JPS6221549A - Sensor for residual ink amount in ink cartridge - Google Patents

Sensor for residual ink amount in ink cartridge

Info

Publication number
JPS6221549A
JPS6221549A JP16237185A JP16237185A JPS6221549A JP S6221549 A JPS6221549 A JP S6221549A JP 16237185 A JP16237185 A JP 16237185A JP 16237185 A JP16237185 A JP 16237185A JP S6221549 A JPS6221549 A JP S6221549A
Authority
JP
Japan
Prior art keywords
ink
ink cartridge
bag
remaining
detection device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP16237185A
Other languages
Japanese (ja)
Inventor
Hiroshi Yamazaki
博史 山崎
Kyuhachiro Iwasaki
岩崎　久八郎
Takuo Isayama
伊佐山　拓郎
Minoru Ameyama
飴山　実
Shuzo Matsumoto
松本　修三
Yasuo Katano
泰男 片野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP16237185A priority Critical patent/JPS6221549A/en
Publication of JPS6221549A publication Critical patent/JPS6221549A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17566—Ink level or ink residue control

Landscapes

  • Ink Jet (AREA)

Abstract

PURPOSE:To exactly detect residual ink amount in an ink bag in a cartridge at low cost by a simple constitution in which a light reflector is provided to the film of an ink bag set in an ink cartridge, and a luminous element and a light receiver are provided on the carriage side. CONSTITUTION:In the central frame 1 of ink cartridge, the angle (alpha) of 90 deg. of edged lines are formed in the central section for forming light paths, which is made up of a transparent material. An ink-inducing groove 4 is formed in the side slope portion of the edged lines, and an ink-inducing hole is extended from the tip portion of the groove 4. A reflector is formed by vapor deposition or in sandwiched form on all or partial portion of an ink bag film. By using the ink bag 2 and cartridge frame 1, where no reflector but the ink bag 2 and the ink cartridge frame 1 is provided for the ink cartridge 1 side, a reflecting face is formed for the case where ink is running out. The reflecting face is detected by light sensors 6a and 6b provided on the carriage II side.

Description

【発明の詳細な説明】 枝術−分野 本発明は、インクジェットヘッドと一体型のインクカー
トリッジ内のインク残量を検知する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the amount of ink remaining in an ink cartridge integrated with an inkjet head.

従来技術 一般に、インクジェットプリンタにおいては、インク液
体を記録情報に従って液滴の形で記録紙に衝突させ、ド
ツトの集合として情報記録を行っている。従って、イン
クは液体のまま容器に保存され、プリンタの作動によっ
て容器内のインク残量が少なくなった場合に、そのこと
を使用者に知らせるための警報装置を備えている。2. Description of the Related Art In general, inkjet printers record information in the form of a collection of dots by causing ink liquid to collide with recording paper in the form of droplets in accordance with recording information. Therefore, the ink is stored as a liquid in the container, and an alarm device is provided to notify the user when the amount of ink remaining in the container becomes low due to operation of the printer.

第５図及び第６図は、それぞれ光センサを利用してイン
ク残量を検知する従来例を示す概略図で、図中、２０は
インク袋、２１はインク袋上面位置検出板、２２は反射
板、２３は遮光板、２４は外部設置の光センサで、第５
図に示した例は、インク袋２０のインク残量の減少とと
もに検出板２１が下降し、インク袋２０内のインクが空
に近すいた時に外部設置の光センサ２４が反射板２２を
検知してインク袋２０内の残存インクが少ないことを知
らせるものであり、第６図に示した例は、インク袋２０
内のインク残量の減少とともに検出板２１が下降し、イ
ンク袋２０内のインクが空に近すいた時に、光センサ２
４から遮光板２３が離れ、これによって、光センサ２４
がインク袋２０内の残存インクが少ないことを検知する
ものである。5 and 6 are schematic diagrams showing conventional examples of detecting the remaining amount of ink using optical sensors, respectively. In the figures, 20 is an ink bag, 21 is an ink bag upper surface position detection plate, and 22 is a reflective board, 23 is a light shielding plate, 24 is an externally installed optical sensor, and the fifth
In the example shown in the figure, the detection plate 21 is lowered as the amount of ink remaining in the ink bag 20 decreases, and when the ink in the ink bag 20 is nearly empty, the externally installed optical sensor 24 detects the reflection plate 22. This is to notify that the remaining ink in the ink bag 20 is low.
The detection plate 21 moves down as the amount of ink remaining in the ink bag decreases, and when the ink in the ink bag 20 is almost empty, the optical sensor 2
4, the light shielding plate 23 is separated from the light sensor 24.
This detects that there is little remaining ink in the ink bag 20.

