signal is increased, it is sent to the first buffer 241 of the driving circuit 24 in the photographing head 20 by the multi-core cable 30 to further increase the driving force of the high frequency horizontal driving signal and the charge reset pulse. , Shape the waveform, and drive the area image observer 23.

However, the operation of the above-mentioned second buffer 42 only increases the strength of the signal transmitted to the imaging head 20, and is not a necessary condition for signal transmission, so the high-frequency signal generated by the time sequence generator 41 is Depending on the strength, it can be decided whether to install or not. The charge reset pulse signal is normally set to a constant DC potential of 3.0V, for example.

According to the present invention, a capacitor 244 and a DC booster circuit 242 are provided on the driving circuit board 24, and the buffer 241 increases the driving force of the charge reset pulse signal to raise the DC potential, thereby increasing the area type image observer. Drive 23. The output signal of the image observer 23 is a high frequency analog signal and has a low signal value. In the present invention, a voltage coupler 243 composed of a transistor and a resistor or other device such as an avalanche transistor is provided on the drive circuit board 24 to drive the output signal of the area-type image observer 23. At the same time, the signal is transmitted to the signal circuit board 40.

Further, the time sequence generator 41 simultaneously generates a signal for driving the area image observer 23 and a sampling pulse to be transmitted to the signal processor 44. A signal for driving the area-type image observer 23 is transmitted to the micro-type photographing head 20 by the multi-core cable 30, in which the first time delay occurs. Further, when the output signal of the area-type image observer 23 is conveyed to the signal circuit board 40 by the multi-core cable 30, a second time delay occurs, but these two time delays are the long time of the multi-core cable 30. Increase proportionally.

In order to solve the time delay problem that occurs when the signal passes through the multi-core cable 30, the present invention uses a third buffer 43 installed on the signal circuit board 40 to perform a time sequence. After the sampling pulse generated from the generator 41 is time-delayed, it is input to the signal processor 44 so that the output signal of the area-type observer 23 can be time-delayed via the multicore cable 30. , So that the signal processor 44 can normally perform sampling. It is a selectable / fine-tunable time delay circuit that is jointly constructed by interconnecting the buffer and / or the resistor and the capacitor.

Normally, the delay time of the buffer is 5 ns, and when the buffer is connected in series, the delay time is several times 5 ns, but the finely adjustable time delay circuit composed of the resistor and the capacitor Since the third buffer 43 is a selectable / fine-adjustable time delay circuit composed of a buffer and / or a resistor and a capacitor, the length of the third buffer 43 can be adjusted because the delay can be finely adjusted. Different time delays due to different multi-core cables 30 are caused by the selection and fine adjustment of the third buffer, so that the sampling pulse transmitted from the time sequence generator 41 to the signal processor 44 has an appropriate delay and the area type projection. The output signals generated from the image observer 23 and conveyed to the signal circuit board 40 via the multi-core cable 30 simultaneously reach the signal processor 44, and the signal processor 44 is normally sampled. It is a ring.

However, since the lengths of the multi-core cables 30 required for different objects to be measured 10 are different from each other, whether or not the third shock absorber 43 needs to be installed or needs to be adjusted. Whether or not there is is determined by the length of the multi-core cable 30 or the delay time generated when the output signal of the area-type image observer 23 passes through the multi-core cable 30.

Summarizing the above, the micro-type inspection / photographer of the present invention is particularly the only small entrance / exit or hole because of the unique structure of the micro-type inspection / photographer of the present invention and the advantages obtained from the structure. It is used to inspect items or machines that have For example, the inspection of the internal structure of the engine, cylinder, tubular object, etc. In addition, the present invention can also be used for medical examinations such as dental examinations.

As a result of many trial manufactures and experiments by the inventor of the present invention, the outer diameter of the micro-type photographing head 20 of the present invention should be 0.5 inch, that is, 12.7 mm or less. As a result, this micro-type imaging head not only exhibits a good imaging function, but can be easily inserted into the majority of the measured objects 10 to achieve the intended imaging and measurement purpose.

The above description is given with reference to the embodiments of the present invention, and does not limit the scope of the claims of the present invention. Therefore, any changes or simple modifications made based on the description and drawings of the present invention are included in the specification and claims of the present invention.

[Brief description of drawings]

FIG. 1 is a block diagram of a general prior art micro-type inspection apparatus.

FIG. 2 is a diagram of an embodiment of a micro-type inspection / imaging machine of the present invention.

FIG. 3 is a diagram showing a circuit of an embodiment of a micro-type inspection camera of the present invention.

