Glass lens assembly with an elastic adhesive

Abstract

A lens assembly, and a method for providing a lens assembly is disclosed herein. The lens assembly includes a first frame piece with a first edge on the direction in which a viewer of the electronic display would face, the first edge forming a first angle with a second edge; a second frame piece with a third edge on the direction in which a viewer of the electronic display would face, the third edge forming a second angle with a fourth edge; a lens with a first lens edge facing the viewer, a second lens edge and third lens edge connected to the first lens edge and forming a lens angle; a first adhesive layer placed between the second edge and the second lens edge to attach the first frame piece to the lens; and a second adhesive layer placed between the fourth edge and the third lens edge to attach the second frame piece to the lens.

Claims

1. A lens assembly for an electronic display, comprising: a first frame piece with a first edge on a direction in which a viewer of the electronic display would face, the first edge forming a first angle with a second edge; a second frame piece with a third edge on the direction in which the viewer of the electronic display would face, the third edge forming a second angle with a fourth edge; a lens with a first lens edge facing the viewer, a second lens edge and a third lens edge connected to the first lens edge and forming a first lens angle and a second lens angle, respectively; a first adhesive layer placed between the second edge and the second lens edge to attach the first frame piece to the lens; and a second adhesive layer placed between the fourth edge and the third lens edge to attach the second frame piece to the lens, wherein a shape of the lens is a trapezoidal prism, and the first and the second adhesive layers are placed on non-parallel sides of the trapezoidal prism.

2. The lens assembly according to claim 1, wherein the electronic display is integrated into a center stack area of a vehicle.

3. The lens assembly according to claim 1, wherein the first angle and the second angle are less than 90 degrees.

4. The lens assembly according to claim 3, wherein the first and the second lens angles are more than 90 degrees.

5. The lens assembly according to claim 1, wherein the first and the second adhesive layers are defined by a Youngs modulus property ranging from between 0.1 through 10 Mpa.

6. The lens assembly according to claim 1, wherein a size of a gap between the first edge of the lens and at least one of the first adhesive layer and the second adhesive layer is spaced based on a predetermined determination as a function of temperature range, size of the lens and differential coefficient of expansion of the first and the second frame pieces and the lens.

7. The lens assembly according to claim 1, wherein the lens includes a first surface and a second surface, the first surface and the second surface defining opposing sides of the lens, the first surface and the second surface being rectangular shaped, with the first surface have a smaller surface area than the second surface.

8. The lens assembly according to claim 7, wherein the first surface defines a front portion of the electronic display.

9. The lens assembly according to claim 1, further comprising at least a first gap, the first gap being formed by a first surface of the first adhesive layer, and being in between the second edge and the second lens edge.

10. The lens assembly according to claim 1, further comprising at least a second gap, the second gap being formed by a second surface of the first adhesive layer, and being in between the second edge and the second lens edge, the second surface being on an opposing side of the first adhesive layer.

Description

DESCRIPTION OF THE DRAWINGS

(1) The detailed description refers to the following drawings, in which like numerals refer to like items, and in which:

(2) FIG. 1 illustrates an example of a picture frame implementation of an electronic display.

(3) FIG. 2 illustrates an example of a smart phone implementation of an electronic display.

(4) FIG. 3 illustrates an example of an exposed implementation of an electronic display.

(5) FIGS. 4(a)-(e) illustrate a method for providing a lens assembly according to the aspects disclosed herein.

(6) FIG. 5 illustrates an example of the lens assembly shown in FIGS. 4(a)-(e) with various parameters employed for sizing and spacing.

(7) FIGS. 6(a), (b) and (c) illustrate an example of the lens assembly undergoing various environmental conditions that cause thermal coefficient expansion.

(8) FIG. 7 illustrates another advantage of the lens assembly disclosed herein.