而して、上記従来のインク残量検知装置は、インク袋の
上面と一体的に移動するインク袋上面位置検出板２１を
付加し、この検出板２１の一部に反射板２２又は遮光板
２３を設けるものであるが、インクカートリッジにイン
ク袋のインク残量の減少とともに変位する部材例えばイ
ンク袋上面位置検出板２１、反射板２２、或いは遮光板
２３等を必要とし、構造が複雑となり、そのため、コス
ト高となり、また、トラブルが発生し易く、確実な検出
ができない等の欠点があった。The conventional ink level detection device described above has an ink bag top surface position detection plate 21 that moves integrally with the top surface of the ink bag, and a reflection plate 22 or a light shielding plate 23 is attached to a part of this detection plate 21. However, the ink cartridge requires members such as the ink bag top surface position detection plate 21, the reflector plate 22, or the light shielding plate 23, etc., which are displaced as the amount of ink remaining in the ink bag decreases, resulting in a complicated structure. However, there are drawbacks such as high cost, easy troubles, and inability to perform reliable detection.

目　　　　　的 本発明は、上述のごとき実情に鑑みてなされたもので、
特に、インクオンデマンドインクジェット記録装置に使
用するヘッド一体型のインクカートリシンにおいて、カ
ー１−リッジ内インク袋のインク残量を簡易な構成によ
って低コストで確実に検出することを目的としてなされ
たものである。Purpose The present invention was made in view of the above-mentioned circumstances.
In particular, it was developed with the aim of reliably detecting the amount of ink remaining in the ink bag in the cartridge 1 ridge at low cost and with a simple configuration in head-integrated ink cartridge recyclers used in ink-on-demand inkjet recording devices. It is.

構　　　成 本発明は、上記目的を達成するため、インクジェットヘ
ッドを一体的に有するインクカートリッジにおいて、前
記インクカートリッジ内に配設されたインク袋のフィル
ムに光反射部材を有するとともに、前記キャリッジ側に
発光素子及び受光素子を有し、インク残量寡少時の前記
インク袋の変形を前記発光素子及び受光素子にて検出す
るようにしたことを特徴としたものである。以下、本発
明の実施例に基づいて説明する。Structure In order to achieve the above object, the present invention provides an ink cartridge that integrally includes an inkjet head, in which a light reflecting member is provided on the film of an ink bag disposed in the ink cartridge, and a light emitting element is provided on the carriage side. and a light-receiving element, and the deformation of the ink bag when the amount of ink remaining is low is detected by the light-emitting element and the light-receiving element. Hereinafter, the present invention will be explained based on examples.

