US20110031159A1 - Tray - Google Patents
Tray Download PDFInfo
- Publication number
- US20110031159A1 US20110031159A1 US12/988,996 US98899609A US2011031159A1 US 20110031159 A1 US20110031159 A1 US 20110031159A1 US 98899609 A US98899609 A US 98899609A US 2011031159 A1 US2011031159 A1 US 2011031159A1
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- United States
- Prior art keywords
- tray
- portions
- bottom surfaces
- circuit boards
- stacked
- 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.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
- B65D25/02—Internal fittings
- B65D25/10—Devices to locate articles in containers
- B65D25/103—V-shaped elements, e.g. racks, protuberances projecting from a supporting surface, supporting the articles locally at its sides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/34—Trays or like shallow containers
- B65D1/36—Trays or like shallow containers with moulded compartments or partitions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2585/00—Containers, packaging elements or packages specially adapted for particular articles or materials
- B65D2585/68—Containers, packaging elements or packages specially adapted for particular articles or materials for machines, engines, or vehicles in assembled or dismantled form
- B65D2585/86—Containers, packaging elements or packages specially adapted for particular articles or materials for machines, engines, or vehicles in assembled or dismantled form for electrical components
Definitions
- the present invention relates to a tray, and more specifically relates to a tray for protectively carrying and storing an object having a substantially plate shape such as a circuit board on which electronic components are provided.
- Patent Literature 1 JP 2000-206194 A
- Patent Literature 2 JP 2004-315089 A
- a tray 100 shown in FIG. 6 is configured such that circuit boards 110 that define stored objects are arranged side by side on a plane in a storage concave portion 102 that is surrounded by side walls 104 and has a given size.
- the tray 100 is configured such that an antistatic and impact absorbing sheet 112 (preferably, an expanded sheet) is laid on the circuit boards 110 arranged in the storage concave portion 102 , and another tray 100 can be stacked thereon (i.e., a so-called stackable tray).
- the tray having the configuration described above has the following problems.
- the antistatic and impact absorbing sheet 112 that is laid between the circuit boards 110 and the other tray 110 causes an increase in volume, which increases carriage cost and storage cost of the circuit boards.
- the number of such sheets that become wastes could be large.
- Preferred embodiments of the present invention provide a tray for storing objects having a substantially plate shape that includes angle threads, bottom surfaces, the angle threads and the bottom surfaces being alternately arranged, and mount surfaces on which the stored objects are mounted, the mount surfaces being provided to the angle threads and inclined at a given angle with respect to the bottom surfaces.
- the bottom surfaces include convex portions defined by projecting portions of the bottom surfaces.
- the convex portions are arranged asymmetrically with respect to a perpendicular line bisecting the length of the angle threads.
- the convex portions have a height such that when another tray is stacked on the tray so as to be oriented in a direction 180 degrees opposite to the tray, a distance between an opposite surface to a mount surface of the other tray and the mount surface of the tray is substantially equal to a thickness of the stored objects.
- the tray further includes side walls that surround the angle threads and the bottom surfaces.
- the side walls include leveled portions defined by recessed portions of the side walls.
- the leveled portions are disposed asymmetrically with respect to at least one of a perpendicular line bisecting the length of the tray and a perpendicular line bisecting the width of the tray.
- the leveled portions have a height such that when the other tray is stacked on the tray so as to be oriented in the direction 180 degrees opposite to the tray, the distance between the opposite surface to the mount surface of the other tray and the mount surface of the tray is substantially equal to the thickness of the stored objects.
- the tray further includes orientation discriminating portions arranged asymmetrically with respect to at least one of the perpendicular line bisecting the length of the tray and the perpendicular line bisecting the width of the tray.
- the tray further includes a strengthening rib at an outer periphery of the side walls.
- the tray having the configuration above is made from a foamed resin, especially from foamed polyethylene terephthalate.
- the mount surfaces on which the stored objects having the substantially plate shape are mounted are inclined at the given angle, the stored objects are stably held.
- the number of mount surfaces (angle threads) is fixed, the number of objects to be stored in one tray can be fixed.
- the height of the convex portions such that the distance between the opposite surface to the mount surface of the other tray and the mount surface of the tray is substantially equal to the thickness of the stored objects mounted on the mount surface of the tray, when the other tray is stacked on the tray so as to be oriented in the direction 180 degrees opposite to the tray, the stored objects are caught between the upper and lower trays, which prevents breakage and failure of the stored objects due to vibration.
- the height of the leveled portions such that the distance between the opposite surface to the mount surface of the other tray and the mount surface of the tray is substantially equal to the thickness of the stored objects mounted on the mount surface of the tray, when the other tray is stacked on the tray so as to be oriented in the direction 180 degrees opposite to the tray, the stored objects are caught between the upper and lower trays, which provides excellent vibration resistance.
- the orientation of the tray can be easily discriminated by referring to the orientation discriminating portions, which improves workability of stacking the trays.
- the tray Owing to the strengthening rib at the outer periphery of the side walls, mechanical strength of the tray is improved.
- vibration resistance of the tray can be further improved.
- FIG. 1 is an external view of a tray according to a preferred embodiment of the present invention.
- FIG. 2 is a cross sectional view of the tray shown in FIG. 1 (A-A section in FIG. 1 ).
- FIG. 3 is a plan view of the tray shown in FIG. 1 (viewed from the direction of the arrow B in FIG. 2 ).
- FIG. 4A is an external view of a circuit board that defines a stored object
- FIGS. 4B to 4D are schematic views (cross sectional views) for explaining processes of storing the circuit boards in the trays shown in FIG. 1 .
