JP2007276171A - Liquid jet recording head and liquid jet recording apparatus - Google Patents

Abstract

A liquid-jet recording head and a liquid-jet recording apparatus in which the function does not deteriorate even when used in a place where the temperature environment changes greatly.
A seal member 61 is opened by a shape memory alloy spring 63 so that an opening 57 of an opening 51 is closed when an environmental temperature becomes higher than an operating temperature range in which a liquid jet recording head is used. When the environment temperature is lowered by moving against the urging force of 62 to insulate the inside of the carriage 3, the shape memory alloy spring 63 is deformed so that the opening 57 of the opening 51 is opened, and the seal body 61 is opened. The carriage 3 is moved by the urging force of the spring 62 to bring the inside of the carriage 3 into communication with the outside air. Even if the temperature is changed in a large place, the temperature change inside the carriage 3 becomes gradual, and the temperature of the printhead main body is increased. It is maintained in an environment that does not rise too much.
[Selection] Figure 3

Description

  The present invention relates to a liquid ejecting recording head and a liquid ejecting recording apparatus that suppress functional degradation due to changes in temperature environment.

  In general, in an ink jet recording head which is a liquid ejecting recording head, ink is supplied from an ink cartridge filled with ink through an ink supply needle and a flow path inserted into the ink cartridge, and the supplied ink is It is ejected from the nozzle by driving a piezoelectric element or the like. In general, an ink jet recording apparatus in which an ink jet recording head is mounted on a carriage has components, mechanisms, ink types, and the like determined on the assumption that it is used in a normal temperature range.

  Due to the diversification of lifestyles in recent years, various devices have been used in various places, and ink jet recording apparatuses are also expected to be used in vehicles such as automobiles. ing. When a vehicle such as an automobile is parked under hot weather, it is known that the interior of the vehicle becomes considerably hot depending on the season. Since general inkjet recording devices are supposed to be used at room temperature, if they are used in a vehicle and left unattended, the temperature will greatly exceed room temperature or be exposed to sudden temperature changes. Will be placed.

  Since normal inkjet recording devices are premised on the use at room temperature, the components, mechanisms, ink types, etc. are determined, so if left in a vehicle in a temperature environment that greatly exceeds room temperature, There is a possibility that the viscosity of the ink increases due to evaporation of moisture in the ink and that the ink flow path is clogged due to drying, sticking, or the like. If the ink viscosity increases or the ink flow path becomes clogged, printing defects such as missing print dots will occur. In addition, it is assumed that a sudden temperature change occurs in the vehicle from a high temperature environment to near room temperature due to the use of an air conditioner or the like. When a normal ink jet recording apparatus is placed in a temperature environment where it is exposed to a rapid temperature change, it is conceivable that peeling or dropping of adhesive parts may occur due to the difference in thermal expansion / contraction rate of each part.

  Conventionally, in order to cut off the environment of the head from the ambient temperature environment, a technique for housing the inkjet head with a heat insulating material (see Patent Document 1), and a moisturizing device structure to prevent evaporation of ink filled in the ink delivery tube have been provided. The provided technique (refer patent document 2) is proposed. However, the technique disclosed in Patent Document 1 is to keep the temperature of hot melt type ink, and the technique disclosed in Patent Document 2 is to prevent evaporation of ink in the ink delivery tube. The heat insulating material and the moisturizing device structure do not contribute to any severe temperature environment change.

JP-A-9-164701 Japanese Patent Laid-Open No. 10-44458

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a liquid jet recording head and a liquid jet recording apparatus in which the function does not deteriorate even when used in a place where a change in temperature environment is large. .

In order to achieve the above object, a first aspect of the present invention includes a recording head body having a plurality of nozzle openings for supplying liquid from a liquid cartridge and discharging droplets, and the recording head body is mounted on a carriage. In the liquid jet recording head, the liquid jet is characterized in that the carriage is formed of a housing that seals the recording head main body in a heat-insulated state, and the housing is provided with an opening and an opening / closing member that opens and closes the opening. In the recording head.
In the first aspect, when the environmental temperature deviates from the operating temperature range in which the liquid jet recording head is used, the opening is closed by the opening / closing member to insulate the environmental temperature from the inside of the carriage, and the environmental temperature is the operating temperature. By opening the opening with the opening and closing member when the range is reached, the ambient temperature and the inside of the carriage are in communication with each other, so even if the temperature environment changes greatly, the temperature environment inside the carriage can be changed. Get smaller.

