JPH01136479U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の実施例に係るセンサの配置図
、第２図は本考案を採用した自動原稿送り装置の
側面図、第３図はその一部拡大図、第４図及び第
５図は他の実施例を示すセンサの配置図、第６図
及び第７図は従来のセンサの配置図である。 ２０……シート検出装置（レジスト部センサ）
、２０ａ……発光部（発光素子）、２０ｂ……受
光部（受光素子）、２１……遮蔽部材（発光部カ
バー）、２２……遮蔽部材（受光部カバー）、２
１ａ……透過孔、２２ａ……透過孔、２１ａ′，
２２ａ′……光路、Ｐ……シート（シート原稿）
。 Fig. 1 is a layout diagram of a sensor according to an embodiment of the present invention, Fig. 2 is a side view of an automatic document feeder employing the present invention, Fig. 3 is a partially enlarged view thereof, and Figs. 4 and 5. 6 is a layout diagram of a sensor showing another embodiment, and FIGS. 6 and 7 are layout diagrams of a conventional sensor. 20... Sheet detection device (registration section sensor)
, 20a... Light emitting part (light emitting element), 20b... Light receiving part (light receiving element), 21... Shielding member (light emitting part cover), 22... Shielding member (light receiving part cover), 2
1a...Transmission hole, 22a...Transmission hole, 21a',
22a'...Optical path, P...Sheet (sheet original)
.

Claims (1)

【実用新案登録請求の範囲】 発光部と受光部とを、それぞれ透過孔を有する
一対の遮蔽部材を介して対向配置し、これら透過
孔の間に形成される光路の遮断の有無によりシー
トの有無を検出してなるシート検出装置において
、 前記両透過孔を所定長さのスリツトとし、かつ
これらスリツトを、その投影方向においてその長
手方向が交叉するように構成したことを特徴とす
るシート検出装置。[Claims for Utility Model Registration] A light-emitting part and a light-receiving part are arranged facing each other via a pair of shielding members each having a transmission hole, and the presence or absence of the sheet is determined by whether or not the optical path formed between these transmission holes is blocked. What is claimed is: 1. A sheet detection device for detecting a sheet, characterized in that both of the transmission holes are slits of a predetermined length, and the slits are configured such that their longitudinal directions intersect in the projection direction.