| 摘要 |
PURPOSE: A super-thin short-focus lens is provided to allow aberration correction for optical beam to be easily performed, while minimizing influence from surroundings by integrating iris into the lens. CONSTITUTION: A lens comprises a first lens(22) formed into an aspheric lens having a negative refractive power, and which corrects the coma aberration of the optical beam incident from an external source; a second lens(24) having both sides formed into an aspheric lens with a positive refractive power, and which corrects the aberration of the optical beam incident from the first lens; an iris(34) interposed between the first lens and the second lens so as to adjust the optical beam; a third lens(26) formed into a spherical lens having a negative refractive power, and which is formed into an aspheric lens so as to allow incidence of optical beam from the second lens; and a fourth lens(28) formed into a spherical lens having a positive refractive power, and which cooperates with the third lens to correct the chromatic aberration of the optical beam incident from the second lens.
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