According to a second aspect of the present invention, in the liquid jet recording head according to the first aspect, the opening and closing member is a valve member that opens and closes the opening according to a change in environmental temperature. In the recording head.
In the second aspect, the valve member can be operated in accordance with the temperature change of the environmental temperature, and the temperature environment change inside the carriage becomes small even when used in a place where the temperature environment change is large.

According to a third aspect of the present invention, in the liquid jet recording head according to the second aspect, the valve member operates to close the opening when the temperature of the environmental temperature becomes equal to or higher than a predetermined temperature. The liquid jet type recording head is characterized.
In the third aspect, the temperature in the carriage can be maintained in the operating temperature range when the environmental temperature becomes high, and the inside of the carriage can be used even in a place where the environmental change becomes large in a high temperature state. The change in temperature rise is small.

According to a fourth aspect of the present invention, in the liquid jet recording head according to the third aspect, the opening provided with the valve member is provided at least at two positions above and below the carriage. In the jet recording head.
In the fourth aspect, when the environmental temperature is lowered when the temperature in the carriage is maintained in the operating temperature range when the environmental temperature becomes high, outside air is introduced from the lower opening to By discharging the internal fluid from the opening, the atmosphere in the carriage can be efficiently brought to the environmental temperature range.

According to a fifth aspect of the present invention, in the liquid jet recording head according to the third or fourth aspect, the valve member is closed with a function of detecting a temperature and sucking a liquid when the power is turned on. The predetermined temperature that operates in the liquid jet recording head is a temperature at which a function for sucking the liquid operates.
In the fifth aspect, the atmosphere in the carriage can be adjusted to the operating temperature range in accordance with the operation for sucking the liquid.

According to a sixth aspect of the present invention, in the liquid jet recording head according to any one of the second to fifth aspects, the valve member is operated by a shape memory alloy that is deformed by a temperature change. In the recording head.
In the sixth aspect, by using a shape memory alloy that is deformed by a temperature change, the valve member can be operated at a desired temperature without using power by adjusting the composition.

In order to achieve the above object, a seventh aspect of the present invention includes a recording head body having a plurality of nozzle openings for supplying liquid from a liquid cartridge and discharging droplets, and the recording head body is mounted on a carriage. In the liquid jet recording head, the carriage is formed of a casing that seals the recording head main body in a heat-insulating state, and openings that communicate the inside and outside of the casing are provided at two locations above and below the carriage, and the environmental temperature is predetermined. A valve member that operates so as to close the opening when the temperature is higher than the temperature; the opening is configured by a valve body having an opening; and the valve member is supported by the valve body so as to be reciprocally movable. An opening spring that urges the seal body in a state where the opening is opened, and a change that moves the seal body so as to close the opening against the urging force of the opening spring when the environmental temperature exceeds a predetermined temperature. A liquid jet recording head characterized in that it comprises a shape memory alloy spring.
In the seventh aspect, when the environmental temperature becomes higher than the operating temperature range in which the liquid jet recording head is used, the shape memory alloy spring closes the opening of the opening so that the opening of the opening is closed. When it moves against the urging force to insulate the inside of the carriage and the environmental temperature becomes low, the shape memory alloy spring is deformed so that the opening of the opening is opened, and the sealing body moves by the urging force of the opening spring. As a result, the inside of the carriage is brought into communication with the outside air, and even if the carriage is used in a place where the temperature change is large, the temperature change inside the carriage becomes gradual and an environment where the temperature does not rise excessively is maintained.

An eighth aspect of the present invention for achieving the above object is characterized in that the carriage of the liquid jet recording head according to any one of the first to seventh aspects is connected to a reciprocating means. It is in a liquid jet recording apparatus.
According to the eighth aspect, the liquid jet recording apparatus includes the liquid jet recording head in which the temperature change inside the carriage is reduced even when the environment temperature change is large.

According to a ninth aspect of the present invention, in the liquid jet recording apparatus according to the eighth aspect, the cap includes a cap that seals the nozzle opening at a predetermined position of the carriage, and the cap seals between the carriage. The liquid jet recording apparatus includes a stopper.
In the ninth aspect, the carriage of the liquid jet recording head can be sealed using existing components.