第１図は、本発明によるインク残量検知装置の一実施例
を説明するための背面構成図、第２図は、側面構成図で
、図中、■は、インクカートリッジ部、■はキャリッジ
部、１はインクカートリッジ中心枠、２はインク袋、３
はインク、４はインク導出溝、５はインクカートリッジ
カバー、６ｏは発光素子、６ｂは受光素子、７０ｔ　７
ｂは集光レンズ、８はキャリッジ、９はガイドレール、
１０は中心枠稜線部、１１はヘッド本体、］２はコネク
タ一部、１３はインク導出穴で、インク袋２を構成する
フィルムの断面構造は、第３図に詳細に示すように、外
部大気面からインク側に向って例えばＰＥＴ　（ポリエ
チレンテレフタレートポリエステル）２ａ、該ＰＥＴの
内面に蒸着されたアルミ層２ｂ、ポリ塩化ビニリデンフ
ィルム２Ｃ、ポリエチレンフィルム２ｄから成っている
。而して、本発明は、インク袋２のフィルム面が、イン
ク残量寡少時に、光の反射面を形成し、この反射面を利
用してインク残量の寡少を検出するものであり、従って
、インク袋フィルムの全面又は一部に反射部材が蒸着或
いはサンドイッチにて付加されている。従って、本発明
によると、インクカートリッジＩ側にインク袋２、イン
クカートリッジ枠１以外に何らの反射部材を付加せず、
これらインク袋及びカートリッジ枠部材を利用してイン
ク寡少時における反射面を形成し、この反射面をキャリ
ッジ■側に設けられた光センサ６ｏ、６ｂによって検出
することができる。なお、インク袋２、インクカートリ
ッジ中心枠１等の材質は、」二連のごとく作用させるた
めにある程度規定されるが、高価になるなどの弊害は一
切無く、例えば、インク袋用フィルム２として、反射面
を形成するため金属蒸着又は金属箔フィルム（アルミな
ど使用）２ｂを用いているが、この金属性フィルムは低
透気性、低透湿性材料としても役立ち、インク袋内に気
泡が混入し、或いは、インク袋のインク中の水分が蒸発
するのを防止する役割もしている。インクカートリッジ
中心枠１は光経路を形成するため図示の如く中央内部に
稜線部］、Ｏ（稜線部角度αは９０°である。）を形成
し、透明材で構成されているが、この稜線の側斜面部に
は第２図に示す如く、インク導出溝４が切ってあって、
その先はインク導出穴１３まで伸びている。その機能は
インク残量寡少時にインク袋が第１図に一点鎖線にて示
すように確実に稜線面に密着し、反射面を形成せしむる
ようにしたことにある。発光素子６゜。FIG. 1 is a rear configuration diagram for explaining one embodiment of the remaining ink amount detection device according to the present invention, and FIG. 2 is a side configuration diagram. In the figure, ■ indicates an ink cartridge section, and ■ indicates a carriage section. , 1 is the ink cartridge center frame, 2 is the ink bag, 3
is ink, 4 is an ink guide groove, 5 is an ink cartridge cover, 6o is a light emitting element, 6b is a light receiving element, 70t 7
b is a condenser lens, 8 is a carriage, 9 is a guide rail,
10 is a center frame ridgeline, 11 is a head body, ]2 is a connector part, and 13 is an ink outlet hole.The cross-sectional structure of the film constituting the ink bag 2 is as shown in detail in FIG. It consists of, for example, PET (polyethylene terephthalate polyester) 2a, an aluminum layer 2b deposited on the inner surface of the PET, a polyvinylidene chloride film 2C, and a polyethylene film 2d from the surface toward the ink side. Therefore, in the present invention, the film surface of the ink bag 2 forms a light reflecting surface when the amount of ink remaining is low, and this reflective surface is used to detect whether the remaining amount of ink is low. A reflective member is added to the entire surface or a part of the ink bag film by vapor deposition or sandwiching. Therefore, according to the present invention, no reflective member is added to the ink cartridge I side other than the ink bag 2 and the ink cartridge frame 1;
These ink bags and cartridge frame members are used to form a reflective surface when ink is low, and this reflective surface can be detected by optical sensors 6o and 6b provided on the carriage (2) side. Note that the materials of the ink bag 2, the ink cartridge center frame 1, etc. are specified to some extent in order to make them work like two series, but there is no problem such as high cost, and for example, as the ink bag film 2, Metal vapor deposition or metal foil film (using aluminum, etc.) 2b is used to form the reflective surface, but this metal film also serves as a material with low air permeability and low moisture permeability, and air bubbles may get mixed into the ink bag. Alternatively, it also serves to prevent the moisture in the ink in the ink bag from evaporating. The ink cartridge center frame 1 has a ridgeline part ], O (the ridgeline part angle α is 90°) inside the center as shown in the figure to form an optical path, and is made of a transparent material. As shown in FIG. 2, an ink guide groove 4 is cut in the side slope part of the ink.
The tip thereof extends to the ink outlet hole 13. Its function is to ensure that the ink bag comes into close contact with the ridgeline surface as shown by the dashed line in FIG. 1 when the amount of ink remaining is low, thereby forming a reflective surface. Light emitting element 6°.

受光素子６ｂはキャリッジ８中に装填され、光検出効率
を上げるため、集光レンズ７ａ、７ｂが付加されている
。また、検出効率を上げるため、インクカートリッジカ
バー５は不透明遮光材で形成されている。The light receiving element 6b is loaded into the carriage 8, and condensing lenses 7a and 7b are added to increase the light detection efficiency. Furthermore, in order to increase detection efficiency, the ink cartridge cover 5 is made of an opaque light-shielding material.

