1. A vacuum pump comprising:
a cylindrical rotor that constitutes at least a thread groove pump section or a Goethe pump section, etc.; and
a second rotor that connects said cylindrical rotor and a rotating shaft to each other,
the vacuum pump being configured by joining a part of a side surface of said cylindrical rotor to a joint portion that is provided at a flange-like annular portion formed in said second rotor,
wherein an upper end surface of said cylindrical rotor protrudes above a contact portion between said cylindrical rotor and said second rotor.
2. A vacuum pump comprising:
a cylindrical rotor that constitutes at least a thread groove pump section or a Goethe pump section, etc.; and
a second rotor that connects said cylindrical rotor and a rotating shaft to each other,
the vacuum pump being configured by joining a part of a side surface of said cylindrical rotor to a joint portion that is provided at a flange-like annular portion formed in said second rotor,
wherein said joint portion is formed in an L-shape that protrudes below said flange-like annular portion, and an upper end surface of said cylindrical rotor is escaped below said flange-like annular portion.
3. A vacuum pump comprising:
a cylindrical rotor that constitutes at least a thread groove pump section or a Goethe pump section, etc.; and
a second rotor that connects said cylindrical rotor and a rotating shaft to each other,
the vacuum pump being configured by joining a part of a side surface of said cylindrical rotor to a joint portion that is provided at a flange-like annular portion formed in said second rotor,
wherein said joint portion is formed in an L-shape that protrudes above said flange-like annular portion, and an upper end surface of said cylindrical rotor is disposed above said flange-like annular portion.
4. A vacuum pump comprising:
a cylindrical rotor that constitutes at least a thread groove pump section or a Goethe pump section, etc.; and
a second rotor that connects said cylindrical rotor and a rotating shaft to each other,
the vacuum pump being configured by joining a part of a side surface of said cylindrical rotor to a joint portion that is provided at a flange-like annular portion formed in said second rotor,
wherein said joint portion is formed in an L-shape that protrudes below said flange-like annular portion, a small-diameter section is provided at an upper portion of said joint portion,
a contact portion between said cylindrical rotor and said second rotor is escaped below said flange-like annular portion, and an upper end surface of said cylindrical rotor protrudes above said contact portion.
5. The vacuum pump according to claim 1 or 4, wherein a length of a protruding portion of said cylindrical rotor is twice or more a thickness of said cylindrical rotor.
6. The vacuum pump according to claim 1, 2, 3, 4 or 5, wherein said second rotor constitutes a pump mechanism represented by at least a turbo-molecular pump section or a vortex pump section.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. Video surveillance apparatus for monitoring a region illuminated by gas discharge lighting, comprising:
a linescan camera, said linescan camera viewing a vertical line in the monitored region, said linescan camera operating in a time-delay-integration mode with a multitude of light sensitive columns, said linescan camera operating with a line rate; and
a scanner, said scanner sweeping the viewed vertical line horizontally across said monitored region in synchronization with said time-delay-integration mode of said linescan camera;
wherein said line rate is substantially equal to twice the number of said light sensitive columns multiplied by the frequency of the power source driving said gas discharge lighting divided by an integer greater than zero.
2. The video surveillance apparatus as claimed in claim 1 wherein said scanner comprises a mirror mounted on a rotational servo.
3. The video surveillance apparatus as claimed in claim 1 wherein said frequency is from the group consisting of 50 cycles per second and 60 cycles per second.
4. The video surveillance apparatus as claimed in claim 2 wherein said frequency is from the group consisting of 50 cycles per second and 60 cycles per second.
5. The video surveillance apparatus as claimed in claim 1 wherein said number of said light sensitive columns is greater than 8.
6. The video surveillance apparatus as claimed in claim 1 wherein said frequency is 60 cycles per second, said number of said light sensitive columns is 96, said integer is one, and said line rate is substantially 2 times 60 cycles per second times 96 columns divided by 1 equaling 11,520 lines per second.
7. The video surveillance apparatus as claimed in claim 6 wherein said line rate is between 9,216 lines per second and 13,824 lines per second.
8. A method of acquiring a video image of a monitored region illuminated by flickering lighting, comprising:
viewing a vertical line in said monitored region with a TDI linescan camera;
scanning said vertical line horizontally across said monitored region; and
acquiring a sequence of vertical profiles from said TDI linescan camera at a repetition rate, said repetition rate being substantially equal to the number of integrating columns in said TDI camera multiplied by the frequency of said flickering lighting divided by a positive integer.
9. A method of acquiring a video image claimed in claim 8, wherein said scanning consists of rotating a mirror.
10. A method of acquiring a video image claimed in claim 9, wherein said frequency of said flickering lighting is from the group 100 cycles per second and 120 cycles per second.
11. A method of acquiring a video image claimed in claim 8, wherein said number of integrating columns is 96, said frequency of said flickering lighting is 120 cycles per second, said positive integer is 1, and said repetition rate is substantially 96 columns times 60 cycles per second divided by 1 equaling 11,520 lines per second.
12. A method of acquiring a video image claimed in claim 11, wherein said repetition rate is between 9,216 lines per second and 13,824 lines per second.
13. A method of acquiring a video image claimed in claim 8, wherein said frequency of said flickering lighting is from the group 100 cycles per second and 120 cycles per second.