JP2002127411A - Ink jet recording head and ink jet recorder mounted with it - Google Patents

Ink jet recording head and ink jet recorder mounted with it

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Publication number
JP2002127411A
JP2002127411A JP2000319547A JP2000319547A JP2002127411A JP 2002127411 A JP2002127411 A JP 2002127411A JP 2000319547 A JP2000319547 A JP 2000319547A JP 2000319547 A JP2000319547 A JP 2000319547A JP 2002127411 A JP2002127411 A JP 2002127411A
Authority
JP
Japan
Prior art keywords
ink
recording head
liquid chamber
ink jet
jet recording
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.)
Withdrawn
Application number
JP2000319547A
Other languages
Japanese (ja)
Other versions
JP2002127411A5 (en
Inventor
Kenichi Ogata
Yasuyuki Okada
Atsushi Takaura
賢一 尾方
康之 岡田
淳 高浦
Original Assignee
Ricoh Co Ltd
株式会社リコー
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, 株式会社リコー filed Critical Ricoh Co Ltd
Priority to JP2000319547A priority Critical patent/JP2002127411A/en
Publication of JP2002127411A publication Critical patent/JP2002127411A/en
Publication of JP2002127411A5 publication Critical patent/JP2002127411A5/ja
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording head in which the effect of a pressure relaxing layer can be exhibited sufficiently while reducing power consumption and mutual interference is prevented between a drive bit and a non-drive bit while ensuring a high degree of freedom in the design and arrangement. SOLUTION: The ink jet recording head comprises a recording head section 3 having a plurality of ink ejection bits formed to supply ink from a common liquid chamber 104 through a fluid resistance path 103 into a pressure liquid chamber 102 provided with a diaphragm 109 on one side thereof and to eject the ink from an ink ejection opening 110 at the end part of an ejection channel 101 communicating with the pressure liquid chamber wherein the common liquid chamber is coupled with an ink tank 1 through a communication opening 105 and the ink tank is provided with a pressure relaxing layer on the coupling face side of the common liquid chamber and the communication opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording head and an ink jet recording apparatus equipped with the ink jet recording head.
An ink jet recording head and an ink jet recording head capable of fully exhibiting the effect of the pressure relaxation layer (pressure buffer layer), ensuring high degree of freedom in design and arrangement, and preventing mutual interference between driving bits and non-driving bits. The present invention relates to an ink jet recording apparatus equipped with.

[0002]

2. Description of the Related Art A recording head (inkjet recording head) having a drive system for discharging a recording medium (ink) from a discharge port by a pressure applied to a pressurized liquid chamber by a vibration plate.
Has a simple structure and can easily form a plurality of ejection ports in an array in a highly integrated manner. Therefore, it is widely used as an inkjet printer head, and is suitable as, for example, a color inkjet printer head.

FIG. 3A is a longitudinal sectional view of a conventional ink jet recording head, and FIG. 3B is a transverse sectional view taken along the line BB. As shown in FIGS. 3A and 3B, the conventional ink jet recording head KH0 has a pressure relief layer 108.
Is provided on the upper surface of the ink tank 106, and this arrangement is a general configuration in the above-described type of ink jet recording head. Here, the pressure relaxation layer 108 has an effect of reducing mutual interference described below, regardless of the amount of ink stored in the ink tank 106. The conventional pressure relaxation layer 108 is made of, for example, polyimide.

However, in the configuration in which the pressure relief layer 108 is provided on the upper surface of the ink tank 106, the ink tank 10
As the height of 6 increases, the pressure relaxation layer 108 and the common liquid chamber 104 move away from each other, and the effect of the pressure relaxation layer 108 decreases. Further, if the interval between the ejection ports 110 is reduced in order to increase the density of the ink ejection ports, mutual interference between adjacent pressurized liquid chambers 102 will be a problem as described below. Note that the height of the ink tank 106 is not determined solely by mutual interference, but may be increased by a design change such as adjustment of the ink supply amount and adjustment of the mounting position.

