Two dimensional laser diode array

• US 4,743,091 A
• Filed: 10/30/1986
• Issued: 05/10/1988
• Est. Priority Date: 10/30/1986
• Status: Expired due to Term

• Current Assignee: Creo Products Incorporated
• Original Assignee: Daniel Gelbart
• Inventors: Gelbart, Daniel
• Primary Examiner(s): Corbin, John K.
• Assistant Examiner(s): Ben, Loha
• Application Number:
  US06/924,975
• Time in Patent Office: 558 Days
• Field of Search: 350/252, 350/169, 350/174, 350/247, 350/255, 350/6.5-6.8, 350/96.25-96.27, 340/782, 362/800
• US Class Current: 369/112.24
• CPC Class Codes: G11B 7/125 Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
• CPC Class Codes: G11B 7/14 specially adapted to record on, or to reproduce from, more than one track simultaneously

Abstract

A two dimensional laser diode array is disclosed for use in optical data storage consisting of rows and columns of individual lasers diodes, each one having a separate collimating lens. The array is imaged down onto an optical recording medium which is moving relative to the image of the array in order to generate scanning. The diodes in the array are staggered in the direction perpendicular to the scanning direction to achieve an apparent spacing lower than the actual spacing.

Claims

1. An optical system for recording information on the surface of a light sensitive medium comprising:

a two-dimentional array of laser diodes mounted on a curved substrate and arranged in such a way to converge laser beams of said laser diodes onto an intermediate lens, each laser diode having a separate collimating lens in optical alignment therewith, said collimating lens collecting most of the emitted light from said laser diode;

a lens for imaging said array of laser diodes onto said light sensitive surface;

one or more intermediate lenses placed between said imaging lens and said array of laser diodes in order to reduce the image size, and a means for adjusting the position of each laser diode relative to said collimating lens to deliver a substantial amount of the emitted light from each laser diode to the surface of said medium.

2. An optical system as in claim 1 wherein said array of laser diodes comprises a plurality of rows and columns of said laser diodes, each one of said rows being offset relative to the previous row in the direction of the rows by an amount less than the spacing of the columns.

3. An optical system as in claim 2 wherein number of rows and columns is larger than 2 and smaller than 10.

4. An optical system as in claim 1 using reflective optics instead of at least one of said imaging and intermediate lenses.