- FIG. 5 is a schematic view for explaining a test subject that is prepared as an example according to the present invention.
- FIG. 6 is an external view of a conventional tray.
- FIG. 1 is an external view of a tray 1 according to the preferred embodiment of the present invention.
- FIG. 2 is a cross sectional view of the tray 1 (A-A section in FIG. 1 ).
- FIG. 3 is a plan view of the tray 1 (viewed from the direction of the arrow B in FIG. 2 ).
- the vertical (height) direction mentioned in the following descriptions corresponds to the up and down direction in FIG. 2 .
- the tray 1 is a tray for storing circuit boards 90 having a substantially plate shape on which electronic components are provided, and includes a storage portion 30 in which angle threads 10 and bottom surfaces 20 are provided, and side walls 40 that surround the storage portion 30 .
- the tray 1 has a monolithic construction of foamed polyethylene terephthalate having excellent heat resistance and excellent cushioning properties.
- each angle thread 10 and the bottom surfaces 20 are alternately arranged substantially parallel to each other.
- Each angle thread 10 has a cross section that is tapered from the bottom surfaces 20 toward the crest. Surfaces of the angle threads 10 that are inclined at a given angle with respect to the bottom surfaces 20 define mount surfaces 12 .
- the circuit boards 90 that define stored objects are to be mounted on the mount surfaces 12 (details are provided later).
- each mount surface 12 has a cross section that is symmetrical with respect to a line passing through a tip portion 14 of the angle thread 10 and bisecting the angle thread 10 (the line C).
- the bottom surfaces 20 provided between the angle threads 10 define a bottom surface of the tray 1 .
- the bottom surfaces 20 include convex portions 22 defined by projecting portions of the bottom surfaces 20 having a given height, and the convex portions 22 are arranged substantially parallel to the angle threads 10 .
- the convex portions 22 are arranged asymmetrically with respect to a perpendicular line bisecting the length of the angle threads 10 (the tray 1 ) (the line D in FIG. 3 ). It should be noted that the configuration of the convex portions 22 shown in the drawings is given as an example. In the preferred embodiment of the present invention, three convex portions 22 are provided to one bottom surface 20 . However, it is essential only that the convex portions 22 be arranged asymmetrically with respect to the line D, and the number of convex portions 22 may be increased.
- the side walls 40 surround the storage portion 30 in which the angle threads 10 and the bottom surfaces 20 are alternately arranged. As shown in FIG. 2 , the height of the side walls 40 is greater than the height of the angle threads 10 .
- Leveled portions 42 are provided to the storage portion 30 side of the side walls 40 .
- the leveled portions 42 are arranged asymmetrically with respect to the perpendicular line bisecting the length of the tray 1 (the angle threads 10 ) (the line D in FIG. 3 ) and a perpendicular line bisecting the width of the tray 1 (the line E in FIG. 3 ). It should be noted that the configuration of the leveled portions 42 shown in the drawings is given as an example. It is essential only that the leveled portions 42 be arranged asymmetrically with respect to at least one of the line D and the line E.
- a strengthening rib 44 is provided to the outer periphery of the side walls 40 (the edge of the tray 1 ).
- the strengthening rib 44 projects in the horizontal direction from the outer periphery of the side walls 40 and is arranged to enhance mechanical strength of the whole tray 1 against bending stress.
- Orientation discriminating portions 46 are provided at two corners among four corners of the tray 1 .
- the orientation discriminating portions 46 are arranged asymmetrically with respect to the perpendicular line bisecting the width of the tray 1 (the line E in FIG. 3 ).
- the tray 1 is configured such that the convex portions 22 and the leveled portions 42 are arranged asymmetrically, and has orientation.
- the orientation discriminating portions 46 are provided in the preferred embodiment of the present invention in order that the orientation of the tray 1 can be easily discriminated visually by referring to the positions of the orientation discriminating portions 46 .
- the configuration of the orientation discriminating portions 46 in the drawings is given as an example, and it is essential only that the orientation of the tray 1 can be discriminated visually.
- the orientation discriminating portions 46 may be arranged asymmetrically with respect to the perpendicular line E bisecting the width of the tray 1 as in the case of the preferred embodiment of the present invention or may be arranged asymmetrically with respect to the perpendicular line D bisecting the length of the tray (the angle threads 10 ).
- the tray 1 stores the circuit board 90 having the substantially plate shape as shown in FIG. 4A .
- various electronic elements such as resistors and capacitors, connectors for providing electrical connection to the outside, and other elements are provided (this surface is referred to as an electronic component-mounted surface 92 ).
- the length of the mount surface 12 (the angle thread 10 ) of the tray 1 is longer than the length of the circuit board 90 that defines the stored object.
- the circuit boards 90 are stacked such that opposite surfaces to the electronic component-mounted surfaces 92 of the circuit boards 90 are in contact with each other, and are mounted on the mount surfaces 12 .
- two circuit boards 90 are mounted on one mount surface 12 (i.e., four circuit boards 90 are mounted on one angle thread 10 ).
- another tray 1 is stacked on the tray 1 described above as shown in FIG. 4C .
- the other tray 1 is stacked on the tray 1 so as to be oriented in the direction 180 degrees opposite to the tray 1 .
- the orientation discriminating portions 46 can be stacked so as to be oriented in a proper direction speedily and reliably.
- the circuit boards 90 are stored as described above. Thereafter, other trays 1 are stacked thereon one after another so as to be alternately oriented in the directions 180 degrees opposite to one another while the circuit boards 90 are stored in the stacked trays 1 as shown in FIG. 4D .