The mutual interference is caused by the pressure applied to the pressurized liquid chamber 102 of the drive bit from which ink is to be ejected by the vibration plate 109 via the common liquid chamber 104 or the side wall 112 between the pressurized liquid chambers 102. The ink is transmitted to the pressurized liquid chamber 102 of the non-driving bit to which the adjacent ink should not be discharged, and causes a pressure fluctuation in a bit (non-driving bit) which does not operate originally. As a result of this mutual interference, there is a disadvantage that the image quality formed by the ink is deteriorated. Reference numeral 101 denotes an ejection flow path, reference numeral 103 denotes a fluid resistance path for adjusting the amount of ink passing therethrough, reference numeral 105 denotes a communication port for connecting the ink tank 106 and the common liquid chamber 104, reference numeral 111 denotes a position of the communication port 105, and reference numeral 113 denotes a communication port. Ink tank width (W),
Reference numeral 114 denotes the height (H) of the ink tank.

As a conventional technique for preventing the mutual interference, there have been proposed a technique of forcibly suppressing vibration on the non-drive bit side and a technique of providing a relaxation area (buffer area) to absorb pressure. The first method is disclosed in Japanese Patent Laid-Open No. 6-143.
As disclosed in Japanese Patent Application Publication No. 562, a technique is also applied in which a voltage is applied to the non-drive bit side as well and the vibration caused by the pressure wave from the drive bit side is canceled to suppress the vibration.

The second method is disclosed in Japanese Patent Application Laid-Open No. H11-192699.
As disclosed in Japanese Unexamined Patent Application Publication No. H11-264, a region for relaxing (buffering) pressure is provided above the common liquid chamber. In this case, it is considered that it is better to provide a pressure relaxation layer (pressure buffer layer) on the wall surface of the ink tank above the common liquid chamber in consideration of ease of manufacture. The third method is to provide a pressure absorber near the common liquid chamber and absorb pressure waves transmitted from the pressurized liquid chamber, as shown in JP-A-6-191030 and JP-A-9-114164. This is a technique for suppressing the pressure fluctuation of the common liquid chamber.

[0008]

However, in the first method, it is extremely difficult to control the voltage on the non-driving bit side, and the voltage is applied to the non-driving bit side. There is a disadvantage that power increases. Further, in the second method, when the pressure relaxation layer is provided above the ink tank, the common liquid chamber and the pressure relaxation layer are separated from each other as the height of the ink tank is increased, and the effect of the pressure relaxation layer is reduced. It has the disadvantage of fading. That is, the drawbacks described in the section of "Prior Art" are not solved. In the third method, the effect of reducing mutual interference is relatively high, but due to design and characteristics, the pressure absorber is arranged in a common liquid chamber deeply related to the pressurized liquid chamber and the fluid resistance section. Therefore, the degree of freedom in design and arrangement is low. In addition, the layout may not be optimized, and the effect may not be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the power consumption, sufficiently exert the effect of the pressure-relaxing layer, and ensure a high degree of freedom in design and arrangement while maintaining the mutual interference between the drive bit and the non-drive bit. It is an object of the present invention to provide an ink jet recording head and an ink jet recording apparatus equipped with the ink jet recording head.

[0010]

According to a first aspect of the present invention, ink is supplied from a common liquid chamber via a fluid resistance path to a pressurized liquid chamber having a diaphragm disposed on one surface thereof. A plurality of ink ejection bits formed so as to eject ink from an ink ejection port at an end of an ejection channel arranged to communicate with the pressurized liquid chamber are arranged to form a recording head portion, and the common liquid is formed. In an ink jet recording head having a chamber connected to an ink tank via a communication port, a pressure reducing means is provided on a side of the ink tank where the common liquid chamber and the communication port are connected. . In this way, as shown in FIGS. 1A and 1B, the distance between the common liquid chamber 104 and the pressure relief means (pressure relief layer 2) is constant (invariant) regardless of the height of the ink tank. ), The mutual interference can be made substantially constant (see FIG. 2).

According to a second aspect of the present invention, the pressure relaxation means includes a member having a free vibration surface having a lower rigidity than a member forming a wall surface of the ink tank. According to this configuration, since the pressure relaxation means is formed of a member having a free vibration surface having a lower rigidity than a member having a higher rigidity on the wall surface of the ink tank, pressure fluctuations can be easily absorbed and mutual interference can be suppressed.

