Trays and tray stacks

1 . A tray system comprising:

a tray, wherein the tray comprises:

a tray body portion;

a loading portion in the tray body portion, the loading portion configured to accommodate a first object;

a stopper in the loading portion, the stopper configured to overlap, in a thickness direction of the tray, with the first object in a case where the first object is accommodated in the loading portion, and the stopper is further configured to contact a second object below the tray; and

a stepped portion comprising a step in a portion of the stopper, the stepped portion configured to, in the thickness direction of the tray, overlap with and be spaced apart from the second object in a case where the stopper contacts the second object,

wherein the loading portion comprises a bottom surface that is configured to contact the first object in the case where the first object is accommodated in the loading portion,

wherein the stopper and the stepped portion are in the bottom surface of the loading portion, and

wherein the stepped portion protrudes downward from the bottom surface at the portion of the stopper.

2 . The tray system of claim 1 , wherein the loading portion is at a center of the tray body portion in a horizontal direction of the tray body portion.

3 . The tray system of claim 1 , wherein the loading portion is recessed downward from the tray body portion to have a same shape as the first object.

4 . The tray system of claim 1 , wherein the stopper protrudes downward from the bottom surface.

5 . The tray system of claim 1 , wherein the stopper has a rectangular shape in a plan view along a periphery of the loading portion.

6 . The tray system of claim 1 , wherein the stopper comprises a semicircular cross-sectional shape.

7 . The tray system of claim 1 , wherein a height from the bottom surface of the loading portion to a lower surface of the stopper is greater than a height from the bottom surface of the loading portion to a lower surface of the stepped portion.

8 . The tray system of claim 1 , wherein the stepped portion comprises a semicircular cross-sectional shape.

9 . A tray system comprising:

a first object, wherein the first object comprises:

an upper protective film on an upper surface of the first object; and

a lower protective film on a lower surface of the first object; and

a tray, wherein the tray comprises:

a tray body portion;

a loading portion in the tray body portion, the loading portion configured to accommodate the first object;

a stopper in the loading portion, the stopper configured to overlap, in a thickness direction of the tray, with the first object in a case where the first object is accommodated in the loading portion, and the stopper is further configured to contact a second object below the tray; and

a stepped portion comprising a step in a portion of the stopper, the stepped portion configured to, in the thickness direction of the tray, overlap with and be spaced apart from the second object in a case where the stopper contacts the second object.

10 . The tray system of claim 9 , wherein the lower protective film includes:

an opening exposing a part of the lower surface of the first object.

11 . The tray system of claim 10 , wherein the first object further comprises:

an upper cover sheet on the upper protective film; and

a lower cover sheet on the lower protective film.

12 . The tray system of claim 11 , wherein

the lower cover sheet closes the opening of the lower protective film, and

the lower cover sheet is in contact with the lower protective film.

13 . The tray system of claim 10 , wherein the stepped portion overlaps with the opening in a plan view.

14 . The tray system of claim 1 , wherein the tray body portion further comprises:

a guide groove at an edge of the loading portion, the guide groove configured to guide extraction of the first object.

15 . The tray system of claim 1 , wherein the tray body portion comprises a rectangular shape.

16 . A tray stack system comprising:

a plurality of trays that are configured to be stacked on each other sequentially, wherein each of the plurality of trays comprises:

a tray body portion;

a loading portion in the tray body portion, the loading portion configured to accommodate an object;

a stopper in the loading portion, the stopper configured to overlap, in a thickness direction of the plurality of trays, with the object in a case where the object is accommodated in the loading portion; and

a stepped portion comprising a step in a portion of the stopper,

wherein the plurality of trays comprises a first tray and a second tray, the second tray configured to be stacked on the first tray,

wherein the stopper of the second tray is configured to contact the object of the first tray in a case where the second tray is stacked on the first tray and the object is accommodated in the first tray, and

wherein the stepped portion of the second tray is configured to, in the thickness direction of the plurality of trays, overlap with and be spaced apart from the object of the first tray in the case where the second tray is stacked on the first tray and the object is accommodated in the first tray.

17 . The tray stack system of claim 16 , further comprising:

the object,

wherein the first tray accommodates the object in the loading portion, and the second tray is stacked on the first tray,

wherein the object of the first tray is in contact with the stopper of the second tray, and

wherein the stepped portion of the second tray overlaps with, in the thickness direction, and is spaced apart from, in the thickness direction, the object of the first tray.

18 . The tray stack system of claim 17 , wherein the object further comprises:

an upper protective film on an upper surface of the object;

a lower protective film on a lower surface of the object;

an upper cover sheet on the upper protective film; and

a lower cover sheet on the lower protective film,

wherein the lower protective film includes an opening that is covered by the lower cover sheet, and

wherein the opening of the lower protective film of the object in the first tray overlaps with the stepped portion of the second tray in the thickness direction of the plurality of trays.

19 . The tray system of claim 1 , wherein the stopper is configured to overlap with a periphery of the first object in the case where the first object is accommodated in the loading portion.

20 . The tray stack system of claim 16 , wherein the stopper is configured to overlap with a periphery of the object in the case where the object is accommodated in the loading portion.