1-42. (canceled)
43. A portable integrated welder, generator and compressor unit comprising:
a. a housing that at least partially contains components of said welder, generator and compressor;
b. an engine at least partially mounted in said housing;
c. an electric current generator at least partially mounted in said housing and connected or interconnected to said engine to be at least partially driven thereby; and,
d. an air compressor at least partially mounted in said housing, said air compressor at least partially driven by said engine or said electric current generator by use of a beltless drive connector, said beltless drive connector including a gear box having at least one gear.
44. The unit as defined in claim 43, including an air accumulator tank at least partially mounted in said housing, said air accumulator is fluidly connected to said air compressor.
45. The unit as defined in claim 43, including a pressure monitor at least partially mounted on said housing to monitor air pressure generated by said air compressor.
46. The unit as defined in claim 44, including a pressure monitor at least partially mounted on said housing to monitor air pressure generated by said air compressor, contained in said air accumulator or combinations thereof.
47. The unit as defined in claim 43, wherein said housing includes at least one electrical outlet for use by welding equipment and at least one air outlet for use by air powered tools.
48. The unit as defined in claim 43, wherein said gear box connects said air compressor to said engine.
49. The unit as defined in claim 43, wherein said gear box connects said air compressor to said electric current generator.
50. The unit as defined in claim 43, wherein said gear box includes a plurality of gears, said gear box having a single gear ratio.
51. The unit as defined in claim 43, wherein said gear box includes a plurality of gears, said gear box having a single gear ratio.
52. The unit as defined in claim 51, wherein said gear box includes a plurality of gear ratios, said gear ratios are manually selectable.
53. The unit as defined in claim 51, wherein said gear box includes a plurality of gear ratios, said gear ratios are automatically selectable.
54. A method of providing compressed air from a portable integrated welder, generator and compressor unit comprising:
a. providing a housing that at least partially contains an engine at least partially mounted in said housing;
b. providing an electric current generator that is at least partially mounted in said housing and connected or interconnected to said engine to be at least partially driven thereby; and,
c. providing an air compressor at least partially mounted in said housing, said air compressor at least partially driven by said engine or said electric current generator by use of a beltless drive connector, said beltless drive connector including a gear box having at least one gear.
55. The method as defined in claim 54, including the step of providing an air accumulator tank that is at least partially mounted in said housing, said air accumulator is fluidly connected to said air compressor to at least partially accumulate compressed air generated by said air compressor.
56. The method as defined in claim 54, including the step of providing a pressure monitor at least partially mounted on said housing, said pressure monitor at least partially monitoring air pressure generated by said air compressor.
57. The method as defined in claim 55, including the step of providing a pressure monitor at least partially mounted on said housing, said pressure monitor at least partially monitoring air pressure generated by said air compressor, contained in said air accumulator, or combinations thereof.
58. The method as defined in claim 54, wherein said gear box connects said air compressor to said engine.
59. The method as defined in claim 54, wherein said gear box connects said air compressor to said electric current generator.
60. The method as defined in claim 54, wherein said gear box includes a plurality of gears, said gear box having a single gear ratio.
61. The method as defined in claim 60, wherein said gear box includes a plurality of gear ratios, said gear ratios are manually selectable.
62. The method as defined in claim 60, wherein said gear box includes a plurality of gear ratios, said gear ratios are automatically selectable.
63. The method as defined in claim 54, including the step of including at least one electrical outlet on said housing for use by welding equipment and at least one air outlet for use by air powered tools.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1-9. (canceled)
10. An optical recordingreproducing apparatus, which recordsreproduces information onfrom a recording medium having a single recording layer and a recording medium having recording layers the number of which is represented by N (N\u22672) by converging light rays from a light source thereon, comprising:
an objective lens for converging light rays from the light source onto the recording medium; and
a spherical-aberration correcting mechanism for correcting spherical aberration of converged light spots formed on the recording layers of both the recording medium having the single recording layer and the recording medium having the recording layers the number of which is represented by N (N\u22672), wherein
the objective lens is set so that a converged light spot, derived from light rays transmitted through a light-transmitting body having an optical thickness of p4 and converged, has a small spherical aberration,
the recording medium having the recording layers the number of which is represented by N (N\u22672) includes a first recording layer, . . . , an N-th recording layer in succession from the objective lens side,
an optical thickness at a mid-point between the first recording layer and the N-th recording layer is represented by p3,
p4 and p3 are coincident with each other,
a converged light spot formed at the mid-point between the first recording layer and the N-th recording layer by the objective lens has a minimum spherical aberration when light rays emitted from the spherical-aberration correcting mechanism have a minimum spherical aberration,
an optical thickness of the recording medium having the single recording layer is represented by p5, and
p3 and p5 are coincident with each other.