  FIG. 1 shows a schematic configuration of an ink jet recording apparatus (liquid ejecting recording apparatus) including an ink ejecting head (liquid ejecting recording head) according to an embodiment of the present invention, and FIG. 2 shows the inside of the ink ejecting head. FIG. 3 is a sectional view showing the whole of the ink jet head, FIG. 4 is a detailed state of the opening and closing member, FIGS. 5 and 6 are operating states of the opening and closing member, and FIG. The change with time is shown.

  As shown in FIG. 1, the ink jet recording apparatus 1 has an ink ejecting head 5 as a recording head main body in which a carriage 3 on which an ink cartridge 2 is mounted and a recording head 4 attached to the carriage 3 are integrated. is doing. As will be described in detail later, the carriage 3 is formed of a housing that seals the ink jet head 5 in a heat-insulated state (the housing portion is omitted in FIG. 1). The carriage 3 is connected to a stepping motor 7 via a timing belt 6 and is guided by a guide bar 8 to reciprocate in the paper width direction (main scanning direction) of the recording paper 9. The carriage 3 has a nozzle surface opening (details will be described later) in which the nozzle surface of the recording head 4 is exposed on the surface (lower surface) facing the recording paper 9, and the ink cartridge 2 is accommodated in the carriage 3.

  Ink is supplied from the ink cartridge 2 to the recording head 4, and ink droplets are ejected onto the upper surface of the recording paper 9 while moving the carriage 3 to print images and characters on the recording paper 9 in a dot matrix. . Reference numeral 10 in FIG. 1 denotes a cap that seals the carriage 3 formed of a housing by sealing a nozzle surface opening that exposes the nozzle surface of the recording head 4 during a printing pause. Since the cap 10 seals the nozzle surface opening, the nozzle is prevented from drying, and a negative pressure is applied to the nozzle surface of the recording head 4 to enable a cleaning operation. Further, reference numeral 11 in FIG. 1 is a wiper blade for wiping the nozzle surface of the recording head 4, reference numeral 12 is a waste ink storage section for storing waste ink sucked by the cleaning operation, and reference numeral 13 is an ink jet type. 2 is a control device that controls the operation of the recording apparatus 1.

The structure of the ink jet head 5 will be described with reference to FIG.
As shown in the figure, a flow path unit 17 is disposed at the tip of the recording head 4, and the flow path unit 17 is provided with a nozzle plate 19 in which nozzle openings 20 are arranged. A pressure generation chamber 21 that communicates with the nozzle opening 20 and pressurizes ink by the piezoelectric vibrator 16 is provided, and ink is supplied to the pressure generation chamber 21 from the ink storage chamber. That is, the flow path unit 17 is a space corresponding to the nozzle plate 19 in which the nozzle openings 20 are formed, the ink storage chamber that is a common liquid storage chamber with the pressure generation chamber 21, and the ink supply path that communicates these. And a sealing plate that seals the opening of the pressure generation chamber 21 and the ink storage chamber, that is, the vibration plate 25 is laminated. The flow path unit 17 is joined to the head case 18 using an adhesive.

  The ink ejection head 5 is provided with a control board 15, and an operation signal from the control device 13 (see FIG. 1) is input to the piezoelectric vibrator 16 via the control board 15. The control board 15 is arranged along the portion of the head case 18 opposite to the flow path unit 17, that is, along the upper surface of the head case 18.

  The piezoelectric vibrator 16 is a so-called longitudinal vibration mode vibrator that contracts in the longitudinal direction in a charged state in response to the input of a drive signal and expands in the longitudinal direction in the process of discharging from the charged state. The piezoelectric vibrator 16 has a tip fixed to a vibration plate 25 that forms a part of the pressure generating chamber 21, and the other end fixed to a base 26. The longitudinal vibration mode piezoelectric vibrator 16 may be changed to a flexural vibration mode piezoelectric vibrator. A head flow path 27 is formed in the head case 18 at a portion corresponding to the ink storage chamber, and the ink of the ink cartridge 2 (see FIG. 1) is introduced into the ink storage chamber via the head flow path 27. In the recording head 4, the pressure generating chamber 21 expands and expands in response to the contraction / extension of the piezoelectric vibrator 16, and ink suction and ink droplet ejection are performed by pressure fluctuations in the pressure generating chamber 21.