- the convex portions 22 of the bottom surfaces 20 of the trays 1 are arranged asymmetrically with respect to the perpendicular line bisecting the length of the angle threads 10 (the tray 1 ) (the line D in FIG. 3 ). Therefore, when the vertically adjacent trays 1 are stacked so as to be oriented in the directions 180 degrees opposite to each other, the convex portions 22 of the vertically adjacent trays 1 are not completely superimposed, and at least portions of the convex portions 22 of the lower tray 1 are in contact with the bottom surfaces 20 of the upper tray 1 . Thus, loads of the stacked trays 1 and the circuit boards 90 stored therein are received by the convex portions 22 .
- the tray 1 As described above, according to the tray 1 , the stacked trays 1 and the objects stored therein are supported by the convex portions 22 of the tray 1 . Therefore, loads that are applied on the circuit boards 90 by weights of the stacked trays 1 and the circuit boards 90 stored therein are reduced. In addition, the stacked trays 1 are prevented from biting into one another. Accordingly, it is not necessary to interpose cushion sheets between the circuit boards 90 and the stacked trays 1 , which can reduce the whole size of the trays 1 when stacked.
- the circuit boards 90 that define the stored objects are mounted on the mount surfaces 12 that are inclined at the given angle with respect to the bottom surfaces 20 , and therefore, the circuit boards 90 are stably held.
- the height of the convex portions 22 of the tray 1 is set such that the distance between the opposite surface to the mount surface 12 of the other tray 1 and the mount surface 12 of the tray 1 (the size H in FIG. 4C ) is substantially equal to the thickness of the stored objects (the thickness of the stored objects mounted on one mount surface 12 , and in the preferred embodiment of the present invention, the total thickness of two circuit boards 90 ).
- the circuit boards 90 that define the stored objects are stored so as to be caught between the mount surfaces 12 of the tray 1 in which the circuit boards 90 are stored and the opposite surfaces to the mount surfaces 12 of the other tray 1 that is stacked on the tray 1 .
- the trays 1 that are stacked one above the other prevent the circuit boards 90 from moving, thereby preventing breakage and failure of the circuit boards 90 due to vibration.
- the leveled portions 42 of the sidewalls 40 are arranged asymmetrically with respect to the perpendicular line bisecting the length of the tray 1 (the angle threads 10 ) (the line D in FIG. 3 ) and the perpendicular line bisecting the width of the tray 1 (the line E in FIG. 3 ).
- the height of the leveled portions 42 is substantially equal to the height of the convex portions 22 .
- the leveled portions 42 of the vertically adjacent trays 1 are not completely superimposed, and at least portions of the side walls 40 of the lower tray 1 are in contact with the leveled portions 42 of the upper tray 1 . Accordingly, loads of the stacked trays 1 and the circuit boards 90 stored therein are received not only by the convex portions 22 but also by the leveled portions 42 (the side walls 40 ).
- the stacked trays 1 and the objects stored therein are supported not only by the convex portions 22 but also by the leveled portions 42 (the side walls 40 ). Therefore, the advantageous effect of reducing loads on the circuit boards 90 that define the stored objects is enhanced. In addition, the stacked trays 1 are prevented from biting into one another.
- the tray 1 has a fixed number of mount surfaces 12 on which the circuit boards 90 that define the stored objects are mounted, and the number of circuit boards 90 mounted on one mount surface 12 is fixed. Therefore, the number of circuit boards 90 stored in one tray 1 is fixed. Thus, it is easy to perform number control (stock number control or carriage number control) of the circuit boards 90 that define the stored objects.
- the tray 1 having the configuration according to the preferred embodiment of the present invention was evaluated in the vibration test and the drop test described below. As shown in FIG. 5 , ten trays 1 having the shape given in Table 1 below (made from foamed polyethylene terephthalate) and storing circuit boards having the shape given in Table 2 below (one tray 1 stores 40 circuit boards) were stacked so as to prepare a set 94 , two sets 94 were stacked and packed in a resin case 96 of 317 mm tall, 500 mm wide, and 604 mm long so as to prepare a test subject 98 .
- Table 1 made from foamed polyethylene terephthalate
- circuit boards having the shape given in Table 2 below
- the vibration test was carried out on the test subject.
- the vibration test was performed with the frequency range of 5 to 50 Hz and the sweep time of 3 minutes.
- the vibration time was 15 minutes in an X direction, 15 minutes in a Y direction, and 60 minutes in a Z direction (see FIG. 5 for the X, Y, and Z directions).
- the drop test was carried out on the test subject.
- the drop test was performed with impact points at one corner, three edges, and five surfaces (nine positions A to I in FIG. 5 ).
- the test subject was freely fallen from a height of 25 cm for the corner and the edges and from a height of 32 cm for the surfaces.
- the circuit boards stored in the tray 1 were checked for the presence or absence of uplift and dropping off of chip components provided on the circuit boards and for abnormal appearance such as breakage, failure, and deformation, and were measured for the amount of electrostatic charge.
- circuit board on which the electronic components are provided is given as an example of the stored object in the preferred embodiment of the present invention, the technical idea of the present invention is applicable to any stored object having a substantially plate shape similar to the circuit board.
- the tray 1 is made from foamed polyethylene terephthalate in the preferred embodiment of the present invention, the tray 1 may be made from another foamed resin such as foams of polystyrene, polyethylene, polypropylene, and urethane.