DETAILED DESCRIPTION

(9) The invention is described more fully hereinafter with references to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure is thorough, and will fully convey the scope of the invention to those skilled in the art. It will be understood that for the purposes of this disclosure, at least one of each will be interpreted to mean any combination the enumerated elements following the respective language, including combination of multiples of the enumerated elements. For example, at least one of X, Y, and Z will be construed to mean X only, Y only, Z only, or any combination of two or more items X, Y, and Z (e.g. XYZ, XZ, YZ, X). Throughout the drawings and the detailed description, unless otherwise described, the same drawing reference numerals are understood to refer to the same elements, features, and structures. The relative size and depiction of these elements may be exaggerated for clarity, illustration, and convenience.

(10) Electronic displays are situated with lens and attachments for the lenses. The attachments come in different types, such as those shown in FIGS. 1-3. As explained above, the electronic displays may be installed and provided with specific environments, such as a center stack in an automobile. The structures shown below in the following figures are described in the context of a vehicle. However, the various electronic displays may be implemented in other situations.

(11) Disclosed herein are a lens assembly and a method for providing a lens assembly. The concepts disclosed herein provide both an aesthetically pleasing installation while ensuring the structural integrity of the assembly. Also, as explained below, the assembly employing the aspects disclosed herein adjusts for various changes due to temperature changes.

(12) FIGS. 4(a)-(e) illustrate a method for providing a lens assembly according to the aspects disclosed herein. Referring to FIGS. 4(a)-(e), the lens assembly shown may be implemented in the various contexts disclosed herein.

(13) In FIG. 4(a), a framing layer 400 is provided. The framing layer 400 may be any sort of solid substance employed to provide a support for a lens 430 shown below. The framing layer 400 may be built into a center stack area of a vehicle.

(14) In FIG. 4(b), the framing layer 400 is modified to provide a tapered edge as shown. Thus, the framing layer 400 produces two profiled surfaces 411. Each surface 411 is provided with an angle less than 90 degrees. The pieces 410 and 420 may form the bezel of lens assembly. It will be noted that pieces 410 and 420 are not separate pieces, but rather a cross sectional view of a panel with a beveled surfaces. The pieces 410 and 420 are shown as separate elements for explanatory purposes.

(15) In FIG. 4(c), a lens 430 is provided. The lens 430 may be any sort of covering employed in an electronic display. The lens 430 is transparent, or semi-transparent and allows the passage of light to go through and convey information.

(16) In FIG. 4(d), the lens 430 is manipulated or machined to look like the lens 440 shown. Thus, the lens 440 is provided within a space or gap in between pieces 410 and 420. The angle 441 is greater than 90 degrees, an allows for placement in between the pieces 410 and 420. As shown, there is a gap provided 442 and 443 in between the various elements.

(17) In FIG. 4(e), an elastic adhesive 450 is placed in the gaps 442 and 443. The adhesive 450 may allow attachment between the pieces 410 and 420 and the lens 440. Further, the adhesive is moveable and allows the lens 440 to move back and forth while still maintaining attachment of the pieces 410 and 420.

(18) The elastomeric adhesive 450 may be chosen with a Young's elastic modulus ranging from between 0.1 through 10 Mpa but with practical example range of 0.2 to 2 Mpa although the adhesive may not act elastically under all conditions. Accordingly, the adhesive 450 is capable of being moved/deformed; however, this movement is predefined under a specific amount within the elongation to breakage limits of the chosen adhesive.

(19) FIG. 5 illustrates an example of the lens assembly shown in FIGS. 4(a)-(e) with various parameters employed for sizing. As shown, dimensions 460, 470, 480, and 490 are illustrated. These dimensions represent various portions of the assembly that may be sized to provide different properties (based on predefined determinations). The implementer of the lens assembly may size the various dimensions based on a desired dimension, or likelihood to satisfy various stress and strain conditions.