第４図は、本発明の他の実施例を説明するための要部構
成図で、この実施例は、第１図に示したようなフィルム
自体に反射面を封じ込めたインク袋に代って透明インク
袋２′を用い、このインク袋２′の光路面にスポット的
に可撓性の反射部材１５を貼付したものであり、このよ
うにしても、第１図乃至第３図に示して実施例と全く同
様にしてインク袋２内のインク残量の寡少を検出するこ
とができる。FIG. 4 is a block diagram of main parts for explaining another embodiment of the present invention. This embodiment replaces the ink bag shown in FIG. A transparent ink bag 2' is used, and a flexible reflective member 15 is attached in spots on the optical path surface of the ink bag 2'. The amount of ink remaining in the ink bag 2 can be detected in exactly the same manner as in the embodiment.

効　　　呆 以上の説明から明らかなように、本発明によると、イン
クカートリッジ倶０こデバイスをほとんど付加すること
なく、カートリッジ自身の構造を効果的に利用してイン
ク袋内のインク残量の寡少を検知するようにしたので、
コスト安で、しかも光学的に非接触にて検知するように
しているため、電気的なトラブルが少ない等の利点があ
る。Efficacy As is clear from the above description, according to the present invention, the structure of the cartridge itself can be effectively used to check the amount of ink remaining in the ink bag without adding any additional devices to the ink cartridge. I made it to detect,
It has advantages such as low cost and fewer electrical troubles because it is optically detected without contact.

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

第１図は、本発によるインク残量検知装置の一実施例を
説明するための背面構成図、第２図は、側面構成図、第
３図は、インク袋の断面詳細図、第４図は、本発明の他
の実施例を示す要部構成図、第５図及び第６図は、それ
ぞれ従来のインク残量検知装置の例を説明するための構
成図である。 １・・・インクカートリッジ中心枠、２・・・インク袋
。 ３・・・インク、４・・・インク導出溝、５・・・イン
クカートリッジカバー、６ｏ・・・発光素子、６ｂ・・
・受光素子、７ａ＋７ｂ・・・集光レンズ、８・・・キ
ャリッジ、９・・・ガイドレール、１０・・・中心枠稜
線部、１１・・・ヘッド本体、１２・・・コネクタ一部
、１３・・・インク導出穴、１５・・・接着アルミ箔。 特許出願人　　株式会社　リコー 第　　１　　図FIG. 1 is a rear configuration diagram for explaining one embodiment of the remaining ink level detection device according to the present invention, FIG. 2 is a side configuration diagram, FIG. 3 is a detailed cross-sectional view of an ink bag, and FIG. 4 1 is a main part configuration diagram showing another embodiment of the present invention, and FIGS. 5 and 6 are configuration diagrams for explaining an example of a conventional remaining ink amount detection device, respectively. 1... Ink cartridge center frame, 2... Ink bag. 3... Ink, 4... Ink guide groove, 5... Ink cartridge cover, 6o... Light emitting element, 6b...
- Light receiving element, 7a+7b...Condensing lens, 8...Carriage, 9...Guide rail, 10...Center frame ridgeline, 11...Head body, 12...Part of connector, 13 ... Ink lead-out hole, 15 ... Adhesive aluminum foil. Patent applicant Ricoh Co., Ltd. Figure 1

Claims (6)