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- Containers Having Bodies Formed In One Piece (AREA)
Abstract
A tray having excellent impact resistance and excellent vibration resistance and capable of stably holding a fixed number of stored objects. A tray (1) for storing objects having a substantially plate shape is configured such that angle threads (10) and bottom surfaces (20) are alternately arranged, the angle threads (10) include mount surfaces (12) that are inclined at a given angle with respect to the bottom surfaces (20) and on which the stored objects are mounted, and the bottom surfaces 20 include convex portions (22) arranged asymmetrically with respect to a perpendicular line bisecting the length of the angle threads.
Description
- The present invention relates to a tray, and more specifically relates to a tray for protectively carrying and storing an object having a substantially plate shape such as a circuit board on which electronic components are provided.
- There are proposed various trays for carrying to a subsequent process a circuit board having a substantially plate shape on which electronic components are provided and storing the circuit board for a given period of time (see
Patent Literatures - Patent Literature 1: JP 2000-206194 A
- Patent Literature 2: JP 2004-315089 A
- A description of a conventional example of the tray for carrying and storing the circuit board will be provided referring to
FIG. 6 . Atray 100 shown inFIG. 6 is configured such thatcircuit boards 110 that define stored objects are arranged side by side on a plane in a storageconcave portion 102 that is surrounded byside walls 104 and has a given size. Thetray 100 is configured such that an antistatic and impact absorbing sheet 112 (preferably, an expanded sheet) is laid on thecircuit boards 110 arranged in the storageconcave portion 102, and anothertray 100 can be stacked thereon (i.e., a so-called stackable tray). - However, the tray having the configuration described above has the following problems.
- First, no partitions between the
circuit boards 110 are provided to the storageconcave portion 102, and accordingly, thecircuit boards 110 easily move during carriage. Thus, there are many occasions of breakage and failure of thecircuit boards 110 due to impact and vibration during carriage. - Second, if variously sized circuit boards are stored in the
tray 100, the number of circuit boards stored in onetray 100 could change according to the sizes of the circuit boards. Thus, inconvenience occurs when checking stock quantity and carriage quantity of the circuit boards stored in the tray. - Third, the antistatic and impact absorbing
sheet 112 that is laid between thecircuit boards 110 and theother tray 110 causes an increase in volume, which increases carriage cost and storage cost of the circuit boards. In addition, the number of such sheets that become wastes could be large. - An object of the present invention is to overcome the problems described above and to provide a tray having excellent impact resistance and excellent vibration resistance and capable of stably holding a fixed number of stored objects. Another object of the present invention is to provide a tray by which the whole size of trays when stacked can be reduced.
- Preferred embodiments of the present invention provide a tray for storing objects having a substantially plate shape that includes angle threads, bottom surfaces, the angle threads and the bottom surfaces being alternately arranged, and mount surfaces on which the stored objects are mounted, the mount surfaces being provided to the angle threads and inclined at a given angle with respect to the bottom surfaces.
- It is preferable that the bottom surfaces include convex portions defined by projecting portions of the bottom surfaces.
- It is preferable that the convex portions are arranged asymmetrically with respect to a perpendicular line bisecting the length of the angle threads.
- It is preferable that the convex portions have a height such that when another tray is stacked on the tray so as to be oriented in a direction 180 degrees opposite to the tray, a distance between an opposite surface to a mount surface of the other tray and the mount surface of the tray is substantially equal to a thickness of the stored objects.
- It is preferable that the tray further includes side walls that surround the angle threads and the bottom surfaces.
- It is preferable that the side walls include leveled portions defined by recessed portions of the side walls.
- It is preferable that the leveled portions are disposed asymmetrically with respect to at least one of a perpendicular line bisecting the length of the tray and a perpendicular line bisecting the width of the tray.
- It is preferable that the leveled portions have a height such that when the other tray is stacked on the tray so as to be oriented in the direction 180 degrees opposite to the tray, the distance between the opposite surface to the mount surface of the other tray and the mount surface of the tray is substantially equal to the thickness of the stored objects.
- It is preferable that the tray further includes orientation discriminating portions arranged asymmetrically with respect to at least one of the perpendicular line bisecting the length of the tray and the perpendicular line bisecting the width of the tray.
- It is preferable that the tray further includes a strengthening rib at an outer periphery of the side walls.
- It is preferable that the tray having the configuration above is made from a foamed resin, especially from foamed polyethylene terephthalate.
- According to the preferred embodiments of the present invention in which the mount surfaces on which the stored objects having the substantially plate shape are mounted are inclined at the given angle, the stored objects are stably held. In addition, if the number of mount surfaces (angle threads) is fixed, the number of objects to be stored in one tray can be fixed.
- Owing to the configuration that the convex portions defined by the projecting portions of the bottom surfaces between the angle threads are arranged asymmetrically with respect to the perpendicular line bisecting the length of the angle threads, when the other tray is stacked on the tray so as to be oriented in the direction 180 degrees opposite to the tray, loads of the stacked tray and the objects stored therein are received by the convex portions. Accordingly, it is not necessary to interpose a cushion sheet between the stored objects and the stacked tray, which can reduce the whole size of the trays when stacked.
- By setting the height of the convex portions such that the distance between the opposite surface to the mount surface of the other tray and the mount surface of the tray is substantially equal to the thickness of the stored objects mounted on the mount surface of the tray, when the other tray is stacked on the tray so as to be oriented in the direction 180 degrees opposite to the tray, the stored objects are caught between the upper and lower trays, which prevents breakage and failure of the stored objects due to vibration.
