Lens, lens array having same and method for making same

The present disclosure relates to a method for making a lens. In step 1, a first light pervious substrate and a second light pervious substrate are provided. The first light pervious substrate includes a first surface and an opposite second surface, and the second light pervious substrate includes a third surface and a fourth surface. In step 2, a first optically active part is formed on the first surface of the first light pervious substrate. In step 3, a second optically active part is formed on the third surface of the second light pervious substrate. In step 4, the fourth surface of the second light pervious substrate is attached to the second surface of the first light pervious substrate in such a manner that the first and the second optically active parts have a common optical axis.

BACKGROUND

1. Technical Field

The present disclosure relates to a lens, a lens array having the lens and method for making the lens.

2. Description of Related Art

In imprinting process, a double-sided imprinting mold is usually employed to produce a convex lens having double convex optically active parts. However, the double-sided imprinting mold is expensive. Furthermore, it is difficult to produce lenses in large quantity using the double-sided imprinting mold.

Therefore, a new method is desired to overcome the above-mentioned problems.

DETAILED DESCRIPTION

Embodiments will now be described in detail below with reference to the drawings.

Referring toFIG. 1, a lens array100according to an exemplary embodiment is shown. The lens array100includes a first light pervious substrate110, a second light pervious substrate120, a plurality of first optically active parts140and a plurality of second optically active parts150. The first light pervious substrate110includes a first surface112and an opposite second surface114. The second light pervious substrate120includes a third surface122and a fourth surface124. The second surface114of the first light pervious substrate110is adhered to the fourth surface124of the second light pervious substrate120. The first optically active parts140are formed on the first surface112of the first light pervious substrate110. The second optically active parts150are formed on the third surface122of the second light pervious substrate120. Each first optically active part140and a corresponding second optically active part150have a common optical axis M.

A method for making the lens array100will be described in detail.

In step1, referring toFIG. 2, a first light pervious substrate110and a second light pervious substrate120are provided. The first light pervious substrate110includes a first surface112and an opposite second surface114. The second light pervious substrate120includes a third surface122and a fourth surface124. The first and the second light pervious substrate110,120can be made of polymethyl methacrylate (PMMA).

In step2, referring toFIG. 3, an imprinting mold130is provided. The imprinting mold130includes a surface134and a plurality of molding cavities132defined in the surface134. A to-be-solidified material136is applied in the molding cavities132. The material136can be liquid or molten material. The material136can be, for example, epoxy ester.

In step3, referring toFIG. 4, the imprinting mold130is pressed towards the first light pervious substrate110in such a manner that the surface134of the imprinting mold130is in contact with the first surface112of the first light pervious substrate110. Subsequently, the to-be-solidified material136is solidified by, e.g., ultraviolet light.

In step4, referring toFIG. 5, the imprinting mold130is removed from the first light pervious substrate110, thus forming a plurality of first optically active parts140.

In step5, referring toFIG. 6, a plurality of second optically active parts150are formed on third surface122of the second light pervious substrate120using a method similar to the above method of forming the first optically active parts140.

In step6, referring toFIG. 1again, the second surface114of the first light pervious substrate110is attached to the fourth surface124of the second light pervious substrate120such that each first optically active part140and a corresponding second optically active part150have a common optical axis M. Accordingly, a lens array100including a plurality of lenses, one of which is shown inFIG. 8, is formed.

It should be noted that the lens array100can be cut into a plurality of individual lenses200, one of which is shown inFIG. 8.

While certain embodiments have been described and exemplified above, various other embodiments from the foregoing disclosure will be apparent to those skilled in the art. The present invention is not limited to the particular embodiments described and exemplified but is capable of considerable variation and modification without departure from the scope of the appended claims.