  The ink sent from the ink cartridge (see FIG. 1) flows into the ink storage chamber from the head flow path 27, and then is pressurized by the operation of the piezoelectric vibrator 16 in the pressure generation chamber 21 and recorded from the nozzle opening 20. Printing proceeds by being ejected in the form of ink droplets toward paper 9 (see FIG. 1). The configuration of the recording head 4 is not limited to the configuration in the illustrated example, and an elastic film is provided on the flow path forming substrate in which the pressure generating chamber is formed, and the elastic film is deformed by driving the piezoelectric element to drop ink droplets. It is also possible to apply a configuration for discharging from a nozzle.

  The ink ejection head 5 is configured in a state where the recording head 4 is coupled to a head holder 41 corresponding to the carriage 3 (see FIG. 1). An ink supply needle 31 that enters the ink cartridge 2 (see FIG. 1) is attached to the top of the head holder 41. The base of the ink supply needle 31 communicates with the introduction channel 33, and the tip of the introduction channel 33 communicates with the head channel 27. Ink from the ink cartridge (see FIG. 1) is sent to the pressure generating chamber 21 via the ink supply needle 31, the introduction flow path 33 and the head flow path 27.

The overall structure of the ink ejecting head 5 will be described with reference to FIG.
As shown in the drawing, a plurality of (six in the illustrated example) ink cartridges 2 are mounted on the head holder 41 of the ink ejecting head 5, and the entire ink ejecting head 5 on which the ink cartridge 2 is mounted is mounted on the carriage 3. Has been. The carriage 3 is formed of a housing that seals the recording head main body including the recording head 4, the ink ejecting head 5, and the ink cartridge 2 in a thermally insulated state.

  That is, the carriage 3 includes a main body 43 that has a nozzle surface opening 42 that exposes the nozzle surface of the recording head 4 and that is open at the top, and a ceiling plate 45 is fixed to the open surface of the main body 43 via a seal 44. ing. The main body 43 and the ceiling board 45 have a double structure, and a heat insulating material 46 is filled in the hollow part of the double structure. Note that the configuration in which the recording head is insulative is replaced with a configuration in which the carriage itself is made of a low thermal conductivity material or a material that reflects heat is pasted on the surface, instead of the configuration in which the heat insulating material 46 is filled. Is also possible. Further, the space filled with the heat insulating material 46 may be in a vacuum state.

  Further, the cap 10 is provided with a lip portion 48 that seals the nozzle surface opening 42 of the main body 43. When the power is turned off, the cap 10 moves from the position of the dotted line to the nozzle surface of the recording head 4. The lip portion 48 is fitted on the nozzle surface opening 42 of the main body 43 while being covered. That is, the recording head main body is sealed in the carriage 3 in a thermally insulated state. By using the cap 10 as a sealing part of the carriage 3, the carriage 3 can be sealed using existing parts.

  An opening 51 is provided in the vicinity of the bottom of the ceiling plate 45 and the main body 43 constituting the carriage 3, and the opening 51 can be freely opened and closed by a valve member 52 as an opening and closing member. That is, the opening part 51 provided with the valve member 52 is provided at two places above and below the carriage 3. Specifically, when the environmental temperature is in the normal temperature range, the opening 51 is opened so that the environmental temperature matches the inside of the carriage 3. When the environmental temperature rises, the opening 51 is closed, the carriage 3 is sealed, and the recording head main body is thermally insulated from the environmental temperature. The number of openings 51 provided with the valve member 52 can be appropriately selected depending on the size, shape, etc., and can be provided at one place or three or more places. Further, the place to be provided is not limited to the illustrated example, and can be provided at any place.

The detailed structure of the opening 51 and the valve member 52 will be described with reference to FIG.
As shown in the figure, a communication hole 55 is provided in the ceiling plate 45 (main body 43) of the carriage 3, and a valve main body 56 is provided so as to cover the communication hole 55. An opening 57 is formed in the lower wall surface of the valve body 56, and a support shaft portion 58 is attached inside the valve body 56. The support shaft portion 58 is loosely fitted into the communication hole 55, and the inside and outside of the carriage 3 are in communication with each other through the gap between the communication hole 55 and the support shaft portion 58 and the opening 57.