- Owing to the side walls that surround the angle threads and the bottom surfaces and include the leveled portions defined by the recessed portions of the side walls and arranged asymmetrical with respect to the perpendicular line bisecting at least one of the length and the width of the tray, loads of the stacked tray and the objects stored therein are received by the leveled portions as in the case of the convex portions. In addition, the whole size of the trays when stacked can be reduced.
- As in the case of the convex portions, by setting the height of the leveled portions such that the distance between the opposite surface to the mount surface of the other tray and the mount surface of the tray is substantially equal to the thickness of the stored objects mounted on the mount surface of the tray, when the other tray is stacked on the tray so as to be oriented in the direction 180 degrees opposite to the tray, the stored objects are caught between the upper and lower trays, which provides excellent vibration resistance.
- Owing to the orientation discriminating portions that are arranged asymmetrically with respect to at least one of the perpendicular line bisecting the length of the tray and the perpendicular line bisecting the width of the tray, the orientation of the tray can be easily discriminated by referring to the orientation discriminating portions, which improves workability of stacking the trays.
- Owing to the strengthening rib at the outer periphery of the side walls, mechanical strength of the tray is improved. By making the tray from a foamed resin, especially from foamed polyethylene terephthalate, vibration resistance of the tray can be further improved.
-
FIG. 1 is an external view of a tray according to a preferred embodiment of the present invention. -
FIG. 2 is a cross sectional view of the tray shown inFIG. 1 (A-A section inFIG. 1 ). -
FIG. 3 is a plan view of the tray shown inFIG. 1 (viewed from the direction of the arrow B inFIG. 2 ). -
FIG. 4A is an external view of a circuit board that defines a stored object, andFIGS. 4B to 4D are schematic views (cross sectional views) for explaining processes of storing the circuit boards in the trays shown inFIG. 1 . -
FIG. 5 is a schematic view for explaining a test subject that is prepared as an example according to the present invention. -
FIG. 6 is an external view of a conventional tray. - A detailed description of a preferred embodiment of the present invention will now be provided with reference to the accompanying drawings.
FIG. 1 is an external view of atray 1 according to the preferred embodiment of the present invention.FIG. 2 is a cross sectional view of the tray 1 (A-A section inFIG. 1 ).FIG. 3 is a plan view of the tray 1 (viewed from the direction of the arrow B inFIG. 2 ). The vertical (height) direction mentioned in the following descriptions corresponds to the up and down direction inFIG. 2 . - As shown in
FIG. 1 , thetray 1 according to the preferred embodiment of the present invention is a tray for storingcircuit boards 90 having a substantially plate shape on which electronic components are provided, and includes astorage portion 30 in whichangle threads 10 andbottom surfaces 20 are provided, andside walls 40 that surround thestorage portion 30. According to the preferred embodiment of the present invention, thetray 1 has a monolithic construction of foamed polyethylene terephthalate having excellent heat resistance and excellent cushioning properties. - In the
storage portion 30, theangle threads 10 and thebottom surfaces 20 are alternately arranged substantially parallel to each other. Eachangle thread 10 has a cross section that is tapered from thebottom surfaces 20 toward the crest. Surfaces of theangle threads 10 that are inclined at a given angle with respect to thebottom surfaces 20 definemount surfaces 12. Thecircuit boards 90 that define stored objects are to be mounted on the mount surfaces 12 (details are provided later). As shown inFIG. 2 , eachmount surface 12 has a cross section that is symmetrical with respect to a line passing through atip portion 14 of theangle thread 10 and bisecting the angle thread 10 (the line C). - The bottom surfaces 20 provided between the
angle threads 10 define a bottom surface of thetray 1. As shown inFIG. 1 , the bottom surfaces 20 includeconvex portions 22 defined by projecting portions of the bottom surfaces 20 having a given height, and theconvex portions 22 are arranged substantially parallel to theangle threads 10. Theconvex portions 22 are arranged asymmetrically with respect to a perpendicular line bisecting the length of the angle threads 10 (the tray 1) (the line D inFIG. 3 ). It should be noted that the configuration of theconvex portions 22 shown in the drawings is given as an example. In the preferred embodiment of the present invention, threeconvex portions 22 are provided to onebottom surface 20. However, it is essential only that theconvex portions 22 be arranged asymmetrically with respect to the line D, and the number ofconvex portions 22 may be increased. - The
side walls 40 surround thestorage portion 30 in which theangle threads 10 and the bottom surfaces 20 are alternately arranged. As shown inFIG. 2 , the height of theside walls 40 is greater than the height of theangle threads 10. Leveledportions 42 are provided to thestorage portion 30 side of theside walls 40. The leveledportions 42 are arranged asymmetrically with respect to the perpendicular line bisecting the length of the tray 1 (the angle threads 10) (the line D inFIG. 3 ) and a perpendicular line bisecting the width of the tray 1 (the line E inFIG. 3 ). It should be noted that the configuration of the leveledportions 42 shown in the drawings is given as an example. It is essential only that the leveledportions 42 be arranged asymmetrically with respect to at least one of the line D and the line E. - A strengthening
rib 44 is provided to the outer periphery of the side walls 40 (the edge of the tray 1). The strengtheningrib 44 projects in the horizontal direction from the outer periphery of theside walls 40 and is arranged to enhance mechanical strength of thewhole tray 1 against bending stress. -
Orientation discriminating portions 46 are provided at two corners among four corners of thetray 1. Theorientation discriminating portions 46 are arranged asymmetrically with respect to the perpendicular line bisecting the width of the tray 1 (the line E inFIG. 3 ). As described above, thetray 1 is configured such that theconvex portions 22 and the leveledportions 42 are arranged asymmetrically, and has orientation. Thus, theorientation discriminating portions 46 are provided in the preferred embodiment of the present invention in order that the orientation of thetray 1 can be easily discriminated visually by referring to the positions of theorientation discriminating portions 46. It should be noted that the configuration of theorientation discriminating portions 46 in the drawings is given as an example, and it is essential only that the orientation of thetray 1 can be discriminated visually. Theorientation discriminating portions 46 may be arranged asymmetrically with respect to the perpendicular line E bisecting the width of thetray 1 as in the case of the preferred embodiment of the present invention or may be arranged asymmetrically with respect to the perpendicular line D bisecting the length of the tray (the angle threads 10). - A description of the operation of the
