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Line head and image forming apparatus using the same

A line head and image side technology applied in the field of image forming devices

Inactive Publication Date: 2011-05-18
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In addition, in the case of arranging a plurality of light-emitting point arrays in parallel in the sub-scanning direction, when the lens diameter of the optical system increases, the optical writing line head will The width of the image forming apparatus is increased, and it is difficult to miniaturize the image forming apparatus

Method used

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  • Line head and image forming apparatus using the same
  • Line head and image forming apparatus using the same
  • Line head and image forming apparatus using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0215] r 5 =0.9310 d 5 =0.4000 n d2 =1.5168 υ d2 =64.2 r 6 =—6.1348d 6 =0.8000 r 7 =∞(image plane)

[0216] Use wavelength 632.5nm

[0217] Image side aperture angle (half angle) θ i 0.1745rad(10deg)

[0218] Number of lens columns m 3

[0219] The interval α between the effective areas of the second lens is 0.1mm or more

[0220] Distance S from the main surface on the image side of the second lens to the image surface i 1.0337mm

[0221] Horizontal magnification β — 0.5

[0222] Light source pixel group full width W o 0.700mm

[0223] Full width of image pixel group W i 0.350mm

[0224] (When substituting into formula (24), W i ≥0.2304mm)

[0225] Second lens focal length f 2 1.6mm

[0226] (When substituting into formula (24), f 2 ≤2.722mm)

[0227] The effective diameter of the first lens (twice the height of the maximum ray passing through the lens for real ray tracing) D 1 0.778mm

[0228] Aperture stop diameter 0.547mm

[0229] The effectiv...

Embodiment 2

[0233] r 5 =0.9310d 5 =0.4000n d2 =1.5168 υ d2 =64.2 r 6 =—6.1348d 6 =0.8000 r 7 =∞(image plane)

[0234] Use wavelength 632.5nm

[0235] Image side aperture angle (half angle) θ i 0.1745rad(10deg)

[0236] Number of lens columns m 3

[0237] The interval α between the effective areas of the second lens is 0.1 mm or more

[0238] Distance S from the main surface on the image side of the second lens to the image surface i 1.0337mm

[0239] Horizontal magnification β — 0.5

[0240] Light source pixel group full width W o 0.700mm

[0241] Full width of image pixel group W i 0.350mm

[0242] (When substituting into formula (24), W i ≥0.2304mm)

[0243] Second lens focal length f 2 1.6mm

[0244] (When substituting into formula (24), f 2 ≤2.722mm)

[0245] The effective diameter of the first lens (twice the height of the maximum ray passing through the lens for real ray tracing) D 1 0.609mm

[0246] Aperture stop diameter 0.542mm

[0247] The effective diam...

Embodiment 3

[0251] r 5 =0.9310d 5 =0.4000 n d2 =1.5168 υ d2 =64.2 r 6 =—6.1348d 6 =0.8000 r 7 =∞(image plane)

[0252] Use wavelength 632.5nm

[0253] Image side aperture angle (half angle) θ i 0.1745rad (10deg)

[0254] Number of lens columns m 3

[0255] The interval α between the effective areas of the second lens is 0.1 mm or more

[0256] Distance S from the main surface on the image side of the second lens to the image surface i 1.0337mm

[0257] Horizontal magnification β — 0.5

[0258] Light source pixel group full width W o0.700mm

[0259] Full width of image pixel group W i 0.350mm

[0260] (When substituting into formula (24), W i ≥0.2304mm)

[0261] Second lens focal length f 2 1.6mm

[0262] (When substituting into formula (24), f 2 ≤2.722mm)

[0263] The effective diameter of the first lens (twice the height of the maximum ray passing through the lens for real ray tracing) D 1 0.580mm

[0264] Aperture stop diameter 0.542mm

[0265] The effective di...

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Abstract

The invention provides a line head and a image forming device using the line head, which make diameter of a positive lens system of a light write-in line head formed by a plurality of row-type luminescence components according to each corresponding way of a plurality of positive lens system arranged in matrix type small. Luminous body of luminescence component rows including more than one rows generated by row-type arranging a plurality of luminescence components along main scan direction are separated at the main scan direction to a plurality of groups to form a luminous body array (1), a lens array is arranged at emission side of the luminous body array (1) according to a way of respectively regularly arranging a positive lens system (5) corresponding to each luminous body group, a write-in surface (41) is arranged at imaging side of the lens array, each positive lens system (5) composing the lens array is composted of two lens groups (L1, L2) of positive refraction force, a hole diameter diaphragm (11) is arranged between the two lens groups and becomes approximately telecentric at imaging side, focus distance of the image side lens (L2) and width of luminescence component image group of the write-in surface (41) along the main scan direction satisfy condition formulas (21) and (24).

Description

technical field [0001] The present invention relates to a line head and an image forming device using the line head, in particular to a line head using a microlens array to project light-emitting element columns on an irradiated surface to form imaging dot columns and an image forming device using the line head. Background technique [0002] Currently, Patent Document 1 proposes a line head for optical writing as follows and a line head for optical reading by reversing its optical path: a plurality of LED array chips are arranged in the direction of the LED array, and each LED array is connected by a corresponding positive lens. The LED array of the chip is enlarged and projected on the photoreceptor, and the images of the light-emitting points at the ends of adjacent LED array chips on the photoreceptor are contiguously imaged at the same pitch as the image pitch of the light-emitting points of the same LED array chip. [0003] In addition to the arrangement in Patent Docum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/04G03G15/32B41J2/45G03G15/01
Inventor 宗和健野村雄二郎小泉龙太
Owner SEIKO EPSON CORP