ILLUMINATION DEVICE FOR IMAGE SENSOR

• Main Authors: MORIMOTO TAKAAKI, KIYOSE HIROKI, FUKAKI NAOKI, BOGAKI AKIRA
• Format: Patent
• Language: English; Japanese
• Published: 16.09.2021
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CHECKING-DEVICES; CINEMATOGRAPHY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING; HOLOGRAPHY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

To provide an illumination device for an image sensor that enhances uniformity in a primary scanning direction of light emitted from a light guide body, even if a light source is not disposed at a center of an end face of the light guide body.SOLUTION: An illumination device for image sensor 1 includes: at least one light guide body 100A, B provided in a primary scanning direction D1; and a first light source group 210 disposed facing a first end surface 101A and a second light source group 220 disposed facing a second end surface 102A among at least two end surfaces in the primary scanning direction of the at least one light guide body. The first light source group includes a first light source 211 which emits light of a predetermined wavelength band. The second light source group includes a second light source 221 which emits light of the same wavelength band as the light emitted by the first light source. In a state in which the at least one light guide body is viewed in the primary scanning direction from the first end surface side, an absolute value of an X coordinate in a corresponding XY coordinate system of the first light source is equal to an absolute value of the X coordinate in a corresponding XY coordinate system of the second light source.SELECTED DRAWING: Figure 1 【課題】光源が導光体の端面の中心に配置されていなかくても、導光体から出射される光の主走査方向における均一性を高めるイメージセンサ用照明装置を提供する。【解決手段】イメージセンサ用照明装置１は、主走査方向Ｄ１に延設された少なくとも１本の導光体１００Ａ、Ｂと、少なくとも１本の導光体の主走査方向における少なくとも２つの端面のうち第１の端面１０１Ａに対向して配置された第１の光源群２１０及び第２の端面１０２Ａに対向して配置された第２の光源群２２０と、を備える。第１の光源群は、所定の波長帯域の光を照射する第１の光源２１１を含む。第２の光源群は、第１の光源が照射する光と同じ波長帯域の光を照射する第２の光源２２１を含む。第１の端面側から主走査方向に少なくとも１本の導光体を見た状態において、第１の光源の対応するＸＹ座標系におけるＸ座標の絶対値は、第２の光源の対応するＸＹ座標系におけるＸ座標の絶対値と等しい。【選択図】図１