tray 1 having the configuration described above will be provided referring toFIGS. 4A to 4D . Thetray 1 stores thecircuit board 90 having the substantially plate shape as shown inFIG. 4A . On one surface of thecircuit board 90, various electronic elements such as resistors and capacitors, connectors for providing electrical connection to the outside, and other elements are provided (this surface is referred to as an electronic component-mounted surface 92). - The length of the mount surface 12 (the angle thread 10) of the
tray 1 is longer than the length of thecircuit board 90 that defines the stored object. As shown in the cross sectional view ofFIG. 4B , thecircuit boards 90 are stacked such that opposite surfaces to the electronic component-mountedsurfaces 92 of thecircuit boards 90 are in contact with each other, and are mounted on the mount surfaces 12. To be specific, twocircuit boards 90 are mounted on one mount surface 12 (i.e., fourcircuit boards 90 are mounted on one angle thread 10). By mounting thecircuit boards 90 on the mount surfaces 12 of thetray 1 as described above, storage of thecircuit boards 90 in onetray 1 is completed. - Then, another
tray 1 is stacked on thetray 1 described above as shown inFIG. 4C . Theother tray 1 is stacked on thetray 1 so as to be oriented in the direction 180 degrees opposite to thetray 1. In this occasion, by referring to theorientation discriminating portions 46, theother tray 1 can be stacked so as to be oriented in a proper direction speedily and reliably. In the preferred embodiment of the present invention, if theorientation discriminating portions 46 of thetray 1 are positioned on the upper side when seen from the operator, it is necessary only to position theorientation discriminating portions 46 of the stackedtray 1 on the lower side when seen from the operator. In thestacked tray 1, thecircuit boards 90 are stored as described above. Thereafter,other trays 1 are stacked thereon one after another so as to be alternately oriented in the directions 180 degrees opposite to one another while thecircuit boards 90 are stored in thestacked trays 1 as shown inFIG. 4D . - As described above, the
convex portions 22 of the bottom surfaces 20 of thetrays 1 are arranged asymmetrically with respect to the perpendicular line bisecting the length of the angle threads 10 (the tray 1) (the line D inFIG. 3 ). Therefore, when the verticallyadjacent trays 1 are stacked so as to be oriented in the directions 180 degrees opposite to each other, theconvex portions 22 of the verticallyadjacent trays 1 are not completely superimposed, and at least portions of theconvex portions 22 of thelower tray 1 are in contact with the bottom surfaces 20 of theupper tray 1. Thus, loads of thestacked trays 1 and thecircuit boards 90 stored therein are received by theconvex portions 22. - As described above, according to the
tray 1, thestacked trays 1 and the objects stored therein are supported by theconvex portions 22 of thetray 1. Therefore, loads that are applied on thecircuit boards 90 by weights of thestacked trays 1 and thecircuit boards 90 stored therein are reduced. In addition, thestacked trays 1 are prevented from biting into one another. Accordingly, it is not necessary to interpose cushion sheets between thecircuit boards 90 and thestacked trays 1, which can reduce the whole size of thetrays 1 when stacked. - The
circuit boards 90 that define the stored objects are mounted on the mount surfaces 12 that are inclined at the given angle with respect to the bottom surfaces 20, and therefore, thecircuit boards 90 are stably held. In addition, the height of theconvex portions 22 of thetray 1 is set such that the distance between the opposite surface to themount surface 12 of theother tray 1 and themount surface 12 of the tray 1 (the size H inFIG. 4C ) is substantially equal to the thickness of the stored objects (the thickness of the stored objects mounted on onemount surface 12, and in the preferred embodiment of the present invention, the total thickness of two circuit boards 90). Owing to this configuration, thecircuit boards 90 that define the stored objects are stored so as to be caught between the mount surfaces 12 of thetray 1 in which thecircuit boards 90 are stored and the opposite surfaces to the mount surfaces 12 of theother tray 1 that is stacked on thetray 1. In other words, thetrays 1 that are stacked one above the other prevent thecircuit boards 90 from moving, thereby preventing breakage and failure of thecircuit boards 90 due to vibration. - As described above, the leveled
portions 42 of thesidewalls 40 are arranged asymmetrically with respect to the perpendicular line bisecting the length of the tray 1 (the angle threads 10) (the line D inFIG. 3 ) and the perpendicular line bisecting the width of the tray 1 (the line E inFIG. 3 ). In addition, the height of the leveledportions 42 is substantially equal to the height of theconvex portions 22. Therefore, when thetrays 1 are stacked one above the other so as to be oriented in the directions 180 degrees opposite to one another, the leveledportions 42 of the verticallyadjacent trays 1 are not completely superimposed, and at least portions of theside walls 40 of thelower tray 1 are in contact with the leveledportions 42 of theupper tray 1. Accordingly, loads of thestacked trays 1 and thecircuit boards 90 stored therein are received not only by theconvex portions 22 but also by the leveled portions 42 (the side walls 40). - As described above, according to the
tray 1, thestacked trays 1 and the objects stored therein are supported not only by theconvex portions 22 but also by the leveled portions 42 (the side walls 40). Therefore, the advantageous effect of reducing loads on thecircuit boards 90 that define the stored objects is enhanced. In addition, thestacked trays 1 are prevented from biting into one another. - The
tray 1 has a fixed number of mount surfaces 12 on which thecircuit boards 90 that define the stored objects are mounted, and the number ofcircuit boards 90 mounted on onemount surface 12 is fixed. Therefore, the number ofcircuit boards 90 stored in onetray 1 is fixed. Thus, it is easy to perform number control (stock number control or carriage number control) of thecircuit boards 90 that define the stored objects. - Hereinafter, the present invention will be concretely described with reference to an example.
