JP2002207105A - Optical element, display element and display device each with the optical element, and image pickup element and image pickup device each with the optical element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical element which reduces the cost of a UV cutting filter, reduces the number of components and can save space and to provide a display element and a display device each with the optical element and an image pickup element and an image pickup device each with the optical element. SOLUTION: A multilayer film having UV cutting performance or a multilayer film having UV cutting performance and antireflection characteristics in the visible region is disposed on the light incident side of a substrate with an optical element disposed on one side opposite to the light incident side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical element, a display element and a display device having the optical element, and an image sensor and an image pickup device having the optical element.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal projector device using a microlens array optical element has been disclosed in Japanese Patent Application Laid-Open No.
As disclosed in Japanese Unexamined Patent Publication No. 3 (1994) -1995, an ultraviolet cut (hereinafter, referred to as UV cut) filter is arranged after a white light source to remove ultraviolet light. In addition, the lens portion, which is a component of the microlens array optical element, and the adhesive layer for flattening are often made of an ultraviolet curable resin.

[0003]

However, in the above conventional example, the size of the UV cut filter is large because the UV cut filter is arranged before the white light source.
In order to produce a product with good uniformity of spectral characteristics, there are problems such as an increase in cost, an increase in the number of parts, and a hindrance to downsizing of the projector device due to wasted space. Was.

Therefore, the present invention solves the above-mentioned problems, and
Provided are an optical element, a display element and a display device having the optical element, and an imaging element and an imaging device having the optical element, which can reduce the cost of the cut filter, reduce the number of components, and reduce the space. Is what you do.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an optical element having the following constitutions (1) to (11), a display element having the optical element, and a display device.
And an image pickup device and an image pickup device having the optical element. (1) An optical element characterized in that a multilayer film having an ultraviolet cut performance is arranged on the incident light side, which is the other side of the substrate on which the optical element is arranged. (2) The optical element according to the above (1), wherein the multilayer film has an ultraviolet cut performance of a transmittance of 5% or less at a wavelength of 370 nm or less. (3) An optical element characterized in that a multilayer film having ultraviolet cut performance and antireflection characteristics in the visible region is disposed on the incident light side, which is the other side of the substrate on which the optical element is disposed. (4) The multilayer film has an ultraviolet cut performance of a light transmittance of 5% or less at a wavelength of 370 nm or less, and has an antireflection characteristic in a visible region having a reflectance of 1 at a visible wavelength of 400 nm to 700 nm. % Or less, the optical element as described in (3) above. (5) The optical element according to the above (3) or (4), wherein the multilayer film is made of two or more kinds of film materials of an oxide and a fluoride. (6) The optical element according to any one of (1) to (5), wherein the optical element is a microlens array. (7) The optical element according to (6), wherein the microlens array is formed of an ultraviolet curable resin material. (8) A display element comprising the optical element according to any one of (1) to (7). (9) A display device comprising the display element according to (8). (10) An image sensor comprising the optical element according to any one of (1) to (7). (11) An imaging device comprising the imaging device according to (10).

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In an embodiment of the present invention,
By forming a UV cut or a UV cut and visible reflection preventing layer on the surface of the optical element forming substrate on the incident light side, the cost of the UV cut filter can be reduced, and parts such as a liquid crystal printer can be used as a display device. It is possible to reduce the number of points and reduce the size by saving space.

[0007]

Embodiments of the present invention will be described below.
FIG. 1 is a diagram illustrating a configuration of a microlens array component for a liquid crystal projector according to an embodiment of the present invention. In the figure, reference numeral 10 denotes a glass substrate forming a microlens array, 40 denotes a glass substrate for flattening the liquid crystal side, 30 denotes a microlens, 20 denotes an adhesive layer, and 50 denotes UV.
It is a multilayer film that also serves as cut and antireflection in the visible region. Here, the surface on the incident light side of the substrate on which the microlens array is formed has a UV cut performance of reducing the transmittance of light having a wavelength of 370 nm or less to 5% or less, and a reflectance of 1 at a wavelength in the visible region from 400 nm to 700 nm. % Was formed. As a result, it is possible to cut harmful ultraviolet light as light of the liquid crystal projector and to realize high luminance.

Hereinafter, a method for manufacturing the microlens array component of the present embodiment will be described with reference to FIG. 1 showing the configuration of the microlens array component for a liquid crystal projector. First, a multilayer film 50 having a UV-cut and antireflection spectral characteristic in the visible region was formed on the low-expansion glass substrate 10 on the light incident side of the light source by vacuum evaporation or sputtering film formation. Next, an adhesive layer 20 having a low refractive index is formed using a Ni electroforming mold (not shown) for replica molding of a convex lens shape.
In order to form 0, a high-refractive-index resin material is dropped on the adhesive layer 20 whose formation is stabilized, and the liquid crystal side glass substrate 40 is placed and cured with a predetermined gap accuracy. Thereafter, the liquid crystal side substrate is polished to a predetermined thickness by optical polishing to complete the manufacture of the microlens array component.

[0009]

As described above, according to the present invention,
By forming a UV cut or a UV cut and antireflection layer in the visible region on the surface on the incident light side of the optical element forming substrate, the cost of the UV cut filter can be reduced, and the number of components in the display device can be reduced and the space can be saved. It is possible to reduce the size.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a microlens array component according to an embodiment of the present invention.

[Explanation of symbols]

 10: Glass substrate 20: Adhesive layer 30: Micro lens 40: Liquid crystal side glass substrate 50: UV cut anti-reflection layer

Claims (11)

[Claims] 1. An optical element, wherein a multilayer film having an ultraviolet cut performance is disposed on an incident light side, which is another side of a substrate on which the optical element is disposed. 2. The ultraviolet light blocking performance of the multilayer film is 370.
The optical element according to claim 1, wherein a transmittance at a wavelength of nm or less is 5% or less. 3. An optical element characterized in that a multilayer film having ultraviolet cut performance and antireflection characteristics in the visible region is disposed on the incident light side, which is the other side of the substrate on which the optical element is disposed. 4. The multilayer film has an ultraviolet cut performance of 370.
4. The light transmittance at a wavelength of not more than 5 nm is 5% or less, and the antireflection characteristic in the visible region has a reflectivity of 1% or less at a wavelength in the visible region from 400 nm to 700 nm. An optical element according to item 1. 5. The optical element according to claim 3, wherein said multilayer film is made of two or more kinds of film materials of an oxide and a fluoride. 6. The optical element according to claim 1, wherein said optical element is a microlens array. 7. The microlens array according to claim 6, wherein said microlens array is formed of an ultraviolet curable resin material.
An optical element according to item 1. 8. A display device comprising the optical element according to claim 1. 9. A display device comprising the display element according to claim 8. 10. An image sensor comprising the optical element according to claim 1. 11. An image pickup device comprising the image pickup device according to claim 10.