CA2072174A1 - Video camera system using thermal image detecting means - Google Patents
Video camera system using thermal image detecting meansInfo
- Publication number
- CA2072174A1 CA2072174A1 CA002072174A CA2072174A CA2072174A1 CA 2072174 A1 CA2072174 A1 CA 2072174A1 CA 002072174 A CA002072174 A CA 002072174A CA 2072174 A CA2072174 A CA 2072174A CA 2072174 A1 CA2072174 A1 CA 2072174A1
- Authority
- CA
- Canada
- Prior art keywords
- video camera
- camera system
- persons
- setting means
- detecting means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
- G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/61—Control of cameras or camera modules based on recognised objects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
- H04N23/661—Transmitting camera control signals through networks, e.g. control via the Internet
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/33—Transforming infrared radiation
Abstract
ABSTRACT OF THE DISCLOSURE
A video camera system of a relatively simple construction is capable of automatic photographing, and includes thermal image detecting means 3 formed of a group of a plurality of pyroelectric type thermal detection elements 6a to 6e.
A video camera system of a relatively simple construction is capable of automatic photographing, and includes thermal image detecting means 3 formed of a group of a plurality of pyroelectric type thermal detection elements 6a to 6e.
Description
20721 ~
This invention relates to a video camera system for automatic photographing such as human body tracking photograph operation using thermal images.
There is known a remote controllable video camera which the user can control by use of a motor while watching the monitor screen.
In the above prior art, however, the user chiefly controls the camera angle while watching the monitor screen, and thus it is difficult to make automatic photographing without the operator by this video camera.
-SUMMARY OF THE INVENTION
It is an object of the invention to provide a video camera system of a relatively simple constructioncapable of automatic photographing.
According to this invention, there is provided a video camera system including thermal image detecting means formed of a group of a plurality of pyroelectric type thermal detection elements.
In the above video camera system of the invention, a video camera main body and main body supporting portion of the video camera system is connected by lens direction setting means of a one-or 2~7217~
1 two-axis rotation mechanism, and the thermal image detecting means is fixed to the main body supporting portion so as to directly oppose an object being photographed.
Also, in the invention, a person or persons are detected by the thermal image detecting means and human body judging means.
In addition, in the invention, the location of the detected person or persons is decided by human body location detecting means, and the lens direction setting means is operated by picture frame determining means so that the person or persons are substantially fixed at an arbitrary position within the picture frame.
Moreover, in the invention, when one of the persons is specified, the lens direction setting means and the lens angle-of-view setting means are operated so that this person can be substantially fixed at an arbitrary position within the picture frame and to have an arbitrary size.
Also, in this invention, a plurality of persons are detected by the human body judging means, and the zoom mechanism of the camera lens is operated by the lens direction setting means and the lens angle-of-view setting means so that all the persons can be caused 25 to enter in the picture frame.
Also, in this invention, zooming up or down is performed chiefly for the person or persons.
2~72174 1 In addition, in this invention, receiving means and wireless transmission means are provided, and photograph scene setting means corresponding to the above function is provided together with general operating functions.
Moreover, in this invention, the pyroelectric type thermal detection element group is made of a pyroelectric thin film.
Furthermore, in this invention, the pyroelectric type thermal detection element group is one-dimensionally arranged in a straight axis and has a rotation axis which is parallel to the straight axis or tilted by a constant angle thereto so that the pyroelectric type thermal detection element group is rotated around the rotation axis so as to produce a two-dimensional image.
This invention detects human body or bodies by use of a thermal image and scans the human body or bodies, thereby realizing the automatic photographing of video camera.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is an external appearance of a video camera system having thermal image detecting means as one embodiment of this invention;
Fig. 2 is a block diagram of the construction of the video camera system of the embodiment of the invention;
1 Figs. 3A-3D are diagrams useful for explaining the function of the embodiment of the invention;
Figs. 4A and 4B are diagrams of examples of the thermal image detecting means of the embodiment of the invention; and Figs. 5A and 5B are diagrams useful for explaining the way of obtaining the thermal image.
DESCRIPTION OF PREFERRED EMBODIMENT
An embodiment of the invention will be described with reference to Figs. 1 to 4.
Fig. 1 shows the actual use of the embodiment of the invention.
Referring to Fig. l, there are shown a video camera 1, a main body supporting portion 2, thermal image detecting means 3, lens direction setting means 4 having a two-axis rotating mechanism, and a human body or persons 5 to be photographed. The lens direction setting means 4 may have a right, left one-axis rotating mechanism.