【特許請求の範囲】[Claims] （１）、インクジェットヘッドを一体的に有するインク
カートリッジにおいて、前記インクカートリッジ内に配
設されたインク袋のフィルムに光反射部材を有するとと
もに、前記キャリッジ側に発光素子及び受光素子を有し
、インク残量寡少時の前記インク袋の変形を前記発光素
子及び受光素子にて検出するようにしたことを特徴とす
るインクカートリッジ内のインク残量検知装置。(1) In an ink cartridge having an integral inkjet head, a film of an ink bag disposed in the ink cartridge has a light reflecting member, and a light emitting element and a light receiving element are provided on the carriage side, and the ink An ink remaining amount detection device in an ink cartridge, characterized in that deformation of the ink bag when the remaining amount is low is detected by the light emitting element and the light receiving element. （２）、前記インクカートリッジは中央部に透明の中心
枠を有し、その両側を別々のプラスチックフィルムで囲
んでインク充填空間を形成し、前記中心枠の内側中央部
が略９０°の角度で稜線部を形成していることを特徴と
する特許請求の範囲第（１）項に記載のインクカートリ
ッジ内のインク残量検知装置。(2) The ink cartridge has a transparent central frame in the center, which is surrounded by separate plastic films on both sides to form an ink filling space, and the inner central part of the central frame is at an angle of approximately 90°. The remaining ink amount detection device in an ink cartridge according to claim (1), characterized in that a ridgeline portion is formed. （３）、前記インク袋のフィルムの全面又は一部にアル
ミ等の金属を蒸着するか又は金属箔を用いることによつ
て反射機能をもたせたことを特徴とする特許請求の範囲
第（１）項又は第（２）項に記載のインクカートリッジ
内のインク残量検知装置。(3) Claim (1) characterized in that the film of the ink bag has a reflective function by vapor-depositing a metal such as aluminum or using metal foil on the entire surface or a part of the film of the ink bag. The remaining ink amount detection device in the ink cartridge according to item (2) or item (2). （４）、インクカートリッジカバーが不透明遮光材で形
成されていることを特徴とする特許請求の範囲第（１）
項乃至第（３）項のいずれか１項に記載のインクカート
リッジ内のインク残量検知装置。(4) Claim No. (1) characterized in that the ink cartridge cover is formed of an opaque light-shielding material.
The remaining ink amount detection device in an ink cartridge according to any one of items 1 to 3). （５）、前記稜線部が親水処理又は若干のザラザラ面に
形成され、インクが在る時はインクとよく接触して反射
面を形成しないようにしたことを特徴とする特許請求の
範囲第（２）項に記載のインクカートリッジ内のインク
残量検知装置。(5) The ridgeline portion is subjected to hydrophilic treatment or is formed to have a slightly rough surface, so that when ink is present, the ridgeline portion is in good contact with the ink and does not form a reflective surface. The remaining ink amount detection device in the ink cartridge according to item 2). （６）、インクカートリッジ中心枠稜線部はインク導出
穴に向かつてインク導出溝がその側斜面に設けられてい
ることを特徴とする特許請求の範囲第（２）項に記載の
インクカートリッジ内のインク残量検知装置。(6) In the ink cartridge according to claim (2), the ink cartridge center frame ridgeline portion faces the ink outlet hole and an ink guide groove is provided on the side slope thereof. Ink level detection device.
JP16237185A 1985-07-23 1985-07-23 Sensor for residual ink amount in ink cartridge Pending JPS6221549A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16237185A JPS6221549A (en) 1985-07-23 1985-07-23 Sensor for residual ink amount in ink cartridge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16237185A JPS6221549A (en) 1985-07-23 1985-07-23 Sensor for residual ink amount in ink cartridge

Publications (1)

Publication Number Publication Date
JPS6221549A true JPS6221549A (en) 1987-01-29

Family

ID=15753300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16237185A Pending JPS6221549A (en) 1985-07-23 1985-07-23 Sensor for residual ink amount in ink cartridge

Country Status (1)