(20) For example, dimension 460 (flush lens distance) may be improved upon from the examples shown in the Background; fixturing of lens to frame during adhesive bonding is one method for achieving flush design without mechanical stackup constraints. Further, the bevel angle 495 can be set or predefined based on defined angle sizes for various thickness employed, and the dimensions described above.

(21) As explained in FIGS. 6(a)-(c), the adhesive layer 450 expands and contracts based on the differential thermal coefficient of expansion (TCE) of frame and lens components, temperature range desired and size of the lens. The dimension 490 may be set accordingly to compensate for various TCE. Further, the bevel angle 495 may also be set to address TCE.

(22) Further, the dimension 490 can be aesthetically improved compared to an air gap by dispensing an appropriate color of adhesive that can fill the air gap. Further, the adhesive 450 may be jigged during assembly, and thus provide a refined adhesive joint appearance of the front surface towards the viewer. This may occur by forming the adhesive into a uniform geometric shape (i.e. concave radius, recess groove, and the like) via an assembly jig tool that generates a joint shape, while sealing off any unwanted adhesive dispensed past the front joint.

(23) The dimensions 470 and 480 may be sized relatively smaller than those shown in the Background. Essentially, the width and thickness for a bezel portion of the lens assembly may be smaller. Accordingly, more packaging space may be employed for touch sensors and other electrical componentry provided along with a lens assembly. Additionally, the distance from the lens to display may be reduced compared to FIG. 2; this is important for certain lens with antiglare surfaces that degrade the quality of the image with increasing distance between lens and display.

(24) FIGS. 6(a), (b) and (c) illustrate an example of the lens assembly undergoing various environmental conditions. In the various examples shown, the lens assembly is provided in different temperatures and environments. In FIG. 6(b), the lens assembly is in a relatively normal temperature, and the various elements shown are of a normal size.

(25) In FIG. 6(c), the lens assembly is shown in a relatively hotter temperature from FIG. 6(b). Thus, pieces 410 and 420 expand more than lens 440 expands due to the thermal effects caused by the temperature. The adhesive 450 expands and maintains the lens assembly's general shape and contours.

(26) In FIG. 6(a), the opposite effect of that shown in FIG. 6(c) is shown. Thus, a colder temperature causes the lens assembly pieces 410 and 420 to shrink relative to lens 440. In this case, leverage provided by the angled surfaces exert force on the adhesive 450 and the lens moves out of plane to relieve stress on frame 410 & lens 440 edges.

(27) FIG. 7 illustrates another advantage of the lens assembly disclosed herein for meeting automotive head impact safety regulations. This is important in the case of an impact of significant force, such as during simulated head impact testing, where energy absorption and management of that energy is critical. As shown, the lens assembly undergoes contact via an object 700, with a force/direction 710. The lens assembly shown in FIG. 7 moves accordingly in direction 720. This permits increased safety through three techniques:

(28) Technique 1: Shock damping of object 440 is achieved via viscoelastic deformation of item 450. It is not necessary for item 450 to stay within an elastic limit to be useful to pass the impact test; rather it merely needs to keep general retention of object 440 to object 410.

(29) Technique 2: Deformation in direction 720 relieves stress on object 440 compared to FIG. 2 and FIG. 3 where object 110 and object 310 are physically constrained by object 220 and object 320, respectively.

(30) Technique 3: Generally speaking, the weakest portion of glass lens object 440 tends to be where manufacturing defect flaws appear at object 440's edge. Object 450 acts to seal and limit breakage deformation at object 440 edges if breakage were to occur.

(31) Thus, employing the structural elements shown in FIG. 7, the lens assembly may effectively undergo stresses and maintain structural integrity.

(32) FIG. 7 illustrates an additional utility function of object 450, namely sealing to prevent contamination of internal objects such as the display that would impair visibility of the display from dust ingress or electrical shorting of sensitive components from liquids ingress that could occur from customer spills or rain entry in the case of accidental open sunroofs or convertible tops.

(33) It will be apparent to those skilled in the art that various modifications and variation can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.