The thermal image detecting means 3 is mounted on the main body supporting portion 2 so as to rightly oppose the object to be photographed. This thermal image detecting means 3 detects the direction, size and number of the persons 5. The lens direction setting means 4 controls the video camera 1 to be directed towards the persons 5.
1 The thermal image detecting means 3 includes a group of a plurality of pyroelectric type thermal detection elements. The non-contact measuring system includes the quantum type infrared ray sensor, the infrared CCD and the thermal infrared ray sensor. The quantum type infrared ray sensor and infrared CCD have a high sensitivity and high response, but are necessary to be called (about -100 ~ -200C). Thus, these sensors are unsuitable for public use. On the other hand, the thermal type infrared ray sensor have a relatively low sensitivity and slow response, but are not necessary to be cooled. Thus, the thermal image detecting means 3 employees the pyroelectric effect of the thermal type infrared ray sensor.
Fig. 2 is a block diagram of the internal construction of the video camera system of the invention.
The video camera 1 includes lens angle-of-view setting means for zoom operation. The main supporting body 2 includes the thermal image detecting means 3, human body judging means, human location detecting means, picture frame determining means, lens direction setting means and receiving means.
The wireless remote control includes 25 photograph scene setting means and wireless transmission means.
When a desired function is selected by the photograph scene setting means, a thermal image 1 including a person or persons i3 detected by the thermal image detecting means 3 through the wireless transmis-sion means and receiving means. In addition, the human body judging means and the human body location detecting means decide the number, locations and sizes of persons.
The picture frame determining means determines the angle and size of the picture frame including the persons at the center. The lens direction setting means and the lens-angle-of-view setting means are operated to determine the direction of the lens of the video camera and the amount of zoom, and then the video camera starts to photograph.
Figs. 3A to 3D are diagrams useful for explaining the functions of the embodiment of the invention.
As shown in Fig. 3A, the detected person or persons are fixed at an arbitrary position within the picture frame by controlling the lens direction. As shown in Fig. 3B, the detected person or persons are fixed to be an arbitrary size at the given position within the picture frame by controlling the lens direction and the angle of view. As shown in Fig. 3C, all the detected persons are caused to enter in the picture frame by controlling the lens direction and the 25 angle of view.
In addition, as shown in Fig. 3D, the detected person is zoomed up or down at around an arbitrary 207217~
1 location within the picture frame by controlling the lens direction and the angle of view.
Figs. 4A and 4B show the construction of an example of the thermal image detecting means 3 of the invention. 6a to 6e represent pyroelectric type thermal detection elements (hereinafter, called simply as elements), 7 the group of the pyroelectric type thermal detection elements, and 8 the rotation axis. Fig. 4A
shows that the rotation axis 8 is parallel to the pyroelectric type thermal element group 7, and Fig. 4B
shows that the rotation axis 8 is tilted by a constant angle ~ to the pyroelectric type thermal element group 7. The angle ~ depends on the setting of the structure of the main body supporting portion 2 combined with the video camera and the detection field of angle.
The way to obtain a thermal image by use of the pyroelectric type thermal detection element group 7 will be described with reference to Figs. 5A and 5B.
Fig. 5A shows the cubic field angle of view of a thermal image to be detected, and Fig. 5B shows the detected thermal image. The pyroelectric type thermal detection element group 7 includes 5 elements each of which takes charge of 1/5 the angle of view in the vertical direction.
The pyroelectric type thermal detection element group 7 is combined with optical lenses. The horizontal field angle of view is set to be narrow, and it is moved in the horizontal direction by the rotation 207217~
1 of the rotation axis 8. At each movement of the horizontal angle of view, the pyroelectric type thermal detection element group 7 measures temperature to produce a two-dimentional thermal image as shown in 5 Fig. 5B.
The generally used pyroelectric type infrared ray sen~or is of the so-called bulk type using a sintered pyroelectric thick film. However, this bulk type cannot be formed to have a small thermal time constant and thus it has a slow response. If the pyroelectric type thermal detection elements are formed of a pyroelectric thin film of, for example, PbTiO3, the response time can be reduced to about 1/10 that of the bulk type. Use of the elements of this pyroelectric thin film, since the response time can be reduced, makes it possible to precisely detect the movement of human bodies. In addition, use of the pyroelectric thin film makes it possible to further reduce the size of the elements.