- The
tray 1 having the configuration according to the preferred embodiment of the present invention was evaluated in the vibration test and the drop test described below. As shown inFIG. 5 , tentrays 1 having the shape given in Table 1 below (made from foamed polyethylene terephthalate) and storing circuit boards having the shape given in Table 2 below (onetray 1stores 40 circuit boards) were stacked so as to prepare aset 94, twosets 94 were stacked and packed in aresin case 96 of 317 mm tall, 500 mm wide, and 604 mm long so as to prepare atest subject 98. -
TABLE 1 Whole size of tray (length, width, height) 543, 446, 245 (mm) Size of storage portion (length, width) 504, 419 (mm) Length of angle thread (bottom surface) 504 (mm) Width of angle thread 26.2 (mm) Height of angle thread 18.2 (mm) Angle of mount surface 35.7 (degree) Width of bottom surface 13.7 (mm) Length of convex portion (three positions) 177, 170, 57 (mm) Width of convex portion 8.8 (mm) Height of convex portion 10.6 (mm) -
TABLE 2 Size of circuit board (length, width, thickness) 500, 20, 1.2 (mm) Weight 34 (g) - Vibration Test
- The vibration test was carried out on the test subject. The vibration test was performed with the frequency range of 5 to 50 Hz and the sweep time of 3 minutes. The vibration time was 15 minutes in an X direction, 15 minutes in a Y direction, and 60 minutes in a Z direction (see
FIG. 5 for the X, Y, and Z directions). - Drop Test
- The drop test was carried out on the test subject. The drop test was performed with impact points at one corner, three edges, and five surfaces (nine positions A to I in
FIG. 5 ). The test subject was freely fallen from a height of 25 cm for the corner and the edges and from a height of 32 cm for the surfaces. - Result
- After each of the vibration test and the drop test, the circuit boards stored in the
tray 1 were checked for the presence or absence of uplift and dropping off of chip components provided on the circuit boards and for abnormal appearance such as breakage, failure, and deformation, and were measured for the amount of electrostatic charge. - In both of the vibration test and the drop test, there were no uplift and dropping off of chip components provided on the circuit boards and no abnormal appearance such as breakage, failure, and deformation of the circuit boards. The amounts of electrostatic charge of the circuit boards were within a range that does not give functional damage to the circuit boards. The results of both of the tests were favorable. The results show that the
tray 1 according to the present invention has excellent shock-absorbing characteristics and excellent antistatic performance. - While preferred embodiments of the present invention have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present invention.
- Although the circuit board on which the electronic components are provided is given as an example of the stored object in the preferred embodiment of the present invention, the technical idea of the present invention is applicable to any stored object having a substantially plate shape similar to the circuit board.
- Although the
tray 1 is made from foamed polyethylene terephthalate in the preferred embodiment of the present invention, thetray 1 may be made from another foamed resin such as foams of polystyrene, polyethylene, polypropylene, and urethane.
Claims (12)
1. A tray for storing objects having a substantially plate shape, the tray comprising:
angle threads;
bottom surfaces, the angle threads and the bottom surfaces being alternately arranged; and
mount surfaces on which the stored objects are mounted, the mount surfaces being provided to the angle threads and inclined at a given angle with respect to the bottom surfaces.
2. The tray according to claim 1 , wherein the bottom surfaces comprise convex portions defined by projecting portions of the bottom surfaces.
3. The tray according to claim 2 , wherein the convex portions are arranged asymmetrically with respect to a perpendicular line bisecting a length of the angle threads.
4. The tray according to claim 3 , wherein the convex portions have a height such that when another tray is stacked on the tray so as to be oriented in a direction 180 degrees opposite to the tray, a distance between an opposite surface to a mount surface of the other tray and the mount surface of the tray is substantially equal to a thickness of the stored object.
5. The tray according to claim 1 , further comprising side walls that surround the angle threads and the bottom surfaces.
6. The tray according to claim 5 , wherein the side walls comprise leveled portions defined by recessed portions of the side walls.
7. The tray according to claim 6 , wherein the leveled portions are arranged asymmetrically with respect to at least one of a perpendicular line bisecting a length of the tray and a perpendicular line bisecting a width of the tray.
8. The tray according to claim 7 , wherein the leveled portions have a height such that when the other tray is stacked on the tray so as to be oriented in the direction 180 degrees opposite to the tray, a distance between the opposite surface to the mount surface of the other tray and the mount surface of the tray is substantially equal to the thickness of the stored objects.
9. The tray according to claim 1 , further comprising orientation discriminating portions that are arranged asymmetrically with respect to at least one of the perpendicular line bisecting the length of the tray and the perpendicular line bisecting the width of the tray.
