US4974736A — Multi-electron-beam pattern drawing apparatus

Claim 1

Independent Claim 88 words

A charged-particle beam apparatus for drawing a pattern on a workpiece having a radiation sensitive material, said apparatus comprising: a plurality of charged-particle beam sources provided on a common base member; and controlling means for selectively controlling said charged-particle beam sources so that at least one of said charged-particle beam sources is used only for pattern drawing while at least one other charged-particle beam source is used only for alignment of said charged-particle sources and a region of the workpiece in which the pattern is to be drawn.

Claim 2

Dependent Claim 88 words

A charged-particle beam apparatus for drawing a pattern on a workpiece having a radiation sensitive material, said apparatus comprising: a plurality of charged-particle beam sources provided on a common base member; and controlling means for selectively controlling said charged-particle beam sources so that at least one of said charged-particle beam sources is used only for pattern drawing while at least one other charged-particle beam source is used only for alignment of said charged-particle sources and a region of the workpiece in which the pattern is to be drawn.

Claim 3

Dependent Claim 31 words

An apparatus according to claim 1, wherein each of said charged-particle beam sources comprises an electron emitting element of a type wherein emission of electrons from a cold cathode is used.

Claim 4

Dependent Claim 45 words

An apparatus according to claim 1, further comprising means for detecting at least one of secondary electrons and reflected electrons produced by impingement of a charged-particle beam to the workpiece, wherein the alignment is made on the basis of the detection by said detecting means.

Claim 5

Dependent Claim 47 words

An apparatus according to claim 3, wherein at least two of said charged-particle beam sources are controlled by said controlling means only for the alignment, and wherein said at least two charged-particle beam sources are controlled so as to produce charged-particle beams in a time series manner.

Claim 6

Dependent Claim 87 words

A charged-particle beam producing apparatus comprising: a charged-particle beam producing source comprising a vacuum partition wall, wherein said vacuum partition wall has a multi-chamber structure wherein the degree of vacuum can be increased stepwise; driving means for driving said charged-particle beam producing source; detecting means provided on said vacuum partition wall, for detecting at least one of secondary charged-particles and reflected charged-particles, wherein said detecting means is disposed in an innermost portion wherein the degree of vacuum is highest; and control means for controlling the charged-particle beam.

Claim 7

Dependent Claim 87 words

A charged-particle beam producing apparatus comprising: a charged-particle beam producing source comprising a vacuum partition wall, wherein said vacuum partition wall has a multi-chamber structure wherein the degree of vacuum can be increased stepwise; driving means for driving said charged-particle beam producing source; detecting means provided on said vacuum partition wall, for detecting at least one of secondary charged-particles and reflected charged-particles, wherein said detecting means is disposed in an innermost portion wherein the degree of vacuum is highest; and control means for controlling the charged-particle beam.

Claim 8

Dependent Claim 14 words

An apparatus according to claim 5, wherein said detecting means comprises a p-n junction.

Claim 9

Dependent Claim 21 words

An apparatus according to claim 5, wherein a plurality of charged-particle beam producing sources are provided on a common base member.

Claim 10

Dependent Claim 19 words

An apparatus according to claim 7, wherein said plural charged-particle beam producing sources are selectively driven for different uses.

Claim 11

Dependent Claim 136 words

A charged-particle beam apparatus for drawing a pattern on a workpiece having a radiation sensitive material in accordance with prepared pattern data, said apparatus comprising: a plurality of charged-particle beam sources provided in a unidirectional array on a common base plate, wherein said charged-particle beam sources include beam emitting portions, each of a width d, which are disposed at a pitch D; moving means for relatively moving the workpiece and said base plate in a direction of an angle θ with respect to the array of said charged-particle beam sources, wherein θ=sin -1 (d/kD) where k≧1; and timing controlling means for controlling the timing of emission of charged-particle beams emitted from said beam emitting portions in accordance with the pattern data and with the speed of the relative movement of the workpiece and the base plate.

Claim 12

Dependent Claim 136 words

A charged-particle beam apparatus for drawing a pattern on a workpiece having a radiation sensitive material in accordance with prepared pattern data, said apparatus comprising: a plurality of charged-particle beam sources provided in a unidirectional array on a common base plate, wherein said charged-particle beam sources include beam emitting portions, each of a width d, which are disposed at a pitch D; moving means for relatively moving the workpiece and said base plate in a direction of an angle θ with respect to the array of said charged-particle beam sources, wherein θ=sin -1 (d/kD) where k≧1; and timing controlling means for controlling the timing of emission of charged-particle beams emitted from said beam emitting portions in accordance with the pattern data and with the speed of the relative movement of the workpiece and the base plate.

Claim 13

Dependent Claim 30 words

An apparatus according to claim 9, wherein each of said beam emitting portions has a square shape having one side which is substantially parallel to the direction of relative movement.

Claim 14

Dependent Claim 21 words

An apparatus according to claim 9, wherein the following relation is satisfied: ##EQU6## wherein l is an integral number and k≧1.

Claim 15

Dependent Claim 34 words

An apparatus according to claim 9, wherein the following relation is satisfied: t=d/kv where t is a clockpulse for controlling said timing and v is the speed of the relative movement and wherein k≧1.

Claim 16

Dependent Claim 21 words

An apparatus according to claim 9, wherein said charged-particle beam sources are disposed in arrays which are parallel to each other.

Claim 17

Dependent Claim 71 words

An apparatus according to claim 9, wherein said base plate is provided with a light emitting portion and a light receiving line sensor and wherein the light emitted from said light emitting portion is reflected by a plane parallel to a reference plane, representing the orientation of the workpiece, the reflected light being received by said light being received by said line sensor, whereby the attitude of the workpiece is detected.

Claim 18

Dependent Claim 54 words

An apparatus according to claim 9, wherein the array of charged-particle beam sources are disposed so that a line drawn by at least one beam source of one beam source array and a line, or an extension thereof, drawn by at least one beam source of another beam source array superpose upon one another.

Claim 19

Dependent Claim 40 words

An apparatus according to claim 9, further comprising magnification changing means effective to adjust at least one of the angle and said electron beam emission timing and the speed of the relative movement, to thereby change the pattern drawing magnification.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-12-03	1994-06-04	1994-12-04	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-12-03	1998-06-04	1998-12-04	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-12-03	2002-06-04	2002-12-04	$7700.00	Window Closed / Lapsed

Multi-electron-beam pattern drawing apparatus

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