According to this invention, since a group of a plurality of pyroelectric type thermal detection elements is provided on the video camera, automatic scanning photographing chiefly for human bodies can be performed by detecting the person or persons. Also, 25 since operatorless photographing is possible, there are no troublesome operations in photographing and thus the freedom of photographing increase~. In addition, since various different functions can be provided on the 1 remote control, the camera operation becomes simpler, and thus any one can easily produce a video drama, news and so on in which the hero or heroine is oneself.
Moreover, according to this invention, the thermal image can be detected by a relatively simple system in which the group of one-dimensionally arranged pyroelectric type thermal detection elements is rotated.
Furthermore, the response speed of the thermal image can be increased by the element group of the pyroelectric thin film, and the system can be small-sized.
_ g _
This invention relates to a video camera system for automatic photographing such as human body tracking photograph operation using thermal images.
There is known a remote controllable video camera which the user can control by use of a motor while watching the monitor screen.
In the above prior art, however, the user chiefly controls the camera angle while watching the monitor screen, and thus it is difficult to make automatic photographing without the operator by this video camera.
-SUMMARY OF THE INVENTION
It is an object of the invention to provide a video camera system of a relatively simple constructioncapable of automatic photographing.
According to this invention, there is provided a video camera system including thermal image detecting means formed of a group of a plurality of pyroelectric type thermal detection elements.
In the above video camera system of the invention, a video camera main body and main body supporting portion of the video camera system is connected by lens direction setting means of a one-or 2~7217~
1 two-axis rotation mechanism, and the thermal image detecting means is fixed to the main body supporting portion so as to directly oppose an object being photographed.
Also, in the invention, a person or persons are detected by the thermal image detecting means and human body judging means.
In addition, in the invention, the location of the detected person or persons is decided by human body location detecting means, and the lens direction setting means is operated by picture frame determining means so that the person or persons are substantially fixed at an arbitrary position within the picture frame.
Moreover, in the invention, when one of the persons is specified, the lens direction setting means and the lens angle-of-view setting means are operated so that this person can be substantially fixed at an arbitrary position within the picture frame and to have an arbitrary size.
Also, in this invention, a plurality of persons are detected by the human body judging means, and the zoom mechanism of the camera lens is operated by the lens direction setting means and the lens angle-of-view setting means so that all the persons can be caused 25 to enter in the picture frame.
Also, in this invention, zooming up or down is performed chiefly for the person or persons.
2~72174 1 In addition, in this invention, receiving means and wireless transmission means are provided, and photograph scene setting means corresponding to the above function is provided together with general operating functions.
Moreover, in this invention, the pyroelectric type thermal detection element group is made of a pyroelectric thin film.
Furthermore, in this invention, the pyroelectric type thermal detection element group is one-dimensionally arranged in a straight axis and has a rotation axis which is parallel to the straight axis or tilted by a constant angle thereto so that the pyroelectric type thermal detection element group is rotated around the rotation axis so as to produce a two-dimensional image.
This invention detects human body or bodies by use of a thermal image and scans the human body or bodies, thereby realizing the automatic photographing of video camera.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is an external appearance of a video camera system having thermal image detecting means as one embodiment of this invention;
Fig. 2 is a block diagram of the construction of the video camera system of the embodiment of the invention;
1 Figs. 3A-3D are diagrams useful for explaining the function of the embodiment of the invention;
Figs. 4A and 4B are diagrams of examples of the thermal image detecting means of the embodiment of the invention; and Figs. 5A and 5B are diagrams useful for explaining the way of obtaining the thermal image.
DESCRIPTION OF PREFERRED EMBODIMENT
An embodiment of the invention will be described with reference to Figs. 1 to 4.
Fig. 1 shows the actual use of the embodiment of the invention.
Referring to Fig. l, there are shown a video camera 1, a main body supporting portion 2, thermal image detecting means 3, lens direction setting means 4 having a two-axis rotating mechanism, and a human body or persons 5 to be photographed. The lens direction setting means 4 may have a right, left one-axis rotating mechanism.
The thermal image detecting means 3 is mounted on the main body supporting portion 2 so as to rightly oppose the object to be photographed. This thermal image detecting means 3 detects the direction, size and number of the persons 5. The lens direction setting means 4 controls the video camera 1 to be directed towards the persons 5.
1 The thermal image detecting means 3 includes a group of a plurality of pyroelectric type thermal detection elements. The non-contact measuring system includes the quantum type infrared ray sensor, the infrared CCD and the thermal infrared ray sensor. The quantum type infrared ray sensor and infrared CCD have a high sensitivity and high response, but are necessary to be called (about -100 ~ -200C). Thus, these sensors are unsuitable for public use. On the other hand, the thermal type infrared ray sensor have a relatively low sensitivity and slow response, but are not necessary to be cooled. Thus, the thermal image detecting means 3 employees the pyroelectric effect of the thermal type infrared ray sensor.