10. The tray according to claim 5 , further comprising a strengthening rib at an outer periphery of the side walls.
11. The tray according to claim 1 , wherein the tray is made from a foamed resin.
12. The tray according to claim 11 , wherein the foamed resin comprises foamed polyethylene terephthalate.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008111308 | 2008-04-22 | ||
JP2008-111308 | 2008-04-22 | ||
PCT/JP2009/057259 WO2009131014A1 (en) | 2008-04-22 | 2009-04-09 | Tray |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110031159A1 true US20110031159A1 (en) | 2011-02-10 |
Family
ID=41216752
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/988,996 Abandoned US20110031159A1 (en) | 2008-04-22 | 2009-04-09 | Tray |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110031159A1 (en) |
JP (1) | JP5226775B2 (en) |
CN (1) | CN102015465B (en) |
WO (1) | WO2009131014A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016065292A1 (en) * | 2014-10-24 | 2016-04-28 | Sanderson Scott W | Package system for electronic devices |
WO2023287231A1 (en) * | 2021-07-14 | 2023-01-19 | 주식회사 엘지에너지솔루션 | Airtight container for battery cells |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN202295586U (en) * | 2010-12-21 | 2012-07-04 | 柏宝日本公司 | Collecting tray |
US20210313772A1 (en) | 2018-11-01 | 2021-10-07 | Mitsubishi Electric Corporation | Optical semiconductor device and method for manufacturing optical semiconductor device |
CN109539957B (en) * | 2018-11-14 | 2021-04-06 | 上达电子(深圳)股份有限公司 | Brittle disc for detecting FPC board warping and FPC board warping detection method |
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US5303824A (en) * | 1992-12-04 | 1994-04-19 | International Business Machines Corporations | Solder preform carrier and use |
US5305879A (en) * | 1991-12-03 | 1994-04-26 | Burndy Corporation | Package for card edge connectors |
US5360109A (en) * | 1993-04-28 | 1994-11-01 | Molex Incorporated | Packaging tray for electrical connectors |
US6868970B2 (en) * | 2003-04-16 | 2005-03-22 | Illinois Tool Works Inc. | Stackable tray for integrated circuits with corner support elements and lateral support elements forming matrix tray capture system |
US20080035517A1 (en) * | 2006-08-08 | 2008-02-14 | Ngk Insulators, Ltd. | Tray for brittle columnar body |
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JPS53422Y2 (en) * | 1973-08-30 | 1978-01-09 | ||
JPS5510510U (en) * | 1978-07-04 | 1980-01-23 | ||
JPH11106545A (en) * | 1997-10-04 | 1999-04-20 | Yoshino Kogyosho Co Ltd | Foamed sheet made from regenerated polyethylene terephthalate and article packaging tray-like container or partition |
JP2001278239A (en) * | 2000-03-27 | 2001-10-10 | Seiko Epson Corp | Parts housing body and parts transfer device |
JP2003155091A (en) * | 2001-11-20 | 2003-05-27 | Sekisui Plastics Co Ltd | Packaging tray for conveying component |
JP4106225B2 (en) * | 2002-03-20 | 2008-06-25 | サイデック株式会社 | Storage tray for electronic components |
JP2006273333A (en) * | 2005-03-25 | 2006-10-12 | Sekisui Plastics Co Ltd | Tray for packing |
JP4849318B2 (en) * | 2006-03-30 | 2012-01-11 | Tdk株式会社 | Magnet roll container and multi-stage stacked structure thereof |
-
2009
- 2009-04-09 US US12/988,996 patent/US20110031159A1/en not_active Abandoned
- 2009-04-09 CN CN200980114034.0A patent/CN102015465B/en not_active Expired - Fee Related
- 2009-04-09 WO PCT/JP2009/057259 patent/WO2009131014A1/en active Application Filing
- 2009-04-09 JP JP2010509137A patent/JP5226775B2/en not_active Expired - Fee Related
Patent Citations (5)
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US5305879A (en) * | 1991-12-03 | 1994-04-26 | Burndy Corporation | Package for card edge connectors |
US5303824A (en) * | 1992-12-04 | 1994-04-19 | International Business Machines Corporations | Solder preform carrier and use |
US5360109A (en) * | 1993-04-28 | 1994-11-01 | Molex Incorporated | Packaging tray for electrical connectors |
US6868970B2 (en) * | 2003-04-16 | 2005-03-22 | Illinois Tool Works Inc. | Stackable tray for integrated circuits with corner support elements and lateral support elements forming matrix tray capture system |
US20080035517A1 (en) * | 2006-08-08 | 2008-02-14 | Ngk Insulators, Ltd. | Tray for brittle columnar body |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016065292A1 (en) * | 2014-10-24 | 2016-04-28 | Sanderson Scott W | Package system for electronic devices |
US9802747B2 (en) | 2014-10-24 | 2017-10-31 | Ecospan Usa | Package system for electronic devices |
WO2023287231A1 (en) * | 2021-07-14 | 2023-01-19 | 주식회사 엘지에너지솔루션 | Airtight container for battery cells |
Also Published As
Publication number | Publication date |
---|---|
CN102015465A (en) | 2011-04-13 |
JP5226775B2 (en) | 2013-07-03 |
WO2009131014A1 (en) | 2009-10-29 |
JPWO2009131014A1 (en) | 2011-08-18 |
CN102015465B (en) | 2013-06-05 |
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Owner name: SHARP KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MINAMINO, KOHJI;KUSAKAI, SUGURU;REEL/FRAME:025179/0315 Effective date: 20100921 |
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