CN218412952U - TIR lens for FPD detection and lighting module - Google Patents

Abstract

The utility model discloses a TIR lens and lighting module for FPD detection, the TIR lens comprises a first incident surface, a second incident surface, a total reflection surface, an emergent surface, a rear end surface and an outer ring surface; the first incident surface and the exit surface form a central light path, the second incident surface, the total reflection surface and the exit surface form a peripheral light path, the rear end surface is connected with the second incident surface and the total reflection surface, and the outer ring surface is connected with the exit surface and the total reflection surface. The utility model discloses can converge light in a bit, provide the hi-lite illumination.

Description

TIR lens for FPD detection and lighting module

Technical Field

The utility model discloses a TIR lens is especially applied to FPD detection area.

Background

Currently, in the field of FPD (Flat Panel Display) substrate detection, the detection accuracy has reached the micron level, the exposure time reaches the microsecond level, and the requirement for illumination intensity is very strong. Especially in dark field illumination, because the dark field shields reflected light and only receives scattered light of characteristic points, the requirement on illumination intensity is dozens of times of that of bright field illumination. Currently, the illumination intensity is one of the important factors restricting the increase of the detection speed of the FPD.

In order to meet the requirement of high-precision detection, optical systems used for FPD detection have large NA angles and small working distance. Accordingly, the space between the object to be detected and the optical system is limited, and the arrangement of the light sources is greatly limited. Therefore, FPD inspection illumination light source development is starting from increasing the light energy density in a unit spatial solid angle.

The Total Internal Reflection (TIR) lens adopts a total reflection principle, collects and processes light rays, has the light energy utilization rate of over 95 percent, and is applied to the fields of searchlights, flashlights, landscape lighting and the like. However, the emergent light of the existing TIR lens is parallel light or diffused light, which is long-distance surface illumination, and the technical key point is optimization of illumination uniformity and dispersion characteristic of an illumination surface, but in the field of micro-distance microscopic illumination, illumination light needs to be converged at one point to provide high-brightness illumination, which is not possessed by the existing TIR lens.

SUMMERY OF THE UTILITY MODEL

The purpose of the utility model is realized through following technical scheme.

In order to overcome the problems of the prior art, the utility model provides a TIR lens and light source module for microspur target illumination.

The utility model provides a microspur target illumination light source module based on TIR lens includes:

a high power LED light source;

the TIR lens comprises a first incident surface, a second incident surface, a total reflection surface, an exit surface, a rear end surface and an outer ring surface;

the first incident surface and the exit surface form a central light path, the second incident surface, the total reflection surface and the exit surface form a peripheral light path, the rear end surface is connected with the second incident surface and the total reflection surface, and the outer ring surface is connected with the exit surface and the total reflection surface.

Further, the first incidence surface is a quadratic aspheric surface.

Further, the equation of the curved surface of the quadratic aspheric surface is

Wherein C =0.5556, k = -2.19.

Further, the second incident surface is a cylindrical surface.

Further, the rear end face is perpendicular to the optical axis.

Further, the total reflection surface is a cubic aspheric surface.

Further, the surface equation of the cubic aspheric surface is y = -0.0095x ³ + 0.1393x ² + 1.3815x - 0.0002。

Furthermore, the emergent surface is a quadratic aspheric surface, and the curved surface equation is

Wherein C =0.0406, k = -2.268.

Further, an axis of the outer annular surface coincides with the optical axis.

The utility model has the advantages of: the utility model provides a TIR lens and light source module for microspur target illumination can converge light in a bit, provides the hi-lite illumination.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 shows a TIR lens cross-sectional profile in accordance with an embodiment of the present invention;

fig. 2 shows a schematic diagram of a TIR lens light path according to an embodiment of the present invention;

fig. 3 is a schematic view illustrating an illumination mode of the light source module according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

FIG. 1 is a cross-sectional profile view of a TIR lens. The TIR lens module comprises a first incident surface 101, a second incident surface 102, a total reflection surface 103, an emergent surface 104, a rear end surface 105, an outer ring surface 106 and an LED 107;

the first incident surface and the emergent surface form a central light path, and the central light of the LED sequentially passes through the first incident surface and the emergent surface and then is converged on the illumination surface.