Fig. 2 is a block diagram of the internal construction of the video camera system of the invention.
The video camera 1 includes lens angle-of-view setting means for zoom operation. The main supporting body 2 includes the thermal image detecting means 3, human body judging means, human location detecting means, picture frame determining means, lens direction setting means and receiving means.
The wireless remote control includes 25 photograph scene setting means and wireless transmission means.
When a desired function is selected by the photograph scene setting means, a thermal image 1 including a person or persons i3 detected by the thermal image detecting means 3 through the wireless transmis-sion means and receiving means. In addition, the human body judging means and the human body location detecting means decide the number, locations and sizes of persons.
The picture frame determining means determines the angle and size of the picture frame including the persons at the center. The lens direction setting means and the lens-angle-of-view setting means are operated to determine the direction of the lens of the video camera and the amount of zoom, and then the video camera starts to photograph.
Figs. 3A to 3D are diagrams useful for explaining the functions of the embodiment of the invention.
As shown in Fig. 3A, the detected person or persons are fixed at an arbitrary position within the picture frame by controlling the lens direction. As shown in Fig. 3B, the detected person or persons are fixed to be an arbitrary size at the given position within the picture frame by controlling the lens direction and the angle of view. As shown in Fig. 3C, all the detected persons are caused to enter in the picture frame by controlling the lens direction and the 25 angle of view.
In addition, as shown in Fig. 3D, the detected person is zoomed up or down at around an arbitrary 207217~
1 location within the picture frame by controlling the lens direction and the angle of view.
Figs. 4A and 4B show the construction of an example of the thermal image detecting means 3 of the invention. 6a to 6e represent pyroelectric type thermal detection elements (hereinafter, called simply as elements), 7 the group of the pyroelectric type thermal detection elements, and 8 the rotation axis. Fig. 4A
shows that the rotation axis 8 is parallel to the pyroelectric type thermal element group 7, and Fig. 4B
shows that the rotation axis 8 is tilted by a constant angle ~ to the pyroelectric type thermal element group 7. The angle ~ depends on the setting of the structure of the main body supporting portion 2 combined with the video camera and the detection field of angle.
The way to obtain a thermal image by use of the pyroelectric type thermal detection element group 7 will be described with reference to Figs. 5A and 5B.
Fig. 5A shows the cubic field angle of view of a thermal image to be detected, and Fig. 5B shows the detected thermal image. The pyroelectric type thermal detection element group 7 includes 5 elements each of which takes charge of 1/5 the angle of view in the vertical direction.
The pyroelectric type thermal detection element group 7 is combined with optical lenses. The horizontal field angle of view is set to be narrow, and it is moved in the horizontal direction by the rotation 207217~
1 of the rotation axis 8. At each movement of the horizontal angle of view, the pyroelectric type thermal detection element group 7 measures temperature to produce a two-dimentional thermal image as shown in 5 Fig. 5B.
The generally used pyroelectric type infrared ray sen~or is of the so-called bulk type using a sintered pyroelectric thick film. However, this bulk type cannot be formed to have a small thermal time constant and thus it has a slow response. If the pyroelectric type thermal detection elements are formed of a pyroelectric thin film of, for example, PbTiO3, the response time can be reduced to about 1/10 that of the bulk type. Use of the elements of this pyroelectric thin film, since the response time can be reduced, makes it possible to precisely detect the movement of human bodies. In addition, use of the pyroelectric thin film makes it possible to further reduce the size of the elements.
According to this invention, since a group of a plurality of pyroelectric type thermal detection elements is provided on the video camera, automatic scanning photographing chiefly for human bodies can be performed by detecting the person or persons. Also, 25 since operatorless photographing is possible, there are no troublesome operations in photographing and thus the freedom of photographing increase~. In addition, since various different functions can be provided on the 1 remote control, the camera operation becomes simpler, and thus any one can easily produce a video drama, news and so on in which the hero or heroine is oneself.
Moreover, according to this invention, the thermal image can be detected by a relatively simple system in which the group of one-dimensionally arranged pyroelectric type thermal detection elements is rotated.
Furthermore, the response speed of the thermal image can be increased by the element group of the pyroelectric thin film, and the system can be small-sized.
