# Patent

## Title
Tray used in an optical disk drive

## Abstract

The present invention relates to a tray used in an optical disc drive. At least two aligning means arranged in the tray for marking an aligning line at a front side and a back side of the tray, respectively. The aligning line is used for determining the dimensional accuracy of each component located on the front side and back side of the tray, respectively.

## Background
FIELD OF THE INVENTION
The present invention relates to a tray used in an optical disc drive, and particularly to having aligning means formed integrally with the tray and the aligning line formed through the aligning means used for determining the dimensional accuracy of each component located on the front side and back side of the tray, respectively.
BACKGROUND OF THE INVENTION
FIG. 1 shows the structural diagram of a front side of a tray of a conventional optical disc drive, and FIG. 2 shows a structural diagram of a back side of the tray of the FIG. 1. After the conventional tray 10 is made, e.g. the conventional tray 10 made by using an extrusion, the tray 10 has to be measured precisely to make sure the size of each component arranged on the tray 10 and the relative sizes between the components. These sizes must meet a product specification such that they can be really arranged in the optical disc drive. After a measurer finishes measuring each component on the front side of the tray 10, he will continue to measure each component on the back side of the tray 10. Since the front side and the back side of the tray 10 do not have a common measuring standard, when measuring the back side of the tray 10, the tray 10 has to be turned to the back side from the front side. However, as soon as the tray 10 moves, the measuring standard will have deviation, and the tray 10 cannot precisely keep the measuring standard used by the front side and that used by the back side. Therefore, it is hard to measure the tray 10 more precisely.
In view of the shortcomings of the above mentioned prior art, the inventor of the present invention wants to improve and invents a tray with a measuring dimensional accuracy mechanism.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a tray with a measuring dimensional accuracy mechanism.
To achieve the above mentioned object of the present invention, the present invention provides a tray-used in an optical disc drive which comprises: at least two aligning means arranged in a tray for marking an aligning line on a front side and a back side of the tray, respectively; and the aligning line is used for determining a dimensional accuracy of each component located on the front side and back side of the tray, respectively.



BRIEF DESCRIPTION OF THE DRAWINGS
The present invention can be more fully understood by reference to the following description and accompanying drawings, in which:
FIG. 1 shows a structural diagram of a front side of a tray of an conventional optical disc drive;
FIG. 2 shows a structural diagram of a back side of the tray of the FIG. 1;
FIG. 3 shows the aligning means arranged in the front side of the tray of the present invention; and
FIG. 4 shows a structural diagram of the back side of the tray corresponding to the aligning means in FIG. 3.



DETAILED DESCRIPTION OF THE INVENTION
FIG. 3 shows aligning means arranged in the front side of the tray of the present invention, and FIG. 4 shows a structural diagram of the back side of the tray corresponding to the aligning means in FIG. 3. Each component is respectively located on the front side and back side of the tray 20 of the present invention, such as carrier plane 201 for carrying an optical disk, longitudinal rack 203, etc., and aligning means 30 are formed integrally and simultaneously. After the tray 20 is made, e.g. the tray 20 is made of a plastic material in extrusion and formed integrally, for ensuring the made tray 20 completely meets the dimensional requirement of the product specification, it is necessary to measure the tray 20. Since the tray 20 of the present invention has a feature of aligning means 30, the measurer can obtain an aligning line A-A by drawing a line through the aligning means 30. From the aligning line A-A obtained on the front side of the tray 20 and a protruding point D, please refer to the aligning line A-A shown in FIG. 3, an aligning line B-B, aligning line C-C, can be obtained. The protruding point D is a center position of the carrier plane 201. Next, using the protruding point D, each component located on the front side of the tray 20 are measured to determine whether each component completely meets the dimensional requirement of the product specification. For example, measure whether the length of the circumference of the carrier plane 201 completely meets the dimensional requirement of the product specification. Similarly, the measurer can use the aligning means 30 through the back side of the tray 20 and draw a line to obtain an aligning line A-A. From the aligning line A-A obtained on the back side of the tray 20 and a protruding point D, please refer to the aligning line A-A shown in FIG. 4, an aligning line B-B, aligning line C-C, can be obtained. The protruding point D is a center position of the carrier plane 201. Next, using the protruding point D, each component located on the back side of the tray 20 are measured to determine whether each component completely meets the dimensional requirement of the design product specification. For example, measure whether the longitudinal rack 203 on the back side of the tray 20 completely meets the dimensional requirement of the product specification.
Since each aligning means 30 of the present invention is arranged at exactly the same position on the front surface and the back surface of the tray 20, the aligning lines A-A respectively obtained on the front surface and the back surface of the tray 20 by the measurer are the same aligning lines. The protruding points D on the front surface and the back surface from the same aligning line are the same center point.
The alignment means 30 shown in FIG. 3 and FIG. 4 have embodiments of through holes 30 through the front side and back side of the tray 20. Further, another embodiment of the aligning means 30 is a prominent means projecting outward from the front side and back side of the tray 20, e.g. the prominent means as a spur, such as protruding point D. As such, the protruding points D integrally with the tray 20 for improving the precision of the measurement. Of course, the aligning means 30 of the present invention is not limited to the through hole 30 and the prominent means. Persons skilled in the art can change to other types of aligning means 30 according to the principles disclosed in the present invention. However, these changed types of aligning means 30 are also in the scope of the present invention.
Various modifications, changes, and variations apparent to those skilled in the art may be made in the arrangement, operation, and details of the methods and systems of the present invention disclosed herein without departing from the scope of the claimed invention.

## Claims

1. A tray used in an optical disc drive comprising:
a tray portion having at least two aligning means for defining a plurality of non-collinear aligning lines on a front side and a back side of the tray, respectively;
wherein the aligning lines are used for determining a dimensional accuracy of each component located on the front side and back side of the tray portion, respectively.

2. The tray as claimed in claim 1, wherein the at least two aligning means are defined by at least two through holes passing through and formed by the tray portion.

3. The tray as claimed in claim 1, wherein at least two aligning means are at least two prominent means projecting outward from the front side and back side of the tray.

4. The tray as claimed in claim 3, wherein the prominent means is a spur.

5. The tray as claimed in claim 1, wherein the tray is a tray made of a plastic material.

6. The tray as claimed in claim 1, wherein the tray portion includes a carrier plane for carrying an optical disk, a protruding point is located at a center of the carrier plane, and the protruding point is configured to determine whether the components located on the tray meet proper dimensional requirements.

7. The tray as claimed in claim 6, wherein the components include at least one of the carrier plane and a longitudinal rack.