Patent Number: 
Section: claims

1. A pattern inspection method for detecting a defect on a semiconductor device comprising:irradiating a beam to a plurality of dies to be inspected on the semiconductor wafer, the plurality of dies being selected arbitrarily in sequence,forming a first image of the plurality of dies to be inspected and a second image of the plurality of dies as reference dies according to an order of the sequence based on signals generated from an irradiation point of the beam,comparing the first image and the second image,detecting a difference between the first image and the second image, anddetermining whether there is a defect in the plurality of dies to be inspected or in the reference dies based on the difference detected. 2. A circuit-pattern inspection apparatus comprising:a beam source,a detector for detecting signals obtained from beam irradiation of a part of a specimen,a memory for storing the signals as an image,an operation unit for selecting an inspection die row scanned in sequence so that a die to be inspected and a separate reference die are consecutive in the sequence, anda processing unit for comparing images of one of the inspection die row stored in the memory with a reference image of one of the separate reference die stored in the memory, comparing images of another of the inspection die row stored in the memory with a reference image of another of the separate reference die stored in the memory, and for identifying defects on the die of the inspection die row. 3. The circuit-pattern inspection apparatus according to claim 2, wherein the operation unit for arbitrarily selecting a die to be inspected and the reference die which is not adjacent to any side of the die to be inspected,a computer program product for controlling a circuit-pattern inspection apparatus comprising a beam source, a detector for detecting signals obtained from beam irradiation of a part of a specimen, a memory for storing the signals as an image. 4. A program product for controlling a circuit-pattern inspection apparatus comprising a beam source, a detector for detecting signals obtained from a beam irradiation of a part of a specimen, a memory for storing the signals as an image, and an operation unit for selecting a plurality of dies in sequence to be inspected on a semiconductor wafer, the product comprising: executable code embodied in a readable medium, the executable code causing the apparatus to perform a sequence of steps comprising:(a) irradiating a beam to a plurality of dies to be inspected according to an order of the sequence,(b) forming a first image of the plurality of dies to be inspected and a second image of the plurality of dies as reference dies according to the order of the sequence based on signals generated from an irradiation point of the beam,(c) comparing the first image and the second image, and(d) detecting a difference between the first image and the second image. 5. A circuit-pattern inspection apparatus comprising:a beam source;a detector for detecting signals obtained from beam irradiation of a part of a specimen;a memory for storing the signals as one or more images;an operation unit for arbitrarily selecting a plurality of dies in sequence to be inspected and storing images of the plurality of dies in memory, anda processing unit for comparing between images of the plurality of dies stored in the memory according to an order of the sequence, and for deteting defects on the plurality of dies to be inspected based on a result of the comparison. 6. The circuit-pattern inspection apparatus according to claim 5, wherein the operation unit sets the plurality of dies only in the circumferencial part of the specimen to be compared at a time. 7. The circuit-pattern inspection apparatus according to claim 5, wherein the beam source is a charged particle beam source and the detector is an electron detector for detecting electrons emitted from the specimen. 8. The circuit-pattern inspection apparatus according to claim 5, wherein the beam source is a light source and the detector is a light detector for detecting a reflection beam reflected from the specimen. 9. The circuit-pattern inspection apparatus according to claim 5, further comprising: a stage for moving the specimen, the stage being controlled by the processing unit. 10. The circuit-pattern inspection apparatus according to claim 9, wherein the processing unit controls the stage according to a selecting of the plurality of dies to be inspected by the operation unit to move ihe plurality of dies to be inspected to an irradiation point of the beam. 11. The circuit-pattern inspection apparatus according to claim 5, wherein the operation unit enables changing of an inspection order of the dies to be inspected after the setting the inspection order. 12. The circuit-pattern inspection apparatus according to claim 5, wherein the operation unit can add or delete a die to be inspected after selecting the dies to be inspected.