According to a third aspect of the present invention, the member having the free vibration surface is a member made of polyimide. In this way, since the polyimide is a low-cost material that can be easily processed, the effect of reducing mutual interference can be realized easily and at low cost.

According to a fourth aspect of the present invention, the thickness of the member made of polyimide is not less than 10 μm and not more than 20 μm. With this configuration, since the member made of polyimide is made thin, rigidity can be reduced, and the effect of reducing mutual interference can be enhanced.

[0014] According to a fifth aspect of the present invention, the ink tank is separately formed and is later attached to the common liquid chamber. In this case, since the ink tank is formed separately, the manufacturing and assembling steps are simplified, and a low-cost ink jet recording head can be obtained.

According to a sixth aspect of the present invention, there is provided a recording apparatus of an ink-jet system in which the inkjet recording head according to any one of the first to fifth aspects is mounted. With this configuration, the ink jet recording head is configured to be inexpensive and has little mutual interference, so that the ink jet recording apparatus can be configured with good image quality and at low cost.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1A is a longitudinal sectional view of the ink jet recording head KH of the present embodiment, and FIG. 1B is a transverse sectional view along the line BB. Note that the same reference numerals are given to the already described portions, and redundant description will be omitted.

As shown in FIGS. 1A and 1B, a pressure relaxation layer 2 is disposed on the bottom surface of an ink tank 1. In this way, even when the height of the ink tank 1 is increased, the distance between the common liquid chamber 104 and the pressure relaxation layer 2 remains unchanged (constant), so that mutual interference remains small. Reference numeral 3 denotes a recording head portion. FIG. 2 is a characteristic diagram in which the horizontal axis shows the case where the height of the ink tank is changed, and the vertical axis shows the change in mutual interference (maximum displacement of non-drive bit / maximum displacement of drive bit) obtained by experiments. As shown in FIG. 2, in the case of the conventional example, the mutual interference increases as the height of the ink tank increases, but in the case of the present embodiment, the mutual interference is substantially reduced even if the ink tank height increases. It is constant.

According to the present embodiment, from the above characteristics, it is possible not only to suppress the mutual interference between the drive bit and the non-drive bit, but also to obtain the value of the mutual interference with respect to a wide dimensional change in the height of the ink tank. It will be stable. Therefore, there is an advantage that a margin for a dimensional error at the time of manufacturing is wide, and a change in characteristics can be minimized even if the design of the height of the ink tank is changed later. As a means for enhancing the effect of the pressure relaxation layer, the member configuration of the pressure relaxation layer may be a free vibration surface having lower rigidity than the wall surface forming the ink tank. That is, it is desirable to use a member whose Young's modulus is reduced by one digit or more than the member forming the wall surface. In particular,
As a member constituting the free vibration surface, polyimide is suitable, and polyimide is advantageous in terms of processability, mutual interference reduction effect, and cost.

The thickness of the polyimide is desirably in the range of 10 to 20 μm from the viewpoint of the high effect as the pressure relaxation layer and the workability. If the thickness is less than 10 μm, the processing accuracy is reduced. On the other hand, if the thickness is greater than 20 μm, the rigidity of polyimide is increased, so that it is difficult to obtain the effect of reducing mutual interference. As a method of manufacturing the ink tank 1, it is preferable to manufacture the ink tank 1 separately and not to manufacture the ink tank 1 at the same time and to bond the print head section 3 and the ink tank 1 later. Tank 1
Is relatively large, so that it is easy to manufacture.

The ink jet recording head adopting the above configuration can be applied to an ink jet printer (ink jet recording apparatus) and the like. This makes it possible to obtain a high-quality inkjet recording apparatus with little mutual interference.

[0021]

As described above, according to the present invention, the following effects can be obtained. According to the first aspect, since the pressure reducing means is provided on the bottom surface of the ink tank, a recording apparatus (inkjet recording head) with little mutual interference is provided.
Can be obtained. According to the second aspect, since the manufacturing process can be made relatively simple, the effect of reducing mutual interference can be more easily obtained. According to the third aspect, by using a low-cost material that is easy to process, the effect of reducing mutual interference can be realized more easily and at lower cost.