The second incident surface, the total reflection surface and the exit surface form a peripheral light path, and the peripheral light of the LED sequentially passes through the second incident surface, the total reflection surface and the exit surface and then is converged on the illumination surface.

The first incidence surface is a secondary aspheric surface and is responsible for converging light in the middle of the light source into parallel light.

The second incident surface is a cylindrical surface.

The rear end face is perpendicular to the optical axis and is connected with the second incident face and the total reflection face.

The total reflection surface is a three-time aspheric surface and is responsible for converging light at the peripheral part of the light source into parallel light.

The emergent surface is a quadratic aspheric surface and is responsible for converging the emergent parallel light of the first incident surface and the total reflection surface to the illumination surface.

The axis of the outer annular surface is coincident with the optical axis and is connected with the total reflection surface and the emergent surface.

In this embodiment, the center of the torus 105 is taken as the origin of coordinates, and the optical axis is taken as the x-axis.

In this embodiment, the first incident surface 101 is a quadratic aspheric surface having a curved surface equation of

Wherein C =0.5556, k = -2.19.

In this embodiment, the second incident surface 102 is a cylindrical surface with a radius of 2mm.

In this embodiment, the total reflection surface 103 is a cubic aspheric surface, and the curved surface equation is y = -0.0095x ³ + 0.1393x ² + 1.3815x - 0.0002。

In this embodiment, the exit surface 104 has a quadratic aspheric surface with a curved surface equation of

Wherein C =0.0406, k = -2.268.

The center of the luminous surface of the LED is positioned on the optical axis of the TIR lens. The closer the LED is located to the rear face 105, the greater the angle of light that can be collected, but the larger the corresponding TIR lens diameter. The spatial distribution of the emitted light of an LED is generally lambertian, and the higher the angle, the lower the luminance of the emitted light. In the field of FPD illumination, higher brightness (illuminance per unit solid angle of space) is pursued due to space limitations. An excessively large TIR lens diameter may, in turn, reduce the number of lighting modules that can be arranged in a limited space, thereby reducing the overall illuminance. There is a balance between the percentage of light energy collected by a single lighting module and the number of lighting modules that can be arranged.

The utility model discloses in, LED light emitting area is 1mm apart from rear end face 105 distance, rear end face inner ring diameter 4mm, outer loop diameter 5.2mm.

FIG. 2 is a schematic diagram of a TIR lens converging light path. The illuminated spot is 60mm from the origin of coordinates in the figure.

FIG. 3 is a schematic view of an illumination mode of the light source module. The TIR lenses are arranged in an array, and are symmetrically arranged above the object plane and outside the imaging optical system in a surrounding manner.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A TIR lens for FPD detection,

the TIR lens comprises a first incident surface, a second incident surface, a total reflection surface, an exit surface, a rear end surface and an outer ring surface;

the first incident surface and the exit surface form a central light path, the second incident surface, the total reflection surface and the exit surface form a peripheral light path, the rear end surface is connected with the second incident surface and the total reflection surface, and the outer ring surface is connected with the exit surface and the total reflection surface.

2. The TIR lens for FPD detection according to claim 1,

the first incidence surface is a quadratic aspheric surface.

3. The TIR lens for FPD detection according to claim 2,

the equation of the curved surface of the quadratic aspheric surface is

Wherein C =0.5556, k = -2.19.

4. The TIR lens for FPD detection according to claim 1,

the second incident surface is a cylindrical surface.

5. The TIR lens for FPD detection according to claim 1,

the rear end face is perpendicular to the optical axis.

6. The TIR lens for FPD detection according to claim 1,

the total reflection surface is a cubic aspheric surface.

7. The TIR lens for FPD detection according to claim 6,

the surface equation of the cubic aspheric surface is y = -0.0095x ³ + 0.1393x ² + 1.3815x - 0.0002。

8. The TIR lens for FPD detection according to claim 1,

the emergent surface is a quadratic aspheric surface with a curved surface equation of

Wherein C =0.0406, k = -2.268.

9. The TIR lens for FPD detection according to claim 1,

the axis of the outer annular surface coincides with the optical axis.

10. A lighting module, comprising:

a high power LED light source;

the TIR lens for FPD detection as defined in any one of claims 1-9.

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