Title:
屈折率分布型レンズ、ロッドレンズアレイ、イメージスキャナ、プリンタ、及び検査装置
Document Type and Number:
Japanese Patent JP7308171
Kind Code:
B2
Abstract:
To provide a gradient index lens having a large depth of field.SOLUTION: A gradient index lens (1b) has a depth of field of 1.5-3.0 mm. The depth of field is determined by subtracting the minimum value of an actuation distance from its maximum value. In the actuation distance, a value of a modulation transfer function (MTF) in a spatial frequency of 6/mm is 30% or more.SELECTED DRAWING: Figure 1
Inventors:
Hiroaki Kato
Satoshi Taniguchi
Norifumi Kaneko
Takeshi Yamane
Kenichi Sato
Tomotaka Takagi
Satoshi Taniguchi
Norifumi Kaneko
Takeshi Yamane
Kenichi Sato
Tomotaka Takagi
Application Number:
JP2020076111A
Publication Date:
July 13, 2023
Filing Date:
April 22, 2020
Export Citation:
Assignee:
NIPPON SHEET GLASS COMPANY,LIMITED
International Classes:
G02B3/00; C03C3/078; C03C3/085; C03C3/087; C03C3/089; C03C3/093; C03C3/095; C03C3/097; C03C21/00
Domestic Patent References:
| JP2001174606A | ||||
| JP6276359A | ||||
| JP2000155224A | ||||
| JP2000035519A | ||||
| JP2013036908A |
Attorney, Agent or Firm:
Koichi Kamada
Mitsuhiko Nishio
Mitsuhiko Nishio
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