  A seal body 61 is slidably provided on the support shaft portion 58. When the seal body 61 slides downward in FIG. 4, the opening 57 is closed and the inside and outside of the carriage 3 are blocked. . An opening spring 62 that urges the seal body 61 in a direction to open the opening 57 (upper side in FIG. 4) is provided, and a shape memory alloy spring 63 is provided on the opposite side of the opening spring 62 across the seal body 61. . When the shape memory alloy spring 63 reaches a predetermined temperature T ° C. or higher, for example, 32 ° C. or higher, the seal body 61 in a direction (lower side in FIG. 4) closes the opening 57 against the biasing force of the opening spring 62. Is deformed, that is, expanded. When the shape memory alloy spring 63 falls below a predetermined temperature, the shape memory alloy spring 63 is not deformed as shown in FIG.

  The predetermined temperature at which the shape memory alloy spring 63 is deformed is set, for example, to the same temperature as the set temperature at the start of cleaning when the power is turned on. For this reason, the atmosphere in the carriage 3 can be adjusted to the operating temperature range in accordance with the operation of sucking ink. The temperature at which the shape memory alloy spring 63 is deformed can be set to an arbitrary temperature by adjusting the composition.

  The configuration of the valve member 52 that opens and closes the opening 51 is not limited to a configuration that opens and closes according to a temperature change, and may be configured to open and close manually. It is also possible to provide a driving means that is driven according to the temperature so as to be opened and closed. Furthermore, it is also possible to adopt a configuration in which the opening 51 is opened and closed by a member that deforms into a state in which the volume changes according to a temperature change.

  The operation state according to the temperature change in the head body sealed by the carriage 3 will be described with reference to FIGS. For example, it is assumed that the ink jet recording apparatus 1 is left inside a vehicle such as an automobile. 5 and 6, details of the recording head body including the recording head 4, the ink ejecting head 5, and the ink cartridge 2 are omitted.

  As shown in FIGS. 5 and 7, the temperature inside the vehicle, which is the environmental temperature, is lower than a predetermined temperature T ° C. (for example, 32 ° C.) until the time t1 when the temperature immediately after being left is low, and the shape memory alloy spring 63 contracts. In this state, the seal body 61 is biased by the opening spring 62. The sealing body 61 moves in the direction of opening the opening 57 by the biasing of the opening spring 62, and the opening 57 is opened. By opening the opening 57, the air in the vehicle is introduced into the carriage 3 from the opening 51 on the main body 43 side, and the air in the carriage 3 is discharged to the outside from the opening 51 on the ceiling plate 45 side. Thereby, the temperature in the carriage 3 is maintained at a temperature close to the environmental temperature, and the recording head main body is maintained in an environment close to the environmental temperature.

  As shown in FIGS. 6 and 7, the temperature inside the carriage 3 rises as the temperature inside the vehicle rises, and when the temperature inside the vehicle reaches a predetermined temperature T ° C. or higher (time t1), the shape memory alloy spring 63 is The deformation is performed so that the seal body 61 is moved in a direction to close the opening 57 against the urging force of the opening spring 62, and the opening 57 is closed. By closing the opening 57, the carriage 3 is sealed in a heat insulating state, and even if the temperature in the vehicle rises, the temperature rise in the carriage 3 is maintained in a gradual state. As a result, the recording head main body is maintained in an environment where the temperature rise is moderate.

  As shown in FIGS. 5 and 7, when the temperature of the outside air decreases and the temperature in the vehicle decreases, or when the temperature in the vehicle decreases due to the use of an air conditioner or the like, the temperature in the vehicle decreases to a predetermined temperature T ° C. (for example, (Time t2). When the temperature inside the vehicle falls below the predetermined temperature T ° C., the shape memory alloy spring 63 is contracted, the biasing force of the opening spring 62 biases the seal body 61, and the opening 57 is opened again. When the opening 57 is opened, the air in the vehicle whose temperature has been lowered is introduced into the carriage 3 that has been insulated, and the temperature in the carriage 3 is lowered to a temperature close to the environmental temperature. As a result, the recording head main body is maintained in an environment at a temperature lowered to a temperature close to the environmental temperature.

  Since the valve member 52 described above uses the shape memory alloy spring 63, the seal body 61 operates gradually, the air is not rapidly replaced, and the temperature change in the carriage 3 is abrupt. Does not occur. Further, since the valve member 52 operates according to changes in the environmental temperature, no power is required for operation.

