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Light emitting element array with micro-lens and optical writing head

A technology for light-emitting elements and micro-lenses, which is applied to electrical components, electric solid-state devices, semiconductor devices, etc., can solve the problems of increasing the burden on the driver IC, increasing the driving current, hindering cost reduction, etc., and achieves improved luminous efficiency and light transmission. High rate and high-speed effect

Active Publication Date: 2009-05-27
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0034] In view of this situation, increasing the size of the light-emitting portion itself in the sub-scanning direction can also be considered as a solution, but since the driving current also increases when the light-emitting portion is enlarged, the above-mentioned problem cannot be solved.
That is, it leads to an increase in power consumption, an increase in the burden on the driver IC, and also hinders cost reduction

Method used

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  • Light emitting element array with micro-lens and optical writing head
  • Light emitting element array with micro-lens and optical writing head
  • Light emitting element array with micro-lens and optical writing head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] in accordance with the reference image 3 In the prior art described above, when a microlens with a length of 20 μm in the array direction and a length of 20 μm in the sub-scanning direction is formed, the total amount of light at the condensing point on the photosensitive drum becomes 1.5 times.

[0079] On the other hand, according to Embodiment 1, the light quantity can be further increased by increasing the size of the microlens provided on the light emitting portion in the sub-scanning direction.

[0080] A method for increasing the size of the microlens in the sub-scanning direction will be described below. First, use the Figure 20 The shape of the mask opening of a photomask used to make a lens master as described in the prior art. Next, if Figure 19 In (A), a Cr film is formed on a quartz glass substrate, and a mask opening shape is patterned using a photolithography technique, and this is etched using hydrofluoric acid. After the predetermined etching ti...

Embodiment 2

[0089] figure 2 Another example of microlenses formed on each light emitting portion of an SLED chip for 1200 dpi (pitch 21.2 μm) is shown. figure 2 The microlenses in the photogram were formed with a length of 21.2 μm in the main scanning direction and a length of 34 μm in the sub-scanning direction. Condensed spot shape 84d on the photosensitive drum of the optical writing head equipped with this microlens 3 ,use figure 2 The dotted line indicates. About Spotlight 84d 3 The entire width of , is 18 μm in the main scanning direction, and 29 μm in the sub-scanning direction. The total amount of light at the condensed point on the photosensitive drum is 2.1 times that of the case without the microlens. exist figure 2 In the figure, in order to understand the shape of the compound lens 30b, an X-X' line sectional view and a Y-Y' line sectional view are shown. If microlenses are formed according to the above-mentioned steps, then about the X-X' line sectional view and t...

Embodiment 3

[0100] In Embodiments 1 and 2, the microlens of the compound lens was described, but it is also possible to change Figure 20 The shape of the etching mask forms the shape of microlenses of various shapes. 5A to 5C show types of shapes of microlenses other than compound lenses. Fig. 5 A is the microlens plan view when having used spherical lens 30c, Fig. 5 B is the microlens plan view when having used oval lens 30d, Fig. 5 C has used the oval lens that has cylindrical surface between 2 semicircular lenses Microlens plan view at 30e. In FIGS. 5A to 5C , the same reference numerals are given to the same elements for convenience of description.

[0101] FIG. 5A shows a diagram in which the intersection point of the axis a in the sub-scanning direction and the axis b in the main scanning direction (that is, the center of gravity Osp of the lens) coincides with the center Op of the circumscribed circle of the light emitting unit 84 . Additionally, according to Figure 19 In the f...

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Abstract

A light emitting element array is provided with features of improvement in light-emitting efficiency and reduction of dispersion in light quantity. A light emitting element array is comprised of a light emitting unit line including a plurality of light emitting units linearly disposed in a primary scanning direction, and a micro-lens formed on the light emitting units, wherein the length in the primary scanning direction of the micro-lens is different from that in a sub-scanning direction, and the latter is longer than the former while the latter is not more than 3.5 times the former in shape.

Description

technical field [0001] The present invention relates to a light-emitting element array and an optical writing head, and particularly relates to a light-emitting element array with microlenses for increasing light quantity. Background technique [0002] It is known that a light-emitting element array and an optical writing head are used as a light source for exposing light to a photosensitive drum included in an optical printer, facsimile, or copier (for example, Patent Document 1). FIG. 25 shows a schematic diagram of an optical printer equipped with an optical writing head. On the surface of the cylindrical photosensitive drum 102, a material (photosensitive body) having photoconductivity such as amorphous Si is formed. The drum rotates at the speed of printing. The surface of the photoreceptor on the rotating drum is uniformly charged by the charger 104 . Then, the light of the dot image to be printed is irradiated onto the photoreceptor using the optical writing head 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/00B41J2/44B41J2/45B41J2/455H01L33/58H01L33/62
CPCB41J2/451H01L2224/48463H01L2224/4847Y10S257/91Y10S257/918Y10S257/911
Inventor 浜中贤二郎桥本隆宽
Owner FUJIFILM BUSINESS INNOVATION CORP