[Explanation of symbols]

 10 Object to be Measured 11 Light Source Supplyer 12 First Photoconductive Fiber 13 Second Photoconductive Fiber 14 Area Type Image Observer 15 Signal Processor 16 Display (Indicator) 20 Micro-type Imaging Head 21 Light Source 22 Image Forming Lens 23 Area Type Image observation device 24 Drive circuit 241 First buffer 242 DC booster circuit 243 Voltage coupler 244 Capacitor 25 Housing 30 Multi-core cable 31 Flexible metal tube 32 Line stray capacity 40 Signal circuit board 41 Time sequence generator 42 Second Shock absorber 43 Third shock absorber 44 Signal processor 441 Sampling circuit 442 Processing circuit 50 Indicator

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 7/18 E

Claims (13)

[Scope of utility model registration request] 1. A photographing head which is composed of a light source, an image forming lens, an area type image observing device, a drive circuit and a case, and which measures a measured object to generate a signal; and an external connection portion of a micro type photographing head. , A multi-core cable that supplies the power required by the micro-type shooting head and transmits a signal generated after the micro-type shooting head measures the object to be measured; a micro-type shooting connected to the multi-core cable and the display. It supplies the necessary power and drive signals to the head, processes the video signal that is formed after irradiating the object to be measured and inputs it to the connected display device, converts the signal into a visual image and provides it. A micro-type inspection / photographer consisting of a signal circuit that operates. 2. The micro-type photographing head according to claim 1, wherein the light source of the micro-type photographing head comprises one or a plurality of micro-type light emitting diodes provided around the image forming lens and soldered on a circuit board. Inspection camera. 3. The micro according to claim 1, wherein the light source of the micro type photographing head is constructed by providing one or a plurality of micro type tungsten lamps around the image forming lens and soldering on a circuit board. Mold inspection camera. 4. A micro-type photographing head which is composed of an image forming lens area type image observing device, a drive circuit, and a case, and which generates a signal after measuring the object to be measured; Supply the required power of the mold shooting head,
A multi-core cable that transmits a signal generated after the micro-type imaging head measures an object to be measured; and a multi-core cable and a display that are connected to each other to supply required power and drive signals to the micro-type imaging head. , Processing the video signal formed after irradiating the measured object and transmitting it to the connected display device,
A micro-type inspection / photographer consisting of a circuit board that converts the signal into a visual image. 5. The micro-type inspection / photographing apparatus according to claim 1, wherein the image-forming lens of the micro-type photographing head is a needle hole image-forming lens. 6. An observer crystal of an area type image observer of a micro type photographing head is directly adhered to a printed circuit board, and the crystal is connected to the printed circuit by a conductor such as a fine gold wire or aluminum wire, and finally. The micro-type inspection / imaging machine according to claim 1 or 4, which is coated with a transparent resin. 7. The structure of a driving circuit of a micro type photographing head is: a first buffer for driving an area type image observer by increasing a driving force of a high frequency horizontal driving signal and a charge reset pulse and shaping a waveform. The micro-type inspection / imaging device according to claim 1 or 4, further comprising: a voltage coupler for increasing a driving force of an output signal of the area-type image observer. 8. An electric charge in which another set of DC boosting circuits is provided according to the DC potential condition of the area type image observing device in which the driving circuit of the micro type photographing head is different, and the driving force is increased by the first buffer. 8. The micro-type inspection imager according to claim 7, wherein the direct-current potential of the reset pulse is increased to drive the area-type image observer. 9. The configuration of the signal circuit board comprises: a time sequence required for driving the area image observer, for example, a time sequence for generating a horizontal drive signal, a charge reset pulse, a vertical drive signal, and a sampling pulse sent to a signal processor. A generator; a second buffer that enhances the driving force of the high-frequency signal generated by the time sequence generator and then transmits it to the micro-type imaging head by a multi-core cable; and a sampling pulse time generated by the time sequence generator A third buffer that performs delay processing and then enters the signal processor to handle the time delay due to the multicore cable transmission of the output signal of the area-type image observer so that the signal processor can perform normal sampling. And a sampling circuit and a processing circuit inside, depending on the time sequence of the sampling pulse, 5. A micro-processor according to claim 1, further comprising a signal processor for sampling and processing a signal carried by the die photographing head via a multi-core cable and transmitting the signal to a connected display device for display. Mold inspection camera. 10. The second buffer of the signal circuit board is dependent on the strength of the high frequency signal generated by the time sequence generator,
10. The micro-type inspection / imaging machine according to claim 9, wherein whether or not to install the micro-type inspection / imaging machine can be considered. 11. Whether or not to install or adjust the third shock absorber of the signal circuit board is determined by the length of the multicore cable or the time delay of the output signal of the area-type image observer via the multicore cable. The micro-type inspection imager according to claim 9. 12. The micro-type inspection / imaging apparatus according to claim 9, wherein the third buffer of the signal circuit board constitutes a time delay circuit that can be selected / fine-tuned by serially connecting a resistor and a capacitor. 13. A multi-core cable is housed in a flexible metal tube, one end of the flexible metal tube and a casing of a micro type photographing head are connected and fixed, and the other end is a signal circuit board casing. The micro-type inspection / imaging machine according to claim 1, wherein the micro-type imaging head is connected and fixed, and the micro-type imaging head can be curved or fixed in any direction.