  Therefore, even if the ink jet recording apparatus 1 is left in a vehicle such as an automobile parked under a hot sun, the temperature in the carriage 3 is maintained at a temperature that does not greatly deviate from the normal temperature range. As a result, the recording head main body is maintained in an environment where the temperature does not greatly deviate from the normal temperature range, and there is no increase in the viscosity of the ink due to evaporation of moisture in the ink, or clogging of the ink flow path due to drying, sticking, etc. Even if left unattended, printing defects such as missing print dots do not occur. Further, since the temperature in the carriage 3 is maintained at a temperature that does not greatly deviate from the normal temperature range, the temperature in the carriage 3 is not exposed to an environment of rapid temperature changes even when an air conditioner or the like is used. Due to the difference in thermal expansion / contraction rate, no peeling or dropping occurs on the bonded parts.

  According to the above-described embodiment, since the temperature change in the carriage 3 can be moderated and maintained in a temperature range that does not deviate from the normal temperature range, an environment in which the temperature does not increase excessively is maintained, and the environmental temperature decreases. If this happens, outside air can be automatically introduced to lower the internal temperature.

  For this reason, the ink jet head 5 and the ink jet recording apparatus 1 can be provided without any risk of deterioration in function even when used in a place where the temperature environment changes greatly.

  In the embodiment described above, the valve member 52 is closed to insulate the carriage 3 when the environmental temperature rises. However, when the environmental temperature falls, the carriage 3 is sealed to maintain the internal temperature. It is also possible to adopt a configuration.

1 is a schematic configuration diagram of an ink jet recording apparatus according to an embodiment of the present invention. FIG. 6 is a cross-sectional view illustrating an internal structure of the ink ejecting head. 2 is a cross-sectional view illustrating the entire ink ejecting head. FIG. It is detail sectional drawing of an opening-and-closing member. It is operation | movement condition explanatory drawing of an opening-and-closing member. It is operation | movement condition explanatory drawing of an opening-and-closing member. It is a graph showing the time-dependent change of an opening-and-closing member and temperature.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet recording device, 4 Recording head, 5 Ink jet head, 10 Cap, 43 Main body, 45 Ceiling board, 46 Heat insulating material, 51 Opening part, 52 Valve member, 55 Communication hole 56 Valve main body, 62 Opening spring, 63 shape Memory alloy spring

Claims (9)

  A liquid jet type recording head having a recording head main body having a plurality of nozzle openings for supplying liquid from a liquid cartridge and discharging droplets, and the recording head main body is mounted on the carriage. The carriage insulates the recording head main body. A liquid jet type recording head, characterized in that the liquid jet type recording head is provided with an opening / closing member which is formed by a casing sealed with a nozzle and which has an opening in the casing and opens and closes the opening. The liquid jet recording head according to claim 1, wherein the opening / closing member is a valve member that opens and closes the opening according to a change in environmental temperature. The liquid jet recording head according to claim 2, wherein the valve member operates to close the opening when the environmental temperature becomes equal to or higher than a predetermined temperature. The liquid jet recording head according to claim 3, wherein the opening provided with the valve member is provided at least at two positions above and below the carriage. It has a function to detect the temperature when the power is turned on and suck the liquid,
5. The liquid jet recording head according to claim 3, wherein the predetermined temperature at which the valve member is closed is a temperature at which a function of sucking the liquid is operated. The liquid jet recording head according to any one of claims 2 to 5, wherein the valve member is operated by a shape memory alloy that is deformed by a temperature change. A liquid jet type recording head having a recording head main body having a plurality of nozzle openings for supplying liquid from a liquid cartridge and discharging droplets, and the recording head main body is mounted on the carriage. The carriage insulates the recording head main body. A valve that is formed in a housing that seals with the inside, and that has an opening that communicates the inside and outside of the housing at two locations above and below the carriage, and that operates to close the opening when the environmental temperature exceeds a predetermined temperature Comprising a member,
The opening is composed of a valve body having an opening, and the valve member has a sealing body that is supported by the valve body so as to be reciprocally movable, an opening spring that urges the sealing body to open the opening, and an environmental temperature is predetermined. A liquid-jet recording head, comprising: a shape memory alloy spring that is deformed so as to move the seal body in a state in which the opening is closed against the biasing force of the opening spring when the temperature is higher than the temperature.   8. A liquid jet recording apparatus, wherein the carriage of the liquid jet recording head according to claim 1 is connected to a reciprocating means. 9. The liquid jet recording apparatus according to claim 8, further comprising a cap that seals the nozzle opening at a predetermined position of the carriage, and the cap is provided with a sealing portion that seals between the cap and the carriage. .

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