LIGHT-EMITTING ELEMENT ARRAY WITH MICRO-LENSES AND OPTICAL WRITING HEAD

• US 20100001296A1
• Filed: 02/21/2007
• Published: 01/07/2010
• Est. Priority Date: 04/04/2006
• Status: Active Grant

• Current Assignee: Fujifilm Business Innovation Corp. (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Inventors: Hashimoto, Takahiro, Hamanaka, Kenjiro
• Granted Patent: US 8,089,077 B2
• Time in Patent Office: Days
• US Class Current: 257/88
• CPC Class Codes: B41J 2/451 Special optical means therefor, e.g. lenses, mirrors, focusing means
• CPC Class Codes: H01L 2224/48463 the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond
• CPC Class Codes: H01L 2224/4847 the connecting portion on the bonding area of the semiconductor or solid-state body being a wedge bond
• CPC Class Codes: Y10S 257/91 Diode arrays, e.g. diode read-only memory array
• CPC Class Codes: Y10S 257/911 Light sensitive array adapted to be scanned by electron beam, e.g. vidicon device
• CPC Class Codes: Y10S 257/918 Light emitting regenerative switching device, e.g. light emitting scr arrays, circuitry

Abstract

A light-emitting element array with the improvement of the light-emitting efficiency and the improvement of the uneven amount of light is provided.

A light-emitting element array comprises a light-emitting portion array consisting of a plurality of light-emitting portions linearly arranged in a main scanning direction, and a micro-lens formed on each of the light-emitting portions, wherein the micro-lens has a shape of the length of a sub-scanning direction different from the length of the main scanning direction, and the length of the sub-scanning direction is longer than the length of the main scanning direction, and is 3.5 times or less of the length of the main scanning direction.

Claims

1-23. -23. (canceled)

24. A light-emitting element array, which has a structure in which a plurality of light-emitting element array chips are arranged in staggered manner, comprising the plurality of light emitting element array chip each including:

a light-emitting portion array consisting of a plurality of light-emitting portions linearly arranged in a main scanning direction; and

a micro-lens formed on each of the light-emitting portions,

wherein the light-emitting element array includes a plurality of light-emitting element array chips, and

each light-emitting element array chip includes on the surface of each chip a bonding pad, which feeds the power of the light-emitting portions through a wire, and a resin pattern, and

the resin pattern comprises the micro-lenses, and resin surface located in the surrounding of the micro-lenses, and a stray-light prevention wall for preventing a light being entered from a light-emitting portion on one chip to the wire of the bonding pad on the other pad on the other chip.

25. A light-emitting element array according to claim 24, wherein the area that both the stray-light prevention wall and the resin surface occupy is larger than the area that the micro-lenses occupy.

26. A light-emitting element array according to claim 24, wherein the stray-light prevention wall is formed with a shape of a lenticular lens or as a same shape of the micro-lens.

27. A light-emitting element array according to claim 24, wherein the light-emitting elements array is the self-scanning light-emitting element array.

28. A light-emitting element array according to claim 24, wherein the light-emitting portion is a light-emitting diode or a light-emitting thyristor.

29. An optical writing head comprising the light-emitting elements array as claimed in claim 24.

30. An optical printer comprising the optical writing head as claimed in claim 29.

31. A facsimile comprising the optical writing head as claimed in claim 29.

32. An electro-photographic apparatus comprising the optical writing head as claimed in claim 29.