초록 ▼

An image data alteration preventing apparatus according to the present invention comprises recording means for producing first alteration detecting data on the basis of image data, to record the produced first alteration detecting data, together with the image data, on a recording medium, and examin

An image data alteration preventing apparatus according to the present invention comprises recording means for producing first alteration detecting data on the basis of image data, to record the produced first alteration detecting data, together with the image data, on a recording medium, and examining means for producing second alteration detecting data on the basis of the image data read out of the recording medium, and collating the produced second alteration detecting data and the first alteration detecting data read out of the recording medium, to judge whether or not the image data read out of the recording medium is altered.

대표청구항 ▼

An image data alteration preventing apparatus according to the present invention comprises recording means for producing first alteration detecting data on the basis of image data, to record the produced first alteration detecting data, together with the image data, on a recording medium, and examin

An image data alteration preventing apparatus according to the present invention comprises recording means for producing first alteration detecting data on the basis of image data, to record the produced first alteration detecting data, together with the image data, on a recording medium, and examining means for producing second alteration detecting data on the basis of the image data read out of the recording medium, and collating the produced second alteration detecting data and the first alteration detecting data read out of the recording medium, to judge whether or not the image data read out of the recording medium is altered. prises employing side mounting blocks to fix said module in position on said base substrate upon precise mutual alignment of said module and said multiplicity of waveguides. 3. A method according to claim 1 and also comprising producing a fiber optic module including: forming a multiplicity of optical fiber positioning grooves on at least one first substrate; placing each of a multiplicity of optical fibers in each of said multiplicity of optical fiber positioning grooves on said at least one first substrate; retaining each of said multiplicity of optical fibers in each of said multiplicity of optical fiber positioning grooves on said at least one first substrate, such that said multiplicity of optical fibers lie in an optical fiber plane; precisely defining the ends of each said multiplicity of optical fibers so that they all lie substantially in a first predetermined arrangement; fixing a second substrate onto said first substrate such that an edge of said second substrate extends beyond said ends of each of said multiplicity of optical fibers; fixing a lens onto a third substrate; precisely aligning said third substrate in engagement with said edge of said second substrate such that said lens lies in a second predetermined arrangement with respect to said ends of each of said multiplicity of optical fibers; and fixing said third substrate in engagement with said edge of said second substrate such that said lens lies in a second predetermined arrangement with respect to said ends of each of said multiplicity of optical fibers, whereby the separation between said lens and said ends of each of said multiplicity of optical fibers is defined in a plane perpendicular to said optical fiber plane to a first degree of accuracy and the separation between said lens and said ends of each of said multiplicity of optical fibers is defined in said optical fiber plane to a second degree of accuracy, less than said first degree of accuracy. 4. A method according to claim 2, and also comprising producing a fiber optic module including: forming a multiplicity of optical fiber positioning grooves on at least one first substrate; placing each of a multiplicity of optical fibers in each of said multiplicity of optical fiber positioning grooves on said at least one first substrate; retaining each of said multiplicity of optical fibers in each of said multiplicity of optical fiber positioning grooves on said at least one first substrate, such that said multiplicity of optical fibers lie in an optical fiber plane; precisely defining the end of each of said multiplicity of optical fibers so that they all lie substantially in a first predetermined arrangement; fixing a second substrate onto said first substrate such that an edge of said second substrate extends beyond said ends of each of said multiplicity of optical fibers; fixing a lens onto a third substrate; precisely aligning said third substrate in engagement with said edge of said second substrate such that said lens lies in a second predetermined arrangement with respect to said ends of each of said multiplicity of optical fibers; and fixing said third substrate in engagement with said edge of said second substrate such that said lens lies in a second predetermined arrangement with respect to said ends of each of said multiplicity of optical fibers, whereby the separation between said lens and said ends of each of said multiplicity of optical fibers is defined in a plan perpendicular to said optical fiber plane to a first degree of accuracy and the separation between said lens and said ends of each of said multiplicity of optical fibers is defined in said optical fiber plane to a second degree of accuracy, less than said first degree of accuracy. 5. A method according to claim 1 and wherein said optical mode modifying lens comprises a cylindrical lens. 6. A method according to claim 1 and wherein said optical mode modifying lens is operative to couple light from said at least one of said multiplicity of optical fiber ends to at least one of said multiplicity of waveguides. 7. A method according to claim 6 and wherein said lens is fixed onto said base substrate by means of side mounting blocks thereby to preserve precise mutual alignment of said at least one lens and said at least one waveguide. 8. A method according to claim 6 and wherein said optical mode modifying lens is operative to couple light from a first number of fibers to a greater number of waveguides. 9. A method according to claim 6 and wherein said optical mode modifying lens is operative to couple light from a first number of fibers to an identical number of waveguides. 10. A method according to claim 8 and wherein said first number of fibers comprises at least two fibers. 11. A method according to claim 9 and wherein said first number of fibers comprises at least two fibers. 12. A method according to claim 6 and wherein said gallium arsenide substrate is a light deflector. 13. A method according to claim 6 and also comprising receiving light from at least one of said multiplicity of waveguides into output optics and wherein said output optics include at least one output fiber. 14. A method according to claim 13 and wherein said output optics includes at least one lens fixed onto said base substrate by means of side mounting blocks thereby to preserve precise mutual alignment of said at least one lens and at least one of said multiplicity of waveguides. 15. A method according to claim 14 and wherein said at least one gallium arsenide substrate is a light deflector. 16. A method according to claim 13 and wherein said output optics include at least one lens receiving light from multiple ones of said multiplicity of waveguides. 17. A method according to claim 13 and wherein said multiplicity of waveguides are formed on a plurality of gallium arsenide substrates and wherein said output optics include at least one lens receiving light from waveguides formed on multiple ones of said plurality of optical substrates. 18. A method according to claim 17 and wherein at least one of said plurality of gallium arsenide substrates is a light deflector. 19. A method according to claim 18 and wherein said output optics include at least one lens fixed onto said base substrate by means of side mounting blocks thereby to preserve precise mutual alignment of said at least one lens and at least one of said multiplicity of waveguides. 20. A method according to claim 3 and wherein said lens comprises a cylindrical lens. 21. A method according to claim 20 and wherein said at least one gallium arsenide substrate is a light deflector. 22. A method according to claim 3 and also comprising receiving light from at least one of said multiplicity of waveguides into output optics and wherein said output optics include at least one output fiber. 23. A method according to claim 22 and wherein said output optics includes at least one lens fixed onto said base substrate by means of side mounting blocks thereby to preserve precise mutual alignment of said at least one lens and said at least one waveguide. 24. A method according to claim 23 and wherein said at least one gallium arsenide substrate is a light deflector. 25. A method according to claim 22 and wherein said output optics include at least one lens receiving light from multiple ones of said multiplicity of waveguides. 26. A method according to claim 22 and wherein said multiplicity of waveguides are formed on a plurality of gallium arsenide substrates and wherein said output optics include at least one lens receiving light from waveguides formed on multiple ones of said plurality of optical substrates. 27. A method according to claim 26 and wherein said at least one optical substrate is a light deflector. 28. A method according to claim 27 and wherein said output optics includes at least one lens fixed onto said bas substrate by means of side mounting blocks thereby to preserve precise mutual alignment