According to the fourth aspect, since the pressure relaxation layer having both high workability and high damping effect can be obtained, the effect of reducing mutual interference can be further enhanced. According to the fifth aspect, since the manufacturing is simple, a low-cost recording apparatus (inkjet recording head) can be obtained. According to claim 6, since the mutual interference is reduced, a high-quality printer can be realized at a low price.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, in which (A)
Is a longitudinal sectional view, and (B) is a transverse sectional view along the line BB.

FIG. 2 is a characteristic diagram showing a difference in mutual interference with respect to ink tank height between the present embodiment and a conventional example.

FIG. 3 is a view showing a conventional example, in which (A) is a longitudinal sectional view,
(B) is a cross-sectional view along the line BB.

[Explanation of symbols]

 KH: Inkjet recording head KH0: Inkjet recording head 1: Ink tank 2: Pressure relief layer (pressure buffer layer) 3: Recording head portion 101: Injection flow path 102: Pressurized liquid chamber 103: Fluid resistance path 104: Common liquid chamber Reference numeral 105: communication port 106: ink tank 108: pressure relief layer 109: diaphragm 110: discharge port 111: communication port position 112: side wall 113: width of the ink tank 114: height of the ink tank

Claims (6)

[Claims]
1. An end of an ejection flow path in which ink is supplied from a common liquid chamber via a fluid resistance path to a pressurized liquid chamber having a vibrating plate disposed on one surface thereof, and the ink is arranged to communicate with the pressurized liquid chamber. A plurality of ink discharge bits formed so as to be discharged from the ink discharge ports of the unit are arranged to form a recording head portion, and the common liquid chamber is connected to an ink tank via a communication port. In the recording head, an ink jet recording head is provided with a pressure reducing means on a side of a connection surface between the common liquid chamber and the communication port in the ink tank.
2. An ink jet recording head according to claim 1, wherein said pressure relaxation means includes a member having a free vibration surface having lower rigidity than a member forming a wall surface of said ink tank.
3. The ink jet recording head according to claim 2, wherein the member having the free vibration surface is a member made of polyimide.
4. The thickness of the member made of polyimide is as follows:
4. The ink jet recording head according to claim 3, wherein the thickness is 10 μm or more and 20 μm or less.
5. The ink tank according to claim 1, wherein the ink tank is separately formed and is later attached to the common liquid chamber.
The inkjet recording head according to claim 1.
6. An ink jet recording apparatus comprising the ink jet recording head according to claim 1.
JP2000319547A 2000-10-19 2000-10-19 Ink jet recording head and ink jet recorder mounted with it Withdrawn JP2002127411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000319547A JP2002127411A (en) 2000-10-19 2000-10-19 Ink jet recording head and ink jet recorder mounted with it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000319547A JP2002127411A (en) 2000-10-19 2000-10-19 Ink jet recording head and ink jet recorder mounted with it

Publications (2)

Publication Number Publication Date
JP2002127411A true JP2002127411A (en) 2002-05-08
JP2002127411A5 JP2002127411A5 (en) 2006-03-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000319547A Withdrawn JP2002127411A (en) 2000-10-19 2000-10-19 Ink jet recording head and ink jet recorder mounted with it

Country Status (1)

Country Link
JP (1) JP2002127411A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004082945A1 (en) * 2003-03-18 2004-09-30 Seiko Epson Corporation Liquid jetting device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004082945A1 (en) * 2003-03-18 2004-09-30 Seiko Epson Corporation Liquid jetting device
CN100421954C (en) * 2003-03-18 2008-10-01 精工爱普生株式会社 Liquid jetting device
US7614729B2 (en) 2003-03-18 2009-11-10 Seiko Epson Corporation Liquid jetting device
US7997699B2 (en) 2003-03-18 2011-08-16 Seiko Epson Corporation Liquid ejecting apparatus
US8235511B2 (en) 2003-03-18 2012-08-07 Seiko Epson Corporation Liquid ejecting apparatus

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