Country Link
JP (1) JPS6221549A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5406315A (en) * 1992-07-31 1995-04-11 Hewlett-Packard Company Method and system for remote-sensing ink temperature and melt-on-demand control for a hot melt ink jet printer
EP0706888A2 (en) * 1994-10-14 1996-04-17 Canon Kabushiki Kaisha Ink jet recording apparatus having residual quantity detection unit and residual quantity detection method therefor
EP0749840A2 (en) * 1995-06-19 1996-12-27 Canon Kabushiki Kaisha Printing apparatus and facsimile apparatus using same
EP0753411A2 (en) * 1995-07-14 1997-01-15 Canon Kabushiki Kaisha Ink jet recording apparatus with device for detecting the presence or absence of ink
EP0769382A1 (en) * 1995-10-20 1997-04-23 Hewlett-Packard Company Method and device for detecting the ink level in a cartridge
EP0779156A1 (en) * 1995-12-14 1997-06-18 Xerox Corporation Sensing system for detecting presence of an ink container and level of ink therein
US5748215A (en) * 1992-12-22 1998-05-05 Hewlett-Packard Company Ink-jet printer including ink cartridge with optimum snout and alignment surfaces
US5929885A (en) * 1993-02-03 1999-07-27 Canon Kabushiki Kaisha Ink consumption detection using a photosensor with a light-transmissive ink container
US6012795A (en) * 1992-06-03 2000-01-11 Canon Kabushiki Kaisha Ink amount detecting device and recording apparatus provided with such a device
US6012794A (en) * 1996-03-22 2000-01-11 Canon Kabushiki Kaisha Inkjet printing apparatus which determines residual ink amount, and method of detecting ink
US7357495B2 (en) * 2004-03-10 2008-04-15 Seiko Epson Corporation Liquid container with internal liquid pack
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US5406315A (en) * 1992-07-31 1995-04-11 Hewlett-Packard Company Method and system for remote-sensing ink temperature and melt-on-demand control for a hot melt ink jet printer
US5748215A (en) * 1992-12-22 1998-05-05 Hewlett-Packard Company Ink-jet printer including ink cartridge with optimum snout and alignment surfaces
US6206515B1 (en) 1992-12-22 2001-03-27 Hewlett-Packard Company Double compartment ink-jet cartridge with optimum snout
US5929885A (en) * 1993-02-03 1999-07-27 Canon Kabushiki Kaisha Ink consumption detection using a photosensor with a light-transmissive ink container
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US5975665A (en) * 1994-10-14 1999-11-02 Canon Kabushiki Kaisha Ink jet recording apparatus having residual quantity detection unit and residual quantity detection method thereof
US6086178A (en) * 1995-06-19 2000-07-11 Canon Kabushiki Kaisha Ink detection for printers and scanners
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EP0749840A2 (en) * 1995-06-19 1996-12-27 Canon Kabushiki Kaisha Printing apparatus and facsimile apparatus using same
EP0753411A3 (en) * 1995-07-14 1997-03-26 Canon Kk Ink jet recording apparatus with device for detecting the presence or absence of ink
EP2153999A3 (en) * 1995-07-14 2010-09-01 Canon Kabushiki Kaisha Recording apparatus having a device for detecting the presence or absence of a liquid
EP0753411A2 (en) * 1995-07-14 1997-01-15 Canon Kabushiki Kaisha Ink jet recording apparatus with device for detecting the presence or absence of ink
EP2153999A2 (en) * 1995-07-14 2010-02-17 Canon Kabushiki Kaisha Recording apparatus having a device for detecting the presence or absence of a liquid
US6024428A (en) * 1995-07-14 2000-02-15 Canon Kabushiki Kaisha Recording apparatus having a device for detecting the presence or absence of a liquid
US7290843B2 (en) 1995-07-14 2007-11-06 Canon Kabushiki Kaisha Recording apparatus having a device for detecting the presence or absence of a liquid
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US7438369B2 (en) 1995-07-14 2008-10-21 Canon Kabushiki Kaisha Recording apparatus having a device for detecting the presence or absence of a liquid
US7172259B2 (en) 1995-07-14 2007-02-06 Canon Kabushiki Kaisha Recording apparatus having a device for detecting the presence or absence of a liquid
EP0769382A1 (en) * 1995-10-20 1997-04-23 Hewlett-Packard Company Method and device for detecting the ink level in a cartridge
EP0779156A1 (en) * 1995-12-14 1997-06-18 Xerox Corporation Sensing system for detecting presence of an ink container and level of ink therein
US6409302B2 (en) 1995-12-14 2002-06-25 Xerox Corporation Sensing system for detecting presence of an ink container and level of ink therein
US5997121A (en) * 1995-12-14 1999-12-07 Xerox Corporation Sensing system for detecting presence of an ink container and level of ink therein
US6012794A (en) * 1996-03-22 2000-01-11 Canon Kabushiki Kaisha Inkjet printing apparatus which determines residual ink amount, and method of detecting ink
US7357495B2 (en) * 2004-03-10 2008-04-15 Seiko Epson Corporation Liquid container with internal liquid pack
JP2011126040A (en) * 2009-12-15 2011-06-30 Canon Inc Ink tank and liquid ejection apparatus

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