_ g _
Claims (10)
1. A video camera system comprising thermal image detecting means formed of a group of a plurality of pyroelectric type thermal detection elements.
2. A video camera system according to claim 1, wherein a video camera main body and a main body supporting portion are connected by lens direction setting means formed of a rotation mechanism of at most 2 axes, and said thermal image detecting means is fixed to said main body supporting portion so as to directly oppose an object being photographed.
3. A video camera system according to claim 2, wherein a person or persons are detected by said thermal image detecting means and human judging means.
4. A video camera system according to claim 3, wherein the location of detected person or persons is decided by human body location detecting means, and lens direction setting means is scanned by picture frame determining means so that said detected person or persons can be fixed to an arbitrary position within a picture frame.
5. A video camera system according to claim 3, wherein said lens direction setting means and lens angle-of-view setting means are scanned in order that when a person is specified, said person can be substantially fixed, at an arbitrary location and to have a certain size, within said picture frame.
6. A video camera system according to claim 3, wherein said human body judging means detects a plurality of persons, and the zoom mechanism of the camera lens is scanned by said lens direction setting means and said lens angle-of-view setting means so that all the persons can be caused to enter in the picture frame.
7. A video camera system according to claim 5, wherein zooming up or down is performed chiefly for said person or persons.
8. A video camera system according to any one of claims 3 to 7, further comprising receiving means, wireless transmission means, and photograph scene setting means together with general operating functions.
9. A video camera system according to claim 1, wherein said pyroelectric type thermal detection element group is made of a pyroelectric thin film.
10. A video camera system according to claim 1, wherein said pyroelectric type thermal detection element group is one-dimensionally arranged in a straight axis and has a rotation axis which is parallel to said straight axis or tilted by a constant angle to said straight axis so that said pyroelectric type thermal detection element group can be rotated around said rotation axis so as to produce a two-dimentional image.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03-151414 | 1991-06-24 | ||
| JP3151414A JPH04373371A (en) | 1991-06-24 | 1991-06-24 | Video camera system with thermal picture detecting means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2072174A1 true CA2072174A1 (en) | 1992-12-25 |
Family
ID=15518092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002072174A Abandoned CA2072174A1 (en) | 1991-06-24 | 1992-06-23 | Video camera system using thermal image detecting means |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH04373371A (en) |
| KR (1) | KR960005483B1 (en) |
| CA (1) | CA2072174A1 (en) |
| DE (1) | DE4220316A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5474085A (en) * | 1994-02-24 | 1995-12-12 | University Of Prince Edward Island | Remote thermographic sensing of livestock |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3379067B2 (en) * | 1994-05-30 | 2003-02-17 | 誠 日向 | Imaging method and apparatus |
| GB2446433B (en) | 2007-02-07 | 2011-11-16 | Hamish Chalmers | Video archival system |
| JP4804398B2 (en) | 2007-03-30 | 2011-11-02 | 三洋電機株式会社 | Imaging apparatus and imaging method |
| JP4806470B2 (en) * | 2011-01-12 | 2011-11-02 | 三洋電機株式会社 | Imaging device |
| CN109151295B (en) * | 2017-06-16 | 2020-04-03 | 杭州海康威视数字技术股份有限公司 | Target object snapshot method and device and video monitoring equipment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2430381B1 (en) * | 1974-06-25 | 1976-01-02 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Arrangement for automatic object tracking by television cameras, in particular television cameras for video telephones |
| DE3432892A1 (en) * | 1984-09-07 | 1986-03-20 | Messerschmitt-Bölkow-Blohm GmbH, 2800 Bremen | ELECTROOPTICAL TARGET |
| DE3447064A1 (en) * | 1984-12-22 | 1986-07-03 | Ebert, Klaus, 5024 Pulheim | Tracking device |
-
1991
- 1991-06-24 JP JP3151414A patent/JPH04373371A/en active Pending
-
1992
- 1992-06-22 DE DE4220316A patent/DE4220316A1/en not_active Withdrawn
- 1992-06-23 CA CA002072174A patent/CA2072174A1/en not_active Abandoned
- 1992-06-23 KR KR1019920010896A patent/KR960005483B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5474085A (en) * | 1994-02-24 | 1995-12-12 | University Of Prince Edward Island | Remote thermographic sensing of livestock |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4220316A1 (en) | 1993-01-14 |
| KR930001699A (en) | 1993-01-16 |
| KR960005483B1 (en) | 1996-04-25 |
| JPH04373371A (en) | 1992-12-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |